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Communication System Test - 24
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Communication System Test - 24

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  • Question 1/10
    4 / -1
    Assertion The electrical conductivity of earth\'s atmosphere decreases with altitude.
    Reason The high energy particles (i.e., γ-rays and cosmic rays) coming from outer space and entering our earth\'s atmosphere cause ionisation of the atoms of the gases present there and pressure of gases decreases with increase in altitude.
  • Question 2/10
    4 / -1
    Assertion The electromagnetic waves of shorter wavelength can travel longer distances on earth\'s surface than those of longer wavelength.
    Reason Shorter the wavelength, larger is the velocity of wave propagation.
  • Question 3/10
    4 / -1
    Assertion The surface wave propagation is used for medium wave band and for television broadcasting.
    Reason The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.
  • Question 4/10
    4 / -1
    Assertion The television broadcasting becomes weaker with increases distance.
    Reason The power transmitted from TV transmitter varies inversely as the distance of the receiver.
  • Question 5/10
    4 / -1
    Assertion Microwave propagation is better than the sky wave propagation.
    Reason Microwaves have frequencies 100 to 300 GHz, which have very good directional properties.
  • Question 6/10
    4 / -1
    Assertion Satellite is an ideal platform for remote sensing.
    Reason Satellite in polar orbit can provide global coverage or continuous coverage of the fixed area in geostationary configuration.
  • Question 7/10
    4 / -1
    Assertion Fax is a modulating and demodulating device.
    Reason It is necessary for exact reproduction of a document.
  • Question 8/10
    4 / -1
    Assertion A dish antenna is highly directional.
    Reason This is because a dipole antenna is omni directional.
  • Question 9/10
    4 / -1
    Assertion Microwave communication is preferred over optical communication.
    Reason Microwaves provide large number of channels and bandwidths compared to optical signals.
  • Question 10/10
    4 / -1
    Assertion A portable AM radio set must be kept horizontal to receive the signals properly.
    Reason Radio waves are polarised electromagnetic waves.
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