This chapter is currently out of syllabus
1
COMEDK 2023 Morning Shift
+1
-0
Out of Syllabus

A TV tower has a height $$72 \mathrm{~m}$$. The maximum distance upto which TV transmission can be received is (Take, radius of the earth as $$\left.6.4 \times 10^6 \mathrm{~m}\right)$$

A
27.52 km
B
34.25 km
C
30.35 km
D
25.12 km
2
COMEDK 2022
+1
-0
Out of Syllabus

Maximum amplitude of message signal in amplitude modulation is 20 cm. If the amplitude of carrier wave is 40 cm, then modulation index of modulated wave is

A
1
B
0.5
C
0.25
D
2
3
COMEDK 2021
+1
-0
Out of Syllabus

In detector, output circuit consists of $$R=10~k\Omega$$ and $$C=100~pF$$. The frequency of carrier signal which it can detect is

A
> > 1 MHz
B
0.1 kHz
C
> > 1 GHz
D
10$$^3$$ Hz
4
COMEDK 2021
+1
-0
Out of Syllabus

An optical fibre communication system works on a wavelength of 1.3 $$\mu$$m. The number of subscribers it can feed, if a channel requires 20 kHz are

A
$$2.3\times10^{10}$$
B
$$1.15\times10^{10}$$
C
$$1\times10^{5}$$
D
None of these
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