Capacitors for power factor correction are rated in_________?
Capacitors for power factor correction are rated in_________?
A. kW
B. kVA
C. kV
D. kVAR
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The frequency of an alternating current is____________?
The frequency of an alternating current is____________?A. the speed with which the alternator runs
B. the number of cycles generated in one minute
C. the number of waves passing through a point in one second
D. the number of electrons passing through a point in one secondThe phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is thatA. both waves must have same frequency
B. both waves must have identical peak values
C. both waves must have zero value at the same time
D. none of the aboveThe time constant of the capacitance circuit is defined as the time during which voltage________?
The time constant of the capacitance circuit is defined as the time during which voltage________?A. falls to 36.8% of its final steady value
B. rises to 38.6% of its final steady value
C. rises to 63.2% of its final steady value
D. none of the aboveIn a circuit containing R, L and C, power loss can take place in____________?
In a circuit containing R, L and C, power loss can take place in____________?A. C only
B. L only
C. R only
D. all aboveTime constant of an inductive circuit___________?
Time constant of an inductive circuit___________?A. increases with increase of inductance and decrease of resistance
B. increases with the increase of inductance and the increase of resistance
C. increases with decrease of inductance and decrease of resistance
D. increases with decrease of inductance and increase of resistancePower factor of the system is kept high__________?
Power factor of the system is kept high__________?A. to reduce line losses
B. to maximise the utilization of the capacities of generators, lines and transformers
C. to reduce voltage regulation of the line
D. due to all above reasons