A. power frequencies
B. higher frequencies entering generator or transformer units
C. either of the above
D. none of the above
Related Mcqs:
- When a transmission line is energized, the wave that propagates on it is____________?
A. current wave only
B. voltage wave only
C. Both (A) and (B)
D. power factor wave only - When a wave propagates on a transmission line, it suffers reflection several times at_____________?
A. tapping
B. load end
C. sending end
D. sending and other end
E. all 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 - 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 - The delay fuses are used for the protection of ___________?
A. motors
B. power outlet circuits
C. fluorescent lamps
D. light circuits - For cost and safety, the outdoor substations are installed for voltages above_________________?
A. 11 kV
B. 33 kV
C. 60kV
D. 110kV - The relay with inverse time characteristic will operate within____________?
A. 1.5 sec
B. 5 to 10 sec
C. 5 to 20 sec
D. 20 to 30 sec
E. none of the above - To limit short-circuit current in a power system are used______________?
A. earth wires
B. isolators
C. H.R.C. fuses
D. reactors
