Q1. With reference to scavenge fires:
(a) State FOUR possible contributing factors. (4)
(b) Explain how EACH factor mentioned in (a) contributes. (8)
(c) State FOUR indications. (4)
Q2. Describe, with the aid of sketches, the operation of a 4 -stroke cycle diesel engine. (16)
Q3. (a) Answer the following:
(i) State why the simultaneous injection of fuel oil and starting air into a main engine cylinder is undesirable. (2)
(ii) Explain how simultaneous injection of fuel oil and starting air is prevented. (4)
(b) Answer the following:
(i) Explain how a leaking air start valve is detected while the engine is running. (4)
(ii) Describe the actions to be taken upon discovery of a leaking air start valve. (6)
Q4. With reference to main starting air compressors:
(a) State THREE maintenance procedures that maintain their efficiency: (6)
(b) Describe the procedure for the manual starting of a compressor. (10)
Q5. List FOUR safety or alarm devices fitted to an automatically controlled auxiliary boiler indicating how EACH of these devices may be tested. (16)
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