- A. Very low
- B. Low
- C. Medium
- D. High
A.C. Fundamentals, Circuits and Circuit Theory
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Skin effect occurs when a conductor carries current at _____ frequencies.
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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
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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
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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
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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
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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
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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
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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
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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
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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