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JEE Main 202228 JulyEvening Shift

Exam: JEE Main
Year: 2022
Date: 28 July
Shift: Evening Shift
Subject: Physics
Chapter: Communication System

JEE Main 2022 · 28 July · Evening Shift · Physics · Communication System

A FM Broad cast transmitter, using modulating signal of frequency...

A FM Broad cast transmitter, using modulating signal of frequency

20kHz

has a deviation ratio of

10

. The Bandwidth required for transmission is :

Options

A $220kHz$
B $180kHz$
C $360kHz$
D $440kHz$

Correct answer

D. $440kHz$

Step-by-step solution

Given
FM broadcast
Modulating frequency $= 20kHz = f$
Deviation ratio $= \dfrac{frequencydeviation}{modulatingfrequency} = \dfrac{∆ f}{f}$
$⇒$ Frequency deviation, $\Deltaf = f \times 10$
$= 20kHz \times 10 = 200kHz$
$⇒$ Bandwidth $= 2\left(f + \Deltaf\right)$
$= 2\left(20 + 200\right)kHz$
$= 440kHz$

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