This chapter is currently out of syllabus
1
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
2
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
3
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
Out of Syllabus
The physical sizes of the transmitter and receiver antenna in a communication system are :-
A
proportional to carrier frequency
B
inversely proportional to carrier frequency
C
inversely proportional to modulation frequency
D
independent of both carrier and modulation frequency
4
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
Out of Syllabus
A signal Acoswt is transmitted using v0 sin $$\omega$$0t as carrier wave. The correct amplitude modulated (AM) signal is
A
v0 sin $$\omega$$0t + Acos$$\omega$$t
B
(v0 + A)cos$$\omega$$t sin$$\omega$$0 t
C
v0 sin[$$\omega$$0 (1+ 0.01Asin$$\omega$$t)t]
D
$${v_0}\sin {\omega _0}t + {{\rm A} \over 2}\sin ({\omega _0} - \omega )t + {A \over 2}\sin ({\omega _0} + \omega )t$$
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