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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

2
6
8
4

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A.C. network analyzer is used to solve problems of

Load flow and short-circuit
Load flow, short-circuit and stability
Load flow and stability
Load flow

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A circuit breaker must perform the duty of

opening the faulty circuit and breaking the fault current
being closed on to a fault
carrying fault current for a short time
All of these

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

vaccum circuit breaker
oil circuit breaker
sf6 circuit breaker
air-blast circuit breaker

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Admittance relay is

impedance relay
directional relay
None of these
non-directional relay

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Wave trap is used to trap waves of

power frequencies
higher frequencies entering generator or transformer units
None of these
either of the above

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