A. above 30 kVA.
B. equal to and above 5 MVA
C. equal to and above 25 MVA
D. none of the above
Related Mcqs:
- Over voltage protection is recommended for______________?
A. hydro-electric generators
B. steam turbine generators
C. gas turbine generators
D. all of the above
E. none of the above - 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 - The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
A. heavy loads
B. internal short-circuits
C. external short-circuits
D. all of the above - A differential relay measures the vector difference between_________________?
A. two currents
B. two voltages
C. two or more similar electrical quantities
D. none of the above - Which of the following is the least expensive protection for overcurrent is low voltage system ?
A. Rewireable fuse
B. Isolator
C. Oil circuit breaker
D. Air break circuit breaker
E. None of the above - For which of the following protection from negative sequence currents is provided ?
A. Generators
B. Motors
C. Transmission line
D. Transformers - 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 - The delay fuses are used for the protection of ___________?
A. motors
B. power outlet circuits
C. fluorescent lamps
D. light circuits - 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
