Question

The modulation index of an FM carrier having a carrier swing of 200 kHz and a modulating signal 10 kHz is

• A. 5
• B. 10
• C. 20
• D. 25

Answer 1

The correct option is B 10

CS = 2 $\times △f$ or $△f=\frac{CS}{2}$
$\therefore △f=\frac{200}{2}$ = 100kHz
Now $m_f$ = $\frac{△f}{f_m}=\frac{100}{10}=10$