Q5. Explain with the help of a neat diagram the operation of a brushless alternator. What would likely happen if one of the rotating Diode fails and becomes: (16)
a) An open circuit?
b) A short circuit?
Q1. With Respect to PLC’s used onboard ships:
a) Draw and explain the block diagram of a PLC. (8)
b) Name the onboard ship equipment where PLC’s are used. (4)
c) What are the advantages of PLC controllers over other type of controllers? (4)
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)
Q4. (a) Explain the principle of a Transformer? Discuss the various types of transformers used onboard? (8)
(b) In a container ship, a 3-ph, delta/delta connected 6600/440 V, 60 Hz transformer is feeding AMP supply from shore to 440 Volt switchboard. Transformer primary current takes a line current of 100 amp, when secondary load of 0.8 lagging p.f. is connected. Determine each coil-current and KW output of transformer. (8)
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