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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 VR
VC and VL
None of these

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AC Fundamentals, Circuit and Circuit Theory
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will

Be four times as high
Be reduced to one fourth
Be doubled
Be reduced by half

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

Inductance only
Capacitance only
Resistance only
None of the listed here

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AC Fundamentals, Circuit and Circuit Theory
In any A.C. circuit always

Apparent power is more than actual power
Reactive power is more than apparent power
Actual power is more than reactive power
Reactive power is more than actual power

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AC Fundamentals, Circuit and Circuit Theory
In a circuit containing R, L and C, power loss can take place in

Inductance only
All of the listed here
Resistance 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?

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

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