relay is preferred for phase fault on short transmission line?
A. induction type
B. reactance
C. impedance
D. none of the above
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For which of the following ratings of the transformer differential protection is recommended ?
A. above 30 kva.
B. equal to and above 5 mva
C. equal to and above 25 mva
D. none of the above
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The short circuit in any winding of the transformer is the result of_______________?
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage
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The short circuit in any winding of the transformer is the result of______________?
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage
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Which of the following circuit breakers has high reliability and minimum maintenance ?
A. air blast circuit breakers
B. circuit breaker with sf6 gas
C. vacuum circuit breakers
D. oil circuit breakers
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Over voltage protection is recommended for______________?
A. hydro-electric generators
B. steam turbine generators
C. gas turbine generators
D. all of the above
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What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
A. zero
B. unity
C. infinity
D. none of the above
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Arc in a circuit breaker is interrupted at___________?
A. zero current
B. maximum current
C. minimum voltage
D. maximum voltage
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The single phasing relays are used for the protection of_____________?
A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors
Read more about this MCQ
Series reactors should have________________?
A. low resistance
B. high resistance
C. low impedance
D. high impedance
Read more about this MCQ
Word of the Day
14 Sep
Sovereignty
supreme power or authority.
اقتدار، حکومت، راج

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