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


✔ View Answer


B. Less than resonant frequency

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


   A. wLC = 1

   B. wL2C2 = 1

   C. w2LC = 1

   D. w2L2C = 1


✔ View Answer


C. w2LC = 1

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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


✔ View Answer


D. Lagging or leading

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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


✔ View Answer


D. L/ CR

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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


✔ View Answer


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

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