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Q1. In an automatic backflushing filter (e.g. for fuel oil or lube oil), what normally initiates a cleaning cycle? (16)

(a) A high differential pressure across the filter, or a preset timer interval, whichever occurs first.
(b) Manual opening of the drain cock by the engineer on watch.

(c) A rise in oil temperature at the filter outlet.

(d) A drop in the oil level of the service tank.

Briefly discuss the operation of an automatic backflushing filter and justify the correct option you chose from the above four.

Q2. Clean and dry control air is essential for efficient trouble-free operation of a ship’s pneumatic’ control air system.

a) Sketch and describe a low-pressure control air system used on board ships showing various arrangements to deal with dust, oil and moisture as well as safety systems. (8)

b) Explain using a line diagram, arrangements provided, to reduce the air pressure to 7/8 bars. Required for control air system. (8)

Q3. Describe with the aid of suitable graph, the discharge characteristics of a centrifugal pump. Explain why it does not require a relief valve. (16)

Q4. Give an outline sketch of Heavy F.O. settling tank heating system and briefly explain the system. Sketch only the low-pressure steam inlet up to condensate collection tank. (16)

Q5) The auxiliary boiler of a ship periodically needs feed water, and the rate of feed is gradually increasing every day, without an increase in demand. Suggest some causes for such a happening. (16)

Q6) Write short notes on the following:

(a) Need to ensure that D.O. service tanks are not heated beyond a certain temperature. (4)

(b) Importance of the level of the F.W. compensating tank for jacket cooling of main engines as an indicator of impending trouble. (4)

(c) Need to check remote stop of all F.O. installations regularly. (4)

(d) Necessity for a proper check of all engine room parameters before taking over of watch. (4)

Q7. a) What are the safety devices fitted to an Air Compressor? (4)

b) What is the purpose of the Scum Valve on a Boiler? (4)

c) What is the function of an Evaporator in a Refrigeration System? (4)

d) Regarding the Emergency Bilge Injection Valve, what is its relevant size compared to the Main Sea Water Injection Valve? (4)

Q8) (a) Describe the constructional features of plate type freshwater generator and its operational procedures for freshwater generation. (6)

(b) State the temperatures and pressures at salient points. (4)

(c) State some of the advantages and limitations that exist in using a plate type heat exchanger. (6)

Q9. a) Whils't on ‘seawatch’ you observe that the Oil Mist detector (OMD) in the engine room has triggered an alarm, and in feeling the crankcase doors on the bottom platform, you find that the unit in question feels warmer than the rest. What pre-emptive action will you take as Watch-keeper to bring the situation under control. (10)

b) Draw a simple line diagram of an ‘OMD’ and explain it’s working. (6)