# A.C. Fundamentals, Circuits and Circuit Theory

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

• A. Very low
• B. Low
• C. Medium
• D. High
Explanation:

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• ## 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
Explanation:

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• ## 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
Explanation:

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• ## 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
Explanation:

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• ## In a series L-C circuit at the resonant frequency the_____.

• A. Current is maximum
• B. Current is minimum
• C. Impedance is maximum
• D. Voltage across C is minimum
Explanation:

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• ## 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
Explanation:

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• ## 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
Explanation:

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• ## 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
Explanation:

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• ## 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
Explanation:

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• ## 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