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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

12 kVAR
8 kVAR
16 kVAR
10 kVAR

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AC Fundamentals, Circuit and Circuit Theory
In a pure resistive circuit

Current can lead or lag the voltage by 90°
Current is in phase with the voltage
Current lags behind the voltage by 90°
None of the listed here

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AC Fundamentals, Circuit and Circuit Theory
Form factor for a sine wave is

1.11
0.637
1.414
0.707

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AC Fundamentals, Circuit and Circuit Theory
In a loss-free R-L-C circuit the transient current is

Square wave
Non-oscillating
Oscillating
Sinusoidal

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AC Fundamentals, Circuit and Circuit Theory
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of

Skin effect
Capacitive effect between adjacent coil turns
Iron loss in core
Increase in temperature

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AC Fundamentals, Circuit and Circuit Theory
Power factor of the following circuit will be unity

Capacitance
None of the listed here
Resistance
Inductance

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