1. Question No.1 is compulsory and score of minimum 50% marks is essential in the same. 2. Answer any SIX questions. 3. All questions carry equal marks. 4. Neatness in handwriting and clarity in expression carries weightage 5. Illustration of an answer with clear sketches ? diagrams carries weightage 6. All unused pages of answer script must be cancelled out by two lines (X) across the page. Q1. With respect to refrigeration gases used on-board vessels, answer the following A. Explain ozone depleting potential of conventional refrigerant refrigerant gases B. Name the alternate refrigerant gases available and being used onboard. C. Explain the steps you will take to ensure that release of refrigerant gases from the plant is minimized during normal operation and during maintenance activities. 2013/SR1 2013/SR8 2015/SR01 2015/SR02 2015/SR09 2016/SR02 2016/SR08 2016/SR10 Q2. With respect to the steering gear, answer the following: Explain with a di agram, a “fail safe steering gear” suitable for use on a tanker of more than 100000 T dwt; B. Explain the sequence of events that take place when an oil leak takes place in one of the hydraulic pipe lines. 2013/SR1 2013/SR8 2015/SR01 2016/SR02 2016/SR10 Q3. With regard to care of lubricating oils on board answer the following – A. What is microbial degradation of lubricating oil and how is it prevented? B. What methods are employed to ensure correct sampling for shore based testing? What action will you take if the testing results show abnormal values of water content and TBN for the crankcase lub oil of a slow speed main engine? 2012/SR12 2013/SR1 2013/SR7 2014/SR08 2014/SR11 2014/SR11 2015/SR01 2015/SR02 015/SR06 2015/SR09 2016/SR02 2016/SR08 2016/SR10 2016/SR10 Q4. State with reasons how cracking in EACH of the following location is caused rectified and avoided - 1. A-frame ; 2. Bedplate longitudinal girder; 3. Bed plate transverse girder 2011/SR3 2010/SR10 2013/SR1 2016/SR02 2016/SR04 2016/SR10 Q5. Describe how you, as Second Engineer, would prepare an auxiliary boiler for survey by a classification society. 2010/SR10 2016/SR10
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Q6. With reference to feed regulation: A. Describe, with the aid of sketches, the operation of a boiler feed water regulator controlled by atleast two other parameters besides water level in the drum; B. Give reasons for the inclusion of the other elements besides water level in controlling feed flow; C. Deduce the possible effects on the system w3hen the drain valve in the constant leg in the level transmitter starts to leak. 2013/SR7 2013/SR8 2015/SR01 2016/SR02 2016/SR04 2016/SR10 Q7. Sketch a sealing arrangement for an oil lubricated stern tube. A. Identify the common form form of seal failure; B. State State how oil loss due to seal failure can be restricted restricted whist on passage; C. What material is used for sealing ring and propeller shaft liner? 2011/SR3 2010/SR10 2012/SR6 2013/SR1 2013/SR7 2016/SR02 2016/SR04 2016/SR10 Q8: A. State the laboratory tests that may be carried out on specimens of steel for ships’ plate giving giving reasons for the tests.
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B. The basic compositions of two ships’ plates are give n in Table below one is an example of modem practice whilst the other is a specification of a 1940’s tanker that split in two due to brittle fracture. Compare these two specifications critically and e xplain which of these two steels would be most resistant to brittle fracture C M Si S P AI N 0.18% 0.70% 0.30% 0.04% 0.04% 0,015% 0,005% Steel’A’ 0. 19% 0.57% 0.03% 0.029% 0.042% 0.005% 0.008% Steel “B”
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Q9. Draw a diagram of a four ram electro-hydraulic steering gear showing: 1. Pump isolating valves 2. Relief / Shock valves 3. Bypass valves B. Explain the operation of the system sketched in A C. Indicate in the diagram (A) the valve positions for the operation of the system when one pump is isolated and the unit is operating on two rams only. 2016/SR10
