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Q8. (a) (i) Describe with the aid of a sketch, a main engine exhaust valve which is hydraulically operated (8)

(ii) Explain the operation of this valve (4)

(b) State the materials used for the seat and valve described in (a) (4)

Q4. In a situation where the main engine control system suddenly fails, and it is not possible to rectify this immediately

A. Explain the action that a 2nd engineer should take. (8)

B. State the instruction that the 2nd engineer should issue in order to ensure the continued safe and effective operation of the engine. (8)

Q6. Write short notes on:

(a) Main air starting valves (4)

(b) Exhaust valve rotator (4)

(c) Scavenge relief valve (4)

(d) Function of Labyrinth Seals in turbocharger (4)

Q5. A. Describe the events leading to a crankcase explosion.

B. How is overheating indicated other than by a mist detector. (6)

C. How is severity of a crankcase explosion controlled. (5)

D. Discuss the action required when overheating is indicated. (5)

Q5. A large marine diesel main propulsion engine, speed fluctuates all the time during the voyage. Make written statements to the chief engineer explaining the observation of various engine parameters, during the voyage which could be indication of some fault, causing engine speed fluctuation. (16)

Q6. A. Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil at outlet of the cooler (6)

B. Explain why air supplied to a pneumatic control system must be free from dust and water (4)

C. Describe how above impurities are removed (4)

D. State the possible consequences if the air supply is contaminated. (2)

Q8. (a) Explain briefly how the different moving parts of a main engine are subjected to various stresses. (8)

(b) Name the stresses and justify by stating how they originate. (8)