Modern Physics Ques 264
- A $100$ $ V$ carrier wave is made to vary between $160 $ $V$ and $40 $ $V$ by a modulating signal. What is the modulation index?
(a) $0.4$
(b) $0.5$
(c) $0.6$
(d) $0.3$
(Main 2019, 12 Jan I)
Show Answer
Answer:
Correct Answer: 264.(c)
Solution:
Formula:
- Modulation index is given by
$ \begin{aligned} \mu & =\frac{A _{\max }-A _{\min }}{A _{\max }+A _{\min }}=\frac{V _{\text {max }}-V _{\text {min }}}{V _{\text {max }}+V _{\text {min }}} \\ & =\frac{160-40}{160+40}=\frac{120}{200}=0.6 \end{aligned} $
BETA
