AC Circuit - R-L-C Circuit objective questions (mcq) and answers

11.  A series R-L-C circuit draws a current at a leading power factor at

   A. More than resonant frequency

   B. Less than resonant frequency

   C. Resonant frequency

   D. None of the above

12.  In a series R-L-C circuit at resonance

   A. wLC = 1

   B. wL²C² = 1

   C. w²LC = 1

   D. w²L²C = 1

13.  The power factor of a series R-L-C circuit at its half-power points is

   A. Unity

   B. Lagging

   C. Leading

   D. Lagging or leading

14.  The dynamic impedance of an R-L and C parallel circuit at resonance is........ohm.

   A. R/LC

   B. C/LR

   C. LC/ R

   D. L/ CR

15.  In an RLC circuit, supplied from an AC source, the reactive power is proportional to the

   A. Average energy stored in the electric field

   B. Average energy stored in the magnetic field

   C. Some of the average energy stored in the electric field and that stored in the magnetic field

   D. Difference between the average energy stored in the electric field and that stored in the magnetic field

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