DieselShip's Online Content Library

Q1. Explain how the following conditions affect the power developed by a diesel engine:

(a) Broken piston rings. (4)

(b) Worn fuel pump plungers. (4)

(c) Fouled turbochargers (4)

(d) Worn out liner (4)

Q2. (a) Write a letter to the company Technical Manager stating with reasons, why the fuel bunkered in the last port is of very poor quality (10)

(b) Briefly describe the mitigatory measures that can be taken to reduce the impact of poor bunker quality (6)

Q3. (a) What are the different types of crankshaft used in marine diesel engines? (10)

(b) Discuss the various factors affecting the failure of crankshafts in marine diesel engine (6)

Q4. With reference to a 2- stroke slow speed main propulsion engine 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)

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Q4. 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)

Q5. Sketch and describe an independent two-stage air compressor. Draw a set of typical indicator diagrams and insert the various pressures and temperatures. Indicate the effect of a leaking H.P. suction valve and excessive H.P. clearance volume. (16)

Q6.a) How does a modern 4-stroke medium speed marine diesel engine exhaust valve spindle rotate. (8)

b) What happens if the tappet clearance between the rocker arm tappet and the exhaust valve stem is too large? (8)

Q7. (a) Explain the types of turbocharging in a marine diesel engine. (8)

(b) What are the reasons that may induce vibration on a main engine turbocharger? (8)

Q8. (a) With the aid of a block diagram describe the operation of an electronic governor fitted to an auxiliary diesel engine. (10)

(b) State the reasons for fitting a droop governor to a diesel generator (6)

Q9. Make a diagrammatic sketch of a jacket cooling water system as applied to a group of medium speed auxiliary diesel engines. Indicate the temperatures and pressures in the system. Describe in particular, the flow of water from entry to the engine, to the outlet from the engine and sketch the more important joints in the system (16)