Question

A message signal of frequency $10 KHz$ and peak voltage of $15$ volts is used to modulate a carrier frequency of $ 1 \.M\.Hz$ and peak voltage of 30 volts. Determine the modulation index.

• A. $0.5$
• B. $0.6$
• C. $0.7$
• D. $0.8$

Answer 1

Answer: (A)

Modulation index,
$\mu=\frac{\text { Amplitude of message signal }}{\text { Amplitude of carrier wave }}=\frac{15 V }{30 V }=0.5$