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If the length of the arc in a circuit breaker increases, its resistance
increases
remains same
None of these
decreases
increases
remains same
None of these
decreases
Answer
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An isolator is installed
always independent of the position of circuit breaker
to operate the relay of circuit breaker
generally on both sides of a circuit breaker
as a substitute for circuit breaker
always independent of the position of circuit breaker
to operate the relay of circuit breaker
generally on both sides of a circuit breaker
as a substitute for circuit breaker
Answer
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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is
25 A
6.25 A
12.5 A
3.125 A
25 A
6.25 A
12.5 A
3.125 A
Answer
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To protect most of the electrical equipment handling low power, the types of relays used are
Electronic and bimetallic
Both of the listed here
Thermocouple
None of these
Electronic and bimetallic
Both of the listed here
Thermocouple
None of these
Answer
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A short-circuit is identified by
no current flow
voltage drop
heavy current flow
voltage rise
no current flow
voltage drop
heavy current flow
voltage rise
Answer
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Directional relay are based on flow of
current
power
voltage wave
All of these
current
power
voltage wave
All of these
Answer
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