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AC Fundamentals, Circuit and Circuit Theory

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

R2C
RC
R/C
RC2

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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 the listed here
VC and VR
VC and VL
VL and VR

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AC Fundamentals, Circuit and Circuit Theory
Inductance of coil

Becomes zero with the increase in supply frequency
Is unaffected by the supply frequency
Decreases with the increase in supply frequency
Increases with the increase in supply frequency

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

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

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AC Fundamentals, Circuit and Circuit Theory
What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

90°
30°
180°
45°

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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.

100 n
50 jt
5 n
25 JT

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