Q1. Discuss the criteria of the classification of marine high voltage for A.C. and D.C. Systems. Sketch a Ships high voltage distribution system and explain its features. Discuss the various methods of testing the insulation of HV system, Mention the significance of PI test, why 3 terminals insulation testers are used in HV insulation measurements. (16)
Q2. a) Explain briefly about checks and calibration of a thermostat which is used to step an air compressor, when cooling water temperature goes too high? (8)
b) what is the significance of earth faults in an isolated neutral system? Explain with a suitable diagram. (8)
Q2. a) Explain with the aid of a diagram, a controller utilizing proportional plus integral action. (6)
b) List out the Advantages and Disadvantages of electric propulsion system. (5)
c) Explain briefly what you know about “Pulse Width Modulation” and how it can be applied for propulsion control. (5)
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