Q3. 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)
Q2. a) Briefly Explain Intrinsically safe circuit and Explosion proof circuit. (6)
b) What is EXD and EXI? Where they are used onboard ship. (3)
c) What all Intrinsically safe equipment used on Deck, explain how they are Intrinsically safe. (3)
d) What is Zener Barrier? How flame and explosion contained inside the enclosure. (4)
Q2. a) Explain why it is necessary to have reverse power protection for alternators intended for operation. (6)
b) (i) Sketch a reverse power trip. (5)
(ii) Briefly explain the principle on which the operation of this power trip is based and how tripping is activated. (5)
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