Electrical Engineering MCQs

Page No. 157

Short-circuit currents are due to_______________?


a single phase to ground faults

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b phase to phase faults

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ctwo phase to ground faults

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dany of these

✓


View Answer any of these

A.C. network analyser is used to solve problems of_______________?


a load flow

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bload flow and short-circuit

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cload flow and stability

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d load flow, short-circuit and stability

✓



To reduce short circuit fault currents are used_____________?


areactors

✓


b resistors

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ccapacitors

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dnone of the above

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View Answer reactors

Induction cup relay is operated due to changes in________________?


acurrent

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bvoltage

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cimpedance

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dall of the above

✓


View Answer all of the above

When a wave propagates on a transmission line, it suffers reflection several times at_____________?


atapping

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bload end

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c sending end

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dsending and other end

✓


View Answer sending and other end

The reflection co-efficient at the open circuited end of a transmission line___________?


a zero

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b infinity

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cunity

✓


d none of the above

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View Answer unity

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?


alubricate the contacts

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binsulate the contacts from switch body

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cextinguish the arc

✓


dall of the above

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View Answer extinguish the arc

H.R.C. fuses provide best protection against________________?


a overload

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b reverse current

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copen-circuits

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dshort-circuits

✓


View Answer short-circuits

To protect most of the electrical equipment handling low power, the types of relays used are______________?


athermocouple

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belectronic and bimetallic

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cboth (A) and (B)

✓


dnone of the above

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View Answer both (A) and (B)

Which of the following is the least expensive protection for overcurrent is low voltage system ?


aRewireable fuse

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bIsolator

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cOil circuit breaker

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d Air break circuit breaker

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View Answer Rewireable fuse

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