A level Communication Systems Quiz 1

16 Questions

Quiz Description

In this quiz, we will be concentrating on communication with respect to machines or computers in general. Communication is a way of transferring or conveying information in an understandable way that can be sent and received. And you will be amazed to know that Studying communication can improve how we see others as communication is the best way we meet others, develop and manage relationships and work effectively with them.

A communication system is a system model that describes communication between two stations, transformer, and receiver.In order for information to pass from source to a destination during communication, it passes through a special route known as a channel. There are two types of communication systems, Line and radio communication systems.These two are based on physical  infrastructure. The types according to baseband signals, we have analog and digital communication systems.

On taking the quiz, you will find MCQs with one and only one correct answer, and you have a chance of ¼ to have a pass mark per question. After the quiz, you can find more quizzes by going back to our home website. There are also more Computer Science quizzes.

Good luck!

1:

The radio waves of frequency 300 MHz to 3000 MHz belong to


Correct
  • 1:
    High frequency band
  • 2:
    Ultra high frequency band
  • 3:
    Very high frequency band
  • 4:
    Super high frequency band
2:

Which of the following mode of propagation is used to send radio-waves from one place to another?


Correct
  • 1:
    Space wave propagation
  • 2:
    Sky wave propagation
  • 3:
    Ground wave propagation
  • 4:
    All of them
3:

A TV tower has a height of 100 m. The maximum distance upto which the T.V. Trans- mission can be received (Radius of earth = 8 X 106 m)?


Correct
  • 1:
    34.77 km
  • 2:
    32.70 km
  • 3:
    40 km
  • 4:
    40.70 km
4:

Which of the following is not transducer?


Correct
  • 1:
    Loudspeaker
  • 2:
    Microphone
  • 3:
    Amplifier
  • 4:
    All of these
5:

Modulation is the process of superposing


Correct
  • 1:
    low frequency message signal on high frequency waves
  • 2:
    high frequency message signal on low frequency audio waves
  • 3:
    high frequency audio signal on low frequency audio signal
  • 4:
    low frequency radio signal on high frequency audio waves
6:

 If both the length of an antenna and the wave length of the signal to be transmitted are doubled, the power radiated by the antenna


Correct
  • 1:
    is doubled
  • 2:
    is halved
  • 3:
    increases 16 times
  • 4:
    remains constant
7:

 Which mode of communication is/are not employed for the transmission of T.V. signals?


Correct
  • 1:
    Ground wave propagation
  • 2:
    Sky wave propagation
  • 3:
    Both (a) and (b)
  • 4:
    None of these
8:

A transmitting antenna at the top of a tower has a height 3200 cm and that of the receiving antenna is 5000 cm. The maximum distance between them for satisfactory communication in line of sight mode is:

(Radius of earth = 6.4 X 10^6 m)


Correct
  • 1:
    1.5 × 10^3 m
  • 2:
    5.5 × 10^3 m
  • 3:
    4.5 × 10^3 m
  • 4:
    4.5 × 10^4 m
9:

Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication:


Correct
  • 1:
    A is transmitted via space wave while B and C are transmitted via sky wave.
  • 2:
    A is transmitted via ground wave, B via sky wave and C via space wave.
  • 3:
    B and C are transmitted via ground wave while A is transmitted via sky wave.
  • 4:
    B is transmitted via ground wave while A and C are transmitted via space wave.
10:

A 100m long antenna is mounted on a 500m tall building. The complex can become a transmission tower for waves with λ


Correct
  • 1:
    ~ 400 m.
  • 2:
    ~ 25 m.
  • 3:
    ~ 150 m.
  • 4:
    ~ 2400 m.
11:

A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the side bands will be


Correct
  • 1:
    1.003 MHz and 0.997 MHz.
  • 2:
    3001 kHz and 2997 kHz.
  • 3:
    1003 kHz and 1000 kHz.
  • 4:
    1 MHz and 0.997 MHz.
12:

A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to


Correct
  • 1:
    poor selection of modulation index (selected 0 < m < 1)
  • 2:
    poor bandwidth selection of amplifiers.
  • 3:
    poor selection of carrier frequency
  • 4:
    loss of energy in transmission.
13:

A basic communication system consists of

  • (A) transmitter.
  • (B) information source.
  • (C) user of information.
  • (D) channel.
  • (E) receiver.
    Choose the correct sequence in which these are arranged in a basic communication system:

Correct
  • 1:
    ABCDE
  • 2:
    BADEC
  • 3:
    BDACE
  • 4:
    BEADC
14:

An audio signal of 15kHz frequency cannot be transmitted over long distances without modulation because


Correct
  • 1:
    the size of the required antenna would be at least 5 km which is not convenient.
  • 2:
    the audio signal can not be transmitted through sky waves.
  • 3:
    the size of the required antenna would be at least 20 km, which is not convenient.
  • 4:
    effective power transmitted would be very low, if the size of the antenna is less than 5 km.
15:

Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?


Correct
  • 1:
    The side band frequencies are 1506 kHz and 1494 kHz.
  • 2:
    The bandwidth required for amplitude modulation is 6kHz.
  • 3:
    The bandwidth required for amplitude modulation is 3 MHz.
  • 4:
    The side band frequencies are 1503 kHz and 1497 kHz.
16:

A TV trasmission tower has a height of 240 m. Signals broadcast from this tower will be received by LOS communication at a distance of (assume the radius of earth to be 6.4 × 10 6 m)


Correct
  • 1:
    100 km.
  • 2:
    24 km.
  • 3:
    55 km.
  • 4:
    50 km.

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A level Communication Systems Quiz 1
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