A carrier wave of peak voltage 24 V is used to transmit a message signal. What should be the peak Voltage of the modulating signal in order to have a modulation index of 70%?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \( 16.8\,\mathrm{V} \)
The modulation index of an amplitude modulated wave is the ratio of the peak voltage of the modulating signal to that of the carrier, \( \mu = V_m/V_c \).
\( V_m = \mu V_c = 0.70\times24\,\mathrm{V} = 16.8\,\mathrm{V} \)
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), and it also appears to be out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Exercises – …
