1
JEE Main 2023 (Online) 10th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

A message signal of frequency $$3 ~\mathrm{kHz}$$ is used to modulate a carrier signal of frequency $$1.5 ~\mathrm{MHz}$$. The bandwidth of the amplitude modulated wave is

A
$$6 ~\mathrm{MHz}$$
B
$$6 ~\mathrm{kHz}$$
C
$$3 ~\mathrm{MHz}$$
D
$$3 ~\mathrm{kHz}$$
2
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1

A carrier wave of amplitude 15 V is modulated by a sinusoidal base band signal of magnitude 3 V. The ratio of maximum amplitude to minimum amplitude in an amplitude modulated wave is

A
1
B
5
C
2
D
$$\frac{3}{2}$$
3
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1

The power radiated from a linear antenna of length $$l$$ is proportional to

(Given, $$\lambda=$$ Wavelength of wave):

A
$$\left(\frac{l}{\lambda}\right)^{2}$$
B
$$\frac{l}{\lambda^{2}}$$
C
$$\frac{l^{2}}{\lambda}$$
D
$$\frac{l}{\lambda}$$
4
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1

A TV transmitting antenna is $$98 \mathrm{~m}$$ high and the receiving antenna is at the ground level. If the radius of the earth is $$6400 \mathrm{~km}$$, the surface area covered by the transmitting antenna is approximately:

A
$$4868 \mathrm{~km}^{2}$$
B
$$1240 \mathrm{~km}^{2}$$
C
$$3942 \mathrm{~km}^{2}$$
D
$$1549 \mathrm{~km}^{2}$$
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