Question

A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is _____________ (a) 25 (b) 50 (c) 100 (d) 200 I got this question by my college director while I was bunking the class. Origin of the question is Dot Convention in Magnetically Coupled Circuits topic in division Resonance & Magnetically Coupled Circuit of Network Theory Select the correct answer from above options network theory questions and answers, network theory questions pdf, network theory question bank, network theory gate questions and answers pdf, mcq on network theory pdf, gate network theory questions and solutions, network theory mcq Test , ies network theory questions, Network theory Questions for GATE EC Exam, Network Theory MCQ (Multiple Choice Questions)

Answer 1

Correct choice is (b) 50 Easiest explanation: Q = \frac{f_0}{BW} And f0 = 1/2π (LC)^0.5 BW = R/L Or, Q = \frac{1}{R} (\frac{L}{C})^{0.5} When R, L and C are doubled, Q’ = 50.