Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main201912 Jan 2019Morning ShiftPhysicsCommunication SystemActual

A 100 V carrier wave is made to vary between 160 V and 40 V by a modulating signal. What is the modulation index?

Options

  1. A0.3
  2. B0.6
  3. C0.4
  4. D0.5

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 μ = A m A c = 0.6

Practice Communication System on Quantrex Academy →

More from Communication System

The height of transmitting antenna is 180 m and the height of the receiving antenna is 245 m . The maximum distance between them for satisfactory communication in line of sight wil 2023To radiate EM signal of wavelength λ with high efficiency, the antennas should have a minimum size equal to: 2023Match List-I with List-II List-I (Layer of atmosphere) List-II (Approximate height over earth's surface) ( A ) F 1 - Layer ( I ) 10 km B D - Layer II 170 - 190 km C Troposphere 2023The amplitude of 15 sin ( 1000 π t ) is modulated by 10 sin ( 4 π t ) signal. The amplitude modulated signal contains frequencies of A. 500 Hz B. 2 Hz C. 250 Hz D. 498 Hz 2023In satellite communication, the uplink frequency band used is: 2023A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the signal in line of sight at 4 km distance from it is x &# 2023A massage signal of frequency 3 kHz is used to modulate a carrier signal of frequency 1 . 5 MHz . The bandwidth of the amplitude modulated wave is 2023A carrier wave of amplitude 15 V is modulated by a sinusoidal base band signal of amplitude 3 V . The ratio of maximum amplitude to minimum amplitude in an amplitude modulated wave 2023 Full Communication System list All JEE Main PYQs