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Communication Systems

Get chapter-wise JEE Main & Advanced questions with solutions

Q JEE MAIN 2021
A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of...
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Q JEE MAIN 2021
If the highest frequency modulating a carrier is 5 kHz , then the number of AM broadcast stations accommodated in a 90 kHz bandwidth are
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Q JEE MAIN 2021
An audio signal $v_m=20 \sin 2 \pi(1500 \mathrm{t})$ amplitude modulates a carrier $v_c=80 \sin 2 \pi(100,000 \mathrm{t})$. The value of percent modulation is $\_\_\_\_$ .
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Q JEE MAIN 2021
Given below are two statement :
Statement-I: A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The...
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Q JEE MAIN 2022
Amplitude modulated wave is represented by $V_{R M}=10\left[1+0.4 \cos \left(2 \pi \times 10^4 t\right)\right] \cos \left(2 \pi \times 10^7 t\right)$. The total bandwidth of the...
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Q JEE MAIN 2022
A modulating signal 2sin $\left(6.28 \times 10^6\right) \mathrm{t}$ is added to the carrier signal 4sin $\left(12.56 \times 10^9\right)$ t for amplitude modulation. The combined signal...
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Q JEE MAIN 2022
A FM Broad cast transmitter, using modulating signal of frequency 20 kHz has a deviation ratio of 10. The Bandwidth required for transmission is :
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Q JEE Main 2022_
In the case of amplitude modulation to avoid distortion the modulation index $(\mu)$ should be ${ }_{\text {in }}$
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Q JEE MAIN 2022
Find the modulation index of an AM wave having 8V variation where maximum amplitude of the AM wave is 9 V.
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Q JEE MAIN 2022
The required height of a TV tower which can cover the population of 6.03 lakh is h. If the average population density is 100 per...
JEE Main Physics Medium
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