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. With reference to main engine turbochargers:
(a) Explain their function (4)
(b) Stating TWO advantages of fitting them (4)
(c) Explain how they are cooled and lubricated. (8)
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)
Q4. With reference to a small diesel engine that requires the use of a starting handle:
(a) State the procedure for starting (8)
(b) State EIGHT reasons that would cause difficulty in starting (8)
Q5. With reference to auxiliary boilers:
(a) State the effect on operation in the event of EACH of the following conditions:
(i) High water level; (2)
(ii) Low water level; (2)
(iii) Extra-low or low-low water level. (2)
(b) Describe the procedure for verifying the water level in a low-pressure boiler gauge glass. (10)
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