Discussion

Match List I with List II.

Choose the most appropriate answer from the options given below :

Answer: A

The correct matching is (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii).

The exciter supplies the field current of the alternator, so it controls the terminal voltage (and reactive power): (i).
The governor controls the prime mover's input, and so the active power output and frequency: (iii).
A lightning arrester diverts surge overvoltages to earth: (iv).
A circuit breaker interrupts overcurrents and fault currents when its relay trips it: (ii).

The other options give the governor voltage control or the circuit breaker overvoltage duty, which are the jobs of the exciter and the arrester.

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