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Q1. Explain the difficulty faced in lubrication of crosshead bearings and how this is overcome by the engine makers of two stroke low speed main propulsion engines type with suitable sketches. (16)

Q4. With reference to auxiliary engine fuel pumps

a) Explain how a fuel pump may be checked for accuracy of injection timing. (6)

b) Describe how fuel pump may be adjusted after overhaul. (5)

c) Explain the circumstances in which it is considered necessary to replace a fuel pump. (5)

Q2. a) With reference to crankshafts and piston crowns outline the main stresses to which these parts are subjected. (4)

b) In each case explain how the stresses are generated and how they very in magnitude and direction during one cycle. (6)

c) With respect to the whole engine, describe how stresses may be accommodated by good design and influenced by poor maintenance. (6)

Q4. Sketch and describe the operation of a governor suitable for a diesel generator.

Q5. (a) Sketch and describe a device employed for continuous monitoring of the viscosity of heavy fuel oil being supplied to a main engine (8)

(b) Explain how the system employing the device described in (a) operates to adjust the fuel viscosity. (8)

Q6. Explain how leakage of the undermentioned valves may become apparent to watchkeepers and state the effects on engine operation. Describe the immediate and subsequent action Which might be necessary in each case.
(a) Exhaust valve
(b) Fuel valve
(c) Air Starting valve

Q4. With reference to lubricating oil:

(a) Explain why oil employed in the crankcase of a trunk piston engine differs in its properties from that employed in the crankcase of a crosshead engine. (6)

(b) List FOUR effects of bacterial attack on crankcase oil.

(c) Explain the action which must be taken if bacterial attack of the crankcase oil is detected. (4)

Q1. (a) Describe the procedure for taking crankshaft deflection of Auxiliary Engine, explaining all precautions that must be observed (8)

(b) Explain what deflection readings actually mean and suggest the action which must be taken should readings be outside values recommended by the engine manufacturer. (8)

Q5.a) State why double walled fuel pipes are employed for high pressure fuel lines. (6)

b) Sketch and describe such a double walled pipe arrangement and show how high-pressure pipe failure is indicated. (10)