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AC Fundamentals, Circuits and Circuit Theory MCQs
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AC Fundamentals, Circuits and Circuit Theory MCQs
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25 Questions

1. In any A.C. circuit always
2. Which of the following statements pertains to resistors only?
3. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,
4. The double energy transient occur in the 
5. Two waves of the same frequency have opposite phase when the phase angle between them is
6. In AC. circuits, laminated iron is invariably used in order to
7. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to
8. The period of a sine wave is _________ seconds. Its frequency is
9. Power factor of the system is kept high
10. The frequency of an alternating current is
11. The phosphors for which of the following pair are 180° out of phase for VL, VC and VR?
12. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be
13. Form Factor is the ratio of 
14. Power factor of the following circuit will be zero
15. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA. The power drawn by the circuit is
16. Power factor of an inductive circuit is usually improved by connecting capacitor to it in
17. A sine wave has a frequency of 50 Hz. Its angular frequency is _______ radian/second.
18. Ohm is unit of all of the following except
19. The period of a wave is
20. The power consumed in a circuit element will be least when the phase difference between the current and voltage is 
21. Power factor of electric bulb is
22. In an AC circuit, a low value of kVAR compared with kW indicates
23. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
24. Power factor of the following circuit will be unity
25. At __________ frequencies the parallel R-L circuit behaves as purely resistive.

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