Question

Mixing is used in communication to ________

(a) raise the carrier frequency

(b) lower the carrier frequency

(c) to altered the deviation

(d) to change the carrier frequency to any required value

This question was posed to me in examination.

I'd like to ask this question from Types of Frequency Modulation in division Angle Modulation of Analog Communications

Answer 1

Correct answer is (d) to change the carrier frequency to any required value

To explain: Mixing is used to change the frequency of carrier by mixing it with a radio frequency signal or audio signal. The frequency can be changed to any required value in communication.