Q1. With reference to the operation of main propulsion engines, outline the importance of EACH of the following:
(a) Maintaining the temperature of the scavenge air above the dewpoint (4)
(b) Maintaining the fuel at the correct viscosity for injection (4)
(c) Regular on board testing of the lubricating oil (4)
(d) Ensuring rotation of exhaust valves (4)
Q3. (a) Draw a line diagram of a main lubricating oil system for a large two-stroke cross-head type diesel engine. Label all the principle components of the system. (16)
Q5. With reference to auxiliary boilers:
(a) Explain how scale forms on the heating surfaces (8)
(b) State TWO reasons why scale is undesirable (4)
(c) State how scale build up is prevented from forming in steam boilers (4)
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