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

16.  In a R-L-C circuit

A. Power is consumed in resistance only and is equal to I SquareR

B. Exchange of power does not take place between resistance and supply mains

C. Exchange of power take place between capacitor and supply mains

D. All of the above

D. All of the above

17.  Under the condition of resonance in R-L-C series circuit, the power factor of the circuit is

A. 0.5 lagging

C. Unity

D. Zero

C. Unity

18.  A series R-L-C circuit will have unity power factor if operated at a frequency of

A. 1/LC

B.1/w2 LC

C. 1/w2 LC

D. 1/ 2 Π √ LC

D. 1/ 2 Π √ LC

19.  In a series R-L-C circuit at resonance, the magnitude of voltage developed across the capacitor

A. Is always zero

B. Can never be greater than the input voltage

C. Can be greater than the input voltage however it is 90o out of phase with the input voltage

D. Can be greater than the input voltage and is in phase with the input voltage

C. Can be greater than the input voltage however it is 90o out of phase with the input voltage

20.  In a series R-L-C circuit, voltage across inductance will be maximum

A. At resonant frequency

B. Just after resonant frequency

C. Just before resonant frequency

D. Just before and after resonant frequency