JEE Main 2020 (Online) 2nd September Morning Slot | Communication Systems Question 73 | Physics

An amplitude modulated wave is represented by the expression
v_m = 5(1 + 0.6 cos 6280t) sin(211 × 10⁴ t) volts
The minimum and maximum amplitudes of the amplitude modulated wave are, respectively

$${3 \over 2}$$ V, 5 V

$${5 \over 2}$$ V, 8 V

5 V, 8 V

3 V, 5 V

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MCQ (Single Correct Answer)

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Out of Syllabus

In an amplitude modulator circuit, the carrier wave is given by, C(t) = 4 sin(20000 $$\pi $$t) while modulating signal is given by, m(t) = 2 sin (2000 $$\pi $$t). The values of modulation index and lower side band frequency are :

0.3 and 9 kHz

0.5 and 10 kHz

0.4 and 10 kHz

0.5 and 9 kHz

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MCQ (Single Correct Answer)

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Out of Syllabus

Given below in the the left column are different modes of communication using the kinds of waves given the right column.

A	Optical Fibre communication	P	Ultrasound
B	Radar	Q	Infrared Light
C	Sonar	R	Microwaves
D	Mobile Phones	S	Radio Waves

A-Q, B-S, C-R, D-P

A-Q, B-S, C-P, D-R

A-S, B-Q, C-R, D-P

A-R, B-P, C-S, D-Q

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MCQ (Single Correct Answer)

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Out of Syllabus

A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 V. The modulation index and difference between the two side band frequencies are :

0.25; 1 × 10⁸ Hz

4; 2 × 10⁸ Hz

4; 1 × 10⁸ Hz

0.25; 2 × 10⁸ Hz

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