Question

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

Options

• 0.5%

• 50%

• 2%

• 30%

Answer 1

The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation index will be 50%.

Explanation:

Given that V_max = 60, V_min = 20

% modulation is given by

`(("V"_"max"-"V"_"min")/("V"_"max"+"V"_"min"))100`

⇒ `((60-20)/(60+20))100`

⇒ `(40/80)100`

⇒ 50%