Q3. (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 minimise that risk. (5)
(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. (5)
Q7. What is meant by ‘Power balancing’ with respect to reciprocating engines? Why is balance desirable and how is it obtained in the case of a large marine engine? What difficulties may be experienced in balancing an engine running at about 500 R.P.M. and how can these difficulties be overcome?
Q3. What are the key parameters used to assess marine fuel quality, and how do these parameters impact engine performance, fuel efficiency, and emissions control on a ship? (16)
Q4. a) What is the purpose and key procedures involved in the running-in process of a engine, and how does this process contribute to the long-term reliability and performance of the engine? (8)
b) What are the common issues that can arise during the running-in period of a engine, and what measures should be taken to monitor and address these issues to prevent potential damage or inefficiencies? (8)
Q5. Why should the exclusion of oxygen from the boiler water of a water-tube boiler be regarded as important? Describe measures, both mechanical and chemical, that are intended to achieve oxygen free boiler water under working conditions. What precautions would you take when laying up a water-tube boiler for (a) a considerable period, (b) a few days? (16)
Q2. Describe methods of static and dynamic balancing of an engine and describe what are first order, second order and higher order moments in engine.
Q7. A. Difficulty has been experienced in maintaining engine speed at the set value. State the possible causes and how each of these causes may be detected. (8)
B. Describe the action to be taken in order to ensure safe operation of the main engine plant in the event of complete failure of the remote control and sensing equipment. (8)
Q2. With reference to diesel engine SOX exhaust gas cleaning and pollution control:
(a) State, with reasons, which system parameters are monitored, explaining where the monitoring devices are located, how the data is stored and how data is made available to regulatory authorities
(b) State how pollution of sea water can be caused by the use of SOX exhaust gas cleaning systems, explaining how such pollution is prevented.
Q3. What is slow steaming & how it’s achieved without engine modification? Enumerate various operational issues with slow steaming. How such operational issues can be dealt with?
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