Home
Class 12
PHYSICS
A 100 V carrier wave is mode to vary be...

A 100 V carrier wave is mode to vary betqeen 160 and 40 V by a modulating signal . What is the modulation index ?

A

`0.4`

B

`0.6`

C

`0.5`

D

`0.3`

Text Solution

Verified by Experts

The correct Answer is:
B
`A_(c) = 100`
`A_(c) + A_(m) = 160`
`A_(c) - A_(m) = 40`
`A_(c) = 100 , A_(m) = 60`
`mu = (A_(m))/( A_(c)) = 0.6`
Promotional Banner

Similar Questions

Explore conceptually related problems

What is modulation index of an FM wave ?

A message signal of 1 KHz and peak voltage 50 v is used to modulate a carrier wave of frequency 1200 KHz and peak voltage 80 V. What is the modulation index ?

For an amplitude modulated wave, the maximum amplitude is found to be 10 V, while the minimum amplitude is 2 V. What is the modulation index ?

A carrier wave is modulated by a number of sine waves with modulation indices 0.1 , 0.2 , 0.3 . The total modulation index ( m ) of the waves is

A modulating signal is a square wave as shown in the following figure. While the carrier wave is given by, e = 4 sin (87 pi t) volt. What is the modulation index ?

A message signal of 12 kHz and peak voltage 20 V is used to modulate a carrier wave of frequency 12 MHz and peak voltage 30 V. Calculate the (i) modulation index (ii) side- band frequencies.

An audio signal of amplitude one half the carrier amplitude is employed in amplitude modulation. What is the modulation index?

A 100 MHz xarrier wave frequency is modulated by 10 kHz sinusoidal modulating signal. If the maximum frequency deviation is 50 kHz, find the modulation index.

(a) If A and B represent the maximum amplitudes of an amplitude modulated wave, wrigte the expression for the modulation index in terms of A and B. (b) A message signal of frequency 20 kHz and peak voltage 10 V is used to modulate a carrier of frequency 2 MHz and peak voltage of 15 V. Calculate the modulation index. Why the modulation index is generally less than one ?

A carrier wave of peak voltage 10 V is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of 80% is