DieselShip's Online Content Library

Q8. With reference to slow speed diesel engine turbocharging:

(a) explain why electrically driven scavenge air blowers are sometimes fitted; (4)

(b) describe how a turbocharger may be disabled to allow for operation of the main engine in the event of failure of the turbocharger rotor; (8)

(c) describe the procedure for running an engine in the event of a turbocharger not being operational. (4)

Q4. With reference to medium speed diesel engine cylinder liners:

a. Explain the cause and effects of polishing and glazing; (6)

b. Explain the action of an anti-polishing ring during the operation of the engine; (5)

c. Describe how effective cylinder lubrication is achieved. (5)

Q7. State, with reasons, THREE properties required for a cylinder lubricant for a main engine operating on HFO. (6)

(b) Describe, with the aid of a sketches, an electronically controlled cylinder lubrication system, stating how the timing and quantity of cylinder lubricant is regulated and set. (10)

Q6. With reference to engine fuel injector nozzle cooling;

(a) Explain why fuel injector nozzle cooling is necessary(4)

(b) Describe, with the aid of a sketch, the operation of a nozzle cooling system for a generator engine; (8)

(c) Explain how fuel injector nozzles are cooled on engines which are not fitted with a separate nozzle cooling system (4)

Q8. While operating in heavy weather the main engine loses power and misfires. Investigation shows considerable quantities of water in the fuel.

A. As Chief Engineer Officer explain the immediate action which should be taken to ensure safe operation of the ship.?? (6)

b. State, with reasons, the possible sources of water entering the fuel storage, handling and supply system.  (5)

c. As Chief Engineer Officer write the standing orders that would be issued with respect to operation of the fuel storage, handling and supply system. (5)

Q8. Write a report to the engineering superintendent regarding the failure at sea of a crosshead main engine bottom end bearing. The report must explain how the defect was detected, the immediate action taken to prevent further engine damage, the subsequent action taken to ensure that the vessel was able to continue on passage to the next port, probable cause of the bearing failure and other checks made on the engine. (16)

Q4. (a) State, with reasons, SIX points which should be covered in a risk assessment for the replacement of a crosshead main engine fuel injection pump in port. (6)

(b) Write instructions for the replacement of a crosshead main engine fuel injection pump. (10)