A. to operate the relay of circuit breaker
B. as a substitute for circuit breaker
C. always independent of the position of circuit breaker
D. generally on both sides of a circuit breaker
Related Mcqs:
- Fault diverters are basically____________?
A. fuses
B. relays
C. fast switches
D. circuit breakers - A thermal protection switch can protect against_____________?
A. short-circuit
B. temperature
C. overload
D. over voltage - Protective relays are devices that detect abnormal conditions in electrical circuits by measuring_____________?
A. current during abnormal condition
B. voltage during abnormal condition
C. constantly the electrical quantities which differ during normal and abnormal conditions
D. none of the above - Circuit breakers are essentially______________?
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 - The time of closing the cycle, in modern circuit breakers is_____________?
A. 0.003 sec
B. 0.001 sec
C. 0.01 sec
D. 0.10 sec
E. none of the above - Short-circuit currents are due to_______________?
A. single phase to ground faults
B. phase to phase faults
C. two phase to ground faults
D. three phase faults
E. any of these - 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 devices will receive voltage surge first travelling on the transmission line ?
A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear - The inductive interference between power and communication line can be minimized by__________?
A. transposition of the power line
B. transposition of the communication line
C. both (A) and (B)
D. increasing the distance between the conductors - On which of the following effects of electric current a fuse operates ?
A. Photoelectric effect
B. Electrostatic effect
C. Heating effect
D. Magnetic effect
