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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
In a series L-C circuit at the resonant frequency the

Current is maximum
Voltage across C is minimum
Current is minimum
Impedance is maximum

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AC Fundamentals, Circuit and Circuit Theory
A sine wave has a frequency of 50 Hz. Its angular frequency is __________ radian/second.

50 jt
100 n
5 n
25 JT

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AC Fundamentals, Circuit and Circuit Theory
A parallel AC. circuit in resonance will

Act like a resistor of low value
Have current in each section equal to the line current
Have a high impedance
Have a high voltage developed across each inductive and capacitive section

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AC Fundamentals, Circuit and Circuit Theory
The power factor of a D.C. circuit is always

Unity
Zero
Less than unity
Greater than unity

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AC Fundamentals, Circuit and Circuit Theory
In an AC. circuit, a low value of kVAR compared with kW indicates

High power factor
Low efficiency
Maximum load current
Unity power factor

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

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