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AC Fundamentals, Circuit and Circuit Theory

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

VL and VR
VC and VL
None of these
VC and VR

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

High
Medium
Low
Very low

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AC Fundamentals, Circuit and Circuit Theory
The time constant of a series R-C circuit is given by

RC
RC2
R2C
R/C

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AC Fundamentals, Circuit and Circuit Theory
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is

36 kW
80 kW
32 kW
40 kW

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AC Fundamentals, Circuit and Circuit Theory
Form factor for a sine wave is

1.414
0.637
1.11
0.707

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AC Fundamentals, Circuit and Circuit Theory
The voltage of domestic supply is 220 V. This figure represents

Average value
Peak value
Mean value
R.m.s. value

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