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The power loss is an important factor for the design of

generator
feeder
transmission line
motor

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The short circuit in any winding of the transformer is the result of

impulse voltage
insulation failure
mechanical vibration
loose connection

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

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

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HRC fuses provide best protection against

reverse current
open circuits
overload
short circuits

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The time of closing the cycle, in modern circuit breakers is

0.003 sec
0.01 sec
0.001 sec
0.10 sec

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When a fault occur in a power system, the circuit breaker

opens automatically
is opened manually
is opened by remote control
None of these

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