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

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.

Q3. The LT cooler of the centralized cooling water system on your ship is showing poor performance. What measures you would initiate to rectify the problem and improve the performance.

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?

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.

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.

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?

Q8. With reference to the exhaust gas boiler of your ship explain the following:

A. Composition and reasons of soot deposits.

B. Various stages of soot fire leading to high temperature fire.

C. Procedure to be followed for firefighting under different stages of soot fire.

D. Actions required prior to dry running of an exhaust gas boiler.

Q9. During the past four months since you joined the ship as Second engineer a number of main engine exhaust valve have suffered from cracking and corrosion at the seating faces; Write a report to the Superintendent Engineer covering the following points:

A. An explanation detailing how the problem becomes evident;

B. Your action upon recognizing the extent and seriousness of the problem;

C. Your reasoned view regarding the possible causes of the problem;

D. Your recommendations to avoid future incidents.