Q6. (a) Explain why variable exhaust valve closing can be advantageous in the operation of large slow speed main engines.
(b) Explain, with the aid of a sketch, how variable exhaust valve closing is achieved.
(c) Explain how high impact is avoided as the valve closes. (2)
Q2. With reference to failure of fuel injector nozzles due to burning:
(a) state, with reasons, THREE possible causes; (6)
(b) write a procedure to be used when investigating the cause of fuel injector nozzle burning; (6)
(c) describe a system which should be operated in order to minimise the risk of future fuel injector nozzle burning. (4)
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