Q4. as chief engineer officer write a report to the company superintendent engineer concerning bacterial attack of lubricating oil in the sumps of the main engine and one of the generator engines. The report should explain how the attack was detected, damage found in the engines, investigations in the possible cause of the attack, how the immediate problem was resolved and how future incidents may be prevented. (16)
Q7. (a) State, with reasons, THREE engine operating parameters which should initiate an automatic slowdown if engine operation is outside of set value conditions; (6)
(b) Describe how the operation of each slowdown listed in part (a) may be tested; (6)
(c) List two engine operating parameters which should initiate an automatic engine shutdown, in EACH case explaining why this parameter MUST shut down the engine (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)
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)
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