Tag: elements of a communication system

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

A complete communication system must include:

  1. a transmitter and receiver

  2. a transmitter, a receiver, and a channel

  3. a transmitter, a receiver, and a spectrum analyzer

  4. a multiplexer, a demultiplexer, and a channel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A communication system requires a transmitter to upload the signal, a receiver to receive the signal and a channel to carry this information

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

An antenna is a device that converts

  1. electromagnetic energy into radio frequency

    signal

  2. radio frequency signal into electromagnetic

    energy

  3. guided electromagnetic waves into free space

    electromagnetic waves

  4. free space electromagnetic waves into guided

    electromagnetic waves
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

$Answer:-$ C ,D

An antenna (plural antennae or antennas), or aerial, is an electrical device which converts electric power (guided electromagnetic waves) into radio waves(free spaceelectromagnetic waves), and vice versa. It is usually used with a radio transmitter or radio receiver.

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

The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?

  1. 2250 kHz

  2. 2900 kHz

  3. 2750 kHz

  4. 2000 kHz
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As calculated previously, the carrier frequency is 2500 kHz. The next available channel for an AM station would be 2500 kHz + 250 kHz = 2750 kHz.