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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.

10
2.5
15
5

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AC Fundamentals, Circuit and Circuit Theory
The ratio of active power to apparent power is known as factor.

Form
Load
Demand
Power

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AC Fundamentals, Circuit and Circuit Theory
The peak value of a sine wave is 200 V. Its average value is

141.4 V
282.8 V
200 V
127.4 V

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

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

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AC Fundamentals, Circuit and Circuit Theory
For a sine wave with peak value Emax ___________ the average value is

0.707 Emax
0.636 Emax
None of the listed here
0.434 Emax

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