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

21.  An R-L-C series circuit has f₁ and f₂ as the resonant frequency. The selectivity of the circuit is given by

   A. f₁ + f₂/f_r

   B. f₂ - f₁/2f_r

   C. f₂ - f₁/f_r

   D. None of the above

22.  In an R-L-C series resonance circuit, if inductance of the circuit is made double and the capacitance is made half, which of the following will be affected ?

   A. Resonant frequency

   B. Selectivity of the circuit

   C. Current at resonant frequency

   D. Impedance at resonant frequency

23.  When resonant frequency for an R-L-C parallel circuit is given by 1/2 pi root LC, the essential condition is that

   A. Inductance must be non-resistive

   B. Capacitance must be non-leaky

   C. Current is minimum at resonance

   D. All of the above

24.  A series R-L-C circuit is switched on to a step voltage V at t = 0. What are the initial and final values of the current in the circuit, respectively?

   A. V/R , V/R

   B. Zero, infinity

   C. Zero, Zero

   D. Zero, V/R

25.  A parallel circuit is said to be in resonance when the admittance is purely

   A. Capacitive

   B. Inductive

   C. Susceptive

   D. Conductive

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