Question

In an amplitude modulation, a modulating signal having amplitude of $X V$ is superimposed with a carrier signal of amplitude $Y V$ in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude $2 YV$. The ratio of modulation index in the two cases respectively will be : s

• A. $2: 1$
• B. $1: 2$
• C. $1: 1$
• D. $4: 1$

Answer 1

Answer: (A)

Modulating Index
$\mu= \frac{A_m}{A_c} $
$\mu_1 =\frac{X}{Y}$
$\mu_2 =\frac{X}{2 Y}$
$\frac{\mu_1}{\mu_2} =\frac{2}{1}$