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The reflection co-efficient at the open circuited end of a transmission line

unity
infinity
None of these
zero

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SF6 gas

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

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Air blast circuit breaker is used for

repeated duty
intermittent duty
over currents
short duty

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Relay can be designed to respond to changes in

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

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protection of fuses is generally not used beyond

20 A
50 A
200 A
100 A

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series reactors should have

low resistance
high impedance
high resistance
low impedance

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