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NEET UG PHYSICS MCQ: COMMUNICATION SYSTEMS

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Depth of modulation (ma)\left( {{m_a}} \right) in terms of Emax and Emin{{\text{E}}_{{\text{max}}}}\,{\text{and}}\,{{\text{E}}_{{\text{min}}}} is
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Correct option: C
ma = Emax - Emin/Emax+Emin{{\text{m}}_{\text{a}}}{\text{ = }}{{\text{E}}_{{\text{max}}}}{\text{ - }}{{\text{E}}_{{\text{min}}}}{\text{/}}{{\text{E}}_{{\text{max}}}} + {{\text{E}}_{{\text{min}}}}
Option C, ma = Emax - Emin/Emax+Emin{{\text{m}}_{\text{a}}}{\text{ = }}{{\text{E}}_{{\text{max}}}}{\text{ - }}{{\text{E}}_{{\text{min}}}}{\text{/}}{{\text{E}}_{{\text{max}}}} + {{\text{E}}_{{\text{min}}}}, is the correct formula for calculating the depth of modulation (mam_a) in terms of the maximum and minimum amplitudes of the modulated wave.

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In the communication systems, AM is used for broadcasting because The maximum and minimum voltage of an amplitude modulated signal are 60 V60 \mathrm{~V} and 20 V20 \mathrm{~V} respectively. The percentage modulation index will be: The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as The antenna current of an AM transmitter is 8 A when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by single sine wave. Find the percentage modulation. An audio signal of amplitude one half the carrier amplitude is used in amplitude modulation. Calculate the modulation index? When electromagnetic waves enter the ionised layer of ionosphere, then the relative permittivity ieie , dielectric constant dielectric constant of the ionised layer
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