DieselShip's Online Content Library

Q1. With reference to poor ignition quality fuel:

(a) Explain how it can affect combustion in BOTH slow speed and medium speed diesel engines; (8) (b) Explain how the effects on BOTH diesel engine types in part (a) can be reduced. (8)

Q2. With reference to main engine crankcase explosions:

a. Explain the cycle of events leading to a secondary crankcase explosion; (6)

b. As Chief Engineer, explain how an engine system should be managed in order to minimise the risk of a crankcase explosion and the effects of a crankcase explosion should one occur. (10)

Q4. (a) Explain why crankshaft deflections are taken. (4)

(b) Write a procedure for the taking of main engine crankshaft deflections. (8)

(c) Explain the action to be taken if some crankshaft deflection readings are outside

acceptable limits. (4)

Q3. With reference to diesel engine hybrid Sox scrubber systems:

(a) State the fluids used in the open and closed loops of the scrubber, explaining how these fluids are controlled to meet the scrubbing demand at different engine loads;(6)

(b) State the circumstances under which Open Loop scrubbing would be used and Closed Loop scrubbing would be used; (2)

(c) Describe how the effective Sox neutralizing effect of the fluid used in the closed loop system is maintained during long operating periods and how pollution of the sea is avoided.(8)

Q5. With reference to electronically controlled engines:

A. Describe how fuel injection quantity and timing is adjusted. (6)

B. Describe how the exhaust valve timing may be varied. (5)

C. Describe how starting air valves are regulated. (5)

Q6. Write a report to the superintendent engineer concerning an incident of cracking which was discovered in one piston of a main diesel engine and the subsequent discovery of cracking in another piston of the same engine. The report must include information about the immediate action taken to prevent further damage to the engine, the subsequent action to remedy the fault and recommendations to prevent subsequent future incidents. (16)

Q7.A. Explain why premixing of gas and air before supply to the engine cannot be undertaken with 2-stroke cycle engines but can be applied to 4-stroke engines. (4)

B. Describe, with the aid of a sketch, the fuel arrangement at the cylinder of a 2-stroke cycle dual fuel diesel engine which operates with high pressure gas injection. (12)

Q8. a. Describe, with the aid of a sketch, a main engine fuel oil circulating system incorporating the MGO and HFO service tanks, a fuel change over system, heating and viscosity control system and tank return system. (10)

b. Write instructions for changing the system described in part (a) of the question from MGO to HFO, indicating the checks to be made during the changeover. (6)

Q9. a. Describe, with the aid of a sketch, a waste heat steam generating system incorporating separate oil-fired boiler and diesel engine exhaust gas heat recovery unit (Economiser). (10)
b. Explain how the system described in part (a) operates to ensure that the correct steam pressure is maintained during variations engine load and steam consumption. (6)