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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

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

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AC Fundamentals, Circuit and Circuit Theory
For the same peak value which of the following wave will 'have the highest r.m.s. value?

Square wave
Sine wave
Triangular wave
Half wave rectified sine wave

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AC Fundamentals, Circuit and Circuit Theory
When an alternating current passes through an ohmic resistance the electrical power converted into heat is

Reactive power
Apparent power
None of the listed here
Active power

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

Reactive power is more than apparent power
Apparent power is more than actual 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
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 phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

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

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