Question

Given, R = 10 Ω, L = 100 mH and C = 10 μF. Selectivity is?

(a) 10

(b) 1.2

(c) 0.15

(d) 0.1

This question was posed to me in an internship interview.

Query is from Problems of Series Resonance Involving Frequency Response of Series Resonant Circuit topic in section Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

Correct answer is (d) 0.1

To explain: Selectivity = \(\frac{1}{Q}\)

Q = \(\frac{ωL}{R} = \frac{1000×100×10^{-3}}{10}\)

∴ Q = 10

So, Selectivity = 0.1.