Q JEE MAIN 2020

An amplitude modulated wave is represented by the expression $\mathrm{v}_{\mathrm{m}}=5(1+0.6 \cos 6280 \mathrm{t}) \sin (211 \times 10^4 \mathrm{t}$ ) volts...

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Q JEE-MAIN 2019

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

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Q JEE MAIN_2019

Given below in the left column are different modes of communication using the kinds of waves given in the right...

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Q JEE MAIN_2019_

A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a...

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Q JEE MAIN 2019

In an amplitude modulator circuit, the carrier wave is given by, $C(t)=4 \sin (20000 \pi t)$ while modulating signal is...

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Q JEE MAIN 2019

To double the covering range of a TV transmission tower, its height should be multiplied by:

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Q JEE MAIN 2019

An amplitude modulated signal is given by $V(t)=10\left[1+0.3 \cos \left(2.2 \times 10^4 t\right)\right] \sin \left(5.5 \times 10^5 t\right)$. Here $t$...

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Q JEE-MAIN 2020

The correct match between the entries in column I and column II are

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Q JEE Main 2019

A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m...

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Q JEE MAIN 2019

An amplitude modulated signal is plotted below: Which one of the following best describes the above signal?

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Q JEE MAIN 2021

If the sum of the heights of transmitting and receiving antennas in the line of sight of communication is fixed...

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Q JEE MAIN 2021

A bandwidth of 6 MHz is available for A.M. transmission. If the maximum audio signal frequency used for modulating the...

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Q JEE-MAIN 2021

An antenna is mounted on a 400 m tall building. What will be the wavelength of signal of signal that...

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Q JEE MAIN 2021

An amplitude modulated wave is represented by $$ C_m(t)=10(1+0.2 \cos 12560 t) \sin \left(111 \times 10^4 t\right) \text { volts....

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Q JEE MAIN 2019

The wavelength of the carrier waves in a modern optical fiber communication network is close to :

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Q JEE-MAIN 2021

A transmitting antenna at top of a tower has a height of 50 m and the height of receiving antenna...

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Q JEE MAIN 2021

The maximum amplitude for an amplitude modulated wave is found to be 12V while the minimum amplitude is found to...

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Q JEE-MAIN 2021

A carrier wave with amplitude of 250 V is amplitude modulated by a sinusoidal base band signal of amplitude 150...

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Q JEE MAIN 2021

A message signal of frequency 20 kHz and peak voltage of 20 volt is used to modulate a carrier wave...

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Q JEE-MAIN 2021

In amplitude modulation, the message signal $...

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Q JEE MAIN 2021

A carrier wave $V_c(t)=160 \sin \left(2 \pi \times 10^6 t\right)$ volts is made to vary between $V_{\max }=200 \mathrm{~V}$ and...

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Q JEE MAIN 2021

The amplitude of upper and lower side bands of A.M. wave where a carrier signal with frequency 11.21 MHz ,...

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Q JEE MAIN 2021

What should be the height of transmitting antenna and the population covered if the television telecast is to cover a...

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Q JEE MAIN 2021

Consider a situation in which reverse biased current of a particular P-N junction increases when it is exposed to a...

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Q JEE MAIN 2019

In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving...

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Q JEE MAIN 2022

A square wave of the modulating signal is shown in the figure. The carrier wave is given by C(t) =...

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Q JEE MAIN 2021

A TV transmission tower antenna is at a height of 20 m. Suppose that the receiving antenna is at. (i)...

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Q JEE MAIN 2021

A carrier signal $C(t)=25 \sin \left(2.512 \times 10^{10} t\right)$ is amplitude modulated by a message signal $...

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Q JEE MAIN 2021

Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should...

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Q JEE_MAIN_2021

For VHF signal broadcasting, $\_\_\_\_$ $\mathrm{km}^2$ of maximum service area will be covered by an antenna tower of height 30...

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Q JEE MAIN 2021

The maximum and minimum amplitude of an amplitude modulated wave is 16 V and 8 V respectively. The modulation index...

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Q JEE MAIN 2021

A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m....

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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...

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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...

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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...

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Q JEE MAIN 2022

Amplitude modulated wave is represented by $V_{R M}=10\left[1+0.4 \cos \left(2 \pi \times 10^4 t\right)\right] \cos \left(2 \pi \times 10^7 t\right)$....

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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...

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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...

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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...

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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...

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Q JEE MAIN 2022

Match List – I with List –II Choose the correct answer from the options given below :

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Q JEE MAIN 2022

The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation...

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Q JEE MAIN 2022

A radio can tune to any station in 6 MHz to 10 MHz band. the value of corresponding wavelength bandwidth...

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Q JEE MAIN 2022

We do not transmit low frequency signal to long distances because (a) The size of the antenna should be comparable...

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Q JEE MAIN 2022

The TV transmission tower at a particular station has a height of 125 m. For dubling the coverage of its...

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Q JEE MAIN 2022

An antenna is placed in a dielectric medium of dielectric constant 6.25. If the maximum size of that antenna is...

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Q JEE-MAIN 2022

Only $2 \%$ of the optical source frequency is the available channel bandwidth for an optical communicating system operating at...

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Q JEE MAIN 2022

Match List-I with List-II Choose the correct answer from the options given below :

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Q JEE MAIN 2022

Choose the correct statement for amplitude modulation:

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Q JEE MAIN 2022

A baseband signal of 3.5 MHz frequency is modulated with a carrier signal of 3.5 GHz frequency using amplitude modulation...

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Q JEE MAIN 2022

A radar sends an electromagnetic signal of electric field $\left(\mathrm{E}_0\right)=2.25 \mathrm{~V} / \mathrm{m}$ and magnetic field $\left(\mathrm{B}_0\right)=1.5 \times 10^{-8} \mathrm{~T}$...

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Q JEE MAIN 2023

Match List-I with List-II Choose the correct answer from the options given below :-

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Q JEE MAIN 2023

For an amplitude modulated wave the minimum amplitude is 3V, while the modulation index is 60%. The maximum amplitude of...

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Q JEE MAIN 2023

To radiate EM signal of wavelength $\lambda$ with high efficiency, the antennas should have a minimum size equal to :

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Q JEE MAIN 2023

The power radiated from a linear antenna of length $(\ell)$ is proportional to (Given, $\lambda=$ Wavelength of wave):

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Q JEE MAIN_2023

Match List I with List II Choose the correct answer from the options given below :

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Q JEE MAIN 2023

Match List I with List II: Choose the correct answer from the options given below :

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Q JEE MAIN 2023

A modulating signal is a square wave, as shown in the figure. If the carrier wave is given as $...

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Q JEE MAIN 2023

Given below are two statements Statement I: For transmitting a signal, size of antenna (l) should be comparable to wavelength...

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Q JEE MAIN 2023

Two bodies are having kinetic energies in the ratio 16 : 9. If they have same linear momentum, the ratio...

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Q JEE MAIN 2023

Match List – I with List – II Choose the correct answer from the options given below:

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Q JEE MAIN 2023

Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R....

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Q JEE MAIN 2023

Match List I with List II of electromagnetic waves with corresponding wavelength range:Choose the correct answer from the options given...

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Q JEE MAIN 2023

The amplitude of $15 \sin (1000 \pi \mathrm{t})$ is modulated by $10 \sin (4 \pi \mathrm{t})$ signal. The amplitude modulated...

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Q JEE MAIN 2023

A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive...

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Q JEE MAIN 2023

The height of transmitting antenna is 180 m and the height of the receiving antenna is 245 m. The maximum...

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Q JEE MAIN 2023

By what percentage will the transmission range of a TV tower be affected when the height of the tower is...

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Q JEE MAIN 2023

If the height of transmitting and receiving antennas are 80 m each, the maximum line of sight distance will be...

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