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NEET UG PHYSICS MCQ: COMMUNICATION SYSTEMS

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In earth's atmosphere, for E-layer, the virtual height and critical frequency are

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Correct option: D

110 km and 4 MHz

Option D, 110 km and 4 MHz, is the closest to the typical values for the E-layer virtual height and critical frequency in Earth's atmosphere.

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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 \mathrm{~V}

20 \mathrm{~V}

respectively. The percentage modulation index will be: Depth of modulation

\left( {{m_a}} \right)

{{\text{E}}_{{\text{max}}}}\,{\text{and}}\,{{\text{E}}_{{\text{min}}}}

is 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?