JEE Main On 16 April 2018 Question 29
Question: A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of 80% will be: [JEE Main 16-4-2018]
Options:
A) 11.2 V
B) 7 V
C) 22.4 V
D) 28 V
Show Answer
Answer:
Correct Answer: A
Solution:
Since Modulation Index $ =\frac{V _{m}}{V _{c}} $
$ V _{m}= $ Modulating Signal Voltage
$ V _{c}= $ Carrier Signal Voltage
$ 0.8=\frac{V _{m}}{14} $ $ V _{m}=11.2V $
