Q1. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to: (16)
(a) The quality of fuel
(b) The quality of servicing of the governor in the last port
(c) The supply of charge air
(d) The overhaul of fuel injectors done in the last decarbonisation.
Give a brief explanation as to why each of the above mentioned points either could be true or cannot at all be the reasons for such a fluctuation.
Q2. With reference to a 2- stroke slow speed main propulsion engine, sketch a line diagram showing the air starting system:
(a) State, with reasons, three safety features incorporated in an air starting system. (8)
(b) State with reason why an engine may fail to turnover on air (8)
Q3. Discuss the precautions, which can be taken to minimize the possibility of a diesel engine crank case explosion and the transmission of dangerous flame into the machinery space.
(a) By design and equipment (8)
(b) By operating personnel (8)
Q4. (a) What are the causes of Turbocharger surging? How is it indicated to the watchkeeper? (8)
(b) What are the possible remedial action? (4)
(c) What are the reasons for excessive fouling of the turbocharger? (4)
Q5. With reference to the diesel prime movers for generators in unmanned machinery spaces:
(a) Outline the monitoring and control equipment designed to protect the engine. (8)
(b) Describe the methods employed to test the monitoring and control equipment, during a routine check. (8)
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