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AC Fundamentals, Circuit and Circuit Theory

AC Fundamentals, Circuit and Circuit Theory
Skin effect occurs when a conductor carries current at _________ frequencies.

Low
Medium
High
Very low

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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?

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

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AC Fundamentals, Circuit and Circuit Theory
The square waveform of current has following relation between r.m.s. value and average value.

r.m.s. value of current is greater than average value
r.m.s. value is equal to average value
r.m.s. value of current is less than average value
None of these

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AC Fundamentals, Circuit and Circuit Theory
Pure inductive circuit takes power from the A.C. line when

Applied voltage decreases but current increases
Applied voltage increases but current decreases
Both applied voltage and current decrease
Both applied voltage and current increase

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AC Fundamentals, Circuit and Circuit Theory
Which of the following waves has the highest value of peak factor ?

Sine wave
Square wave
Triangular wave
Half wave rectified sine wave

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AC Fundamentals, Circuit and Circuit Theory
At very low frequencies a series R-C circuit behaves as almost purely

None of the listed here
Resistive
Inductive
Capacitive

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