SWITCH GEAR QUIZ

A fuse element is generally made of

steel

silver

brass

iron

TRUE ANSWER : ?
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The relay operating coil is supplied through

power transformer

fuse

None of these

current transformer

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A switchgear is device used for

switching an electrical circuit 111

switching, controlling and protecting the electrical circuit and equipment

interrupting an electrical circuit

switching and controlling an electrical circuit

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If the length of the arc in a circuit breaker increases, its resistance

None of these

increases

remains same

decreases

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A differential relay measures the vector difference between

two voltages

two or more similar electrical quantities

None of these

two currents

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SF6 gas

is lighter than air

is nontoxic

is yellow in colour

has pungent small

None of these

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A _______ is used to measure the stator % winding temperature of the generator.

pyrometer

thermometer

thermocouple

resistance thermometer

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Series capacitors are used to

improve line voltage

None of these

compensate for line capacitive reactance

compensate for line inductive reactance

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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

6

8

2

4

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The fuse rating is expressed in terms of

VAR

kVA

current

voltage

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