Electrical Engineering MCQs

Page No. 157

Short-circuit currents are due to_______________?


a single phase to ground faults


b phase to phase faults


ctwo phase to ground faults


dany of these


View Answer any of these

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


a load flow


bload flow and short-circuit


cload flow and stability


d load flow, short-circuit and stability



To reduce short circuit fault currents are used_____________?


areactors


b resistors


ccapacitors


dnone of the above


View Answer reactors

Induction cup relay is operated due to changes in________________?


acurrent


bvoltage


cimpedance


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


bload end


c sending end


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


b infinity


cunity


d none of the above


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


binsulate the contacts from switch body


cextinguish the arc


dall of the above


View Answer extinguish the arc

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


a overload


b reverse current


copen-circuits


dshort-circuits


View Answer short-circuits

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


athermocouple


belectronic and bimetallic


cboth (A) and (B)


dnone of the above


View Answer both (A) and (B)

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


aRewireable fuse


bIsolator


cOil circuit breaker


d Air break circuit breaker


View Answer Rewireable fuse

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