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)
Q4. With respect to circuit breakers:
a) Compare the effectiveness of a current limiting circuit breaker with that of a HRC fuse. (6)
b) A coil having a resistance of 10 ohm and an inductance of 0.15 H is connected in series with a capacitor across a 100 V, 50 Hz supply. If the current and the voltage are in phase what will be the value of the current in the circuit and the voltage drop across the coil? (10)
Q5. With reference to adjoining circuit calculate following
a) Current in each branch of circuit (8)
b) Total current (8)
Q6. A 100 KVA, 2400/240 V, 50 Hz, 1-phase transformer has no- load current of 0.64 A and a core loss of 700 W, when its high voltage side is energized at rated voltage and frequency . calculate the two components of no-load current. If this transformer supplies a load current of 40 amp at 0.8 lagging power factor at its low voltage side, determine the primary current and its power factor. Ignore leakage impedance drop. (16)
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