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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 Q. If frequency is increased to 100 Hz, reactance becomes __________ ohms.

2.5
5
10
15

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AC Fundamentals, Circuit and Circuit Theory
Inductance affects the direct current flow

At all the time of operation
Only at the time of turning off
Only at the time of turning on
At the time of turning on and off

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of ________ degrees.

30
45
60
90

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AC Fundamentals, Circuit and Circuit Theory
Which of the following statements pertains to resistors only?

Oppose sudden changes in voltage
Can act as energy storage devices
Can dissipate considerable amount of power
Connecting them in parallel increases the total value

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AC Fundamentals, Circuit and Circuit Theory
Which of the following coil will have large resonant frequency?

A coil with large resistance
A coil with low resistance
A coil with large distributed capacitance
A coil with low distributed capacitance

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AC Fundamentals, Circuit and Circuit Theory
All definitions of power factor of a series R-L-C circuit are correct except

Ratio of net reactance and impedance
Ratio of kW and kVA
Ratio of J and Z
Ratio of W and VA

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