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Receiver Selectivity and Sensitivity Quiz

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Receiver Selectivity and Sensitivity Quiz

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Questions and Answers

What is the relationship between the center frequency ($f_c$) and the bandwidth (Bandwidth) of a tuned circuit, according to the text?

$Q = Bandwidth / f_c$

$Q = Bandwidth * f_c$

$Q = f_c * Bandwidth$

$Q = f_c / Bandwidth$ (correct)

What is the value of Q required for a tuned circuit with a center frequency of 455 kHz and a bandwidth of 10 kHz?

4550

45.5 (correct)

4.55

455

Why is the selectivity of a TRF (Tuned Radio Frequency) receiver poor, according to the text?

The Q factor requirement of the tuned circuits is not fixed.

The Q factor requirement varies with carrier frequency.

It is impossible to achieve high Q values with ordinary tuned circuits.

All of the above (correct)

What is the Q required for a tuned circuit with a center frequency of 550 kHz and a bandwidth of 10 kHz?

55 Signup and view all the answers

What is the Q required for a tuned circuit with a center frequency of 1650 kHz and a bandwidth of 10 kHz?

165 Signup and view all the answers

What is the Q required for a tuned circuit with a center frequency of 20 MHz and a bandwidth of 10 kHz?

2000 Signup and view all the answers

Why is the high Q requirement for tuned circuits in TRF receivers difficult to achieve in practice?

All of the above Signup and view all the answers

How does the selectivity of a TRF receiver compare to that of a better designed receiver, according to the text?

The selectivity of a TRF receiver is worse. Signup and view all the answers

What is the main reason why the selectivity of a TRF receiver is poor, according to the text?

All of the above Signup and view all the answers

What is the purpose of using a tuned circuit in a receiver, according to the text?

To improve the selectivity of the receiver. Signup and view all the answers