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AC Fundamentals, Circuit and Circuit Theory

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?

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

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AC Fundamentals, Circuit and Circuit Theory
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

A sinusoid of double the frequency
A sinusoid of the same frequency
A sinusoid of half the original frequency
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?

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

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AC Fundamentals, Circuit and Circuit Theory
The main cause of silting up a channel,

Non-regime section
Inadequate slope
Defective head regulator
All of these

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AC Fundamentals, Circuit and Circuit Theory
Ohm is unit of all of the following except

Capacitance
Capacitive reactance
Inductive reactance
Resistance

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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 W and VA
Ratio of J and Z
Ratio of kW and kVA

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