Q1. Describe the main engine shaft engine generator arrangement with an electronic system for frequency correction. Describe he operation of the generator arrangement so sketched.
Q9. a). If an auxiliary diesel generator over-speeds and runs away while off the load, explain: - i. How it can be stopped,
ii. What is likely to be the reasons for the failure.
b). Give-details of what cheeks are made after the machine has been stopped:
(i) Mechanically, (ii) Electrically.
Q3. The analysis of oil may be used as a method of monitoring the condition of the equipment that it lubricates A. Explain briefly how shore analysts might test the oil; B. State the type of information that would be expected; C. Give possible reasons for an excess of: - i. Iron, ii. Copper, iii. Antimony Iv. Tin, v. Silica
Q2. During a routine crankcase inspection a main engine top end bearing is found to be wiped and subsequent inspection shows that the pin is badly scored.
A. Explain in detail the action which should be taken to enable the engine to be safety operated so that the vessel may reach a port where effective repair facilities are available.
B. State with reasons the factors which influence the speed at which the engine may be safely operated.
Q9. A diesel generator when fitted in a machinery space which is periodically unmanned may be equipped with monitoring alarms of the exhaust temperatures. Discuss the relative merits of
A. Individual cylinder maximum temperature alarms;
B. Individual cylinder maximum and minimum temperature alarms;
C. Individual cylinder maximum temperature alarm and an alarm for any two cylinders exhaust temperatures deviating more than 35°C. Explain how arrangement can be provided for.
Q2. With reference to behaviour of fabricated bed plates and frames in services:
A. Identify various forces imposed simultaneously upon them;
B. Explain how engine structure withstands these forces;
C. State how these forces are transferred to ship’s structure
Q7. Describe the process of inspecting the running gear of a main diesel engine. What is the purpose of such an inspection and what defects may be found?
Q5. Explain the term “cascade control’ and sketch such a system suitable for use with a main engine jacket cooling water system. Show the variation of pressure and temperature at major points of the system.
Q9. Draw a line diagram of a complete feed water system for an auxiliary boiler labelling all the principal items and showing the direction of flow in all lines. B. Explain how the feed supply to the boiler is regulated; C. State what means are provided to prevent oil contamination of the feed water.
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