Exercise: Radio Receivers

Questions for: Radio Receivers

Which one of the following is not a useful quantity for comparing the noise performance of receivers?
A:
Noise figure
B:
Noise temperature
C:
Input noise voltage
D:
Equivalent noise resistance
Answer: C
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A notch filter is sometimes used in communication receivers to
A:
reduce receiver gain at some specific frequency
B:
increase receiver gain at some specific frequency
C:
made selectivity more precise
D:
spread the bandwidth
Answer: A
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Which of the following is same in AM and FM receivers?
A:
Demodulator
B:
AGC
C:
IF amplifier
D:
All of the above
Answer: C
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In superheterodyne receivers, the local oscillator is used to
A:
detect the modulating signal
B:
amplify the received modulated carrier
C:
shift the frequency of the received modulated carrier to the IF band
D:
Answer: C
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Modulated carrier power in FM
A:
increases with modulating signal power
B:
decreases with modulating signal power
C:
is independent of the modulating signal power
D:
none
Answer: C
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