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Communication Systems Test - 2

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Communication Systems Test - 2
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  • Question 1
    1 / -0.25

    Electronic communication refers to

    Solution

    Explanation:When information  are sent from one point   to the other  it has to be converted into electrical signal  using transducer.The receiver receives it in its original from using receiver.Such from of communication is called electronic communication.

  • Question 2
    1 / -0.25

    FM Radio set used in cars is

    Solution

    Explanation: Radio means sending energy  with waves. In other words, it 's a method of transmitting electrical energy from one place to another without using any kind of direct, wired connection. That 's why it 's often called  wireless. The equipment that sends out a radio wave is known as a  transmitter; the radio wave sent by a transmitter whizzes through the air —maybe from one side of the world to the other —and completes its journey when it reaches a second piece of equipment called a  receiver((here a radio).

  • Question 3
    1 / -0.25

    For a signal to be reproduced without distortion

    Solution

    Most vibrating objects have more than one resonant frequency and those used in musical instruments typically vibrate at harmonics of the fundamental. A harmonic is defined as an integer (whole number) multiple of the fundamental frequency.

  • Question 4
    1 / -0.25

    A woofer should be fed from the input through a

    Solution

    Woofer is a low frequency loud speaker covering the range 16 Hz to 500 Hz.

  • Question 5
    1 / -0.25

    AM detection is

    Solution

    AM Detector. The detection of AM radio signals is a diode application. The modulated AM carrier wave is received by the antenna of the radio receiver and is rectified by the action of a detector diode. The signal frequency which modulates it is much lower, 0.02 to 5 kHz, and it can pass through the filter.
     

  • Question 6
    1 / -0.25

    The three elements of a generalized communication system are

    Solution

    Explanation:In communication the Transmitter helps in transmitting the signal through communication channel which acts as a physical path that connects transmitter to a receiver.And the receiver receives the transmitted signal and converts those signals in their original form.

  • Question 7
    1 / -0.25

    TV set used in a typical house is

    Solution

    Explanation: The equipment that sends out a radio wave is known as a  transmitter; the radio wave sent by a transmitter whizzes through the air —maybe from one side of the world to the other —and completes its journey when it reaches a second piece of equipment called a  receiver.A  television antenna, or  TV aerial, is an antenna  specifically designed for the reception  of over-the-air broadcast television seignal, which are transmitted at frequencies from about 41 to 250 MHz  in the VHF  band, and 470 to 960  MHz in the UHF  band in different countries..

  • Question 8
    1 / -0.25

    Audio signals have a maximum bandwidth of about

    Solution

    22050Hz (often lazily called "22 kHz ") has been a reasonably popular sample rate for low bit rate MP3s such as 64 kbps in years past. Audio quality is significantly affected, with higher frequency content missing. With the general rise in the availability of large file storage space and faster data links, 22 kHz is now of more limited use.
    1.For speech recording where perceived quality is unimportant, but clarity must be maintained.
    2.AM radio
    3.Formerly used to squeeze much mp3 music onto floppy disk &very small mp3 players.
     

  • Question 9
    1 / -0.25

    Pulse is specified by pulse height or the peak voltage, the pulse duration and pulse to pulse spacing. In pulse amplitude modulation (PAM) what changes with base band signal is

    Solution

    Pulseis specified by pulse height or the peak voltage, the pulse duration and pulse to pulse spacing. In pulse amplitude modulation (PAM) what changes with base band signal is pulse height or the peak voltage.
    Hence the correct answer is option D.

  • Question 10
    1 / -0.25

    A rectifier and an envelope detector for AM uses

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