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Question Bank IC Engine & Gas Turbine
(ME 601)
th
Discipline: Discipline : ME Course: B-Tech B-Tec h Semester: 6 Faculty: Dr. A. Kundu and Dr. P.K. Pal
GROUP-A Multiple type questions
1. Commonly used injection system in automobile is a) a ir injection b) solid injection c) co (a) and (b) d) none of these. 2. The ratio of brake power to indicated power of an I.C.Engine is called a) mechanical e thermal efficiency c) volumetric efficiency d) relative efficiency. 3. For same compression ratio a) thermal efficiency of Otto cycle is less than that of Die thermal efficiency of Otto cycle is greater than that of Diesel cycle c) thermal efficie cycle is same as that of Diesel cycle d) thermal efficiency of Otto cycle cannot be predict 4. Anti-knock property of C.I.engine fuel can be improved by adding a) tetraethyl lead pentane c) amyl nitrate d) hexadecane. 5. For economy (minimum fuel consumption), the air-fuel ratio for petrol engine is of the 9:1 b) 12:1 c) 16:1 d) 18:1. 6. Supercharging of I.C.engine is essential for a) marine engine b) aircraft engine c) statio d) none of these. 7. Advantages of reciprocating IC engines over steam turbine is a) mechanical simplicity b plant efficiency c) lower average temperature d) all of the above. above. 8. Compression ratio in Diesel engines is of the order of a) 5 -7 b) 7-10 c) 10-12 d) 14-20. 9. Thermal efficiency of C.I engine is higher than that of S.I.engine due to a) fuel use compression ratio c) constant pressure heat addition d) none of the above. 10. Main advantage of a two-stroke engine over four-stroke engine is a) more uniform to crankshaft b) more power output for the cylinder of same dimensions c) absence of valv the above. 11. With dissociation peak temperature is obtained a) at the stoichiometric air-fuel ratio b mixture is slightly lean c) when the mixture is slightly rich d)Free none of30 theDays above. Read For Sign up to vote on this title 12. With dissociation the exhaust gas temperature a) decreases b) increases c) no effectd) in Useful Not useful Cancel anytime. certain air-fuel ratio and then decreases Special offer for students: Only $4.99/month. 13. Fuel-air ratio affects maximum power output of the engine due to a) higher specif chemical equilibrium losses c) both (a) and (b) d) none of the above.
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20. For a four cylinder vertical engine, the commonly used firing order is a) 1-2-3-4 b) 3-4-1 2 d) 4-3-2-1 21. Battery ignition system a) occupies more space b) has more maintenance problem c) is employed in four wheelers d) all of the above. 22. For engine operating with rich mixtures the optimum spark timing a) must be advanced retarded c) must be at TDC d) none of the above. 23. Consider the following statements: 1. In the SI engines detonation occurs near the end of whereas in CI engines knocking occurs near the beginning of combustion 2. In SI problem are encountered on accounts of preignition 3. Low inlet pressure and tempera knocking tendency in SI engines but increases the knocking tendency in CI engines. W statements given below are correct? A)1,2 & 3 b) only 1 & 2 c) only 2 & 3 d) only 1 & 3. 24. The delay period in CI engine depends upon which of the following? a) temperature and the cylinder at the time of injection b) nature of the fuel mixture strength c) relative veloc the fuel injection and air turbulence pressure of residual gases d) all of the above. (IES-20 25. In a Morse test a 2-cylinder, 2-stroke, spark ignition engine, the brake power was 9 kW brake powers of individual cylinders with spark cut were 4.25 kW and 3.75kW respe mechanical efficiency of the engine is a) 90% b) 80% c) 45.5% d) 52.5%. (IES-1999) 26. Consider the following statements: In order to prevent detonation in a spark ignition charge away from the spark plug should have 1. Low temperature 2. Low density 3. Lo delay. Which of the statements given below is/are correct? a) only 1 b) only 2 c) only 3.(IES-2006) 27. Thermal efficiency varies a) inversely as sfc b) directly as sfc c) as square as sfc d) as roo 28. Mechanical efficiency is ratio of a) f p to b p b) f p to i p c) b p to i p d) i p to f p. 29. If N is the rpm, number of power strokes per minute in a four-stroke engine is a) 2N b) 4N. You're a Preview 30. Volumetric efficiency is a measure of a)Reading speed of the engine b) power of the engine capacity of the engine d) pressure rise in the cylinder. Unlock full access with a free trial. 31. The volumetric efficiency of a well designed engine is in the range a) 30 to 40% b) 40 to to 70% d) 75 to 90% Trial 32. Supercharging increases the powerDownload output ofWith the Free engine by a) increasing the charge tem increasing the charge pressure c) increasing the speed of the engine d) quantity of fuel ad 33. Supercharging air compressor is driven by a) exhaust gas turbine b) engine itself electrical motor d) none of the above. 34. Volumetric efficiency of supercharged engine is a) between 90 – 100% b) between 8 between 100 – 110% d) between 70 – 80%. 35. Stoichiometric air-fuel ratio of petrol is roughly a) 50:1 b) 25:1 c) 15:1 d) 1:1 36. Venturi in the carburetor results in a) decrease of air velocity b) increase of air velocity Read Free Foron 30this Days Sign up to vote title of fuel flow d) increase of manifold vacuum. Useful Not useful 37. The choke is closed when the engine is a) accelerating b) hot c) cold d) idling. Cancel anytime. 38. air Only mixture is required during a) idling b) starting c) acce lerating d) cruising. Special offer forLean students: $4.99/month. 39. During starting petrol engines require a) stoichiometric mixture b) lean mixture c) rich
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43. Knocking in the SI engine decreases in which one of the following orders of combusti design a) F head, L head, I head b) T head, L head, F head c) I head, T head, F head d head, Thead. (IES-1995) 44. The two reference fuels used for cetane rating are a) cetane and isooctane b) cetane an lead c) cetane and n-heptane d) cet ane and α– methyl naphthalene. (IES-1995) 45. The method of determination of indicated power of multicylinder SI engine is by the use test b) prony brake test c) Heat balance test (IES-1995). 46. Assertion (A): A very high compression ratio is favoured for a CI engine, in order to mechanical efficiency without knocking. Reason (R): The delay period in CI combustio of pressure rise and hence knocking. a) both A and R are individually true and R is explanation of A b) Both A and R are true but R is not the correct explanation of A c) A i is false d) A is false but R is true.(IES-1996) 47. Assertion (A): Pre-chamber Diesel engines use higher injection pressure when compa combustion chamber engines. Reason (R): Pre-chamber engines have higher compressio a) both A and R are individually true and R is the correct explanation of A b) Both A an but R is not the correct explanation of A c) A is true but R is false d) A is false but R 1997) 48. Assertion (A): One of the important requirements of carburetor is the supply of lean starting. Reason (R): A rather lean mixture is required at no-load and low-load opera engine. a) both A and R are individually true and R is the correct explanation of A b) Bo are true but R is not the correct explanation of A c) A is true but R is false d) A is fal true.(IES-1997) 49. Assertion (A): The CI engine is basically more suitable for supercharging than the Reason (R): In the CI engine supercharging tends to prevent Diesel knocking. a) both A individually true and R is the correct explanation of A b) Both A and R are true but R You're correct explanation of A c) A is true but RReading is falsead)Preview A is false but R is true.(IES-2000) 50. Disadvantages of reciprocating IC engine are a) vibration b) use of fossil fuels c) balancin Unlock full access with a free trial. d) all of these. 51. In a four-stroke IC engine cam shaft rotates at a) same speed as crankshaft b) twice t Download With of Free Trial crankshaft c) half the speed of crankshaft d) none these. 52. If L is the stroke and N is the rpm, mean piston speed of two-stroke engine is a) LN b) L d) none of these. 53. Equivalence ratio is a) actual fuel-air ratio / Stoichiometric fuel-air ratio b) Stoichiom ratio / actual fuel-air ratio c) Stoichiometric fuel-air ratio / actual air-fuel ratio d) actual / Stoichiometric fuel-air ratio. 54. In a reciprocating engine with a cylinder diameter of D and stroke of L, the cylinder volu / 4)D2L x clearance volume b) ( π / 4)D 2L - clearance volume c) ( π / 4)D 2L + clearance 2 Read Free Foron 30this Days Sign up to vote title π / 4)D L ÷ clearance volume. useful 55. Frictional power is given by a) f p = i p + b p b) f p = i p / b p c) Useful f p = i p x b pNot d) f p = i p - b p. Cancel anytime. 56. specific fuel consumption is defined as a) fuel consumption per hour b) fuel consu Special offer forBrake students: Only $4.99/month. km c) fuel consumption per bp d) fuel consumption per brake power hour.
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64. Brayton cycle is used in a) SI engine b) CI engine c) st eam engine d) gas turbine. 65. Knocking takes place in CI engines a) at the start of combustion b) at the end of co during combustion d) none of these. 66. Cetane number is the measure of a) antiknock quality of Diesel fuel b) antiknock quality c) auto-ignition temperature d) calorific value of fuel. 67. In a four stroke engine, the working cycle is completed in a) one revolution of the crank revolution of the crank shaft c) three revolution of the crank shaft d) four revolution o shaft. 68. The thermodynamic cycle on which gasoline engine works, is a) Otto cycle b) Jo ule cycle cycle d) Stirling cycle. 69. The theoretically correct mixture of air and petro l is a) 10:1 b) 15:1 c) 20:1 d) 25:1. 70. A petrol engine has compression ratio from a) 6 to 10 b) 10 to 15 c) 15 to 25 d) 25 to 40. 71. The air and fuel ratio of the petrol engine is controlled by a) carburetor b) injector c) none of these. 72. The most perfect method of scavenging is a) cross scavenging b) uniflow scavengi scavenging d) reverse flow scavenging. 73. Detonation in SI engine occurs due to a) pre-ignition of the charge before the spark ignition of the charge before the spark c) auto ignition of the charge after the spark d) non 74. Ignition quality of Diesel engine is indicated by its a) octane number b) cetane number c) d) fire point. 75. In turbochargers compressor is a) electrically driven b) exhaust GT driven c) driven by itself d) none of these. 76. Decrease in air-fuel ratio in SI engines results in a) increase of NO x b) decrease of CO an increase of CO and UBHC d) both (a) and (c). 77. The principal surfaces requiring lubrication in an IC engine are a) cylinder head b) crank You're Reading a Preview and exhaust manifold d) all of these. 78. Advantages of fuel injection in SI engine is a) low maintenance cost b) low initial cost c Unlock full access with a free trial. volumetric efficiency d) low pollution. 79. The choke is closed when the engine is a) cruising b) hot c) idling d) cold. Download With Free 80. For the same compression ratio and heat rejection a) ηTrial Otto > η Dual > ηDiesel b) η Otto < η ηOtto > ηDiesel > ηDual d) ηDiesel > ηOtto > ηDual.
GROUP-B (Short answer type questions)
Master your semester with Scribd Read Free For 30this Days Sign up toisvote on title20:1 while a 1. Explain why a S.I. engine fails to operate if the air-fuel ratio more than & The New York Times Useful Not useful can operate on an air-fuel rat io of even 50:1? Cancel anytime.
Special offer students: Onlydifference $4.99/month. 2.forWhat is the between air-standard cycles and fuel-air cycles?
3. State the importance of fuel-air cycles. State the factors which should taken into consid
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14. Explain various factors that influence the flame speed. 15. What are the factors that limit the compression ratio that can be used in petro l engines? 16. Explain the terms and differences:(i) Pre- ignition; (ii) Auto-ignition; (iii) Detonation. 17. Abnormal combustion knock produced by surface ignition in S.I. engines is more ha normal combustion knock. Justify. 18. Discuss the effect of engine variables on ignition lag. 19. The higher compression rat io that can be used in an S.I. engine is limited by the characteristics of the fuel. Justify. 20. Why retarding of spark timing in S.I. engine reduces detonation? 21. Discuss the effect on reducing the possibility of detonation of following variables: (i) c ratio; (ii) mixture inlet temperature; (iii) mass of charge; (iv) engine speed and (v) distan travel. 22. Auto ignition is the cause of detonation. Justify. 23. On what basis are S.I. engine fuels compared when they are better than iso-octane in characteristics? 24. Discuss the basic requirements of a good S.I. engine combustion chamber. 25. Explain the phenomenon of knock in C.I. engine. Compare it w ith S.I. engine knock. 26. Explain Diesel Knock briefly. 27. How does the mixture composition in the combustion chamber of a C.I. engine differ t engine? 28. The factors that tend to increase detonation in S.I engine tend to reduce knocking in C Justify with reference to the following influencing factors: (i) compression ratio temperature; (iii) inlet pressure; ( iv) self ignition temperature; (v) lag of ignition; (vi) eng 29. Why does rate of pressure rise during combustion is limited to a certain value? 30. Discuss the influence of ignition delay on combustion process in S.I. and C.I. engines. Reading a Preview 31. Why the inlet valve be kept openYou're for a few degree of crank angles even when the pisto compression stroke? Unlock full access with a free trial. 32. Discuss on the aids used for starting C.I. engines under extreme cold climate. 33. Define volumetric efficiency of an I.C. engine. How is it related to the power output of Download Free Trial How is it affected by the speed of the engine With and altitude? 34. What are the requirements of an ignition system for an I.C. engine? 35. What is the difference between ignition timing and firing order? 36. State the functions of an ignition coil and a condenser in the battery ignition system cylinder S.I. engine. 37. Supercharging is preferred in diesel engine than petrol engine. Justify. 38. What is supercharging? Explain why supercharging is essential in aircraft engines? 39. What are the different methods used in C.I. engines to create turbulence in the mixture? Read Free Foron 30this Days Sign up to vote title effect on power output and thermal efficiency of the engine. Not carburet useful 40. With the help of a neat sketch explain the working principle of a simple tor. Useful Cancel anytime. 41. is petrol injection? State the advantages and limitations of petrol injection. Special offer forWhat students: Only $4.99/month. 42. Explain briefly the essential features of a good commercial carburettor for automotive en
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choke for a flow velocity of 100 m/s. Velocity coefficient is 0.8. If the pressure drop acr metering orifice is 0.8 of that of the choke, calculate orifice diameter assuming, C df = 0.6 2. a) What is dissociation? How does it affect power developed by the engine? Explain with a p-V diagram the loss due to variation of specific heats in an Otto cycle. b) The air-fuel ratio of a Diesel engine is 29:1. If the compression ratio is 16:1 and the tem the end of compression is 900 K, find at what cylinder volume the combustion is comple this volume as a percentage of stroke. Assume that the combustion begins at the top dead takes place at constant pressure. Take calorific value of the fuel as 42000 kJ/kg, R = 0. and Cv = (0.709+0.000028T) kJ/kgK. 3. The following details were noted in a test on a four-cylinder, four-stroke engine, diamete stroke = 120 mm; speed of the engine = 1600 rpm; fuel consumption = 0.2 kg/min; calori fuel is 44000 kJ/kg; difference in tension on either side of the brake pulley = 40 circumference is 300 cm. If the mechanical efficiency is 80%, calculate a) brake therma b) indicated thermal efficiency c) indicated mean effective pressure and d) brake consumption. 4. a) A four-stroke, four-cylinder automotive engine develops 150 Nm brake torque at 300 brake power, displacement volume, stroke and bore of the engine. Assume mean bra pressure and mean piston speed are 1 bar and 10 m/s. b) Explain the phenomenon of dissociation. Show with the help of p-V diagram dissociation in Otto cycle. c) Discuss the important qualities of S.I.engine fuels . 5. a) Explain the working of a magneto ignition system with the help of neat sketch. b) W understand by ignition timing? Discuss the various factors which effect ignition timing re c) What is angle of advance? Why is it necessary with the ignition system? d) W understand by ‘Scavenging effect’? Explain with a suitable sketch any one of the You're Reading a Preview processes 6. a) Explain briefly the stages of combustion in an S.I.engine. b) What are the factors whic Unlock full access with a free trial. delay period? C) What are the limitations of supercharging in an I.C.engine? d) What d by scavenging effect? Explain with a suitable sketch, any one of the scavenging processes WithShow, Free Trial 7. a) Explain the phenomenon of Download dissociation. with the help of p-V diagram dissociation in Otto cycle. b) What is the difference between knocking phenomenon C.I.engine? c) An Otto cycle engine having a clearance volume of 250 c.c. has a compres 8. The ratio of pressure rise at constant volume is 4. If the initial pressure is 1 bar, find w cycle and the theoretical mean effective pressure. 8. a) What is meant by abnormal combustion? Explain the phenomena of knock in SI engine b) Explain the effect of various engine variables on SI engine knock. 9. a) Bring out clearly the process of combustion in CI engines and also explain the vario Read Free Foron 30this Days Sign up to vote title combustion. Not useful b) What is delay period and what are the factors that affect the delay period? Useful Cancel anytime. 10. Special offer forExplain students: the Onlyphenomenon $4.99/month. of knock in CI engines and co mpare it with SI engine knock. 11. Explain with figures various types of combustion chambers used in SI and CI engines.
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(ii) if the engine speed is 1500 r.p.m., injection pressure is 150 bar, air pressure during in o bar, and fuel injection is carried out for 20 crank angle, determine the diameter of the fue Take ρf = 860 kg/m3, Cf = 0.67. 15. A four stroke four-cylinder spark-ignition engine having a bore of 100 mm and stroke and running at 3000 rpm has a carburetor venturi with a 35 mm throat diameter. The efficiency of the engine at this speed is 80%, the coefficient of discharge of air flow 0 ambient pressure and temperature are 1.013 bar and 25 C respectively. The air/fuel rati top of the jet is 5 mm above the petrol level in the float chamber. The coefficient of di fuel flow is 0.7. Determine the depression at the throat and the diameter of the fuel jet carburetor. The specific gravity of petrol is 0.75. 16. A petrol engine develops 8 kW brake power having brake thermal efficiency of 30% wh at the full-load condition. The calorific value of the fuel is 44,000 kJ/Kg. The suction c the engine are 1.013 bar and 300 K. The carburetor fitted on this engine has a single jet and the nozzle lip is 8 mm. Determine the venturi throat diameter of the carburetor to 3 air/fuel ratio of 15:1. Assume the following data: C da = 0.9, ρf = 750 kg/m , Cdf = 0.7, 0.8 m3/kg. 17. A four cylinder SI engine has a bore of 60 mm and a stroke of 85 mm. It runs at 3000 tested at this speed against a brake which has a torque arm of 0.35 m. The net brake lo and the fuel consumption is 6.6 litre/hr. The specific gravity of the fuel used is 0.78 lower calorific value of 44,000 KJ/kg. A morse test is carried out and the cylinders are c order 1, 2, 3, 4 with the corresponding brake loads of 114, 110, 112 and 116 N r Calculate for this speed the b p, the bmep, the brake thermal efficiency, the bsfc, mechanical efficiency, and the imep. 18. a) What are the different stages of combustion in a CI engine? b) Explain the effects of co mpression ratio and engine speed on the first stage of combu You're Reading a Preview engine. c) A four-stroke four-cylinder Diesel engine running at 2000 r.p.m. develops 60 thermal efficiency is 30% and calorific of with fuela is MJ / kg. Engine has a bore of 1 Unlock value full access free42 trial. 3 stroke of 100 mm. Take air density = 1.15 kg / m , air-fuel ratio = 15:1 and mechanical 0.8, Calculate i) fuel consumption Download (kg /s) ii) With air consumption Free Trial (kg /s) iii) indicated therma iv) volumetric efficiency v) brake mean effect ive pressure vi) mean piston speed. 19. a) What is ‘petrol injection’? Discuss the advantages and disadvantages of petrol injec over the carburetor system. b) What are the advantages and limitations of supercharging in an IC engine? c) Fuel su SI engine has a calorific value 42,000 kJ /kg. The pressure in the cylinder at 30% and compression stroke are 1.3 bar and 2.6 bar respectively. Assume that the compression law pV1.3 = constant. Find the compression ratio. If the relative efficiency of the engin with the air standard efficiency is 50%, calculate the fuel consumption in kg / kWh. Read Free Foron 30this Days Sign up to vote title en 20. a) Compute the brake mean effective pressure of a four cylinder, four stroke Diesel Useful Not useful 150 mm bore and 200 mm stroke which develops a brake power 73.6 Kw at 1200 rpm. Cancelof anytime. Special offer for b) students: Onlymean $4.99/month. Find the piston speed of a Diesel engine running at 1500 rpm. The engine bore and L /D ratio is 1.5.
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= 1.17kg / m3. Manometric water head = 197 mm. Brake drum dia. = 300 mm. Rope di mm. Brake load = 56 kg. Calculate the following: i) brake power ii) brake thermal e calorific value of Diesel is 43000 kJ / kg. iii) volumetric efficiency iv) brake mean effect v) brake specific fuel consumption. b) Explain the knocking phenomena in SI and CI e discuss the factors which reduce knocking. 24. Fuel injection in a single cylinder 4S cycle C.I. engine running at 650 r.p.m. takes pl o single orifice nozzle and occupies 28 of crank travel. The fuel consumption of the e kg/hr and the fuel used has a sp. gravity of 0.875. If injection pressure is 150 bar and the chamber pressure is 32 bar; estimate the volume of fuel injected per cycle and the diam orifice. Take Cd=0.88. 25. The following data refer to an eight cylinder 4S petrol engine: Bore = 110 mm Stroke = 110 mm Composition of the fuel used = C = 84%; H 2 = 16% Throat diameter of the choke = 42 mm Volumetric efficiency at 300 r.p.m. = 75% (at 0oC, 1.013 bar) Pressure depression = 0.12 bar o Tempearture at throat = 15 C Characteristics gas constant: for Air = 287 J/kgK for fuel vapour = 97 J/kgK If chemically correct air-fuel ratio is supplied, determine: (i) Fuel consumption in kg/hr.; (ii) The air velocity through the tube. 26. A four cylinder 4S S.I. engine has a compression ratio of 8 and bore of 100 mm, with stro bore. The volumetric efficiency of each cylinder is equal to 76%. The engine operates 4800 r.p.m. with an air-fuel ratio ofYou're 15. Reading a Preview 3 Given that the calorific value of fuel = 42 MJ/kg, atmospheric density = 1.12 kg/m , me Unlock full access with a free trial. pressure in the cylinder = 10 bar, mechanical efficiency = 80%; determine the indica efficiency and brake power. Download With Free Trial 13 kW per m 3 of free air 27. A 4S diesel engine having a capacity of 3600 c.c. develops minute. It has a volumetric efficiency of 82% at 3000 r.p.m. referred to free air conditio bar and 25 oC. This engine is supercharged by a rotary compressor which develops a pres 1.8 and has an isentropic efficiency of 75%. The compressor is coupled to main shaft o which supplies power to it. Estimate the increase in brake power due to superchargi mechanical efficiency 80% and air intake to the cylinder to be at the pressure equal to pressure from compressor and temperature equal to 4oC less than the delivery temperatu compressor, and cylinder volume contains volume of charge equal to the swept volume. Foron 30 Days Sign to vote this title 28. An unsupercharged petrol engine develops 735 kW Read withupFree air fuel ratio 12.8. The bs Not useful kg/kWh and mechanical efficiency 85%. The inlet pressure is 730 of mercury abso Useful mm Cancel anytime. o is 52 C. The engine is supercharged to a pressure ratio of 1.6 by a s Special offer formixture students: temperature Only $4.99/month. of adiabatic efficiency 70% and mechanical efficiency of 90%. Assuming that A/F ra
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Department of Mechanical en
IC Engine & Gas Turbine
(ME 601) Discipline: ME Course: B-Tech Semester: 6 Faculty: Dr. A. Kundu and Dr. P.K. Pal
th
GROUP C
1. A gas engine having a cylinder 250 mm bore and 450 mm stroke has a volumetric efficie 3 Air-gas ratio equals 9:1, calorific value of fuel 21000 KJ per m at NTP. Calculate the h to the engine per working cycle. If the compression ratio is 5:1, what is the heat value of 3 per working stroke per m of total cylinder volume? 2. Why are two strokes diesel engines, for large power, more common than two stroke petro
3. A 2.7 litre cubic capacity, six-cylinder, four-stroke Otto engine has a compression ratio engine develops 138 KW at 5000 rpm. Calculate i) air – standard efficiency; ii) the nece heat addition; iii) the mean effective pressure of the cycle; iv) the peak temperature and the cycle. 4. An Otto cycle takes in air at 300 K. The ratio of maximum to minimum temperature is the optimum compression ratio for the maximum work output of the cycle. You're Reading a Preview 5. A carburetor with float chamber vented to atmosphere is tested in a laboratory without Unlock full access a free trial. The engine is run on economy mode with anwith air-fuel ratio of 16 at 1 bar. The thro measured is 0.82 bar. The same carburetor is once again tested with air cleaner fitted o additional pressure drop due to airDownload cleaner is With 0.04 Free bar. Trial With air flow at the atmospheric c remain unchanged at 250 kg/h. Assuming same air flow in both cases and constant co flow determine i) throat pressure with air cleaner fitted ii) the air fuel ratio with air cleane 6. Show that the compression ratio for the maximum work in an Otto cycle is given by 1/[2(γ-1)] r = (T3/T1) , where T1 and T 3 are the lower and upper limits of absolute respectively. Also, prove that the intermediate temperatures for this condition are: 1/2 T2 = T4 = (T1T3) 7. The analysis of a fuel is found to be carbon 86%, hydrogen 5%, oxygen 2%, sulphur 0.5% per kg and the remainder is nitrogen. Determine the weight ofRead stoichiometric air required Free Foron 30this Days Sign up to vote title complete combustion. If the actual supply of air is 25 % in excess of this, estimatethe pe Useful Not useful Cancel anytime. dry products of combustion by weight and by volume. Special offer for students: Only $4.99/month. 8. A hydrocarbon fuel has the following composition of dry products of combustion by volu = 4%, and the rest N . Determine the air-fuel ratio, the percent th
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Department of Mechanical en
14. Assuming a volumetric efficiency of 75%, estimate the probable indicated power of a fo petrol engine, given the following data, diameter of cylinder = 180 mm; stroke = 210 m 1000 rpm; air-fuel ratio = 16:1. Engine works on a four-stroke cycle, net calorific value o 44 MJ / kg; thermal efficiency is 30%.Assume ρ a = 1.3. 15. Explain the effect of the following factors on the performance of an SI engine: i) compr ii) air-fuel ratio iii) spark timing iv) engine speed v) mass of inducted charge and vi) heat 16. A Diesel engine has a brake thermal efficiency of 30%. If the calorific value of the fuel i kg. Find its brake specific fuel consumption. 17. A certain engine at full load delivers a brake power of 36.8 kW at certain speed. It requir to overcome the friction and to rotate the engine without load at the same speed. C mechanical efficiency. Assume that the mechanical losses remain constant, what mechanical efficiency at half load and quarter load. 18. Compute the bmep of a four-cylinder, two-stroke engine, 100 mm bore, 125 mm stro develops a torque of 490 Nm. 19. A petrol engine uses a fuel of calorific value of 42000 kJ / kg and has a specific gravity o brake thermal efficiency is 24% and mechanical efficiency is 80%. If the engine deve power of 29.44 kW, calculate i) volume of the fuel consumed per second ii) indica efficiency.
You're Reading a Preview Unlock full access with a free trial. F Fi
With Free Trial 20. Refer to the figure above, what is Download the angle of overlap? What effect on volumetric effici expect if the angle of overlap is increased leaving intake opening unaltered? 21. Prove that with the increase in temperature inside the engine cylinder, for variable spec the gas or charge, thermal efficiency of the engine decreases. 22. What is the effect of mixture strength on thermal efficiency at a given compression ratio? 23. Determine the effect of percentage change in the efficiency of Otto cycle having a compr of 8, if the specific heat at constant volume increases by 10 percent. 24. State the various factors those affect the combustion in C.I. engines. Read Free Foron 30 Days Sign up to vote this title is more ri 25. The requirement of air motion and swirl in a C.I. engine combustion chamber Not useful in a S.I. engine. Explain. Useful Cancel anytime.
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