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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The power consumed in a circuit element will be least when the phase difference between the current and voltage is

60°
30°
90°
180°

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AC Fundamentals, Circuit and Circuit Theory
For a sine wave with peak value Imax the r.m.s. value is

0.707
0.5 Imax
1.414 Imax
0.9

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AC Fundamentals, Circuit and Circuit Theory
Capacitors for power factor correction are rated in

kVA
kV
kW
kVAR

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be

100 V
282.8 V
111 V
141.4 V

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

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

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AC Fundamentals, Circuit and Circuit Theory
In an AC. circuit, a low value of kVAR compared with kW indicates

High power factor
Unity power factor
Low efficiency
Maximum load current

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