1
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
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
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
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
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
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination