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The transient voltage that appears across the contacts at the instant of arc extinction is called
recovery voltage
peak voltage
supply voltage
restriking voltage
recovery voltage
peak voltage
supply voltage
restriking voltage
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For interrupting of high voltage and low current, the circuit breaker prefered is
oil circuit breaker
vaccum circuit breaker
all are correct
air-blast circuit breaker
oil circuit breaker
vaccum circuit breaker
all are correct
air-blast circuit breaker
Answer
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Circuit breakers usually operate under
after dc component has ceased
transient state of short circuit current
steady state of short circuit current
sub-transient state of short circuit current
after dc component has ceased
transient state of short circuit current
steady state of short circuit current
sub-transient state of short circuit current
Answer
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The main function of a fuse is to
prevent excessive currents
None of these
open the circuit
protect the appliance
protect the line
prevent excessive currents
None of these
open the circuit
protect the appliance
protect the line
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When the circuit breaker operates under fault conditions, the greatest noise is produced in
oil circuit breaker
vaccum circuit breaker
sf6 circuit breaker
air-blast circuit breaker
oil circuit breaker
vaccum circuit breaker
sf6 circuit breaker
air-blast circuit breaker
Answer
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To protect most of the electrical equipment handling low power, the types of relays used are
Thermocouple
Electronic and bimetallic
Both of the listed here
None of these
Thermocouple
Electronic and bimetallic
Both of the listed here
None of these
Answer
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