Communication System Test

Result

Communication System Test - 36

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Weekly Quiz Competition

Question 1
4 / -1

An antenna is a device

A
That converts electromagnetic energy into radio frequency signal

B
That converts radio frequency signal into electromagnetic energy

C
That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa

D
None of the above
Question 2
4 / -1

While tuning in a certain broadcast station with a receiver, we are actually

A
Varying the local oscillator frequency

B
Varying the frequency of the radio signal to be picked up

C
Tuning the antenna

D
None of the above
Question 3
4 / -1

Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is

A
9 × 10¹⁷

B
3 × 10¹⁶

C
9 × 10¹⁵

D
3 × 10¹⁹

Solution
Question 4
4 / -1

In a communication system, noise is most likely to affect the signal

A
At the transmitter

B
In the channel or in the transmission line

C
In the information source

D
At the receiver
Question 5
4 / -1

Let A= light obtained by stimulated and B= light obtained by spontaneous emission, then

A
A is incoherent, B is incoherent

B
A is incoherent, B is coherent

C
A is coherent, B is coherent

D
A is coherent, B is incoherent
Question 6
4 / -1

In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is

A
7.143

B
8

C
0.71

D
350

Solution
Question 7
4 / -1

Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is that

A
The receiver antenna is unable to detect the signal at a distance greater than 100 km

B
The TV programme consists of both audio and video signals

C
The TV signals are less powerful than radio signals

D
The surface of earth is curved like a sphere
Question 8
4 / -1

Advantage of optical fibre

A
High bandwidth and EM interference

B
Low bandwidth and EM interference

C
High bandwidth, low transmission capacity and no EM interference

D
High bandwidth, high data transmission capacity and no EM interference
Question 9
4 / -1

In frequency modulation

A
The amplitude of modulated wave varies as frequency of carrier wave

B
The frequency of modulated wave varies as amplitude of modulating wave

C
The frequency of modulated wave varies as frequency of modulating wave

D
The frequency of modulated wave varies as frequency of carrier wave
Question 10
4 / -1

Audio signal cannot be transmitted because

A
The signal has more noise

B
The signal cannot be amplified for distance communication

C
The transmitting antenna length is very small to design

D
The transmitting antenna length is very large and impracticable

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Communication System Test - 36

Result

Communication System Test - 36

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SHARING IS CARING

Question 1

That converts electromagnetic energy into radio frequency signal

That converts radio frequency signal into electromagnetic energy

That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa

None of the above

Question 2

Varying the local oscillator frequency

Varying the frequency of the radio signal to be picked up

Tuning the antenna

None of the above

Question 3

9 × 1017

3 × 1016

9 × 1015

3 × 1019

Solution

Question 4

At the transmitter

In the channel or in the transmission line

In the information source

At the receiver

Question 5

A is incoherent, B is incoherent

A is incoherent, B is coherent

A is coherent, B is coherent

A is coherent, B is incoherent

Question 6

7.143

8

0.71

350

Solution

Question 7

The receiver antenna is unable to detect the signal at a distance greater than 100 km

The TV programme consists of both audio and video signals

The TV signals are less powerful than radio signals

The surface of earth is curved like a sphere

Question 8

High bandwidth and EM interference

Low bandwidth and EM interference

High bandwidth, low transmission capacity and no EM interference

High bandwidth, high data transmission capacity and no EM interference

Question 9

The amplitude of modulated wave varies as frequency of carrier wave

The frequency of modulated wave varies as amplitude of modulating wave

The frequency of modulated wave varies as frequency of modulating wave

The frequency of modulated wave varies as frequency of carrier wave

Question 10

The signal has more noise

The signal cannot be amplified for distance communication

The transmitting antenna length is very small to design

The transmitting antenna length is very large and impracticable

User

Question Analysis

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9 × 10¹⁷

3 × 10¹⁶

9 × 10¹⁵

3 × 10¹⁹