Question

For the tank circuit shown below, find the resonant frequency.

(a) 157.35

(b) 158.35

(c) 159.35

(d) 160.35

The question was posed to me during a job interview.

My question is from Resonant Frequency for a Tank Circuit in section Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

Right answer is (b) 158.35

To explain I would say: The parallel resonant circuit is generally called a tank circuit because of the fact that the circuit stores energy in the magnetic field of the coil and in the electric field of the capacitor. The resonant frequency fr = (1/2π) √((1/LC)-(R^2/L^2)).