Q1. Suggest a procedure (in about 200 words) to the Chief Engineer, as to how you propose to ensure that the engine room overhead crane is maintained and operated correctly. What tests certificates are required for the overhead crane, and who is the issuing authority.
Q6. A. Describe the survey procedure of an oil lubricated stern bearing and shaft. (8)
B. Explain how the integrity of the outboard seal of an oil lubricated stern tube may be proved before the dry-dock is flooded. (8)
Q7. Fatigue is one of the main causes of crankshaft failure - A. Indicate on a sketch the most likely location of a fatigue crack; B. Explain how a fatigue failure is identified; C. Describe how a fatigue crack may be initiated; D. Describe, with the aid of sketches, the methods used to inhibit fatigue cracks.
Q9. What are the effects of following on the sluggishness of steering gear operations;
A. Air entrapped in hydraulic oil;
B. Worn pins and weak springs in hunting gear;
C. Shock valves leaking
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.
Q7. It is found that the tie rods are persistently becoming slack: A. State, with reasons, the possible causes; B. State, with reasons, the likely effects on the engine if it is allowed to operate with slack tie rods; C. Explain how this problem can be minimized?
Q9. A. State the common causes of scavenges fires; B. List the indications that a scavenge fire is in progress; C. State the immediate action to be taken in the event of a scavenge fire; D. List with reasons the checks and precautions necessary before an engine is put back into service following a scavenge fire.
Q9. A. Explain how oil carries over occurs in starting air compressors; B. State how the problems of oil carry over are minimized; C. State THREE factors that contribute to air start line explosions in diesel engines.
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