This chapter is currently out of syllabus
1
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
Out of Syllabus
An amplitude modulated wave is represented by the expression
vm = 5(1 + 0.6 cos 6280t) sin(211 × 104 t) volts
The minimum and maximum amplitudes of the amplitude modulated wave are, respectively
A
$${3 \over 2}$$ V, 5 V
B
$${5 \over 2}$$ V, 8 V
C
5 V, 8 V
D
3 V, 5 V
2
JEE Main 2019 (Online) 12th April Evening Slot
+4
-1
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 :
A
0.3 and 9 kHz
B
0.5 and 10 kHz
C
0.4 and 10 kHz
D
0.5 and 9 kHz
3
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
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 :
A
0.25; 1 × 108 Hz
B
4; 2 × 108 Hz
C
4; 1 × 108 Hz
D
0.25; 2 × 108 Hz
4
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
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
C Sonar R Microwaves
D Mobile Phones S Radio Waves
A
A-Q, B-S, C-R, D-P
B
A-Q, B-S, C-P, D-R
C
A-S, B-Q, C-R, D-P
D
A-R, B-P, C-S, D-Q
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