Question

A sinusoidal voltage amplitude modulates another sinusoidal voltage of amplitude 2 kV to result in two sidebands, each of amplitude 200 V. The modulation index is

• A. 0.2
• B. 0.3
• C. 0.4
• D. 0.5

Answer 1

Answer: (A)

0.2

Answer 2

: Amplitude of each side band = $\frac{\mu A_{c}}{2}$

$\therefore 200V = \frac{\mu \times 2kV}{2} = \frac{\mu \times 2000V}{2}$

Or $\mu = \frac{2 \times 200}{2000} = 0.2$