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A fuse should have

low melting point
low cost
All of these
high conductivity

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Relay can be designed to respond to changes in

voltage and current
All of these
temperature
resistance, reactance and impedance

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SF 6 gas

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

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A circuit breaker is a

None of these
circuit interrupting device
current controlling device
current limiting device

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In Railway applications ______ circuit breaker is used.

bulk oil
SFe
air break
minimum oil

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The torque produced in induction type relay is

inversely proportional to the current
proportional to the current
proportional to square of the current
inversely proportional to the square of the current

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