Question

Which of the following is false with respect to Pulse modulation?

(a) Depends only on the frequency of the modulating signal

(b) Phase of the carrier wave changes with respect to the modulating signal

(c) Less affected by noise

(d) Used to digitally transmit analog data

Answer 1

Correct answer is (a) Depends only on the frequency of the modulating signal

The best I can explain: Phase modulation depends on both the amplitude and frequency of the modulating signal. Higher amplitude causes a greater phase shift and higher frequency causes a greater rate of change of phase in the carrier signal.