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The operating time of a fuse is about

1 sec
0.002 sec
1.5 sec
0.8 sec

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The advantage of HRC fuse is that it

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

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The arcing contacts in a circuit breaker are made of

porcelain
electrolytic copper
aluminium alloy
copper tungsten alloy

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Which of the following is the least expensive protection for over current is low voltage system ?

rewireable fuse
oil circuit breaker
isolator
air break circuit breaker

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An efficient and a well designed protective relaying should have

high speed and selectivity
economy and simplicity
good selectivity and reliability
All of these

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A fuse element is generally made of

brass
iron
steel
silver

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