Electrical Engineering MCQs

Page No. 160

A differential relay measures the vector difference between_________________?


atwo currents


btwo voltages


c two or more similar electrical quantities


dnone of the above



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


acurrent during abnormal condition


b voltage during abnormal condition


cconstantly the electrical quantities which differ during normal and abnormal conditions


dnone of the above



In a circuit breaker the basic problem is to________________?


amaintain the arc


b extinguish the arc


ctransmit large power


demit the ionizing electrons


View Answer transmit large power

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


arecovery


bsurge


coperating


darc


View Answer recovery

Large internal faults are protected by_______________?


a merz price percentage differential protection


bmho and ohm relays


chorn gaps and temperature relays


dearth fault and positive sequence relays



Directional relays are based on flow of____________?


apower


b current


cvoltage wave


d all of the above


View Answer power

Air blast circuit breaker is used for_____________?


aover currents


bshort duty


cintermittant duty


drepeated duty


View Answer repeated duty

Circuit breakers usually operate under______________?


atransient state of short-circuit current


bsub-transient state of short-circuit current


csteady state of short-circuit current


dafter D.C. component has ceased



D.C. shunt relays are made of_____________?


afew turns of thin wire


bfew turns of thick wire


cmany turns of thin wire


dmany turns of thick wire



Circuit breakers are essentially____________?


acurrent carrying contacts called electrodes


barc extinguishers


ccircuits to break the system


d transformers to isolate the two systems



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