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A fuse element is generally made of
steel
iron
brass
silver
steel
iron
brass
silver
Answer
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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
current wave only
voltage wave only
both current wave and voltage wave
power factor wave only
Answer
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The arc voltage produced in AC circuit breaker is always
None of these
In phase with the arc current
lagging the arc current by 90°
leading the arc current by 90°
None of these
In phase with the arc current
lagging the arc current by 90°
leading the arc current by 90°
Answer
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HRC fuses provide best protection against
open circuits
reverse current
overload
short circuits
open circuits
reverse current
overload
short circuits
Answer
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Arc in a circuit breaker behaves as
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
an inductive reactance
a capacitive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
an inductive reactance
a capacitive reactance
Answer
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The operating time of a fuse is about
0.8 sec
0.002 sec
1 sec
1.5 sec
0.8 sec
0.002 sec
1 sec
1.5 sec
Answer
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