Question

In a series resonance type BPF, C = 1.8 pf, L = 25 mH, RF = 52 Ω and RL = 9 kΩ. The Bandwidth is ___________ (a) 331 kHz (b) 575 kHz (c) 331 Hz (d) 575 Hz The question was posed to me during an interview. The origin of the question is Problems of Series Resonance Involving Quality Factor in section 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 option is (c) 331 Hz To elaborate: R = \frac{R_f×R_L}{R_f+R_L} ≈ 52 Ω ∴ Qfactor = \frac{ω_r L}{R} = \frac{2π×751×25×10^{-3}}{52} = \frac{π×37580}{52} = 2270 Now, BW = \frac{f_r}{Q} = \frac{751 × 10^3}{2270} ∴ BW = 331 Hz.