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
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
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
Over voltage protection is recommended for______________?
(A) hydro-electric generators
(B) steam turbine generators
(C) gas turbine generators
(D) all of the above
(D) none of the above
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
Arc in a circuit breaker is interrupted at___________?
(A) zero current
(B) maximum current
(C) minimum voltage
(D) maximum voltage
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
In a single bus-bar system there will be complete shut down when____________?
(A) fault occurs on the bus itself
(B) fault occurs on neutral line
(C) two or more faults occur simultaneously
(D) fault occurs with respect to earthing
Overfluxing protection is recommended for_____________?
(A) distribution transformer
(B) generator transformer of the power plant
(C) auto-transformer of the power plant
(D) station transformer of the power plant
If the fault occurs near the impedance relay, the VII ratio will be____________?
(A) constant for all distances
(B) lower than that of if fault occurs away from the relay
(C) higher than that of if fault occurs away from the relay
(D) none of the above