Q3. With Respect to Insulated and Earthed Neutral Systems used on board:
a) Discuss the Advantages and Disadvantages of both Insulated and Earthed Systems used on board. (8)
b) What is earth fault and how do you identify Earth fault in the 440 V system onboard. (4)
c) Discuss the consequences of earth fault in an earthed distribution system. (4)
Q1.a) Explain three methods of overcurrent protection for electrical circuit. (8)
b) Explain with aid of diagram, the meaning of the term inverse current time characteristic (8)
Q3. a) What are safeties incorporated in ACB of ship’s generator and prime mover? (10)
b) Explain the procedure to test reverse power relay (6)
Q5. With Reference to different types of transformers used onboard.
a) Discuss the basic principle of operation of a transformer (5)
b) Enumerate the different types of transformers used onboard also state their functions for which they are used. (5)
c) A 440/110 V single phase transformer supplies a load of 5kW at 0.8 power factor load. Calculate the primary and secondary currents. (Ignoring transformer power losses)? (6)
Q1. Explain the principle of operation of synchronous Motors with a simple sketch. Where are synchronous motor used onboard? (16)
Q2.a) Explain three methods of overcurrent protection for electrical circuit. (8)
Q1. What is Zener diode and how does it regulate the voltage? What happens to the series current, load current and Zener current when the d.c input voltage of a Zener regulator increases? Draw a neat diagram of Zener regulator and explain. (16)
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