Electrical Engineering MCQs

Page No. 160

A differential relay measures the vector difference between_________________?


atwo currents

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btwo voltages

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c two or more similar electrical quantities

✓


dnone of the above

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Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?


acurrent during abnormal condition

✖


b voltage during abnormal condition

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cconstantly the electrical quantities which differ during normal and abnormal conditions

✓


dnone of the above

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In a circuit breaker the basic problem is to________________?


amaintain the arc

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b extinguish the arc

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ctransmit large power

✓


demit the ionizing electrons

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View Answer transmit large power

The voltage appearing across the contacts after opening of the circuit breaker is called__________voltage


arecovery

✓


bsurge

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coperating

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darc

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View Answer recovery

Large internal faults are protected by_______________?


a merz price percentage differential protection

✓


bmho and ohm relays

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chorn gaps and temperature relays

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dearth fault and positive sequence relays

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Directional relays are based on flow of____________?


apower

✓


b current

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cvoltage wave

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d all of the above

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View Answer power

Air blast circuit breaker is used for_____________?


aover currents

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bshort duty

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cintermittant duty

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drepeated duty

✓


View Answer repeated duty

Circuit breakers usually operate under______________?


atransient state of short-circuit current

✓


bsub-transient state of short-circuit current

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csteady state of short-circuit current

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dafter D.C. component has ceased

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D.C. shunt relays are made of_____________?


afew turns of thin wire

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bfew turns of thick wire

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cmany turns of thin wire

✓


dmany turns of thick wire

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Circuit breakers are essentially____________?


acurrent carrying contacts called electrodes

✓


barc extinguishers

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ccircuits to break the system

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d transformers to isolate the two systems

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