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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

12 kVAR
10 kVAR
16 kVAR
8 kVAR

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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

Parallel
Both parallel and series
Series
None of the listed here

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AC Fundamentals, Circuit and Circuit Theory
The phosphors for which of the following pair are 180° out of phase for VL, VC and VR?

VC and VR
VC and VL
None of the listed here
VL and VR

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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
True power
Volt-amperes

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

Low
Very low
High
Very high

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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.

60
90
45
30

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