NEET UG PHYSICS MCQ: COMMUNICATION SYSTEMS

1 Hard

1 of 1

Application +4 | -1

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.

View answer and explanation

Correct option: B

0.701

Option B (0.701) is correct because it represents the modulation index calculated from the antenna currents with and without modulation.

More Questions from COMMUNICATION SYSTEMS

Practice All Chapter MCQs →

In the communication systems, AM is used for broadcasting because The maximum and minimum voltage of an amplitude modulated signal are

60 \mathrm{~V}

and

20 \mathrm{~V}

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

\left( {{m_a}} \right)

in terms of

{{\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 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

ie

, dielectric constant dielectric constant of the ionised layer