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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.

Q1. (a) Explain in detail how the engine room’s hyper mist or high-pressure fog firefighting system works in auto mode and manual mode.

(b) How you would isolate hyper mist or high-pressure fog firefighting system for routine maintenance.  Describe all tests and inspections you would make and how you would return the system to service.

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. Using sketches explain the difference between Pulse and Constant pressure turbocharger systems.

A. In the event of a Pulse turbocharger becoming inoperative due to mechanical breakdown explain the modifications required to allow the engine to operate safely.

B. State the instruction you as second engineer would issue regarding the additional engine monitoring requirements following the steps taken in (a).

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.

Q6. Describe the procedure to remove a seized Main Engine Exhaust Valve from the cylinder head when it could not be removed by conventional means, Also list out preventive measures which could be implemented in the vessel so that such a seizure can be prevented in the future.

Q8. With respect to hydraulic Ram steering gears;

A. What emergency locking device can be used in order to speedily bring the steering gear to rest? State one reason the best angular position to lock the steering gear.

B. Use a simple sketch to show where the “Jumping” (top) and wear down (bottom) rudder carrier ring clearances can be measured. Indicate what clearances you would expect with a new steering gear;

C. State the consequences of the wear down clearances being reduced to less than Zero.

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.

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.