Switchgear Protections MCQ Questions & Answers | Electrical Engineering

A. In phase with the arc current

B. Lagging the arc current by 90°

C. Leading the arc current by 90°

D. None of the above

A. current carrying contacts called electrodes

B. arc extinguishers

C. circuits to break the system

D. transformers to isolate the two systems

E. any of the above

A. transposing transmission as well as communication lines

B. increasing the height of the trans-mission line tower

C. increasing the distance between the two lines

D. all of the above

A. Inrush protection

B. Distance protection

C. Time graded and current graded over current protection

D. Both (B) and (C)

A. Rewireable fuse

B. Isolator

C. Oil circuit breaker

D. Air break circuit breaker

E. None of the above

A. merz price percentage differential protection

B. mho and ohm relays

C. horn gaps and temperature relays

D. earth fault and positive sequence relays

A. mechanical vibration

B. insulation failure

C. loose connection

D. impulse voltage

A. hydro-electric generators

B. steam turbine generators

C. gas turbine generators

D. all of the above

E. none of the above

A. distribution transformer

B. generator transformer of the power plant

C. auto-transformer of the power plant

D. station transformer of the power plant

A. single bus

B. double bus, double breaker

C. main and transfer bus

D. all of the above