This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
Out of Syllabus
A 25 m long antenna is mounted on an antenna tower. The height of the antenna tower is 75 m. The wavelength (in meter) of the signal transmitted by this antenna would be :
A
200
B
400
C
100
D
300
2
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
Out of Syllabus
If a message signal of frequency 'fm' is amplitude modulated with a carrier signal of frequency 'fc' and radiated through an antenna, the wavelength of the corresponding signal in air is :
A
$${c \over {{f_c} + {f_m}}}$$
B
$${c \over {{f_c}}}$$
C
$${c \over {{f_c} - {f_m}}}$$
D
$${c \over {{f_m}}}$$
3
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
Out of Syllabus
Given below are two statements :

Statement I : A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The bandwidth requirement for the signal is 4 kHz.

Statement II : The side band frequencies are 1002 kHz and 998 kHz.

In the light of the above statements, choose the correct answer from the options given below :
A
Statement I is false but Statement II is true
B
Both Statement I and Statement II are false
C
Statement I is true but Statement II is false
D
Both Statement I and Statement II are true
4
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
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