SELECT * FROM question_mgmt as q WHERE id=2813 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=8 AND chapterId=129 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

A carrier wave of peak voltage 12 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 75%?

Answer:

Amplitude of the carrier wave, A c = 12 V

Modulation index, m = 75% = 0.75

Amplitude of the modulating wave = A m

Using the relation for modulation index: m = Am/Ac

Therefore, Am = m Ac

= 0.75 x 12 = 9V


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