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Q2. With reference to reciprocating air compressors explain the cause of the following faults.

A. Collapse of discharge valve springs;

B. Breakage of plate valves;

C. Overheating of the discharge air with an unrestricted air intake;

D. Inoperative piston rings.

Q2. What is Metal-locking? What types of repairs are carried out by metal-locking? Describe the repair procedure using Metal-Locking.

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. Explain why auxiliary engine bottom-end bolts are prone to failure, even under normal running conditions. Identify those features, incorporated into the design of bottom-end bolts, to inhibit failure. Explain how this tendency is either aggravated or inhibited during maintenance and what checks are to be carried out.

Q6. Enumerate the maintenance routines carried out for the proper functioning of the following systems:

A. Water hyper mist system   B. Smoke detection system

C. Quick closing valves                          D. Fire hydrants and hoses.

Q6. A marine diesel engine fresh water cooler end cover is badly corroded and holed. Other than replacing it, suggest some measures of repairing it (a) while in operation. (b) When not in operation. Repair procedures must be effective. practicable and innovative.

Q4. With reference to Auxiliary boiler safety valves;

A. Describe with the aid of Sketch the safety valve for an auxiliary boiler;

B. Identify with reasons. The parts that require particularly close attention during overhaul;

C. Describe how the safety valves are reset after an overhaul.

Q8. If soon after joining a motor ship, you found a number of holding down bolts slack and fretting to have occurred in the area of slack bolts describe how you would handle the situation?

Q1. With reference to fire pumps.

A. Explain how and when fire pumps should be tested, what are the requirements as per SOLAS74, as amended

B. Describe the routine maintenance to be carried out on the various fittings on a fire line, giving testing pressure where appropriate.

C. Describe briefly how will you dismantle a fire pump for survey. Give details of factors which will decide replacing the parts.