Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication ?

Question

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication ? (A) R =20 Ω, L =1.5 H , C =35 μ F (B) R = 25 Ω, L = 2.5 H , C = 45 μ F (C) R = 15 Ω, L = 3.5 H , C = 30 μ F (D) R = 25 Ω, L = 1.5 H , C = 45 μ F

Tardigrade Admin · Accepted Answer

For better tuning quality factor should be high Q = (1/R) √(L/C) for Qmax, R should be least ∴ Best answer is R = 15 Ω, L = 3.5 H, C = 30 μ F

Q. Which of the following combinations should be selected for better tuning of an $L - C - R$ circuit used for communication ?

$R = 20 Ω, L = 1.5 H, C = 35 μ F$

$R = 25Ω, L = 2.5 H, C = 45 μ F$

$R = 15Ω, L = 3.5 H, C = 30 μ F$

$R = 25Ω, L = 1.5 H, C = 45 μ F$

For better tuning quality factor should be high
$Q = \frac{1}{R} \frac{L}{C}$
for $Q_{ma x}$ , R should be least
$∴$ Best answer is
$R = 15 Ω, L = 3.5 H, C = 30 μ F$

Q. Which of the following combinations should be selected for better tuning of an L−C−R circuit used for communication ?

R=20Ω,L=1.5H,C=35μF

R=25Ω,L=2.5H,C=45μF

R=15Ω,L=3.5H,C=30μF

R=25Ω,L=1.5H,C=45μF