SWITCH GEAR QUIZ

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

All of these

lubricate the contacts

extinguish the arc

insulate the contacts from switch body

None of these

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Current chopping mainly occurs in

vaccum circuit breaker

air-blast circuit breaker

oil circuit breaker

sf 6 circuit breaker

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A fuse should have

low cost

All of these

low melting point

high conductivity

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To limit short-circuit current in a power system are used

H.R. fuses

earth wires

isolators

reactors

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Admittance relay is

directional relay

None of these

non-directional relay

impedance relay

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

25 A

6.25 A

12.5 A

3.125 A

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Air blast circuit breaker is used for

repeated duty

short duty

intermittent duty

over currents

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The advantage of HRC fuse is that it

has high speed of operation

All of these

does not deteriorate with age

is quite cheap

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________ relay is preferred for phase fault on short transmission line.

Impedance

Reactance

Induction type

None of these

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For interrupting of high voltage and low current, the circuit breaker prefered is

air-blast circuit breaker

all are correct

oil circuit breaker

vaccum circuit breaker

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