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

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bbe clean and smooth

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cbe of sufficient size and proper shape

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d have all above properties

✓



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


ashort-circuits

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bheavy loads

✓


cgrounds

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dall of the above

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View Answer heavy loads

Overload relays are of_______________type


ainduction

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b solid state

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cthermal

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dall above

✓


View Answer all above

A thermal protection switch can protect against_____________?


a short-circuit

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b temperature

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coverload

✓


dover voltage

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View Answer overload

SF6 gas______________?


ais yellow in colour

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b is lighter than air

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c is nontoxic

✓


dhas pungent small

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View Answer is nontoxic

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


aWater

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bOil

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cAir

✓


dSF6

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View Answer Air

On which of the following routine tests are conducted ?


aOil circuit breakers

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bAir blast circuit breakers

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cMinimum oil circuit breakers

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dAll of the above

✓


View Answer All of the above

The arcing contacts in a circuit breaker are made of______________?


acopper tungsten alloy

✓


bporcelain

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celectrolytic copper

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daluminium alloy

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View Answer copper tungsten alloy

Arc in a circuit behaves as_______________?


aa capackive reactance

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ban inductive reactance

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ca resistance increasing with voltage rise across the arc

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da resistance decreasing with voltage rise across the arc

✓



Fault diverters are basically____________?


afuses

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brelays

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cfast switches

✓


dcircuit breakers

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View Answer fast switches

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