This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
Out of Syllabus
In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwith. The number of channels accomodated for transmitting TV signals of band width 6 MHz are (Take velocity of light c = 3 $$\times$$ 108m/s, h = 6.6 $$\times$$ 10$$-$$34 J-s)
A
3.75 $$\times$$ 106
B
3.86 $$\times$$ 106
C
6.25 $$\times$$ 105
D
4.87 $$\times$$ 105
2
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
Out of Syllabus
A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of 80% will be :
A
7 V
B
28 V
C
11.2 V
D
22.4 V
3
JEE Main 2018 (Offline)
+4
-1
Out of Syllabus
A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz ?
A
2 $$\times$$ 106
B
2 $$\times$$ 103
C
2 $$\times$$ 105
D
2 $$\times$$ 104
4
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
Out of Syllabus
The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance 49 $$\mu$$H and a capacitance of 2.5 nF. It is modulated by an audio signal of $$12$$ $$kHz.$$ The frequency range occupied by the side bands is :
A
13482 kHz $$-$$ 13494 kHz
B
442 kHz $$-$$ 466 kHz
C
63 kHz $$-$$ 75 kHz
D
18 kHz $$-$$ 30 kHz
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