Q1. A. Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil at outlet of the cooler and; B. Explain why air supplied to a pneumatic control system must be free from dust and water; C. Describe how above impurities are removed; D. State the possible consequences if the air supply is contaminated.
Q2. A. Discuss the possible reasons for the following changes in boiler water test results, and state what actions should be taken in each case: 1. Reduction in total dissolved solids and chemical reserves 2. Reduction in phosphate reserve, with increase in chlorides and total dissolved solids. 3. Reduction in alkalinity levels only. B. State why the complete results of boiler tests are logged or entered into a data retrieval system rather than a note being made of any particular result which may be outside set limits.
Q7. Briefly describe your action plan on following exigencies:
A. Leaky economizer tube, while at sea;
B. Leaky intercooler of main air compressor, while manoeuvring.
Q4. Discuss the validity of EACH of the following statements with respect to large slow speed diesel engines: A. Bearing clearances obtained by taking leads (or use of plastic inserts) are fundamentally more accurate than those obtained with the use of feelers;
B. Bearing wear down can be measured by taking deflections; C. A timing chain should be renewed when its slackness causes late fuel injection and exhaust valve operation; D. Timing chain slackness is solely due to stretch of the link plates.
Q9. During normal engine operation, a turbocharger rapidly loses speed and the speed reduction is accompanied by appreciable noise -
A. State with reasons the possible causes.
B. Explain in detail how the engine might be safely operated if the damage caused by this incident is such that the turbocharger cannot function.
C. State with reasons the factors which may limit engine operating speed with the turbocharger out of operation.
Q6. A completely new unit comprising piston, rings, liners, cylinder head and valves was fitted to a six-cylinder single-acting four-stroke diesel generator. Before installing the clearance and sizes were checked and considered satisfactory. During a trial run the running characteristics were abnormal so the generator was stopped. On examination, it was seen that the new piston had badly scored and drubbed the liner and had indication of seizure in the upper part of the liner. Give your reasoned comments for this failure.
Q6. You have opened up a main sea-water circulating pump (centrifugal type) onboard your vessel for examination and overhaul, describe the checks you would make, and state your conclusion regarding any faults found.
Q8: Boiler automatic combustion control has failed during operation of boiler. Explain: A. Procedures to operate boiler in emergency. B. Action plan to investigate, rectify and bring system to normal boiler operation.
Q9. With reference to refrigeration system on board ship, enumerate the following: - A. Consequence of lubrication oil pressure low; B. Procedure for charging the system; C. Charging of shaft seal of a compressor; D. Reason of ice formation on the return line.
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