JEE Main 2021 (Online) 17th March Evening Shift | Communication Systems Question 63 | Physics

A carrier signal C(t) = 25 sin(2.512 $$\times$$ 10¹⁰t) is amplitude modulated by a message signal m(t) = 5 sin(1.57 $$\times$$ 10⁸t) and transmitted through an antenna. What will be the bandwidth of the modulated signal?

50 MHz

8 GHz

1987.5 MHz

2.01 GHz

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)

158.2 m

79.1 m

19.77 m

39.55 m

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of the signal transmitted by this antenna would be :

200

400

100

300

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

If a message signal of frequency 'f_m' is amplitude modulated with a carrier signal of frequency 'f_c' and radiated through an antenna, the wavelength of the corresponding signal in air is :

$${c \over {{f_c} + {f_m}}}$$

$${c \over {{f_c}}}$$

$${c \over {{f_c} - {f_m}}}$$

$${c \over {{f_m}}}$$

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