This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
Out of Syllabus
The amplitude of upper and lower side bands of A.M. wave where a carrier signal with frequency 11.21 MHz, peak voltage 15 V is amplitude modulated by a 7.7 kHz sine wave of 5V amplitude are $${a \over {10}}V$$ and $${b \over {10}}V$$ respectively. Then the value of $${a \over b}$$ is ____________.
2
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
Out of Syllabus
A message signal of frequency 20 kHz and peak voltage of 20 volt is used to modulate a carrier wave of frequency 1 MHz and peak voltage of 20 volt. The modulation index will be :
3
JEE Main 2021 (Online) 20th July Morning Shift
Numerical
+4
-1
Out of Syllabus
A carrier wave Vc(t) = 160 sin(2$$\pi$$ $$\times$$ 106t) volts is made to vary between Vmax = 200 V and Vmin = 120 V by a message
signal Vm(t) = Am sin(2$$\pi$$ $$\times$$ 103t) volts. The peak voltage Am of the modulating signal is ___________.
4
JEE Main 2021 (Online) 18th March Evening Shift
Numerical
+4
-1
Out of Syllabus
A TV transmission tower antenna is at a height of 20 m. Suppose that the receiving antenna is at.

(i) ground level

(ii) a height of 5 m.

The increase in antenna range in case (ii) relative to case (i) is n%.

The value of n, to the nearest integer, is ___________.