1 Impingement corrosion is a A. Physical action B. CHEMICAL action C. Physical and chemical action D. None of the above (majority) 2.It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the the most probable probable cause? (sure ans c) A. There is leakage in the bilge suction pipeline somewhere somewhere between the bilge wells and bilge pump B. The Fwd. (P) bilge well suction valve might be leaking C. The Fwd. (P) bilge well suction filter cover gasket might be leaking D. The pump needs to be overhauled 3. Which of the following is NOT a correct point for sampling of system lube oil for on board or shore analysis? (Sure ans) A. Standpipes B. Purifier outlets C. Inlet or outlet of L. O. coolers D. Tank drains 4. The ballast valve of the fore peak tank is located in the duct keel and cannot be opened or shut by remote operation. The valves of other tanks can be operated remotely remotely without any trouble which of the following will be the best practice? (sure ans) A. Valve should be checked locally for troubleshooting troubleshooting without which it is difficult to find the exact problem B. The actuator must be defective and should be replaced with a new one C. The control circuit is defective and the PCB should be replaced D. Shore assistance will be required in such cases 5. Pump Start But Motor gets overloaded or Trip on overload. ( multiple answer) A. Alignment is wrong B. Gland packing too tight C. Worn out / Damaged ball bearing D. Cavitation exists (majority) 6. The most important control measure to prevent boiler tube failure is: A. Use of proper refractory material B. Proper maintenance of fuel burning equipment C. Proper maintenance of boiler water condition D. All of the above (fb majority with c)
7. During flooding of a dry dock the following items must be verified (fb majority) A. All sea valves are operational B. All overboard discharge valves are operational C. Stern tube seal are operational D. All of the above 8. When running TWO centrifugal Pumps in parallel, Flow rate "Q" is increased. (sure ans) A. TRUE B. False C. May Be D. I Don't know 9. In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel? A. Spalling B. Cracking C. Shrinkage cracking D. Slagging ( slagging means softening. These salts react with refractory to form molten slag. Reduces thickness of refractoryrefractory- given in Flanagan.Fb majority.) 10. Normally Normally so called single screw pumps are used as sludge pumps in engine room. What is the correct technical name of these pumps? A. Snake Pump B. Screw Pump C. Progressive cavity pump D. Gerotor Pump 11.NPSH and the Total suction head are two terms which are commonly used for pumps. Which of the following is a true statement? A. They are one and the same thing B. Total suction head is greater than NPSH C. NPSH is always greater than Total suction head D. Total suction head and NPSH have no relationship (fb majority.sure. Total Total Suction Head: It is vertical distance from the center line of the pump to free level of the liquid to be pumped minus, all friction looses in suction pipe and fitting plus any pressure head existing on the suction supply. Net positive suction Head [NPSH]: It is the total suction head minus the vapor pressure of water at the pumping temperature both expressed in meter) 12. Which of the following V/V cannot be overhauled in place without removing piping? A) Ball Valve (B) Diaphragm valve C) Globe valve (D) Butterfly valve (majority with d)
13. Copper tubing is used in refrigerant system because A) It has less internal resistance B) It is cheaper compared to other materials. C) It is easier to check leaks in copper based system D)None of the above (majority bt no reference.) 14 When pressure inside a system falls below that of the vapour pressure of the liquid Cavities r formed, cavities travelling to high pressure region collapses releasing Considerable Considerable energy damage the metal surface which is known as A) Cavitation B) Erosion B) Impingment Corrosion D) Cavitation Erosion (majority.) 15. While refloating the vessel after dry docking which of the following check should be Carried out A) Sounding of all double bottom tanks B) Checking leakages in the stern tube header tks C) Checking leakages of shipside valves D) Checking level of stern tube, header tanks (majority) 16. Why should only approved toilet cleaning chemicals be used in A) Unapproved chemicals can lead to corrosion in the system B) unapproved chemicals can lead to toxic conditions in the system leading C) To destruction of protective coatings D) Unapproved chemicals can kill aerobic bacteria making the plant ineffective Gases produced by use of unapproved chemicals can pose threat to the operators 17) After over hauling reciprocal pump the motor connections were wrongly given. Determine outcome outcome when pump is started?(Sure ans wid majority) A) The direction of flow wl remain unaffected B) the direction of flow wl b reversed C) The pump wl get damaged because the suction valve wl block the reverse flow causing overpressure leading to pump breakdown. D) The pump wl lose suction N there wl b no flow. 18) Pump driven type clutch attached to vacuum pump r commonly used for 18) priming ballast pump n emergency fir pump. What is the factor which clutches the vacuum pump to pump the clutch during start of the pump. A) Low suction pressure acting against the spring loaded clutching piston
B) High suction pressure actiong against the spring loaded clutching piston C) Low discharge pressure acting against the spring loaded clutching piston D) High discharge pressure acting against the spring loaded clutching piston (primer clutches on low pr and declutches on high pr. Majority ans also.) 19) U R responsible for daily transfers of engine room bilges . U follow the 19) sequences aft –fwd (P)-fwd(s) bilgewel n u hv never experienced a problem but 5/E started the transfer n first transferred forward (s) bilgewel n without any problem n u join him later u find that bilge pump is not taking suction fr f(p) n aft bilgewel n then u hv checked everything is normal. what is the cause. A) 5th engineer made a mistake by 1st transferring the fwd (s) bilge wel, normal sequence of operation for engine room machinaries should not b disturbed. B) fwd (s) Bilge wel suction valve is leaking C) Bilge pump suction filter cover gasket is leaking. D) Fwd (s) Bilgewel suction filter cover gasket is leaking. (Sure ans and majority.) 20. A thin layer of electrolyte trapped in a small pits on a metal surface , and remaining stagnant over a period of time , may cause : A. Erosion B. Bimetallic corrosion corrosion C. Crevice corrosion D. Corrosion fatigue (Majority) 21. The purpose of an evaporator in the domestic refrigeration system is to A. Transmit latent heat of evaporation B. Absorb latent heat of fusion C. Absorb latent heat of evaporation D. Transmit latent heat of fusion (sure ans. ajority also.) 22. In case of tankers, the speed of cargo pumps is reduced while stripping, why? A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced C. To prevent the pump from over speeding if it loses suction D. Decreasing the speed increases the discharge discharge head of the pump which is required to pump out the remaining cargo 23. Which of the following statements is False about cleanliness of electric motors?
A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor. C. High-pressure dry compressed air cleaning is preferred preferred over suction cleaning for stator windings. D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them. 24. The attached vacuum pump of a ballast pump operates on the principle of a: A. Centrifugal pump B. Reciprocating pump C. Gear Pump D. Vane Pump 25. Increasing the rotational rotational speed of a cargo pump the pump flow rate will: A. Increase in direct proportion to the increase in speed B. Decrease in direct proportion to the increase in speed C. Flow rate doesn't depend upon speed D. Flow 26. Vacuum priming pumps which work on the principle of fixed vane pumps require _____________ for___________ clearance between vane tips and casing. A. Lube oil, lubricating B. Lube oil, sealing C. Water, sealing D. Gland packing, sealing 27. Which one of the following is a type of corrosion :A. Electroplating B. Galvanisation Galvanisation C. Graphitisation D. Demulsification (Graphatisation (Graphatisation as given in mcgeorge. Galvanizatn is the process of applying a metal coating. Sure ans c.) 28. The main disadvantages of a reciprocating pump over a Gear pump is that: A. A gear pump is self priming while a reciprocating pump is not B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed C. The discharge of reciprocating pump is pulsating and discharge rate is lesser D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used 29. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will A. increase B. decrease
C. Will not be affected as the pump power depends only on the flow capacity D. None of the above • As long as the viscosity of a liquid is similar to that of water, its specific gravity will have no effect on pump performance. It will, however, directly affect the input power required to pump that particular liquid. The equation below can be used to compute the horsepower required to pump liquids of varying specific gravities (where BHP is brake horsepower, Q is flow in GPM, H is head in feet, SG is specific gravity and Eff is the hydraulic efficiency of the pump). It assumes a viscosity similar to that of water. BHP = (Q x H x SG) / (3960 x Eff) • Pump power will decrease. Power consumption will increase. 30)shaft sealing of a main sea water pump for ship plying in coastal muddy waters, which is the best option A. Gland packing B. Lip seal with garter spring C. Mechanical seal D. Cup seal (Fb majority with A. no reference.) (mechanical seal is not efficient in muddy waters as given in mcgeorge. It cud b A becos gland packing has water piping arrangement. 31. When one of the M/E.F.O. heater is not in use then A) The F.O. inlet n outlet valve should b kept shut, but steam heating valves should b kept crack open so as to keep the heater warm. B) F.O. inlet n outlet valve should b kept shut n heating valves also should b completely shut n should b drained of any remaining F.O. c) F.O. inlet n outlet valve should b kept crack open so that the F.O. recirculation can take place. d) F.O. inlet n outlet valve should b kept shut while outlet valve should be left open so that (Sure) 32)removable sleeves on centrifugal pump shaft: a) make easier to replace pump shaft packing b) they can be economically replaced as they wear out c) to lighten weight of pump d)increase strength of shaft 33)A recently completely overhauled Engine room bilge pump was working efficiently. Suddenly one day you find that the pump is not taking suction. You have tried priming with sea waterbut still the pump doesn???t take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative. A. The bucket rings have worn out B. The suction or discharge valve must have worn out and started leaking
C. The suction or discharge valve might be stuck in one position or some debris mighthave lodged itself in between the valve and the seat D. Pump suction filter might be clogged (not sure abt the ans . confusion on fb. I think d is right ans. As filter is clogged, sea water vv when opened, pressurized flow will pass through it bt wen sucking from bilge tk or bilge well it wil loose suction easily.) 34)air compressor cooler tube type a)spring tube b)floating tube c)fix tube d)u tube 35)Which of the following option gives you the correct sequence of the metals/alloys in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte? A. Stainless Steel , Naval Brass , Aluminium bronze , Copper B. AluminiumBronze ,Cupro-Nickel , Monel metal , Titanium C. Stainless Steel ,Cupro-Nickel ,Naval Brassl , Monel Metal D. Stainless Steel , Copper, Naval Brass , Aluminium bronze (Sure. Majority on fb) 36)Which of the following option gives you the correct sequence of the metals in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte ? A.Titanium, Mild Steel , Zinc , Stainless steel B.Titanium , Stainless steel ,Mild Steel ,Zinc C.Zinc , Mild Steel , Stainless steel , Titanium D.Zinc , Titanium , Mild Steel , Stainless steel; (sure ans.) 37)A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing? A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat (Samant sir ans a. And b fb majorityplus ans tld by a g nair sir.) 38)aluminium being lower than zinc in galvanic series provides lesser protection to steel compared to the zinc coating . which one of the following is a true statement :
a. aluminium coating provides good corrosion protection compared that of zinc at elevated temperatures b. zinc is always preferred over aluminium coating irrespective of the temperature of metal surface c. aluminium is never used as coating material d. aluminium reacts with steel , so cannot be used for coating steel (majority on fb with a. c and d are sure not the ans. Confusion bet a and bThe film that forms on the surface of zinc is not as protective as the aluminum oxide film on the surface of aluminum-based coatings. One reason is that zinc oxide/carbonate is susceptible to dissolution if the moisture is sufficiently acidic. This is good and bad. It is good in that, if the oxide film were totally protective, the zinc would no longer offer galvanic protection to the steel at exposed areas. Rusting would therefore occur at scratches and other exposed areas. The downside of the somewhat incomplete protection of the oxide film on a galvanized sheet is that the coating does corrode and is eventually consumed. In the case of aluminum, the oxide is such a good barrier that the metal, while close to zinc in the galvanic series, offers little galvanic protection to iron in most atmospheric environments.) 39)The lower half of main bearing of a very large diesel engine can be removed by: A. Pulling out with a chain block B. By hammering out with the help of a soft mallet C. By slightly jacking the crankshaft and turning out the bearing half with a rope or similar tackle provided. D. By using a special tool in the oil hole and turning the shaft to turn out the lower half. (sure) 40)pl answer the following question. Purifier leaking bowl opened, cleaned n seal ring changed n putback bt still leaking wat might b wrong a. high temp b. high density c. disc size nt proper d. rpm low (b and c cant b the ans as bowl is leaking.. not overflowing. So consider d. rpm low thus closing wat pr low as water paring disc is not rotating at desired speed. So bowl not closing completely hence leaking.) 41. Surface preparation of steel surfaces, prior carrying out painting isimportant because (choose the best alternative): A. Any rust and contaminant inclusions may cause local paint film breakdown B. Too much paint will be consumed if surface preparation is not carried out C. Surface will be very rough if proper surface preparation is not carried out
D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes strong bonding 42. Accelerated corrosion due to removal of protective surface films (e.g.) oxide layers on metal/alloy surfaces due to turbulence of working fluid is known as a) Bimetallic corrosion b) Impingement corrosion c) Cavitation erosion d) Selective phase corrosion (As per mcgeorge pg 14.And most of the people.Bt check pg 114 also.) 43.which of the following is NOT a true statement? a. butterfly valves are used modulating flow and can be throttled. b. globe valve can be straight flow or angle flow type. c. swing check valve will provide lesser resistance than same bore dia globe type check valve. d. in a globe type valve mechanical seals are used for providing the sealing between spindle. (c majority) 44)In shell and plate type coolers, due to improper flow design or partial blockage of tubes may lead to high turbulence locally. This condition may lead to (choose the best alternatives): A. Bimetallic corrosion B. Selective phase corrosion C. Erosion D. Impingement corrosion (multi then c n d. single choice c) 45) You have overhauled a centrifugal pump and while assembling forgot to install the o-ring between the sleeve (provided in way of gland packing) and the shaft. What impact does this have? A. It will not affect the pump in any way B. It will cause leakage of fluid(air/water) in between the shaft and the sleeve and will affect the pump performance C. It will not affect the pump performance n any way but will corrode the shaft between the o-ring and shaft D. It will cause dynamic imbalance of the shaft 46)Which of the following is a true statement ? (choose more than one option if true) A. Mild steel will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte B. Stainless steel will be subject to preferential corrosion when in electrical continuity with Mild steel in presence of an electrolyte C. Copper will be subject to preferential corrosion when in electrical continuity with Mild steel in presence of an electrolyte
D. Zinc will be subject to preferential corrosion when in electrical continuity with Aluminium in presence of an electrolyte 47)boiler pp operate at an elevated temp and pressure. The ideal materials for the pp casing and impeller shud b A gunmetal casing, al bronze impeller B high gade CI casing, bronze impeller C cast steel casing, SS impeller D cast steel casing, al bronze impeller. (sure ans. Frm mcgeorge.) 48)direction of rotation of centrifugal pump is reversed by changing the motor connections a. pump will deliver the liquid in reverse direction b. pump discharge and capacity will be affected c. efficiency will decrease d.casing get overheated (b if single chc. B n c if multiple..frm fbwww.crazyengineers.com/threads/reverse-rotation-of-the-centrifugal-pumpimpeller-effect.31453/)
49)screw pump is generally are ??????????????? pump a. slow speed b. high speed c. medium speed d. all of the above (Sure ans mcgeorge pg 168) 50)the gland packing of centrifugal pump a) should not allow any breakage under the suction pressure. b) should only allow drop by drop continuous leakage under positive suction pressure. c) should only allow drop by drop continual leakage under positive suction pressure. d) should allow considerable leakage (Fb majority) 51)Salinity of distilled water produced from fresh water generator onboard depends on A. Amount of feed set in fresh water production B. Amount of salt water leaking from condenser if any C.Temperature of the sea water used D. Efficiency of brine ejector from the evaporator shell ( majority
52.In- water survey in lieu of a one of the two docking surveys in a 5-year period may be accepted wheIn- water survey in lieu of a one of the two docking surveys in a 5-year period may be accepted when: A. A suitable high resistance paint is applied to the ship???s underwater hull B. The ship is less than 15 years old C. The in-water survey provides all the information required by classification society D. A part of the ship is on fire (http://www.facebook.com/l.php?u=http%3A%2F%2Fbooks.google.co.in %2Fbooks%3Fid%3De_D8Di9xCXYC%26pg%3DRA3-PA137%26lpg%3DRA3PA137%26dq%3Din%2Bwater%2Bsurvey%2Bexemptions%26source%3Dbl %26ots%3DE7Pn4oKOPf%26sig%3DM7HiuNoPjF8-S8el7ieYHBJ19CA%26hl%3Den %26sa%3DX%26ei%3Dgx4yUc_-DJHyrQfr34GIAQ%26ved%3D0CD8Q6AEwAw %23v%3Donepage%26q%3Din%2520water%2520survey%2520exemptions%26f %3Dfalse&h=sAQEE01W-) (I think its not mep q.) 53). Corrosion protection of steel surfaces by zinc coating can be carried out only at temperatures below 65 deg. C. For higher temperatures.. a) Zinc reacts very fast and thus can only provide protection for a limited time b) Zinc reacts with steel and protective layer vanishes due to chemical reaction c) Steel may corrode preferentially to the zinc d) Dezincification occurs leading to removal of zinc coating (Reference http://www.ingal.com.au/FAQ/faq24.html written clearly here that reversal of polarity takes pace at temp more than 70 deg.)
54)You have valves of same bore diameter but of different types.Which of the following is arranged in the decreasing order closing torque required for giving a perfect seal? A. Globe valve, Ball valve, Butterfly valve(rubber seat) B. Ball valve, Globe valve, Butterfly valve(rubber seat) C. Butterfly valve(rubber seat), Globe valve, Ball valve D. Globe valve, Butterfly valve(rubber seat), Ball Valve (lot of confusion) 55)After cleaning the M/E F.O. heater you have assembled the heater and want to try out the heater before putting into use. Which is the correct sequence of operation of the valves? A. (1) Vent valve open (2) F.O. inlet valve crack open (3) When F.O. starts coming out of vent line close vent (4) F.O. inlet valve full open (5) F.O. outlet valve full open (6) Steam return and inlet valves slowly opened up
B. (1) Vent valve open (2) F.O. outlet valve crack open (3) When F.O. starts coming out of vent line close vent (4) F.O. outlet valve full open (5) F.O. inlet valve full open (6) Steam valves slowly return and inlet opened up C. (1) F.O. outlet valve crack open (2) F.O. inlet valve crack open (3) As the pressure gauge shows pressure open steam heating valves slowly (4) Fully open F.O. inlet and outlet valves D. (1) Open steam retur Confusion between a and b 56)Cadmium coatings provide corrosion protection . Cadmium coatings are commercially carried out using which of the following methods :A. Metal Spraying B. Electro-plating C. Hot-dipping D. Metal diffusion (sure) 57.WHICH PROCESS IS NOT DONE ON MILD STEEL ..???? A. hot plating, B. electrolysis, C. explosion bonding, D. metal spraying (a majority.) 58. You have started pumping out a Fore peak tank. The ballast pump is running showing a low discharge pressure but a positive suction pressure,Chief Engineer asks you to throttle the discharge valve to increase the back pressure on the pump. Why do you require to do the same? A. The pump???s discharge rate needs to be controlled as it is pumping at a higher than rated capacity B. Chief Engineer wants you to slow down as the deballasting is going on too fast and will finish sooner than expected ….C. It is a misconception that pumps operate smoothly at increased back pressure and throttling of the discharge valve is a wrong practice D. Centrifugal pumps cannot operate at greater than rated capacity, so throttling the discharge valve is only going to decrease the discharge rate below rated capacity (majority) 59) Which of the foll. is a true statement A) Aluminium will b subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte.
b) Stainless steel will b subject to preferential corrosion when in electrical continuity with mild steel in presence of an electrolyte. C) Copper will b subject to preferential corrosion when in electrical continuity with stainlesssteel in presence of an electrolyte d) Aluminum will b subject to preferential corrosion when in electrical continuity with zinc in presence of an electrolyte. 60)main engine is running but viscosity of fuel cannot be maintained.fuel oil heater have a maximum rating of 4 bar steam pressure.steam through a pressure reducing valve is provided to the heater at 4 bar but still viscosity of fuel annot be brought down below 20 cst. as a good marine engineering practice what will you do? a. let the engine run at same rpm n wait for the port to come to carry out the cleaning of heater b. reduce the rpm till next port arrives n then clean the heaters c. increase the steam pressure by adjusting the setting of steam reducing valve d. stop the engine n clean the heaters (final ans d. sureshot. Cos q says good mep..also there is no pt of increasing stm pr above 4 bar.).
61)The automatic/manual recirculation valve provided on the S.W. overboard line is provided so that: A. S.W. temperature can be regulated and coolers can maintain correct temperatures even with low S.W.temperatures. B. S.W. temperature can be regulated and coolers can maintain correct temperatures even with high S.W.temperatures C. S.W. can be re-circulated when outside water is extremely muddy D. S.W. can be re-circulated to conserve when sea chest suction filters become very dirty (A sure fb majority) 62)Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be: A. Throttle the steam outlet valve B. Renew the trap C.Lap the disc and the seat of the trap D. Throttle the steam inlet valve (sure ans. Ref mcgeorge) 63. Resistance to corrosion of Aluminium alloys is due to : A. Aluminium being a very noble metal when compared to other metals in Electrochemical series B. Formation of Aluminium oxide(Alumina) passive film on surface C. The rate of corrosion is very low due to very high corrosion potential D. All of the above. (sure ans. Frm Wikipedia. And fb majority)
64)Fuels as produced in a refinery are generally sterile, however, contamination can occur as fuels are A.stored at the refinery B. stored on the vessel C.transported to the distribution sites D.All of the above are correct (All people wid d) 65)when A/E stand by F.O.heater in use of main engine a. Sudden opening F.O. inlet valve pressurized and damage the heater b. F.O. in vapour lock inside heater allow steam c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not pressurized may cause sudden change in engine /per load/rpm d. heater leaking. Q is incomplete. Bt majority wid c. 66)Which of the following statements concerning antifriction bearings installed on pumps is true? (a) The inner race should be free to turn on the shaft. (b) The outer race should be free to turn its housing. (c) Alignment is not a critical factor in their installation. (d) They are usually pressed on to their shafts (According to uscg. Gen q 296) 67)During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged B) Reduce the vacuum further to control the relative expansion C) Keep manoeuvring irrespective of damage to the turbines D) Request the bridge to try to reduce number of astern movements (majority) 68)If three Centrifugal pumps are running in parallel and the backpressure is substantially increased, what effect will be observed on the pumps in use. A. Flow rate will reduce. B. Increase in the pump casing temperature. C. Safety alarms and trips (high casing Temperature) will activate, if no corrective action taken D. None of the above. E. All of the above. (Fb majority.Bt without any reference) 69.Before putting into operation a coalescer type Oily Water Separator, it is important to: A. Fill it up with purge water B. Drain it completely
C. Switch off the heater D. Keep the three way valve manually open (sure ans) 70.The water from discharge side of the a centrifugal pump is supplied as sealing water to the stuffing box for the pump shaft at: A. Sealing ring B. Shaft sleeve C. Lantern ring D. Neck bush (sure mcgeorge diags) 71.Process of enrichment of surface of steel and steel alloys by zinc using Electroplating is known as A. Cathodisation B. Galvanisation C. Neutralisation D. Dezincification (majority ans. sure.) 72)Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine components A. Increasing the atomization pressure of fuel injectors B. Fitting exhaust valves with valve rotators C. Running engine at or near normal sea load D. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and other as clarifier (sure ans. Fb majority.) 73.After O'Hauling pumps, pumps cannot be turned freely by hand, the possible cause could be A. Uneven tightness of the casing Nuts B. Gasket between the casing too thin C. Big clearance between the wear Ring D. Only A E. A and B F. A and C (fb majority. sure) 74.If the direction of rotation of a gear pump is reversed due to change in-phase sequence, what happens when the pump is started? A. Direction of flow remains the same B. The pump will get damaged due to overpressure on suction side C. Pump relief valve will be lifted D. The direction of flow will be reversed(sure) 75.resistance testing should be ideally done on electrical equipment when the equipment is:
A. Cold B. Hot or at working temperature C. In operation D. At part load (sure ans. Fb majority) 76.Sherardising ,Chromising and Calorising fall under which of the processes of metal coating application : A. Thermal spraying B. Electroplating C. Diffusion coating D. Metal cladding (fb majority ) 77.All other conditions remaining constant, when centrifugal pump is changed over for pumping a liquid of higher specific gravity, the discharge head of the pump at the rated capacity will A. increase B. decrease C. Remain same D. Can???t say, depends on other factors too (c sure. Centrifugal pps are constant head machines www.engineeringtoolbox.com/centrifugal-pumps-d_54.html) 78.The process of depositing chromium on to steel surfaces by diffusion coating is known as : A. Galvanising B. Chromising C. Calorising D. Coppering (majority. sure) 79.Centrifugal pumps cannot handle air and require priming.But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:A. Fluidity only B. Density only C. Both fluidity and density D. Compressibility (Lot of confusion.Majority with c.) 80.For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W.temperature through the cooler has decreased from 12 deg. C to 7 deg. C over a period of time, while the drop in temperature of L.O. across the cooler has also decreased.All other coolers have been reported to be working normal & M/E
is also running at a constant load in calm weather.What is the inference drawn by decrease in the temperature difference? A. The cooling S.W. inlet temperature has reduced B. The efficiency of the cooler has increased over a period of time C. The cooler has become dirty on the S.W. sideor L.O. side D. S.W. side of the cooler may be partially blocked with mud and sea shells (Sure ans. Majority) 81.When centrifugal pump is changed over for pumping a liquid of higher specific gravity which of the following is going to change? A. Discharge pressure B. Discharge head C. Power consumption D. Pump speed (www.engineeringtoolbox.com/centrifugal-pumps-viscosity-d_54.html centrifugal pps are constant head machines. Wen sp gr increases to keep pp rpm same power increases. Pr also changes..) 82. use of synthetic polymer treatment limited to low pressure boiler why a-does not prevention of scale formation b- does not prevent the sludge formation c- does not have po4 to tackle caustic embrittlement d- all of the above (http://www.globmaritime.com/forum/Boiler/246-marine-boiler-water-treatment majority with c) 83.auxiliary engine crankpin bearings are normally renewed. a.at each de-carbonisation b.at alternate de-carbonisation c. at 10000 hours interval d.after checking the bearings weardown (Majority. And logical also) 84)A ball vv found leaking in service needs to be overhauled. What type of repairs can b carried out? A the ball and seat can be lapped together B the ball can be machined while the seat can be replaced C normally both non metallic seats get wornout and have to be replaced D normally ball gets damaged and has to be replaced. (As per fb majority) 85)A submerged type centrifugal pump is sometimes used as the Main L.O. pump. Why is this? A. Flow rate required for Main L.O. systems are very high B. The pressure required for Main L.O. system is high C. It is a wrong design and such systems normally give problem
D. Both the pumps can be run together when the bearing temperatures are increasing (Majority with a) 86)It is a known fact that centrifugal pps require priing for pumping liquids, as they cant handle air and will lose suction due to air entry. But on the other hand t/cs use centrifugal compressors for supercharging. Which of the following do u think makes a centrifugal compr to pump air and behave differently than the centri. Pps? A presence of air cooler B presence of labyrinth seal C high speed of rotation, very fine internal clearance and large impeller diameters. D difference in the principe of operation. (Fb majority.) 87. Which of the foll. Cannot b removed fr fuel oil by centrifugal in the purifier n micro filtration? a. Sodium b. Aluminium n silicon c. Vanadium d. Ash (fb majority.) 88-The function of an accumulator on the discharge side of a reciprocating bilge pump is to: A. Supply liquid even when the pump is not running B. Dampen out the pressure pulses and smoothen the flow C. Increase the discharge pressure by storing liquid under pressure D. No such device is required to be fitted to modern bilge pumps (majority) 89 F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is a sounding of 6.0 m in the F.O. deep tank. The suction pressure gauge was renewed recently and is showing a positive pressure whenpump is running, but Pump is not transferring any F.O. What is the most probable cause? A. Pump is damaged and needs overhaul B. Suction filter cover gasket might leaking C. Pump relief valve might be leaking D. The pump suction pipeline is blocked (lot of confusion. A cant b ans. In case of d, suctn pr wil b negative. Relief vv is leaking not lifted fully. So some liq wil definitely flow. So b seems to be right choice.) 90) you must have used rubber reinforced joints. The reinforcement is normally provided using non asbestos fibres. The reinforcement is provided because
A ordinary rubber gasket has porous matrix. Having capillaries which can allow liquid leakage when subjected to high pr. B to increase load carrying capacity of the joint so it can withstand high pr. C to incr temp resistance of joint D to protect the joints from fire or other accidental damage. (fb majority. In case mcq bc.)
91.Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing (Fb majority abd is clearly given from site.) (http://www.machinerylibrication.com/read/28854/prevent-bearing-failures) 92)Static suction head of the pp is a. distance of the suction liq lvl above the centre line of the pp b. distance of the suction liq lvl below the centre line of the pp c. force necessary to overcome frictional losses in the pp and piping d. amt in inches of mercury the total suctn head is below atm pr. (uscg q.) 93) centrifugal pp will typically give u low flow rate at low pr. Where a piston pp wil give u more pr and high flow rate. Is the statement correct? A true B false C 1st one right 2nd one wrong D I dnt know. (fb majority with b.) 94)sudden opening or closing of sea water pipe can cause A cavitation B water hammering C steam hamering D no problem (majority.) 95)Stm stop vv is eased off its seat during blr start up for?? A to alow thermal expansion of parts. B to allow stm flow during start up C to prevent water hammer D all of the above. (ans a by samant.so majority also.)
96)which of the following is the material is used to manufacture tube plates of a shell and tube type heat xchanger? A cupro nickel B al brass C admiralty brass D gunmetal. (c ans frm mcgeorge and majority.***) 97- An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you (a) Continue to run the engine and wait for some time (b) Stop the engine for a while and make some checks (c) Reduce the load of the engine (d) Run it on steady load to make some checks. (b taken practically..!) 98)The common term used for failure of metal and alloys in a corrosive environment , when subject to high stresses is known as : majority A. Fatigue failure B. Corrosion fatigue C. Stress corrosion cracking D. Fretting Corrosion (majority) 99- What to check if Engine is not taking load.???? a. Water tightness to be checked. b. Air to be removed from jacket water outlet line. c. Priming lube oil pump to run before starting the engine. d. Check the lube oil level. e. Check the flow of lube oil. f. Blow through the engine before starting (may be) 100- The diameter of the branch suction pipe referred to in item 118 shall not be less than that derived in accordance with the following formula, taken to the nearest 5 mm: Lowercase d equals 25 millimeters plus 2.16 times the square root of the product of C times the sum of B and uppercase D where: d - is the internal diameter of the branch suction pipe, in millimetres C - is the length of the cargo hold, in metres B - is the greatest moulded breadth of the ship in metres D - is the moulded depth of the ship to freeboard deck, in metres (no idea) 101-Graphitisation is the term used to describe:
A Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite b Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to loss of strength c Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion d Chemical reaction between pure graphite and iron so as to increase the graphite content of iron (not sure) 102-.Hot corrosion in exhaust valves and fire side of boiler mainly when : A. Fuels containing vanadium content with high sodium content are used B. Fuels containing vanadium content with low sodium content are used C. Fuels containing high vanadium and high sulphur content are used D. Fuels containing high sulphur content is used and the exhaust temperatures are uncontrolled and exceed 600 deg. C (fbmajority.) 103 THROTTLNG OF SUCTION V/V OF SCREW P/P?? A)alter dicharge capacity b) no alter discharge capacity c ) alter fluid density d) alter fluid pressure & density (majority) 104- Metal cladding provides protection to the metal essentially for the life of ship because A. During cladding the protective coating reacts chemically with the base metal and inhibits corrosion B. This is the only method in which the completeness of the metal coating can assured, while other methods are liable to defects C. The thickness of protective coating is greater compared to any other metal coating method used D. The adherence of coating is best in case of metal cladding (ans by samant) 105.Cladding is the process used for :A.Protection of metal surfaces against corrosion B.Protection of metal surfaces against erosion C.Protection of metal surfaces against cavitation erosion D.Protection of metal surfaces impingement corrosion (find out) 106)sea water outlet temp. of a lube oil cooler decreases but inlet temp. remains same. load on main engine is also constant what can be concluded from this
a. decrease in cooler efficiency(Ans) b increase in cooler efficiency c. decrease in lube oil temp. d. increase in lube oil temp. 107. Reciprocating compressors lines are fitted with a _______ to keep the discharge free of pulses a. Accumulator b. Unloader c. Safety valve d. Pressure reducing valve (sure ans. Majority) 108. Which of these not self actuating valves. a. Check valve b. b. relief valve c. c. ball valve d. d. safety valve (Sure ans. Majority) 109. When centrifugal pump is overhauled it was found that shaft had developed grooves on it n no spare is available onboard what action can be taken a. Order a new spare b. Assemble the pump without doing anything n wait for the spare to arrive. c. Machine the shaft sleeve on lathe n put back the new packing. d. Leave the pump as it is (c cant b ans. Cos q says shaft with groves. Then wats the pt of machining shaft sleeve???) 110. Dezincfication is the term used to describe a. Loss of zinc an alloy due to formation of internal bimetllic cells due to different Alloying element b. Loss of zinc due to external bimetallic cells between zinc alloy and another Dissimilar metal or alloy c. Removal of zinc from an alloy be precipitation from Eutectic solution ( bmajority **) 111. Emergency fire pump has been lined up for supplying to fire hydrant on deck. As Soon as pump is started the vacuum pp engages. The suction of the pump goes into High vacuum but the pump discharge pressure remains zero, and the vacuum pump Doesn???t disengage ? What is the most probable cause for the pump not to take Suction?
a. The discharge pressure gauge is defective showing zero discharge pressure b. The pump suction filter might be clogged c. The suction pressure gauge is defective showing high vacuum d. The vacuum pump is defective (sure ans. Majority.) 112. Boiler not stating in 2-3 time, what we do a. Check fuel ignition system b. Check fuel burning system c. Check furnace d. All above ( final ) 113. Sea chest is to b cleaned n u found that the filter is stainless steel bucket type filter, Inside which there is a zinc anode. The purpose of anode is to __________ and should b Electrically _________ with filter body. a. Stainless steel filter, isolated b. Mild steel body, continuous c. Protect adjacent pipelines, continuous d. Seachest, isolated (sure ans. Majority) 114)Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :A. Increasing cylinder oil feed rate B. Using high TBN cylinder oil C. Increasing scavenge air temperature D. Decreasing cylinder oil feed rate (majority) 115. The seating mtrl. For perfectly sealing type Ball Valves is usually made up of a. Rubber b. PTFE or Nylon C. Rubber reinforced with steel wire d. Stainless steel b and c (majority) 116. Why centrifugal p/p not provided with safety valve while positive displacement p/p Is provided? a. c/f p/p shut down head is o b. c/f p/p shut down head is infinity c. c/f p/p is so designed that it can withstand high pressure (ot sure) 117. Refer compressor oil should hv following properties:-
a. Chemically inert wrt refrigerant b. Should b able to perform at lower temp (viscosity n cloud point) c. Should hv a certain emulsification properties with water.. d. Should absorb water but still perform the lubrication (find out on fb.) 118. I.R. testing of 3 phase induction motor is done a. Phase to phase b. Earth to body c. Phase to earth d. Both a and b (Ans is a and c from dt hall) 119. Cavitation erosion occurs due to a. Chemical action b. Physical action c. Chemical OR physical action d.Combination of chemical or physical action. (majority) 120. Butterfly valve stuck in half open position. Hw to repair(multi) a. Cant b taken out in open position fr line so try to close valve any how b. Apply hammer to shut it. c. Remove pipeline n do overhaul d. Cannot b repaired onboard. (seems logical. Majority) 121. Dirty air filter on a Centrifugal Blower cause a. Overheating b. Cavitation c. Vibration d. All 122.____ Provide in protection against mild steel galvanic corrosion a. Copper b. Aluminium c. Stainless steel d. None (sure) 123. 2. Fire p/p1 water to deck discharge pr 5 bar deck hydrant not getting water. Fire p/p2 discharge pr 2.5 gives water. Fire pump 1 unable to send water to hydrant. What is the reason? a. Pump pressure gauge defective b. Overboard discharge v/v fully opened so water is not going to deck c. Pump suction filter choke d. Pump discharge v/v may b stuck (sure. Fb majority)
124. Which of the foll. Conditions can cause above normal air temp. to develop in the intake Manifold of a four stroke/cycle, turbocharged, diesel engine? a.clogged air intake filters b.Piston blow by c.A defective after cooler d.faulty exhaust valves (sure if single ans) 125. Best sealing is which vv>? a. Globe valve b. Butterfly valve c. Gate valve d. Ball valve (sure) 126. When steel components electroplated with chromium r used in corrosive environment a.Chrome plating prevents corrosion b.Protection to the steel wl b preferentially corroded c.zinc plating is used on top of chrome plating for corrosion protection d.Thickness of chrome plating to increase (majority.) 127. Auxillary engine connecting rod bottom end bolts should be tightened a. only as per prescribed torque using a torque ran b. as per prescribed torque as well as angular measurements as recommended by manufacturers c. by foll. Previous match marks on bolt heads n connecting rod body d. as per prescribedtorque n another 10% increase during every subsequent tightening (sure fb majority) 128. which of the foll. R true as far as painting of steel hull/structure is concerned? a.Painting can b done under any wether condition b. Painting can only b done after proper surface preparation is carried out c.painting should only b done on top of appropriate primer coating d.several coats of paint can b applied one after other without any time gap (sure fb majority.) 129. Which of the foll. Is false about hydraulic jacks/tensioning tools?(single option) a.Piston of the jack should b turned back by a certain degree after hand tightening to prevent easy removal after untightening of nut. b.Piston of the jack should not b turned back after hand tightening during untightening of the nut.
c.Piston of the jack need not b turned back during tightening of the nut d.Hydraulic pressure need not b relieved during removal of jack. (b by samant. B and d seems logical. Still confused) 130. What is the purpose of the Bypass valve ( Automatic or Manual operated) on the positive displacement pump? A. Control the Discharge Pressure B. Another valve provided for Discharging C. Not required D. I don't know (sure fb majority) 131. sewage air compresser freq of starting a)every 18 hur b)every 24 hr c)continously d)once in two week (sure) 132.After removing all the bonnet securing nuts of a large size globe valve it is found that the bonnet is not coming out because of strong adhesion of the gasket between the bonnet and the body. What are you going to do in line with the best practices?(choose the best alternative) A. A chain block can be hooked onto the handwheel and bonnet should be (freed out of gasket adhesion) lifted clear of the valve body B. Hammer the valve bonnet and the bridge from all sides using a big hammer until the bonnet is free????????? C. Use a hammer and chisel and try to force the chisel in, at the joint of bonnet and body equally from all the sides until the bonnet is clear *** D. Try to close the valve disc further onto the seat by turning the handwheel in closing direction so as to ??? jack-up??? the bonnet (d as per onboard practice. Ask on fb again) 133.Double entry impeller of centrifugal pump a. Inc. axial thrust b. Inc. motor load c. Red. Load on pump bearings d. Inc. load on pump (majority.. all ppl with c.) 134)the crank web deflection readings of a diesel engine would be erroneous in which of the following conditions? a. when the draught of the vessel has changed while readings were being taken b. when cargo loading and discharging has been too rapid c. when the crankcase temperature has changed substantially during the process of taking the readings d. none of the above (Ans a b c. majority and logical) 135Why are large centrifugal pumps started with their discharge valves closed? A. To ensure proper priming
B. To limit sudden rise in discharge rate C.To limit motor starting current D. To minimize starting torque on motor shaft ( a frm mcgrg pg 162.) 136)Ship is in dry dock , stern tube seal renewal has been carried out, hw wl check For leak a. Fill the system with oil to max. level in header tank b. Fill the system with oil to just fill stern tube c. Fill the art seal n forward seal tank to deepest draught d. Refloat vessel to check for any leaks (B according to ships manual.) 137)Corrosion resistance of ss in presence of o2 in aerated water?? A o2 inhibits chemical reaction. B o2 combines with ss to form passive oxide layer C o2 gets absorbed into ss. (B sure http:/en.wikipedia.org/wiki/stainless_steel)
138)Cold and viscous lo of an aux engine is most likely to cause___ A sudden stopping of engine (pawa) B difficulty in starting C rhythmic knocking sound frm inside of engine D drop in rpm of engine. (Majority) 139)Before starting a centrifugal pp eith priming pp, it shud b insured that _____ is at the correct level. A lube oil B sealing water C fuel oil D sealing oil (Sure) 140)The amt of current reqd for iccp depends upon A wetted surface area B quality and condn of protective paint coatings C speed of the ship D sw temp. ( few ppl with abcd.) 141)Which of the following anodes of iccp can b used for comparatively higher current densities? A zink B high silicon iron
C lead silver D platinized titanium (majority with d. no reference given) 142)Wat cud b the reason if feed pp can hardly pp in water to the auxillary blr causing cascade level to rise and temp too high??not sure A high ambient temp B clogged condense water tubes C filter dirty D low cascade water level. 143)Yourship has ows and reciprocating bilge pp of capacity 2 m3/hr. it takes about 12 hrs to pp out whole bilge tk by that pp. the ship is going to drydock. And chief engr recommending company to install a centrifugal pp of capacity of 10 m3/hr. as a bilge pp so entire bilge tk can b pped out in 2.5 hrs.the company should: A accept the proposal as a centrifugal pp has several advantages over a reciprocatin pp. B there is no q of acceptin a c/f pp as bilge pp C propose to fix a gear pp instead of a centrifugal pp D pipelines and pps once designed cant b changed as they are class approved. (***Samant sir with b. one chief engr with d.mcgeorge says centr pp can b fitted with priming unit) 144) 1.#1 cargo tk has a cargo A with sp gr 0.7 and #2 cargo tk havin cargo B with sp gr 1.05 2. #1 cargo pp is takin suctn frm #1 cargo tk while #2 frm #2 and both are pping shore to two identical tks . 3. #1 and #2 cargo tks both are identical and both had same sounding during starting. Pps are also identical and placed in pp room 4.disch manifold and shore pipelines for both the cargoes are identical and disch vv for both fully open. Wat wil b the disch pr reading of both pps? A. #1 disch pr wil be higher than 2nd one B. #2 disch pr wil be higher than 1st one C. both wil b same as pipelines are identical D.cant say anything as disch pr wil b affected by various other parameters. (majority sure ans.) 145)Which is biggest? A NPSH B NPSHA C NPSHR D TOTAL SUCTN HEAD. (majority.)
146)Carbon content in steel? A less than 1% B less than 2 % C less than 3 % D any carbon content (majority.Weki[edia=> it is upto 2.1%) 147)In a sw cooled jw cooler the most common cause for loss of cooler efficiency is A scale formation on jcw side B mud or slit deposits on jcw side C scale formation on sw side D none of the above (Majority. Sure.) 148)Which of the following valves are designed to have valve seats in pairs one facing the inlet side and other facing outlet side within the vv body? A butterfly vv B ball vv C globe vv D gate vv (Majority with d. bt no reference. Few people with b. ref pretty convincing www.thomasnet.com/about/ball-valves-90370206.html) 149-.Net Positive Suction Head is the A. Difference of Total suction head and Total discharge head B. Difference of static head and the frictional head C. Difference of dynamic suction head and the vapour pressure of liquid D. Difference of Static suction head and the vapour pressure of liquid (.) 150)With reference to a Data Logger for a refrigeration system, which of the following parameters should be monitored? A. Room temperature. B. Liquid Line temperature. C. Recharge temperature. D. Solenoid valve operation. (lot of confusion. Majority with abd) 151)A reciprocating pump is used for Engine room bilge service because: A.Reciprocating pumps are designed for smoother discharge B.Only small capacity pumping capacity is required, while other pumps are of higher capacity C.It doesn???t churn and mix the bilge water unlike other types of rotary and rotodynamicpumps
D.Shipbuilding industry is still going on old concept, future ships will have centrifugal pumps installed (majority) 152. The machinery which is usually tested first once the ship reaches a dry dock is A.Engine room crane B.Engine room lift C.Gantry crane for engine room D.All of the above 153.the size of solid particle contaminants in hydraulic systems is measured in: A.Millimeter cubed B.Nano-millimeter C.Microns D.Micro millimeter (majority.) 154.Which of the following types of boiler burners have maximum turn down ratio? A. Pressure jet type B. Spinning cup burner C.Spill type burner D. Y-jet type burner (flannagan. Sure ans 20:1) 155)By which of the following is the attached vacuum pump of a ballast pump is driven? A electrically driven B hydraulically driven C pp driven clutch mechanism D pneumatically driven (sure ans) 156. viscosity of fuel oil used for ME was 145cst,new fuel comes whose viscosity was more than earlier, what should u do a) increase temp setting b) change setting of viscotherm c) do nothing d) open steam valve manually more (sure ans.) 157)U have seen and operated several valves onboard ships. All the butterfly valve operation handles are operated by a locking arrangement because: A. Butterfly valves do not used gland packings and thus spindle doesn???t have anything to keep it in position and can open by vibration
B. Butterfly valve does have a spindle packing but same cannot be excessively tightened to have good grip on the spindle to prevent it from opening against vibration C. Butterfly valves can move by vibration but that is not the main consideration, the main consideration being opening/closing against liquid pressure D. All the butterfly valves do not have locking arrangement as there is no such requirement for the same (majority.) 158) SCREW P/P NORMALLY USED FOR A.FLUID WITH HIGH VISCOCITY B.FOR BETTER PERFORMANCE AT VARIABLE TEMP. C FLUID MIXED WITH SOLIDS D ALL ABOVE (find out) 159) CENTRIFUGAL P/P REQUIRED PRIMING BCOS THEY UNABLE TO HANDLE A VOLATILE LIQUID B HIGH TEMP LIQUID C LIGHTER LIQUID D AIR & GAS (sure ans) 160)WHENTWO DISSIMILAR METAL HAVING ELECTRICAL CONTINUITY ARE PLACED IN ELECTROLYTE THE TYPE OF CORROSION A SELECTIVE PHASE CORROSION B CAVITATION ERROSION C BIMETAL CORROSION D CORROSION FATIGUE (http://www.roymech.co.uk/Useful_Tables/Corrosion/Cor_bi_met.html bietallic corrosion aka galvanic corrosion aka dissimilar metal corrosion.) 161) CAVITATION OF CENTRIFUGAL P/P A NPSHr>NPSHa B NPSHa>NPSHr C total suction head NPSHr (sure) 162The corrosion protection for Cooling Fresh Water systems of Marine Diesel Engines is normally provided by : A. Sacrificial anodes B. ICCP C. Protective Metal coatings of system components D. Addition of corrosion inhibitors to the Cooling Fresh water (sure ans)
163.The steels with a carbon percentage close to 0.8% have A. poor strength but good weldability B. High strength but poor weldability C. Poor strength and poor weldablity D. High strength and good weldability (b) 164.Which of the following cannot be used as sacrificial anode for the protection of Mild steel structure against corrosion : A. Cadmium B. Magnesium C. Copper D. Aluminium 165.Excessive lubrication in compressors can lead to: multiple A. Sticking of valves B. Carryover and deposit of oil particles in pipelines and reservoirs C. Decompression D. Detonation 166.The pumps performance depends upon A. Clearance between the wear ring and the impeller B. Clearance between the impeller and the casing C. Clearance between impeller and shaft D. Clearance between mechanical seal and shaft (majority) 167)A multistage centrifugal pump is normally used A. High head B. High discharge flow C. High viscous fluids D. Low viscous fluid (sure ans.) 168. In a three phase electrical equipment, the immediate action in the event of a fuse blowing in one of the phases, would be: A. To replace with a fuse of correct rating B. To replace fuses on all three phases C. To try to repair the fuse D. To investigate the fault that led to the blowing of the fuse (replacing or repairing is nt gonna solve the root problem) 169. A drain cooler is provided with S.W. cooling. What is the best way to increase the temperature of condensate draining to the hotwell? A. Throttle the S.W. inlet valve B. Throttle the S.W. outlet valve C. Open the condensate Bypass to the cooler
D. Close the condensate bypass to the cooler (majority) 170. During auxiliary engine de-carbonization, which of the following checks need to be carried out? A. Sounding of all double bottom tanks B. Connecting rod big end ovality C. Liner wear D. Crack detection tests on connecting rod serrations (fb majority) 171.In a reciprocating pump the direction of flow depends upon: A. Direction of rotation of the pump B. Position & fixing of suction and discharge valves C. High pressure to low pressure D. Whether pump is single acting or double acting (sure) 172.Fire side in boilers gets commonly corroded due to : A. Galvanic action B. Formation of Vanadium pentaoxide and sulphuric acid C. Stress corrosion D. Crevice corrosion 173.In a shell and type M/E L.O. cooler, the temperature of L.O. is controlled by an automatic temperature control valve. Out at sea with M/E running at sea load it is observed that the temperature control valve opening to the cooler is increasing day by until it becomes 100% open to the cooler. The L.O. outlet temperature _______________ after the above condition has reached A. Starts decreasing immediately B. Starts increasing immediately C. Will be maintained at the set point of the temperature controller D. Cannot be maintained at the set point and will increase slowly (fb majority) 174.During shutting down the purifier you find that purifier always vibrates heavily for some time and then becomes normal until it finally comes to a stop. What is wrong with purifier? A. The purifier design is faulty B. The purifier bowl has a heavy sludge deposit and requires cleaning C. The purifier bowl is not balanced properly D. During shutting down most of the purifiers pass through the critical speed zone (sure) 175.Which of the following can cause exhaust with black smoke in a diesel engine?multi choice A. Choked air filter of turbocharger
B. Water mixed with fuel C. Bad atomization of fuel D. Overload 176).the purpose of the wearing rings used in a centrifugal pump is to A. Prevent internal explosion in the pump when it is overheated B. Enable a visual inspection of the pump when it is running C. Ensure a proper alignment of the pump coupling to the driver D. To isolate suction and discharge side (sure) 177)you have a two stage centrifugal pump, with both stages in parallel configuration. after dismantling the pump you realize that you forgot to the marking and both impellers are identical.both the impellers are single entry type and the eye of both the impellers will come in opposite direction what are you going to do? a. since marking was forgotten, so we need not worry, any impeller can come in any place as they are identical b. any impeller can come in any place, but the phase sequence of the electrical motor driving the pump may have to be reversed, if impellers have exchanged places c. you have to find out the right placement of the right impeller with respect to the direction of rotation or by looking at the volute casing d. hit n trial method can be utilised for fitting the impellers (discuss) 178)boiler corrosion is prevented above 100 deg by formation of a protective layer inside of a. ferrous hydroxide b. magnetite c. haematite d. iron sulphate (majority) 179)in impressed current cathodic protection system , the current for cathodic protection is supplied by : a. use of sacrificial anodes b. a low voltage dc supply c. a low voltage a.c. supply d. 110 v a.c. supply 180)in a centrifugal pump discharge must be in the direction as that of a. direction of vane curvature from eye to impeller b. direction of vane curvature from impeller to eye c. depends on shape of volute casing d.none of the above
181)a centrifugal pump may fail to deliver water when first started if the _________. a: water seal pipe is plugged b: pump is not primed c: seal ring is improperly located d: impeller is flooded 182)in a centrifugal pump sealing between gland packing and bearing housing is provided by_____uscg que. Sureshot ans a: shaft seal b: water flinger c: o-ring d: lantern ring 183)weldability of a metal depnds on its carbon chemical equivalent(ce). for steel to have good weldability its ce must be: a.ce <= 0.35 b.0.35 to 0.40 c.0.40 to 0.50 d.0.50 to 0.60 (frm wekipedia upto 0.35= excellent 0.36 to 0.4= very good.) 184)you are pumping out sludge to a shore facility using your sludge pump. you find that the discharge rate of pump is very slow and suction filter is getting clogged frequently.what is the best alternative to counteract the problem? a.remove the pump suction filter and pump out the tank b. increase the tank temperature, keep an eye on the pump suction pressure and clean the filter as soon as it drops c. as soon as the as the shore facility tells you that they are not receiving any sludge, you stop the pump and clean the filter d. fabricate a bigger mesh size suction filter and use in place of normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate 185)which of the following would be the correct way(s) of using a torque wrench? (mcq) a. application of jerk pulls while tightening b. using an extension c. tightening beyond the characteristic clicking sound d. none of the above (sure) 186) which of the following statement is false abt galvanic corrosion? a. metals close to anodic end of the galvanic series corrode in preference to ones close to cathodic end. B when any single metal exist in the system it cant corrode due to galvanic action. C zn is anodic to steel and is often used as protective coating D corrosion rate is affected by temp.
187) refer compr working continuously. Reason cud b A insufficient condenser cooling B air in the system C leakage frm solenoid vv D excessive refrigerant (I think it’s a. logical ans.) 188)After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the following is the best alternative? A. You can open the filter inlet and outlet valves & directly start using the filter B. If you do not want to use the sea chest in question, you need not worry and you can open the valves when required C. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and thereafter filter can be kept isolated or used as required D. You will close the other side sea chest valves first and then open this side sea chest filter inlet and 189The suction pressure gauge of the Engine room bilge pump is broken and you don???t have a spare. Chief Engineer has asked you to troubleshoot the problem with Bilge pump not taking suction from Fwd.(P) bilge well. You try taking suction from Fwd. (S) & Aft Bilge well and find that pump is taking good suction. Thereafter you try suction from Fwd. (P) bilge well for sometime after priming with Sea Water but there is no change in level. You inspect the suction filter of the pump and find that it is very difficult to remove the same, you had to apply too much of force to lift the filter cover while normally it comes out easily. What does it indicate? A. It does not indicate anything, sometimes the filter covers are difficult to remove. B. It indicates that the suction valve of the Fwd. Bilge Pump is leaking C. It indicates that the suction filter of the Fwd. (P) bilge well is clogged completely D. Pump suction filter might be clogged 190)Which of the following instruments is used to measure rudder carrier bearing wear down? A. Poker gauge B. Telescopic feeler gauge C. Depth gauge D. Trammel (sure ans)
191)The common term used for failure of metal and alloys in a corrosive
environment , when subject to high stresses is known as : majority A. Fatigue failure B. Corrosion fatigue C. Stress corrosion cracking D. Fretting Corrosion 192)2 comprs shudnt b run in parallel because A its not efficient B it wil give overcapacity in the system C there is possibility of loosing oil frm 1 compr to other D a and b (someone said its uscg q. ans is c???SIMILAR Q GIVEN IN USCG. FOR REFER COMPR.BECAUSE THERE MUST B 2 EQUALISING LINES IN THE CRANK CASE AND ONE IN THE RECEIVER WHICH SHUD B KEPt OPEN WHILE 2 COMP R RUNNIN IN PARALLEL. ELSE OIL FRM 1 WIL GO TO ANOTHER.) 193)Less vacuum in centrifugal pp A leaky disch vv B loss of gland packing C loss of fluid frm suction tk D long suction pipe (majority) 194) The centrifugal pump r normally A) Positive displacement type B) Rotodynamic C) Screw type D)Gear type (sure) 195) Sludge pump suction pressure is going full vacuum when u start the pumptaking water of double bottom tank suction u hv checked the suction filter n found in clean condition. Taking suction fr fuel oil sludge tank does not happen. Causes of the problem. A) Pump is not working efficiently n reqd. overhauling B) F>O> sludge tank suction valve is leaking C) W.O. tank D.B. tank suction pipeline has a blockage. D) Can ???say what is the problem but definiterly the pump needs to b opened up for overhaul (majority) 196)The difference between the discharges of a centrifugal pump n reci pump the discharge of centrifugal pump is ----------while that if reci is --------A) Turbulent, Laminar B) Intermittent continuous C) Continuous pulsating D) Pulaating continuous
(sure) 197)33. Ballast pump injection filter was cleaned n the pump was lined up it was found that there was some leakage in the suction filter suction. The pump started n the leakage started. During deblasting it was found that the pump could not take suction fr one of the double bottoms. The cause could be A) Pump was drawing air fr. B) Pump was drawing air fr suction filter C) One of the pipelines on the suction side of the pump might be leaking D) The filter was not cleaned properly. 198) Not preventing cold corrosion in M/E component a. Running Evy aat high load b. J/W cooling temp. high c. High TNB cylinder oil d. Cooling charge air in air cooler dew point. (sure) 199) Super chlorinating of fresh water tanks in dry dock is done by: A. Washing the tanks with 100ppm chlorine solution B. Washing the tanks with 50ppm chlorine solution C. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean water D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water (sure ans ref mcgeorge) 200)The delivery rate of an axial piston hydraulic pump is controlled by varying the position of the _____________. tilting box slide block pintle reaction ring 201)Sewage plant blower is off, what is the ideal alarm a. Blower suc press low b. Blower disc press. Low c. Blower motor fail d. none (sure) 202) Which of the foll wl cause cavitation a. Low discharge pressure b. Throttling the suction valve c. Low water level in the wet well d. High discharge pressure (sure)
203)With ref. to centrifugal pump charac, what wl b the effect when p/p is started with Suc v/v closed or disc v/v closed: a. Suc v/v shut head & flow rate wl be o; disc v/v shut flow rate wl b o n head wl b max. height. b. Suc v/v shut head wl b o & flow rate wl b min , disc v/v shut flow rate wl b o head wl b min. ht. c. Suc v/v shut head n flow rate wl be o; disc v/v shut flow rate wl b min n head wl b At min ht d. None (sure) 204) A pump being used to deballast f for peak tank which is full, it it seen that suc pr is Positive n dis pressure is very low compared to rated discharge head, it indicates that a. Pump is not operating satisfactorily n pump capacity is too low b. Pump is not operating satisfactorily n Pumping capacity is higher than rated, Throttling of discharge valve is reqd. c. Pumping capacity is not affected by suc n discharge pressure d. Pump is operating normally 205)When specified discharge pressure is not achieved, the possible cause could b? a. Discharaage pressure too high b. Pump speed too low c. Casing ring is worn out d. Cavitations exists e. All 206)Protection of zinc [rtective coating is good at a. 50 Deg. Cel. B. 65 c. 90 d 115 (discuss) 207). The overheating of fuel oil in the fuel oil heaters may result in a. Excessive atomization b. Clogged fuel oil heaters c. Ineffective straining of fuel oil d. Low fuel service pump discharge pressure (a if single) 208)In refrigeration system vegetable room n meat room r maintained at different a. Different expansion b. By putting solenoid valves
c. By boiling refrigerant at different pressures (sure) d. By using smaller evaporator 209). The best way to clean compressor impeller of an auxiliary engine turbocharger would Be:sure a. By soaking it overnight in a strong chemical solution like carbon remover or air Cooler cleaning chemical b. By chipping the dirt off the impeller blades c.By using a pneumatic wire brush d.By soaking in warm water n then cleaning it gently by rags. 210). For any p/p max.theoretical lift a. 10.5 ft b. 10.2 mtr. C. 10.5 mtr d. 12.0 mtr e. none (mcgeorge given 10.3m) 211).The gland of main sea water pump was leaking badily. U hv renewed all d packing Using packings of correct size n specification. After starting pump, u see that the pump Gland is still leaking badly n doesn’t stop even afater tightening of gland. What is d mos probable cause..????majority a. The packings used r duplicate n should b replaced with original b. The cooling warer supply to lantern ring is clogged c. There is some scale formation on the shaft in way of gland packings d. The shaft sleeve is scored n needs replacement. (discuss) 212)desludging seq for pfr??? A stop feed- give sealing water- close sealing wat- shut operating water- open and close desludging wat quickly B stop feed-shut operating water- open and close desludging water quickly C shut operating water- stop feed- open seal water for short tym- close open and close desludging water D shut operating water- stop feed- open and close desludging water quickly. (sure) Few more 213)with reference to data logger for a refer system which of the following parameters shud b monitored? A sw temp and pr B condensing temp C refrigerant leakage D evaporating temp (abd)
214) march globe vv in operation. It is seen that the gland packing is leaking, when vv is in throttled condition, tightening of gland packing doesn’t stop the leakage. Wats the reason??? A vv spindle was badly scored in a way gland packing while throttled. While movement of the spindle cause smooth portion of vv spindle to cm in a way of packing thus stop leak. B vv spindle was bent and eccentric of spindle in way of gland packing decreased while vv was opened completely thus provide better seal in gud posn C almost all globe vv are designed with back seat and spindleseat itself on the back seat when fully open thus packing stopped leakage D leakage sometimes just stops and it has nothing to do with any of the above q. (majority) 215)in ac room ppl complained of being too cool the problem might b A relative humidity high B air velocity low C heater failure to cut out at proper temp D RH low (majority) 216)MARCH MEP 2013 Purpose of balancing hole on single entry enclosed type impeller of cf p/p a)static balancing of imeller b) dynamic balancing of impeller c) balance out axial thrust on the impeller & hence the shaft d)to reduce weight of impeller at the same time of dynamic balancing the complte rotating assembly (www.jensenengineeredsystems.com/thrust-balancing/) 217)The process of depositing zinc on steel surfaces by diffusion coating is known as : A.Sherardising B. Chromising C. Calorising D. Galvanising ( Sherardising or sherardizing is a method of galvanising also called vapour galvanising. It is named for its discoverer Sherard Cowper-Coles (1900).[1] Zinc evaporates and diffuses into the metal target object forming Zn-Fe-phases by heating the object in an airtight container with zinc powder. The temperature that the container reaches normally does not exceed the melting point of zinc. Another method of sherardisation is to expose the intended objects to vapour from molten zinc using a reducing gas to prevent oxidation. option A) 218)Types of corrosion in fresh water of D/E a. Stress b. Hot corrosion
c. bimetallic d. selective phase corrosion 219)Primary advantage of central cooling sys is A more simplified cooling ckt B most part of the clg sys being fresh water based, corrosion is minimized C it allows better control of temp.by using fewer cntrollers D all of the above. (www.marineinsight.com/tech/auxillary-machinery/general-overview-of-coolingsystem-on-ships/) 220) which of the following is false statement abt galvanic corrosion? A metals close to anodic end of the series corrode in pref to those near cathodic end B when single metal exist in the sys galvanic corrosion doesn’t take place C zn is anodic to steel and used as a protective coating D corrosion rate is affected by temp. 221)Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why? A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected B. Chromium plating provides corrosion protection as well as high glo nssiness and high hardness for better wear resistance and reduced friction to the steel surfaces C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant 221)which of the follo is requirement for proper functnin of sacrificial anode sys? A good insulatn betnanodes and ships hull B good electrical continuity betn anode and ships hull C providing protection of anodes from being painted over during hull painting D presence of an insulating material betn anode and cathode. (majority) Cavitation affects disch pr, pp power, pp revolutions. 222)Double entry impellers have advantage over single entry impeller. Wat is it? A they balance out axial thrust B it gives a higher pumping efficiency C it is cheaper and easier to manufacture D the need of installing line brg onto the pp shaft is eliminated. 223)impingement corrosion can be best avoided during pipeline sys design by A keeping flow velocities to a min B keeping fluid temp low
C avoiding conditions leading to cavitation and turbulence D keeping working pressures high in the system. 224) HSS are A high carbon steels with suitably added alloying elements B medium carbon steels with suitably added alloying elements C low carbon steels with suitably added alloying elements D none of the above (majority) 225) nr vv of msw pp is leaking in closed position. U have a return type of vv onboard of same dimension. What wil u do? A do nothing and run same pp order for a new one. B replace and run the same pp keeping the other stby until new vv arrives. C put blank on the vv and run other pp. ) which of the following options give u the correct sequence of the metal/alloys in decreasing order of preferential corrosion? A stainless steel, naval brass, al bronze, cu B al bronze, cupronickel, monel metal, titanium. C stainless steel, cupronickel, naval brass, monel metal D st. steel, cu, naval brass, al bronze. 18. Corrosion of mild steel can b effectively prevented by A) Cathodic protection B) Protective coatings C) Addition of suitable alloying elements 1.Which of the group of method are used for priming of centrifugal pumps onboard ships? A. Gravity tank, attached vacuum pump B. Attached Vacuum pump, filling pump casing using a fresh water hose C. Central priming system, attached vacuum pump, sea water priming D. None of the above Which of the following instruments measures propeller drop? A. Poker Gauge B. Telescopic feeler gauge C. Trammel D. Propeller drop gauge
centrifugal pump will typically give you a low flow rate at a lower pressure, where a piston pump will give you more pressure and higher flow rate. Is the statement correct? A. TRUE
B. FALSE C. First Sentence is right. Second one is wrong D. I Don't know
1.Which of the following types of damages are metal seatings of a valve subject to?Choose the correct alternative. A. Corrosion, Erosion, Abrasion, Deformation B. Corrosion, Fatigue failure, brittle fracture, caustic cracking C. Erosion, caustic cracking, brittle fracture, Cloverleafing D. None of the above
The process of depositing zinc on steel surfaces by diffusion coating is known as : A. Sherardising Sherardising or sherardizing is a method of galvanising also called vapour galvanising. It is named for its discoverer Sherard Cowper-Coles (1900).[1] Zinc evaporates and diffuses into the metal target object forming Zn-Fe-phases by heating the object in an airtight container with zinc powder. The temperature that the container reaches normally does not exceed the melting point of zinc. Another method of sherardisation is to expose the intended objects to vapour from molten zinc using a reducing gas to prevent oxidation
B. Chromising Chromising is used for all kind of steel parts subject to high temperatures (valves for internal combustion engines, forging and extrusion tools, etc.) The hardness obtained depends on the content of carbon of the substrate (> 0,6%, good hardness). C. Calorising Calorising is a metallurgical process for treating the Process quality is monitored by testing coupons ( of surface of steels, stainless steels and alloys, with the same grade of metal) that are run in the retort with aluminium that provides protection against elevated- the production materials. The nature of the process, temperature, scaling and corrosion. the air-tight retorts and the controlled atmospheres ensure uniform alloy protection over the entire surface D. Galvanising Galvanization (or galvanisation) is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. The term is derived from the name of Italian scientist Luigi Galvani. Although galvanization can be done with electrochemical and electrodeposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc.
Bronze is an alloy typically consisting of :A. Copper , lead & tin B. Copper , Zinc & lead C. Copper , Zinc & Tin D. Copper , Tin & Lead
A refrigerant compressor will run continuously when there is A. Too heavy cooling load on the system B. Air in the system C. Insufficient refrigerant in the system D. Any of the above
Copper tubing is used in Refrigerant system because A. It has less internal resistance B. It is cheaper compared to other materials C. It is easier to check leaks in copper based system D. None of the above Which of the following is a true statement ? (choose more than one option if true) A. Mild steel will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte B. Stainless steel will be subject to preferential corrosion when in electrical continuity with Mild steel in presence of an electrolyte C. Copper will be subject to preferential corrosion when in electrical continuity with Mild steel in presence of an electrolyte D. Zinc will be subject to preferential corrosion when in electrical continuity with Aluminium in presence of an electrolyte Motor stator winding badly contaminated by dirt, oil and grease should be cleaned by: A. High pressure compressed air B. Suction or vacuum cleaning C. Brushing, spraying or immersion in an approved cleaning solvent D. Immersion in fresh water followed by drying
Aluminium being lower than zinc in Galvanic series provides lesser protection to steel compared to the zinc coating . Which one of the following is a true statement : A. Aluminium coating provides good corrosion protection compared that of zinc at elevated temperatures B. Zinc is always preferred over aluminium coating irrespective of the temperature of metal surface C. Aluminium is never used as coating material D. Aluminium reacts with steel , so cannot be used for coating steel
Which of the following statements is False about hydraulic jacks/tensioning tools? A. The piston of the jack should be turned back by a certain degree after hand tightening to prevent easy removal after un tightening of the nut. B. The piston of the jack should not be turned back after hand tightening during un tightening of the nut C. The piston of the jack need not be turned back during tightening of the nut. D. The hydraulic pressure need not be relieved during removal of the jack
Which of the following can lead to premature failure of roller bearings? A. Misalignment B. Contamination C. Shrinkage D. Over greasing 5. You as a fourth engineer have taken over watch from third engineer. He said OWS is running in 0 ppm. But after taking over watch you observed that fresh water flushing valve is crack open. After closing it, suddenly the oil content has exceeded 15ppm. What will you do? a. shut the OWS & inform CEO. b. shut the OWS but no need to inform anyone. c. Don't touch the appratus & inform CEO. d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone. 8. When running TWO centrifugal Pumps in parallel, Flow rate "Q" is i ncreased. A. TRUE B. False C. May Be D. I Don't know 9. In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel? A. Spalling B. Cracking C. Shrinkage cracking D. Slagging 15. Which of the following statements is False about cleanliness of electric motors? A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated
B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor. C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings. D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them.
20. Which one of the following is a type of corrosion :A. Electroplating B. Galvanisation C. Graphitisation D. Demulsification 21. The main disadvantages of a reciprocating pump over a Gear pump is that: A. A gear pump is self priming while a reciprocating pump is not B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed C. The discharge of reciprocating pump is pulsating and discharge rate is lesser D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used
7 maintaining correct discharge pressure, soon ceases to discharge water what are possible cause? A. Pressure gauge wrong B. Pump sucking air C. Discharge valve throttled D. Casing wear ring is worn 10 Refer cooling tubes act as self-cooling & expansion by a) Straight tube b) U tube c) Spring tube 11 . How is manual desludging carried out if automatic fails in purifier? hat will be your first step of action?
3. Main engine lube oil pump immersed is a centrifugal pump (reasons) 4. Fresh water generator condenser sea water temp increases. What r the possible reasons? 6.Purifier not rotating wid desired rpm. reason a. frequency low b.busbar voltage low c. friction pads worn out
How to remove corroded screw,bolt,nut that are stuck. 3- brass 70cu & 30 Zn/bronze – 88copper + 12 tin /gunmetal 88 cu + 10 tin + 2 Zn composition
4- sherardising chromising clarising are methods of protection from corrosion by which method, a)electroplating b)galvanisation c)metal diffusion d)cladding
Electroplating is a plating process in which metal ions in a solution are moved by an electric field to coat an electrode. The process uses electricalcurrent to reduce cations of a desired material from a solution and coat a conductive object with a thin layer of the material, such as a metal. Electroplating is primarily used for depositing a layer of material to bestow a desired property (e.g., abrasion and wear resistance, corrosion protection,lubricity, aesthetic qualities, etc.) to a surface that otherwise lacks that property. Another application uses electroplating to build up thickness on undersized parts. Galvanization (or galvanisation) is the process of applying a protective zinc coating to steel or iron, in order to prevent rusting. The term is derived from the name of Italian scientist Luigi Galvani. Although galvanization can be done with electrochemical and electrodeposition processes, the most common method in current use is hot-dip galvanization, in which steel parts are submerged in a bath of molten zinc. Metal diffusion bonds include Cu-Cu, Al-Al, Au-Au and others metallurgies that enable better hermeticity than traditional glass frit and anodic bonds. In addition, the use of metal diffusion bonds in 3D applications allows the mechanical and electrical connections to be made between two wafers in one step. Metal diffusion also enables superior post bond alignment accuracy over glass frit bonding. Aluminum metallization is used frequently in MEMS device structures and offers the potential to serve as a sealing metallurgy during device packaging steps via a diffusion reaction. Cladding is the covering of one material with another. Cladding is the bonding together of dissimilar metals. It is different from fusion welding or gluing as a method to fasten the metals together. Cladding is often achieved by extruding two metals through a die as well as pressing or rolling sheets together under high pressure.
8) Pump driven type clutch attached to vacuum pump r commonly used for
priming ballast pump n emergency fir pump. What is the factor which clutches the vacuum pump to pump the clutch during start of the pump. A) Low suction pressure acting against the spring loaded clutching piston B) High suction pressure actiong against the spring loaded clutching piston C) Low discharge pressure acting against the spring loaded clutching piston D) High discharge pressure acting against the spring loaded clutching piston 19. U hv to dismantle a F.O. heater for cleaning . U hv closed both inlet n outlet valves of the heater, both for F.O. n steam side. What wl U do before u start opening the heater? A) There is nothing more to b done, if u know the valves r holding u can straight away start opening the heater without wasting time. B) Drain the heater till pressure gauge reads zero n then start opening the heater. C) Drain the heater till F.O. stops coming out of the drain n then start opening) the heater. D) First open the vent valve n allow the heater to depressurize. N then open the drain valve to drain the contents of the heater. Composition of Brass,Bronze,Aluminium Bronze brass- copper+zinc , bronze-copper+tin(88copper + 12 tin), aluminium bronzebronze wid aluminium as parent metal gun metal is copper,zinc nd tin 88 copper 10 tin nd 2 zinc brass- 70 copper nd 30 zinc COATING IN WELDING ROD flux:aluminium oxide,sodium oxide,calcium oxide
5. Which of the following valves cannot prevent backflow of liquid in a pipeline?B OR D A. Gate valve B. Globe Check Valve C. Swing Check Valve D. Angle check valve
The flow rate through a F.O. transfer pump will not be affected by which of the following factors? A. Low F.O. temperature B. Low sounding in F.O. tank C. Internal leakage within the pump D. Leaking discharge valve Which of the following can lead to short cycling or frequent cutting in and cutting out of a fridge compressor? A. Dirty condenser B. Air entrapped in refrigerant
C. High cooling water temperature D. Grossly insufficient charge 1.In a Parallel-Gate type valve the sealing between the valve and the disc is provided by: A. Appropriate tightening torque of the valve spindle B. Gate and valve seat have a taper and when tightened they will seal against each other C. Either the seat or the disc Gate are free-floating, allowing upstream pressure to seal the seat and disc against any unwanted leakage D. For a gate type valve the sealing is never perfect and they always allow some leakage
1.A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing? 1. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause? A. Pump suction filter cover gasket leaking B. Suction filter cover gasket of one of the Bilge wells is leaking C. Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve D. Bilge pump suction pipeline leaking between the manifold and the pump
In shell and plate type coolers, due to improper flow design or partial blockage of tubes may lead to high turbulence locally. This condition may lead to (choose the best alternatives): A. Bimetallic corrosion B. Selective phase corrosion
C. Erosion D. Impingement corrosion Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of _________ type A. Bevel Gear B. Rack & Pinion Gear C. Planetary Gear D. Worm & Worm Wheel
2 What to check if Engine is not taking load.? a. Water tightness to be checked. b. Air to be removed from jacket water outlet line. c. Priming lube oil pump to run before starting the engine. d. Check the lube oil level. e. Check the flow of lube oil. f. Blow through the engine before starting. all d above things shd b checked
3.How to change purifier to clarifier.? ans: Remove the gravity disc. Provide valve on water side and put a senser on clean oil side
6. Graphitisation is the term used to describe: a) Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite b) Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to loss of strength c) Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion d) Chemical reaction between pure graphite and iron so as to increase the graphite content of iron under graphitisation, C I ,iron will be corroded leaving behind a soft graphite,will loose iitz strength and it will crack
Correct method of greasing a centrifugal pump bearing is: A. To pump the grease until you feel high back pressure on the Grease pump B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug,until all the old grease is removed and
new grease starts coming out of the drain, repeating samefor each bearing. the drain plug should then be replaced 9. After over hauling reciprocal pump the motor connections were wrongly given. Determine outcome when pump is started? A) The direction of flow will remain unaffected B) the direction of flow will be reversed C) The pump will get damaged because the suction valve will block the reverse flow causing overpressure leading to pump breakdown. D) The pump will lose suction N there will be no flow.
58.Dezincifi….removal of zinc frm brass.. 59.Addition of alu…calorising.. 60.Carbonizing or case hardening-graphite atmosphere..adding carbon.. 61.Chromising-addition of chromium coating.. 62.Which s not corrosion…coppering.. 65.Coating n welding rod…carbonates nd silicates… 66.Sw pump air leak gland packin –scoring 67.v/v seats 2 seats-gate nd ball.. 68.rotating type….butterfly,ball 69.brass- copper zinc, bronze- copper tin, aluminium bronze?? its given aluminium bronze Gunmetal - Copper, Zinc and tin
78.As per the Indian Merchant Shipping Act, 1958, which of the following statements about ownership of Indian Flag ships is False? A. A company or body established by or under any Central or State Act, which has its principal business in India, may be registered as owner by its name B. Joint owners shall be considered as constituting one person C. A person can be registered as owner of a fractional part of a share in a ship, the number of shares being ten D. Not more than the names of Ten individuals shall be entitled to registered at the same time as joint owners of any one ship
80.with ref to centrifugal p/p characteristics curves what will be the effect when p/p is started A.with suction closed b.with discharge shut: pump will churn the liquid and dishrge pressure will be only slightly higher then max pressure.... qith suction close... impeller may get damaged,shaft seal will also get heat up.. 81.how will u know ballast p/p taking good suction or not?.. how will u check....such us pressure gage...suction n discharge pressure...or throttling the suction and discharge...any change in suction n discharge pressure etc..pls say the best...way to find..
82.wat is 10% of accumulatn pr rule of safety vv given in flanagan book(boilers)?? at wat pr safety vvshould lift and hw much pr it should relieve?? Top of Form take suff amt of water. Shut all steam outlets. Bypass hp cut out. Start firing at max mode. Pr will rise. Safety v/v will lift. Note time n pr of d lifting of d safety v/v. Continue firing. 7 mins fr wt blr and 15 fr st blr. In dis period pr shld nt rise more than 10% of working pr
89) VESSEL IS AT DRYDOCK , WHO ISSUE HOT WORK PERMIT…??? Options were A.CE, B.2E, C.shipyard engineer, or D.ship superitendendent.. 97.where boiling point temp high......options are a) riser b)superheater c)primary steam drum d)secondary steam drum
98.which of the following valves are liable to open/close under the influence of fluid pressure if not in locked position? a) GATE VALVE b) GLOBE VALVE c) PLUG VALVE d) BUTTERFLY VALVE
102.Wht are the values of Max Pressure (P Max) and Mean Effective Pressure (MEP) in the two stroke and 4 stroke engines? Any Idea guys? Top of Form BMEP typical values Naturally aspirated spark-ignition engines : Maximum BMEP in the range 8.5 to 10.5 bar (850 to 1050 kPa; 125 to 150 lbf/in2), at the engine speed where maximum torque is obtained. At rated power, bmep values are typically 10 to 15% lower.[2] Boosted spark ignition engines : Maximum BMEP in the 12.5 to 17 bar range (1.25 to 1.7 MPa; 180 to
250 lbf/in2).[3] Naturally aspirated four-stroke diesels: Maximum BMEP in the 7 to 9 bar range (700 to 900 kPa; 100 to 130 lbf/in2).[4] Boosted automotive four-stroke diesels : Maximum BMEP in the 14 to 18 bar (1.4 to 1.8 MPa; 200 to 269 lbf/in2) range. Two-stroke diesels have comparable values, but very large low speed diesels like the Wärtsilä- Sulzer RTA96-C can run at BMEPs of up to 19 bar (1.9 MPa; 275 lbf/in2). Ultra boosted engines such as the engine used in the Koenigsegg Agera can run at BMEPs as high as 28 bar Top Fuel dragster engines: 80–100 bar (8.0-10 MPa)
103.which type of valve is not rotating type.... a) gate v/v b)butterfly v/v c)ball v/v d)plug v/v
104.hw much is fresh water allowance????? a)5tpc b)10tpc c)20tpc d)40tpc 139.steel contains carbon content • Less than 1% • Lessthan 2% • Greater than 2% • Can be any amont
140.Steel with .5 % carbon has • Extremely well weldiability • Good weldiability • Poor Carbon equivalent (CE) Weldability Up to 0.35 Excellent 0.36–0.40 Very good 0.41–0.45 Good 0.46–0.50 Fair Over 0.50 Poor 145.How to change suction and discharge of a reciprocating p/p a.change direction of p/p rptation b. change suction and discharge v/v 146. Multistaging of cent. p/p is for • Increasing head • Increasing flowrate
