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SF 6 gas

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

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

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

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The operating time of a fuse is about

0.002 sec
1.5 sec
0.8 sec
1 sec

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For which of the following protection from negative sequence currents is provided ?

Motors
Generators
Transmission line
Transformers

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SF6 gas

is nontoxic
has pungent small
is yellow in colour
None of these
is lighter than air

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The information to the circuit breaker under fault conditions is provided by

All of these
H.R.'only
relay
rewirable fuse

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