Switchgear protections Archives

1. Wave trap is used to trap waves of

power frequencies

higher frequencies entering generator or transformer units

either of the above

none of the above

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2. Circuit breakers are essentially

current carrying contacts called electrodes

arc extinguishers

circuits to break the system

Detailed SolutionCircuit breakers are essentially

3. SF6 gas

Is yellow in colour

Is lighter than air

Is nontoxic

Has pungent small E. None of the above

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4. Induction cup relay is operated due to changes in

current

voltage

impedance

all of the above

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5. The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

recovery

surge

operating

arc E. none of the above

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6. A fuse is connected

in series with circuit

in parallel with circuit

either in series or in parallel with circuit

none of the above

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7. Overload relays are of type.

induction

solid state

thermal

electromagnetic E. all above

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8. The delay fuses are used for the protection of ________ .

motors

power outlet circuits

fluorescent lamps

light circuits

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