Which of the following combinations should be selected for better tuning of an LCR circuit used for communication? (a) R = 20 Ω, L = 1.5 H, C = 35µF. (b) R = 25 Ω, L = 2.5 H, C = 45µF. (c) R = 15 Ω, L = 3.5 H, C = 30µF. (d) R = 25 Ω, L = 1.5 H, C = 45µF
Correct option is D) For tuning an LCR circuit, its selectivity should be high. High selectivity is observed in circuits with high-quality factor. Q=RCL Puting value in above equation: For option (a), Q=7.3 For option (b), Q=8.28 For option (c), Q=9.43 For option (d), Q=13.67 As Q=1530×10−63.5=13.67
