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The power loss is an important factor for the design of

generator
transmission line
feeder
motor

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

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

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SF6 gas

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

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Current chopping mainly occurs in

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

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The relay operating speed depends upon

armature core air gap
the rate of flux built up
All of these
the spring tension

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The time-current graph of a fuse

None of these
has inverse characteristic
is a circle
has a linear characteristic

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