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. R2C
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Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?
Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?A. parallel
B. series
C. either A. or (b)
D. none of the aboveThe period of a sine wave is _____ seconds. Its frequency is
The period of a sine wave is _____ seconds. Its frequency isA. 20 Hz
B. 30 Hz
C. 40 Hz
D. 50 HzThe effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?A. iron loss in core
B. skin effect
C. increase in temperature
D. capacitive effect between adjacent coil turnsInductance 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 frequencyThe 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 aboveInductance of a coil Varies__________?
Inductance of a coil Varies__________?A. directly as the cross-sectional area of magnetic core
B. directly as square of number of turns
C. directly as the permeability of the core
D. inversely as the length of the iron path
E. as A. to (d)