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AC Fundamentals, Circuit and Circuit Theory

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?

45°
180°
90°
30°

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AC Fundamentals, Circuit and Circuit Theory
In a highly capacitive circuit the

Reactive power is more than the actual power
Reactive power is more than the apparent power
Actual power is more than its reactive power
Apparent power is equal to the actual power

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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?

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

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AC Fundamentals, Circuit and Circuit Theory
Inductance of coil

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

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AC Fundamentals, Circuit and Circuit Theory
Which of the following coil will have large resonant frequency?

A coil with low distributed capacitance
A coil with large distributed capacitance
A coil with low resistance
A coil with large resistance

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AC Fundamentals, Circuit and Circuit Theory
In AC. circuits, laminated iron is invariably used in order to

Reduce circuit permeability
Make assembly cheap and easier
Increase heat radiation
Reduce eddy current loss

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