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Q9. With respect to the operation of two stage reciprocating air compressor. Explain:

A. The causes of occasional lifting of 2nd stage relief valve.

B. Breakage of valve plates.

C. Puncture of bursting disc of 1st stage intercooler.

D. Noticeable reduction in capacity of the compressors over a period of time.

Q1. Describe TWO methods of tracing a subsurface crack in a machinery component. Explain with reasons which one of the two methods mentioned above is the most appropriate for detecting cracks in engine crankshafts.

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?

Q9. Abnormal vibration has been observed in an HFO purifier while in operation. Explain the areas you plan to investigate for rectifying the faults and put back the purifier back to normal operations keeping in view that no reduction in vibration has been noticed even after desludging the purifier couple of times.

Q5. A. State the circumstances owing to which it may be necessary to renew an exhaust valve;

B. Explain how the exhaust valve is removed and fitted back;

C. State the important checks to be made on the engine before after fitting the exhaust valve.

Q5. A). Describe the procedure for overhauling a boiler safety valve and explain using sketches where necessary, those parts, which require close attention.

B). Describe the procedure for setting of boiler safety valves.

Q7. Describe with a neat sketch the principle and operation of Biological & Chemical Sewage treatment plant.

(a) What do you meant by B.O.D. What is the significance of B.O.D.

(b) What are the discharge criteria according to MARPOL Regulations?

(c) What routine maintenance is carried out on such Sewage treatment plant?

Q8. Explain in detail how you would isolate one of sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service.

Q9. List the maintenance routines you plan to carry out on the deck hydraulic cranes, winches and mooring machineries before arrival port after a long voyage, considering the fact that cargo operation is solely dependent on the proper Functioning of the crane and winches.