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Electronics and Communication Engineering - Radio Receivers

Exercise : Radio Receivers - Section 1
46.
In superheterodyne receivers, the local oscillator is used to
detect the modulating signal
amplify the received modulated carrier
shift the frequency of the received modulated carrier to the IF band
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
Which of the following is same in AM and FM receivers?
Demodulator
AGC
IF amplifier
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
A notch filter is sometimes used in communication receivers to
reduce receiver gain at some specific frequency
increase receiver gain at some specific frequency
made selectivity more precise
spread the bandwidth
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
Which one of the following is not a useful quantity for comparing the noise performance of receivers?
Noise figure
Noise temperature
Input noise voltage
Equivalent noise resistance
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
Which of the following statement about the amplitude limiter is not valid?
Leak type bias must be used
Output must be tuned
The circuit is always biased in class C, by virtue of the leak type bias
When the input increases past the threshold of limiting, the gain decreases to keep the output constant
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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