The power factor of a D.C. circuit is always__________?
The power factor of a D.C. circuit is always__________?
A. less than unity
B. unity
C. greater than unity
D. zero
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Time constant of a capacitive circuit__________?
Time constant of a capacitive circuit__________?A. increases with the decrease of capacitance and decrease of resistance
B. increases with the decrease of capacitance and increase of resistance
C. increases with the increase of capacitance and decrease of resistance
D. increase with increase of capacitance and increase of resistanceThe 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 aboveThe 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 aboveIn the case of an unsymmetrical alternating current the average value must always be taken over__________?
In the case of an unsymmetrical alternating current the average value must always be taken over__________?A. unsymmetrical part of the wave form
B. the quarter cycle
C. the half cycle
D. the whole cycleA pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?A. the capacitive reactance in ohms
B. the current flowing in capacitor
C. the size of the capacitor being quite big
D. the statement is incorrectPower factor of an electrical circuit is equal to____________?
Power factor of an electrical circuit is equal to____________?A. R/Z
B. cosine of phase angle difference be-tween current and voltage
C. kW/kVA
D. ratio of useful current to total cur¬rent Iw/I
E. all of these