For a sine wave with peak value Imax the r.m.s. value is_______?
For a sine wave with peak value Imax the r.m.s. value is_______?
A. 0.5 Imax
B. 0.707
C. 0.9
D. 1.414 Lmax
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A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?A. average voltage
B. r.m.s. voltage
C. peak voltage
D. none of the aboveThe input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?A. 12 kW
B. 22 kW
C. 32 kW
D. 64 kWIn a pure inductive circuit___________?
In a pure inductive circuit___________?A. the current is in phase with the voltage
B. the current lags behind the voltage by 90°
C. the current leads the voltage by 90°
D. the current can lead or lag by 90°Skin 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. highIn a series L-C circuit at the resonant frequency the__________?
In a series L-C circuit at the resonant frequency the__________?A. current is maximum
B. current is minimum
C. impedance is maximum
D. voltage across C is minimumAll the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?
All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?A. capacitance only
B. inductance only
C. resistance only
D. all above