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A fuse element is generally made of

iron
silver
brass
steel

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

oil circuit breaker
rewireable fuse
air break circuit breaker
isolator

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The advantage of HRC fuse is that it

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

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SF 6 gas

Is nontoxic
is lighter than air
has pungent small
is yellow in colour

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Back up protection is generally used for protection against

open-circuit faults only
None of these
both open and short-circuit faults
short-circuit faults only

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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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