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Admittance relay is

impedance relay
non-directional relay
directional relay
None of these

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The main function of a fuse is to

protect the line
open the circuit
prevent excessive currents
None of these
protect the appliance

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A differential relay measures the vector difference between

two or more similar electrical quantities
two currents
two voltages
None of these

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Air blast circuit breakers for 400 kV power system are designed to operate in

100 micro-second
0.1 sec
50 milli-second
0.5 sec

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SF 6 gas

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

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The transient voltage that appears across the contacts at the instant of arc extinction is called

restriking voltage
supply voltage
recovery voltage
peak voltage

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