Question

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

• A. R = 20 $\Omega$, L = 1.5 H, C = 35 $\mu F$
• B. R = 25 $\Omega$, L = 2.5 H, C = 40 $\mu F$
• C. R = 15 $\Omega$, L = 3.5 H, C = 30 $\mu F$
• D. R = 25 $\Omega$, L = 1.5 H, C = 45 $\mu F$

Answer 1

The correct option is C R = 15 $\Omega$, L = 3.5 H, C = 30 $\mu F$

For better tuning $Q$ should be high

$Q=\frac{1}{R}\sqrt{\frac{L}{C}}$

For $Q$ to be high, $L$ should be high and $C$ should be low.

so c is the correct answer