Question

The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V, respectively. The percentage modulation index will be:

• A. 0.5%
• B. 50%
• C. 2%
• D. 30%

Answer 1

Answer: (B)

50%

Answer 2

The percentage modulation index is:

$μ = \frac{V_{max}-V_{min}}{V_{max}+V_{min}} \times 100$

= $\frac{60-20}{60+20} \times 100$

= $50 \%$

Hence, the correct option is (B): $50\%$