A. Zero
B. Unity
C. Infinity
D. None of the above
A. zero current
B. maximum current
C. minimum voltage
D. maximum voltage
Arc in a circuit breaker is interrupted at___________? Read More »
Switchgear and Protection A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors
The single phasing relays are used for the protection of_____________? Read More »
Switchgear and Protection A. low resistance
B. high resistance
C. low impedance
D. high impedance
Series reactors should have________________? Read More »
Switchgear and Protection A. heavy loads
B. internal short-circuits
C. external short-circuits
D. all of the above
A. Inductance
B. Capacitance
C. Resistance
D. Reactance
Which of the following parameter can be neglected for a short line ? Read More »
Switchgear and Protection A. generators
B. busbars
C. transformers
D. motors
E. all of the above
The under voltage relay can be used for______________? Read More »
Switchgear and Protection A. Generators
B. Motors
C. Transmission line
D. Transformers
For which of the following protection from negative sequence currents is provided ? Read More »
Switchgear and Protection A. single bus
B. double bus, double breaker
C. main and transfer bus
D. all of the above
Bus coupler is very essential in arrangement______________? Read More »
Switchgear and Protection A. Lightning arrestors are used before the switchgear
B. Shunt reactors are used as compensation reactors
C. The peak short current is (1.8 xV2) times the A.C. component
D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance
Which of the following statements is incorrect ? Read More »
Switchgear and Protection