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Q2. (a) With reference to combustion within a two-stroke diesel engine, state the effect of EACH of the following:

(i) Early injection. (6)

(ii) Late injection. (6)

(b) Sketch an Out of Phase diagram (draw card) for a two stroke diesel engine. (4)

Q2. Describe, with the aid of a sketch, the operational principles of a main engine exhaust gas turbo-charger. (16)

Q4. With reference to marine diesel engines:

(a) State the purpose of a camshaft. (2)

(b) State TWO methods of driving a camshaft on a large marine diesel engine. (4)

(c) State the speed of the camshaft relative to the crankshaft on:

(i) A four-stroke engine: (2)

(ii) A two-stroke engine. (2)

(d) Sketch a fuel cam for a unidirectional diesel engine indicating EACH of the following:

(i) Point of injection. (2)

(ii) Peak. (2)

(iii) Slow return. (2)

Q4. With reference to the reversing of an engine:

(a) Describe THREE methods by which it may be achieved (12)

(b) Explain what is meant by lost motion (4)

Q1. With respect to Main Propulsion Engines, state the immediate action to be taken as Engineer Officer of the watch in the event of EACH of the following, stating ONE reason why EACH action is necessary:

(a) Turbocharger repeatedly surging. (4)

(b) Air start manifold/branch pipe overheating local to one unit. (4)

(c) Low scavenge air temperature alarm. (4)

(d) Engine misfires, fuel rail pressure low alarm activates, booster pump pressure high (4)

Q2. (a) Sketch a typical power indicator card for a slow speed marine diesel engine. (6)

(b) Explain how the card may be used to assess the power developed in the cylinder. (10)