Q1. Describe the procedure for preparing a main engine, from cold, for sea service (16)
Q2. (a) Describe how modern diesel engines are pressure charged. (8)
(b) State TWO reasons for cooling the charge air before it enters the engine. (8)
Q1. (a) Explain why an engine may fail to start on air when the start air receiver is fully charged and the air receiver outlet to the engine is open.(10)
b) Describe how problems with air start systems may be avoided. (6)
Q3. With reference to Jacket Cooling Water treatment of a diesel engine:
(a) State the chemical tests caried out (6)
(b) State the frequency of testing (2)
(c) Explain why it is necessary to keep the test results within certain limits (4)
(d) State the action to be taken to rectify an abnormal test result (4)
Q2. (a) Describe the sequence of events that may lead to a crankcase explosion. (6)
(b) Describe an oil mist detector, explaining how it operates. (8)
(c) Describe how an oil mist detector operation is checked for accuracy. (2)
Q4. (a) Sketch a camshaft timing chain arrangement indicating how the chain tension is adjusted. (12)
(b) State TWO items of ancillary equipment which can be driven via the timing chain. (4)
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