Tag: elements of a communication system

Questions Related to elements of a communication system

The useful message that is conveyed during communication is known as

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. text

  2. electric signal

  3. bytes

  4. information

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Correct Option: D
Explanation:

Out of the total message, usually a part is conveyed. This part of message is in form of bits called information.

The term channel is used to indicate

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. the amplitude range allocated to a given source

  2. the frequency range allocated to a given source

  3. the voltage-range allocated to a given source

  4. all of the above

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Correct Option: B
Explanation:

Channel represents the different frequency ranges over with radio frequencies exist. A change in channel for device would mean a change in range of frequency over which the device is being operated.

Consider telecommunication through optical fibres. Which of the following statement is not true?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Optical fibres may have homogenous core with a suitable cladding.

  2. Optical fibres can be graded refractive index.

  3. Optical fibres are subject to electromagnetic interference from outside.

  4. Optical fibres have extremely low transmission loss.

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Correct Option: C
Explanation:

Optical fibres are not subjected to electro-magnetic interference from outside.

Without which of the following a generalized block diagram of communication system is incomplete?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Channel

  2. Receiver

  3. Transmitter

  4. All of the above

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Correct Option: D
Explanation:

Transmitter - which converts the signal in an electrical signal and then sends it.

Channel - which carries the signal.
Receiver - which receives and converts the signal in original form.

These three are essential  for a communication system.

What are the three essential part of a communication system?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. transmitter, channel and receiver

  2. transmitter, information source and receiver

  3. information source ,transmitter and channel

  4. transmitter , noise and channel

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Correct Option: A
Explanation:

Transmitter- which converts the signal in an electrical signal and then send it. Channel - which carries the signal.

Receiver - which receives and converts the signal in original form.
These three are essential  for a communication system.

Which of the following is/are the example(s) of  real life telecommunication system?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Optical fiber communication

  2. Microwave communication

  3. Coaxial cable communication

  4. None of the above

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Correct Option: A,B,C
Explanation:

Optical Fiber Communication, Microwave communication, and  coaxial cable communication are all being used in real life as communication systems. These are the advanced systems with high information transfer rate.

In which year, the radio broadcasting had started in India?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. 1925

  2. 1926

  3. 1927

  4. 1928

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Correct Option: C
Explanation:
According to an agreement of 23 July 1927, the private Indian Broadcasting Company LTD (IBC) was authorised to operate two radio stations; the Bombay station began on 23 July 1927, and the Calcutta station followed on 26 August 1927.

The waves used in telecommunication are

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Infrared

  2. Ultraviolet

  3. Microwaves

  4. Cosmic rays

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Correct Option: C
Explanation:

In general Radio waves are used to transmit television and radio programs and Microwaves are used to transmit satellite television and for mobile phones.

A receiver in a communication system must have

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Pick-up antenna

  2. Demodulator

  3. Amplifier

  4. All of these

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Correct Option: A
Explanation:

A receiver in a communication system must have a pick-up antenna , a demodulator and an amplifier . A pick-up antenna is used to receive the signal . Then demodulator , separates the carrier wave from original signal . And amplifier , gives strength to the weak original signal .

When two or more signals share a common channel, it is called:

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. sub-channeling

  2. signal switching

  3. SINAD

  4. multiplexing

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Correct Option: D
Explanation:

When more than one signal shares a common channel for broadcasting, the method is known as multiplexing. The sent signal will be a single, complex signal and the receiver recovers the separate signals by a process called demultiplexing