Electrical Engineering MCQs

Page No. 161

In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?


a have low contact resistance


bbe clean and smooth


cbe of sufficient size and proper shape


d have all above properties



Thermal overload relays are used to protect the motor against over current due to____________?


ashort-circuits


bheavy loads


cgrounds


dall of the above


View Answer heavy loads

Overload relays are of_______________type


ainduction


b solid state


cthermal


dall above


View Answer all above

A thermal protection switch can protect against_____________?


a short-circuit


b temperature


coverload


dover voltage


View Answer overload

SF6 gas______________?


ais yellow in colour


b is lighter than air


c is nontoxic


dhas pungent small


View Answer is nontoxic

Which of the following medium is employed for extinction of arc in air circuit breaker?


aWater


bOil


cAir


dSF6


View Answer Air

On which of the following routine tests are conducted ?


aOil circuit breakers


bAir blast circuit breakers


cMinimum oil circuit breakers


dAll of the above


View Answer All of the above

The arcing contacts in a circuit breaker are made of______________?


acopper tungsten alloy


bporcelain


celectrolytic copper


daluminium alloy


View Answer copper tungsten alloy

Arc in a circuit behaves as_______________?


aa capackive reactance


ban inductive reactance


ca resistance increasing with voltage rise across the arc


da resistance decreasing with voltage rise across the arc



Fault diverters are basically____________?


afuses


brelays


cfast switches


dcircuit breakers


View Answer fast switches

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