Question

The image frequency of a superheterodyne receiver ___________

(a) is created within the receiver itself

(b) is due to insufficient adjacent channel rejection

(c) is not rejected by the IF tuned circuits

(d) is independent of the frequency to which the receiver is tuned

I got this question during an interview.

This interesting question is from Noise for AM Wave in chapter Noise of Analog Communications

Answer 1

Correct option is (c) is not rejected by the IF tuned circuits

Explanation: To eliminate the image frequency of a superheterodyne receiver, adequate attenuation on the incoming signal by the RF amplifier filter is needed. It is not rejected by the IF tuned circuits and thus, it produces image frequency.