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Relay can be designed to respond to changes in
temperature
All of these
resistance, reactance and impedance
voltage and current
temperature
All of these
resistance, reactance and impedance
voltage and current
Answer
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Back up protection is generally used for protection against
None of these
short-circuit faults only
open-circuit faults only
both open and short-circuit faults
None of these
short-circuit faults only
open-circuit faults only
both open and short-circuit faults
Answer
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Current chopping mainly occurs in
sf 6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker
sf 6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker
Answer
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Arc in a circuit breaker behaves as
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
Answer
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A short-circuit is identified by
voltage drop
no current flow
voltage rise
heavy current flow
voltage drop
no current flow
voltage rise
heavy current flow
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An isolator is designed to open a circuit under
normal conditions
None of these
no load
full load
normal conditions
None of these
no load
full load
Answer
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