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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?

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

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AC Fundamentals, Circuit and Circuit Theory
All the rules and laws of D.C. circuit also apply to A.C. circuit containing

Capacitance only
All above
Resistance only
Inductance only

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AC Fundamentals, Circuit and Circuit Theory
In an A.C. circuit power is dissipated in

Resistance only
None of the listed here
Inductance only
Capacitance only

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AC Fundamentals, Circuit and Circuit Theory
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

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

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

RC
R2C
R/C
RC2

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AC Fundamentals, Circuit and Circuit Theory
All definitions of power factor of a series R-L-C circuit are correct except

Ratio of net reactance and impedance
Ratio of kW and kVA
Ratio of W and VA
Ratio of J and Z

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