This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
Out of Syllabus
An amplitude modulated signal is plotted below :

Which one of the following best describes the above signal ?
A
(1 + 9sin (2$$\pi$$ $$\times$$ 104 t)) sin(2.5$$\pi$$ $$\times$$ 105t) V
B
(9 + sin (4$$\pi$$ $$\times$$ 104 t)) sin(5$$\pi$$ $$\times$$ 105t) V
C
(9 + sin (2$$\pi$$ $$\times$$ 104 t)) sin(2.5$$\pi$$ $$\times$$ 105t) V
D
(9 + sin (2.5$$\pi$$ $$\times$$ 104 t)) sin(2$$\pi$$ $$\times$$ 104t) V
2
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
Out of Syllabus
An amplitude modulated signal is given by V(t) = 10[1 + 0.3cos(2.2 $$\times$$ 104 t)] sin(5.5 $$\times$$ 105 t). Here t is in seconds. The sideband frequencies (in kHz) are, [Given $$\pi$$ = 22/7]
A
892.5 and 857.5
B
89.25 and 85.75
C
1785 and 1715
D
178.5 and 171.5
3
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
Out of Syllabus
The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?
A
2900 kHz
B
2750 kHz
C
2250 kHz
D
2000 kz
4
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
Out of Syllabus
A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower is LOS (Line of Sight) mode ? (Given : radius of earth = 6.4 × 106 m).
A
40 km
B
65 km
C
48 km
D
80 km
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