 A. Very low
 B. Low
 C. Medium
 D. High
A.C. Fundamentals, Circuits and Circuit Theory

Skin effect occurs when a conductor carries current at _____ frequencies.

The form factor is the ratio of_____.
 A. Peak value to r.m.s. value
 B. r.m.s. value to average value
 C. Average value to r.m.s. value
 D. None of the above

Which of the following coil will have large resonant frequency?
 A. A coil with large resistance
 B. A coil with low resistance
 C. A coil with large distributed capacitance
 D. A coil with low distributed capacitance

Which of the following refers to a parallel circuit?
 A. The current through each element is same
 B. The voltage across element is in proportion to it’s resistance value
 C. The equivalent resistance is greater than any one of the resistors
 D. The current through any one element is less than the source current

In a series LC circuit at the resonant frequency the_____.
 A. Current is maximum
 B. Current is minimum
 C. Impedance is maximum
 D. Voltage across C is minimum

When an alternating current passes through an ohmic resistance the electrical power converted into heat is_____.
 A. Apparent power
 B. True power
 C. Reactive power
 D. None of the above

The r.m.s. value of pure cosine function is_____.
 A. 0.5 of peak value
 B. 0.707 of peak value
 C. Same as peak value
 D. Zero

The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that_____.
 A. Both waves must have same frequency
 B. Both waves must have identical peak values
 C. Both waves must have zero value at the same time
 D. None of the above

If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?
 A. 42.42 sin 314 t
 B. 60 sin 25 t
 C. 30 sin 50 t
 D. 84.84 sin 25 t

The period of a wave is_____.
 A. The same as frequency
 B. Time required to complete one cycle
 C. Expressed in amperes
 D. None of the above