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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The time constant of a series R-C circuit is given by____________?
The time constant of a series R-C circuit is given by____________?A. R/C
B. RC2
C. RC
D. R2CA sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.
A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.A. 100 n
B. 50 jt
C. 25 JT
D. 5 nTime 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 resistanceInductance of coil___________?
Inductance of coil___________?A. is unaffected by the supply frequency
B. decreases with the increase in supply frequency
C. increases with the increase in supply frequency
D. becomes zero with the increase in supply frequencySkin effect occurs when a conductor carries current at_______ frequencies
Skin effect occurs when a conductor carries current at_______ frequenciesA. very low
B. low
C. medium
D. highAt _______ frequencies the parallel R-L circuit behaves as purely resistive
At _______ frequencies the parallel R-L circuit behaves as purely resistiveA. low
B. very low
C. high
D. very high