This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
2
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
3
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
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
4
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
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