Q1. State the immediate action to be taken in the event of EACH of the following circumstances occurring with a large main propulsion diesel engine, giving the possible consequences of not taking any action for EACH:
(a) Turbocharger surging during heavy weather (4)
(b) Excessive vibration from turbocharger at full sea speed (4)
(c) Overheating of air start branch pipe to one cylinder during manoeuvring (4)
(d) High main bearing temperature (4)
Q2. Describe, with the aid of sketches, the operation of a 4 -stroke cycle diesel engine. (16)
Q3. With reference to a main engine air starting system:
(a) State FIVE important safety features fitted to the system (10)
(b) State how a leaking air start valve may be detected when the engine is running (2)
(c) Explain the dangers of allowing a leaking air start valve to persist (4)
Q4. a. State the name of the equipment used to give a warning of the presence of conditions that could lead to an explosion in the crankcase of a diesel engine. (2)
b. Sketch and describe the device used to relieve any excess pressure that might develop as a result of a crankcase explosion in a diesel engine. (14)
Q5. (a) State the consequences of not testing or treating the water in a boiler. (4)
(b) For a fire tube auxiliary boiler
(i) Explain how scale may form on the heating surfaces. (4)
(ii) State FOUR tests which are usually carried out on the boiler water (8)
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