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The voltage appearing across the contacts after opening of the circuit breaker is called
operating voltage
arc voltage
surge voltage
recovery voltage
operating voltage
arc voltage
surge voltage
recovery voltage
Answer
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If the fault occurs near the impedance relay, the V/ I ratio will be
higher than that of if fault occurs away from the relay
None of these
Lower than that of if fault occurs away from the relay
constant for all distances
higher than that of if fault occurs away from the relay
None of these
Lower than that of if fault occurs away from the relay
constant for all distances
Answer
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SF6 gas
is yellow in colour
has pungent small
is nontoxic
is lighter than air
None of these
is yellow in colour
has pungent small
is nontoxic
is lighter than air
None of these
Answer
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HRC fuses provide best protection against
overload
reverse current
short circuits
open circuits
overload
reverse current
short circuits
open circuits
Answer
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To protect most of the electrical equipment handling low power, the types of relays used are
Thermocouple
Both of the listed here
None of these
Electronic and bimetallic
Thermocouple
Both of the listed here
None of these
Electronic and bimetallic
Answer
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The single phasing relays are used for the protection of
three phase motors
two phase motors only
single phase motors only
two single phase motors running in parallel
three phase motors
two phase motors only
single phase motors only
two single phase motors running in parallel
Answer
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