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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
A sine wave has a frequency of 50 Hz. Its angular frequency is __________ radian/second.

50 jt
5 n
100 n
25 JT

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AC Fundamentals, Circuit and Circuit Theory
In any A.C. circuit always

Reactive power is more than apparent power
Reactive power is more than actual power
Apparent power is more than actual power
Actual power is more than reactive power

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of pure cosine function is

Same as peak value
0.707 of peak value
0.5 of peak value
Zero

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AC Fundamentals, Circuit and Circuit Theory
The product of apparent power and cosine of the phase angle between circuit voltage and current is

Instantaneous power
Reactive power
Volt-amperes
True power

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AC Fundamentals, Circuit and Circuit Theory
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will

Be four times as high
Be reduced by half
Be doubled
Be reduced to one fourth

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AC Fundamentals, Circuit and Circuit Theory
Inductance of coil

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

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