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Q1. As Chief Engineer Officer, write a report to the vessel’s owner proposing the adoption of onboard HFO sample testing, explaining which properties would be tested and the operational benefits which may be achieved. (16)

Q4. With reference to medium speed diesel engine cylinder liners:

a. Explain the cause and effects of polishing and glazing; (6)

b. Explain the action of an anti-polishing ring during the operation of the engine; (5)

c. Describe how effective cylinder lubrication is achieved. (5)

Q1. (a) Sketch a main engine electronically controlled fuel injection system (6)

(b) Explain how fuel injector quantity and timing is changed in the fuel injection system sketched in part (a) (6)

(c) State why it may be necessary to change engine fuel timing (4)

Q1. With reference to diesel engine NOx emissions and control:

(a) Explain how exhaust gas recirculation and direct water injection reduce engine NOx emissions but result in increased specific CO2 emissions. (6)

(b) Describe, with the aid of a sketch, a Selective Catalytic Reduction system, stating, with reasons, the monitoring and control systems required.

Q5. (A) Describe, with the aid of a sketch, a main engine starting air system, stating the safety

devices which are incorporated.

(B) In the event of the main engine failing to turn over on air even though there was sufficient air pressure in the starting air receivers, explain the procedure for tracing the cause of the failure.

Q2. With reference to turbocharger systems;

a. Describe, with the aid of a sketch, a turbocharger jet assist system, explaining how it and why it is used. (10)

b. Describe with the aid of a sketch a waste gate and by pass system explaining why such an arrangement is fitted. (6)

Q6. (a) As Chief Engineer, explain how the performance of a main diesel engine may be determined, indicating how the information collected is analysed to assess the performance of an individual cylinder in relation to the overall engine performance. (6)

(b) Explain how defective fuel injection may be detected stating, with reasons, the causes of defective cylinder fuel injection. (6)

(c) Explain the causes of afterburning in a single cylinder of a diesel engine, stating how this may be brought to the attention of the duty engineer. (4)

Q8. (a) With the aid of sketches, explain the term "fatigue" as applicable to engineering components. State what is meant by the term "fatigue limit". (12)

(b) Explain the term "stress raiser" with respect to fatigue, giving THREE examples and stating how stress raisers reduce the fatigue life of a component. (4)

Q9. With reference to an economiser:

(a) write a procedure for the cleaning of the gas side of an economizer when the associated main engine is:

(i) Running; (5)

(ii) Stopped. (5)

(b) write a procedure for operation of the main engine when the associated economiser cannot be operated due to tube failure (6)

2022/JUL/Q9