JEE Main 2023 (Online) 8th April Morning Shift | Communication Systems Question 10 | Physics

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:

$$4868 \mathrm{~km}^{2}$$

$$1240 \mathrm{~km}^{2}$$

$$3942 \mathrm{~km}^{2}$$

$$1549 \mathrm{~km}^{2}$$

JEE Main 2023 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

For an amplitude modulated wave the minimum amplitude is $$3 \mathrm{~V}$$, while the modulation index is $$60 \%$$. The maximum amplitude of the modulated wave is:

5 V

12 V

10 V

15 V

JEE Main 2023 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by $$21 \%$$ ?

12%

15%

10%

14%

JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

In an amplitude modulation, a modulating signal having amplitude of X Volt is superimposed with a carrier signal of amplitude Y Volt in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude 2Y Volt. The ratio of modulation index in the two cases respectively will be :

2 : 1

1 : 1

4 : 1

1 : 2

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