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HRC fuses provide best protection against

short circuits
reverse current
overload
open circuits

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Current chopping mainly occurs in

air-blast circuit breaker
vaccum circuit breaker
oil circuit breaker
sf 6 circuit breaker

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A fuse element is generally made of

brass
silver
iron
steel

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

oil circuit breaker
all are correct
air-blast circuit breaker
vaccum circuit breaker

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The advantage of HRC fuse is that it

does not deteriorate with age
All of these
is quite cheap
has high speed of operation

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The single phasing relays are used for the protection of

three phase motors
single phase motors only
two phase motors only
two single phase motors running in parallel

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