DieselShip's Online Content Library

Q1. (a) Sketch a main engine electronically controlled fuel injection system (6)

(b) Explain how fuel injector quantity and timing is changed in the fuel injection system sketched in part (a) (6)

(c) State why it may be necessary to change engine fuel timing (4)

Q4. Explain with aid of sketches, the gas combustion process in a dual fuel medium speed main engine, operating with pilot injection. (10)

Explain exhaust is meant by exhaust gas recirculation and how this may be effective in reducing air pollution. (6)

Q5. (a) draw a labelled sketch through a section of a crosshead tyope engine, showing the location and fitting of tie rods. (4)

(b) Explain why tie rods are fitted in crosshead engines and are not required for trunk piston engines. (6)

(c) As chief engineer officer, write instructions for the checking of tie rods fitted in an engine, stating the equipment to be used. (6)

Q6. (a) Describe a procedure for cylinder liner calibration, indicating how the readings are recorded to allow for easy recognition of liner wear. (6)

(b) Describe TWO forms of abnormal cylinder liner wear, explaining how each is recognised. (6)

(c)Explain how abnormal cylinder liner wear may be prevented. (4)

Q3. (a) Explain why a diesel engine cylinder is supplied with excess air. (4)

(b) Explain why fuel droplet size produced during injection has to be within narrow limits in order to enable good cylinder combustion to be achieved. (4)

(c) Explain how the desired fuel droplet size is produced by fuel injectors. (4)

(d) State why fuel injection timing has to be within narrow limits to enable economic engine operation without bearing overload. (4)

Q4. With reference to diesel engine SOx exhaust gas cleaning and pollution control:

(a) state, with reasons, which system parameters are monitored, explaining where the monitoring devices are located, how the data is stored and how data is made available. to regulatory authorities. (10)

(b) state how pollution of sea water can be caused by the use of SOx exhaust gas cleaning systems, explaining how such pollution is prevented. (6)

Q7. (a)  Describe, with the aid of a sketch, a main engine fresh water cooling water system, incorporating HT and LT systems.

(b). Describe the charge air supply system for a turbocharged engine, explaining the purpose of each main part. (6)