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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
The form factor is the ratio of

Average value to r.m.s. value
None of these
Peak value to r.m.s. value
r.m.s. value to average value

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AC Fundamentals, Circuit and Circuit Theory
The best place to install a capacitor is

Any of the listed here
Very near to inductive load
Far away from the inductive load
Across the terminals of the inductive load

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AC Fundamentals, Circuit and Circuit Theory
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is

60 sin 25 t
42.42 sin 314 t
84.84 sin 3141
60 sin 50 t

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AC Fundamentals, Circuit and Circuit Theory
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of

Capacitive effect between adjacent coil turns
Skin effect
Iron loss in core
Increase in temperature

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AC Fundamentals, Circuit and Circuit Theory
Two waves of the same frequency have opposite phase when the phase angle between them is

0°
90°
360°
180°

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