Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

JEE Main 201912 JanuaryMorning Shift

Exam: JEE Main
Year: 2019
Date: 12 January
Shift: Morning Shift
Subject: Physics
Chapter: Communication System

JEE Main 2019 · 12 January · Morning Shift · Physics · Communication System

A 100V carrier wave is made to vary between 160V and 40V by a...

A

100V

carrier wave is made to vary between

160V

and

40V

by a modulating signal. What is the modulation index?

Options

A $0.3$
B $0.6$
C $0.4$
D $0.5$

Correct answer

B. $0.6$

Step-by-step solution

{A}_{C} = 100

{A}_{C} + {A}_{m} = 160

{A}_{C} - {A}_{m} = 40

{A}_{C} = 100, {A}_{m} = 60

\mu = \dfrac{{A}_{m}}{{A}_{c}} = 0.6

Practice Communication System on Quantrex Academy →

More from Communication System

The height of transmitting antenna is 180m and the height of the receiving antenna is… JEE Main 2023 To radiate EM signal of wavelength λ with high efficiency, the antennas should have a… JEE Main 2023 Match List-I with List-II List-I (Layer of atmosphere) List-II (Approximate height over… JEE Main 2023 The amplitude of 15 ( 1000 ) is modulated by 10 ( 4 ) signal. The amplitude modulated… JEE Main 2023 In satellite communication, the uplink frequency band used is: JEE Main 2023 A transmitting antenna is kept on the surface of the earth. The minimum height of… JEE Main 2023 A massage signal of frequency 3kHz is used to modulate a carrier signal of frequency 1 .… JEE Main 2023 A carrier wave of amplitude 15V is modulated by a sinusoidal base band signal of… JEE Main 2023 Full Communication System list All JEE Main PYQs