Question

What will be the effect on power in amplitude modulated system if we increase the modulation index?

(a) increases

(b) becomes twice

(c) remains same

(d) decreases

This question was addressed to me in an internship interview.

Asked question is from Switching Circuit topic in chapter Side Band Techniques of Analog Communications

Answer 1

Correct option is (a) increases

The best explanation: If we increase or decrease the modulation index, accordingly the power of amplitude modulated system will also increase or decrease. This is because the power is directly proportional to the modulation index.