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Calculate modulation index if carrier wa...

Calculate modulation index if carrier waves is modulated by three signals with modulation indices as `0.6`, `0.3` and `0.4`

A

`1.0`

B

`0.70`

C

`0.78`

D

`1.3`

Text Solution

Verified by Experts

The correct Answer is:
C
`m_(t)=sqrt(m_(1)^(2)+m_(2)^(2)+m_(3)^(2))=0.78`
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Knowledge Check

  • What is the modulation index of an over modulated wave

    A
    1
    B
    zero
    C
    `lt1`
    D
    `gt1`

  • What is total modulation index when a carrier wave is modulated by a number of sine waves having modulation index mu_1, mu_2, mu_3, …….mu_n ?

    A
    `mu_(A)=mu_(1)+mu_(2)+mu_(3)+.....+mu_(n)`
    B
    `mu_(A)=(mu_(1)+mu_(2)+mu_(3)+.....+mu_(n))//n`
    C
    `mu_(A)=sqrt(mu_(1)^(2)+mu_(2)^(2)+mu_(3)^(2).....+mu_(n)^(2))`
    D
    `mu_(A)=(mu_(1)^(2)+mu_(2)^(2)+mu_(3)^(2)+....mu_(n)^(2))^(2)`

  • To avoid distortion in the signal, modulation index should be

    A
    less than 1
    B
    greater than 1
    C
    equal to 1
    D
    less than or equal to 1

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