Q8. A. Describe the precaution necessary during the initial running-in of an Auxiliary Engine run on which is newly installed or has a major overhaul; B. Explain the possible causes of oxidation of lubricating oil. C. State the frequency with which oil samples should be taken for analysis.
Q1: During a river passage the propeller of a light ship is rotating at dead show revolutions ahead when it strikes a large floating object causing a momentary drop in engine revolutions. As the Second Engineer of the vessel describe in report format, the inspection of the vessel’s propulsion and transmission system that you would supervise to ensure that is safe for the vessel to continue in voyage. Assume that the vessel is anchored and that no outside assistance is available.
Q5. Give a list of the properties or tests by which distillate and blended fuels may be specified or decisions be made on their fitness for use. Name the properties or constituents that may be found in a blended fuel having a high viscosity and high carbon content. Explain how they may cause problems in engine operation
Q4. a) Explain the construction, working and adjustment procedure of a high-lift safety valve used on marine boilers. (8)
b) Describe the procedure, purpose and safety precautions involved in conducting an accumulation of pressure test on a marine boiler. (8)
Q2. Sketch and describe the means used for operation of air starting valves of a large engine. Explain how engine reversal is affected.
Q6: An Auxiliary engine exhibits a tendency to hunt to such an extent that the engine speed variation prohibits the connection of the machine to the switchboard.
A. Discuss the possible causes of hunting.
B. Explain how the problem of hunting can be rectified.
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.
Q3. With reference to a main engine fuel system of the high-pressure common rail type:
(a) Sketch a common rail fuel injection system from booster pump inlet to cylinder head fuel valves, labelling the MAIN components.
(b) Explain how the fuel pumps are operated and the common rail pressure is maintained;
(c) Explain how fuel injection timing and quantity is regulated for the common rail fuel system sketched in part (a).
Q9. a) For a large slow speed direct reversing engine, describe in detail the profile of a cam suitable for fuel pump operation in either the ahead or astern mode. (6)
b) With respect to cam material, describe the heat treatment employed during manufacture. (5)
c) Explain how the position of the cam relative to the crankshaft is altered when changing from Ahead to Astern running. (5)
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