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1
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

In satellite communication, the uplink frequency band used is :

A
$$3.7-4.2 \mathrm{~GHz}$$
B
$$5.925-6.425 \mathrm{~GHz}$$
C
$$76-88 \mathrm{~MHz}$$
D
$$420-890 \mathrm{~MHz}$$
2
JEE Main 2023 (Online) 11th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the signal in line of sight at $$4 \mathrm{~km}$$ distance from it is $$x \times 10^{-2} \mathrm{~m}$$. The value of $$x$$ is __________.

(Let, radius of earth $$\mathrm{R}=6400 \mathrm{~km}$$ )

A
1.25
B
125
C
1250
D
12.5
3
JEE Main 2023 (Online) 10th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

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
$$3 ~\mathrm{kHz}$$
4
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

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
$$\frac{3}{2}$$
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