Question

A carrier wave of peak voltage 12 V is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of 75% is

• A. 6 V
• B. 7 V
• C. 8 V
• D. 9 V

Answer 1

Answer: (D)

9 V

Answer 2

: Here $A_{c} = 12V,\mu = 75\% = 0.75$

As $\mu = \frac{A_{m}}{A_{c}}orA_{m} = \mu \times A_{c} = 9V$