Question

For an amplitude modulated wave the minimum amplitude is 3V, while the modulation index is 60%. The maximum amplitude of the modulated wave is

• A. 5 V
• B. 10 V
• C. 12 V
• D. 15 V

Answer 1

The Correct Option is C

Given, modulation index $m = 60\% = 0.6$ and minimum amplitude $A_c = 3 \, V$.
Using the formula for amplitude modulation: $$A_m = mA_c$$ The maximum amplitude of the modulated wave is: $$A_m + A_c = 0.6 \times 1 + 3 = 1.6 \, \text{V}$$ Now applying the amplitude formula: $$A_m + A_c = \frac{1.6}{-0.4} = 12 \, \text{V}$$