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Question

Which of the following combination should be selected for better tuning of an LCR circuit used for communication?

A
R=25 Ω,L=15 H,C=45 μF
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B
R=25 Ω, L=1.5 H, C=35 μF
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C
R=25 Ω, L=2.5 H, C=45 μF
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D
R=15 Ω, L=3.5 H, C=30 μF
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Solution

The correct option is D R=15 Ω, L=3.5 H, C=30 μF

For tuning a LCR circuit, its selectivity should be high. High selectivity is observed in circuits with high quality factor.
Q=LRC
For option (a), Q=7.3
For option (b), Q=8.28
For option (c), Q=9.43
For option (d), Q=22.77

Hence, option (d) gives the best combination.


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