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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

10 kVAR
16 kVAR
8 kVAR
12 kVAR

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AC Fundamentals, Circuit and Circuit Theory
In a series resonant circuit, the impedance of the circuit is

Zero
None of these
Maximum
Minimum

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AC Fundamentals, Circuit and Circuit Theory
At __________ frequencies the parallel R-L circuit behaves as purely resistive.

Very low
Very high
High
Low

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AC Fundamentals, Circuit and Circuit Theory
Skin effect occurs when a conductor carries current at _________ frequencies.

Very low
Low
Medium
High

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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

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

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AC Fundamentals, Circuit and Circuit Theory
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

A sinusoid of double the frequency
A sinusoid of half the original frequency
None of the listed here
A sinusoid of the same frequency

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