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A fuse should have

All of these
low melting point
low cost
high conductivity

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The operating time of a circuit breaker is

0.05 sec
0.002 sec
0.001 sec
0.2 sec

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When transmission line is energized, the wave that propagates on it is

current wave only
voltage wave only
both current wave and voltage wave
power factor wave only

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The arcing contacts in a circuit breaker are made of

copper tungsten alloy
porcelain
electrolytic copper
aluminium alloy

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

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

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The time-current graph of a fuse

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

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