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AC Fundamentals, Circuit and Circuit Theory

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
90% of the maximum value
63% of maximum value

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AC Fundamentals, Circuit and Circuit Theory
For the same peak value which of the following wave will 'have the highest r.m.s. value?

Half wave rectified sine wave
Triangular wave
Square wave
Sine wave

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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.

10
5
25
15

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AC Fundamentals, Circuit and Circuit Theory
In a series L-C circuit at the resonant frequency the

Impedance is maximum
Voltage across C is minimum
Current is maximum
Current is minimum

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AC Fundamentals, Circuit and Circuit Theory
Power factor of an electrical circuit is equal to

Cosine of phase angle difference between current and voltage
Ratio of useful current to total current Iw/I
all of these
R/Z

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AC Fundamentals, Circuit and Circuit Theory
Power factor of an inductive circuit is usually improved by connecting capacitor to it in

None of the listed here
Series
Parallel
Both parallel and series

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