Q2. (a) Describe, with the aid of a sketch, an open loop system for reducing SOx emissions from engine exhaust gas, explaining how the system operates whilst the vessel is in open waters. (6)
(b) Describe, with the aid of a sketch, a closed loop scrubber system for removing SOx from engine exhaust gas, explaining the operation of this unit and stating when it would be used. (10)
Q9. (a) Define the term Torsional Vibration with respect to an engine crankshaft, stating the effect that high levels can have on an engine crankshaft. (6)
(b) Explain how engine deterioration influences the risk of Torsional Vibration, stating what can be done to minimize that risk. (4)
(c) Explain TWO possible reasons for the activation of a Torsional Vibration alarm after an engine has been started if there had been no previous history of such an alarm and if no maintenance had been undertaken on the engine whilst it was stopped. (6)
Q6. As Chief Engineer Officer, write instructions for the actions to be taken in the event of a high temperature scavenge alarm being activated, due to a rapid rise in temperature, during a period of UMS operation, stating the reasons for EACH action. (16)
Q7. (a) Explain why charge air coolers are fitted to turbocharged diesel engines, stating the possible effects on engine operation and performance if they are not maintained in good condition. (6)
(b) As Chief Engineer Officer, write instructions for the routine in-service checking of charge air cooler performance and cleanliness together with the checking of condensate draining. (6)
(c) State, with reasons, the possible consequences if condensate is not drained from the charge air cooler. (4)
Q3. As Chief Engineer Officer write a report to the engineering superintendent regarding the failure of a high-pressure fuel pump unit on an electronically controlled engine. The report must explain the nature of the failure, how the failure was detected, and the immediate action taken.
The report must also explain the actions taken to replace the pump and the steps taken to minimise the risk of future similar fuel pump failures. (16)
Q6. With reference to two stroke, slow speed engines:
Explain what is meant by the term thermal stress and how this can cause cracking of the crown surfaces; (4)
Sketch a cross section of a piston, labelling the MAIN components and indicating coolant flow; (8)
State a cause of EACH of the following defects:
(i) Burning of the crown upper surfaces; (2) (ii) Carbon deposits in the cooling spaces. (2)
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