JEE Main 2019 (Online) 10th January Morning Slot | Communication Systems Question 86 | Physics

A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower is LOS (Line of Sight) mode ? (Given : radius of earth = 6.4 × 10⁶ m).

40 km

65 km

48 km

80 km

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwith. The number of channels accomodated for transmitting TV signals of band width 6 MHz are (Take velocity of light c = 3 $$ \times $$ 10⁸m/s, h = 6.6 $$ \times $$ 10^$$-$$34 J-s)

3.75 $$ \times $$ 10⁶

3.86 $$ \times $$ 10⁶

6.25 $$ \times $$ 10⁵

4.87 $$ \times $$ 10⁵

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of 80% will be :

7 V

28 V

11.2 V

22.4 V

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

-1

Out of Syllabus

A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz ?

2 $$\times$$ 10⁶

2 $$\times$$ 10³

2 $$\times$$ 10⁵

2 $$\times$$ 10⁴

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