Q5. Discuss the dangers associated with a main engine starting air system, explaining how Discuss these dangers are mitigated. (9)
(b) State, with reasons, THREE causes of an engine failing to fire on fuel after successfully turning over on starting air. (3)
(c) Explain how the engine is transferred to local (engine side) control in the event of failure of the main engine remote control system. (4)
Q5. (a) Describe, with the aid of a sketch, a waste heat recovery system for electrical generation using main engine exhaust gas in combined gas/steam turbine systems. (8)
(b) Describe the operation of the waste heat recovery system described in part (a) whilst the associated main engine is running. (8)
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)
Q7. With reference to diesel engine lubricating oil and distillate fuel oil:
(a) describe the causes and effects of microbial attack; (6)
(b) explain how microbial attack may be detected; (4)
(c) describe how an oil system may be returned to service following microbial attack. (6)
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