Question

The output current of an 80% mondulating amplitude modulated generator is 1.8A. To what value will the current rise if the generator is additionally modulated by another audiowave of modulation index 0.6?
A. 1.71A
B. 1.81A
C. 1.91A
D. 2.01A

Answer 1

Correct Answer - C
Here, `I_(t)=1.8A A: mu_(1)=(80)/(100)=0.80: mu_(2)=0.6`
`I_(t)=I_(c)sqrt(1+mu_(1)^(2)//2)`
`I_(c)=(1)/(sqrt(1+mu_(1)^(2)//2))=(1.8)/(sqrt(1+(0.8)^(2)//2))=(1.8)/(sqrt(1.32))`
`I_("net total")=I_(c)sqrt(1+(mu_(1)^(2))/(2)+(mu_(2)^(2))/(2))`
`=(1.8)/sqrt(1.32)sqrt(1+((0.8)^(2))/(2)+((0.6)^(2))/(2))=1.91A`