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HRC fuses provide best protection against

overload
short circuits
reverse current
open circuits

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Which of the following CB's is generally used in railways applications ?

low oil circuit breaker
bulk oil circuit breaker
sf 6 circuit breaker
air break circuit breaker

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The current rating of a fuse is 5A. The fusing current will be

2.5 A
5 A
1 A
more than 5A

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An isolator is designed to open a circuit under

None of these
no load
full load
normal conditions

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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

3.125 A
25 A
6.25 A
12.5 A

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A fuse should have

low melting point
low cost
high conductivity
All of these

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