Question

A carrier wave of peak voltage 16 V is used to transmit a signal. If the modulation index is 75%, the peak voltage of the modulating signal is ______.

Options

• 18 V

• 12 V

• 6 V

• 24 V

Answer 1

A carrier wave of peak voltage 16 V is used to transmit a signal. If the modulation index is 75%, the peak voltage of the modulating signal is 12 V.

Explanation:

Modulation Index

(MI) = `("Peak voltage of modulating signal"  ("V"_"m"))/("Peak voltage of carrier signal" ("V"_"c"))`

Given, Ml = 75% and V_c = 16V

`therefore "V"_"m" = "MI" xx "V"_"c" = 75/100 xx 16` = 12 V