Q1. a) What precautions must be taken when testing the insulation of generator cables and wiring connected to an AVR unit? (6)
b) How could you monitor the correct instant for synchronising, if synchroscope and synchronising lamps are not working? (6)
c) How is the air gap of an alternator is measured and why the air gap of an alternator to be checked periodically? (4)
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)
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)
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