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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohm. If frequency is increased to 100 Hz, reactance becomes __________ ohms.

15
10
5
25

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AC Fundamentals, Circuit and Circuit Theory
The time constant of the capacitance circuit is defined as the time during which voltage

Rises to 63.2% of its final steady value
Falls to 36.8% of its final steady value
None of these
Rises to 38.6% of its final steady value

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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

30°
60°
90°
180°

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

kVA
kW
kVAR
kV

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AC Fundamentals, Circuit and Circuit Theory
In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters?

220 V
None of these
220 v3 V
220/v3 V

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AC Fundamentals, Circuit and Circuit Theory
Inductance of coil

Is unaffected by the supply frequency
Increases with the increase in supply frequency
Becomes zero with the increase in supply frequency
Decreases with the increase in supply frequency

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