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AC Fundamentals, Circuit and Circuit Theory

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

Resistance
Capacitance
Both of the listed here
Inductance

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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
25
10
5

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AC Fundamentals, Circuit and Circuit Theory
Ohm is unit of all of the following except

Resistance
Inductive reactance
Capacitance
Capacitive reactance

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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

60°
30°
90°
180°

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AC Fundamentals, Circuit and Circuit Theory
Time constant of a circuit is the time in seconds taken after the application of voltage to each

50% of maximum value
25% of maximum value
63% of maximum value
90% of the maximum value

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AC Fundamentals, Circuit and Circuit Theory
Two waves of the same frequency have opposite phase when the phase angle between them is

360°
180°
90°
0°

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