This chapter is currently out of syllabus
1
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
2
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
$${v_0}\sin {\omega _0}t + {{\rm A} \over 2}\sin ({\omega _0} - \omega )t + {A \over 2}\sin ({\omega _0} + \omega )t$$
3
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
Out of Syllabus
In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the height of the receiving antenna is 70m, then the minimum height of the transmitting antenna should be :
(Radius of the Earth = 6.4 × 106 m).
A
40 m
B
20 m
C
51 m
D
32 m
4
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
Out of Syllabus
The wavelength of the carrier waves in a modern optical fiber communication network is close to :
A
1500 nm
B
2400 nm
C
600 nm
D
900 nm
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