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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
Time constant of a circuit is the time in seconds taken after the application of voltage to each

63% of maximum value
50% of maximum value
90% of the maximum value
25% of maximum value

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AC Fundamentals, Circuit and Circuit Theory
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

Both waves must have identical peak values
Both waves must have same frequency
Both waves must have zero value at the same time
None of these

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

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AC Fundamentals, Circuit and Circuit Theory
The ratio of active power to apparent power is known as factor.

Load
Power
Demand
Form

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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?

VC and VR
VL and VR
None of the listed here
VC and VL

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AC Fundamentals, Circuit and Circuit Theory
The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be

100 V
141.4 V
282.8 V
111 V

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