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Q1. A). Describe the procedure for opening a bottom end bearing for inspection making reference to the positioning of the crank and the safety precautions to be observed.

B). State how the bearing clearance may be checked and adjusted when necessary

C). State TWO defects, which may be encountered during inspection of the bottom end bearing and crankpin giving possible causes of EACH.

D). State TWO checks, which should be made before returning the engine to service following overhaul of the bottom end bearing.

Q7. With reference to lifeboats, Sketch and describe:

A.  The handbrake used for lowering and state how it may be tested.

B. The centrifugal brake and method of testing.

C. A roller ratchet and the method of testing;

D. Why is ratchet incorporated into the system;

Q5. With reference to air receivers and bottles explain with reasons: A. Why regular systematic internal inspection is advisable? B. Which internal areas of large receivers should receive particularly close examination? C. How bottles are inspected internally and what parts should be closely examined? D. How the condition of a bottle or receiver that cannot be inspected internally is checked?

Q8. Explain how EACH of the following hull defects should be dealt with;

(a) A cracked weld;

(b) A severe indentation in way of a frame;

(c) Surfaces suffering from general corrosion although the extent of wastage does not warrant plate replacement;

(d) A bilge keel fractured at the forward end.

Q4. Discuss the advantages and disadvantages of adopting the following policies for maintenance of main and auxiliary diesel engines. A. Planned maintenance; B. Condition monitoring; C. Periodic replacement of components. D. Break down maintenance

Q3. (a) With the aid of a simple sketch, explain the “trouble spots” in a basic air-conditioning unit and with reference to your sketch, explain the following: -

(a). How the problem of increase in humidity of cooled air is overcome?

(b). How discomfort caused by the excessive drying effect of heated air is overcome?

Q1: Describe how the following conditions are prevented in auxiliary boilers:

A. Feed contamination by oil from heating coil drains.

B. Internal corrosion.

C. Furnace blowback.

D. Uptake fire.

Q3: Your ship after having been accidentally grounded was taken to a dry-dock for inspection and necessary repairs. What defects would you look for in the following parts, that may have sustained damage due to grounding and suggest methods of repairs and tests that may be required to be carried out to the defects noticed:

A. Propeller and tail end shaft.

B. Main engine crankshaft.

Q9. A. State the circumstances leading to renewal of cylinder liner of 2S slow speed propulsion engine. B. Explain the procedure for removing the liner. C. Explain the procedure for fitting new liner. State the important checks made after fitting.