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Communication Systems Test - 3

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Communication Systems Test - 3
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Weekly Quiz Competition
  • Question 1
    4 / -1

    What does the abbreviation WWW mean in communication?

    Solution

    The abbreviation WWW means world wide web in communication.

  • Question 2
    4 / -1

    The process of impressing any information by changing the original signal is called

    Solution

    The process of impressing information by changing the original signal is called ‘modulation’, and it is done in a variety of ways. In all cases the radio waves simply act as a vehicle for the information, so they are commonly called ‘carrier waves’.

  • Question 3
    4 / -1

    Attenuation of a signal is

    Solution

    Attenuation is a general term that refers to any reduction in the strength of a signal. Attenuation occurs with any type of signal, whether digital or analog. Sometimes called loss, attenuation is a natural consequence of signal transmission over long distances.

  • Question 4
    4 / -1

    Repeater stations are used to

    Solution

    A repeater is an automated radio station that extends the range of communications.To use a repeater, a user's radio is configured to receive on the repeater's transmitting frequency, and when the push-to-talk button is pressed, transmit on the repeater's receiving frequency.

  • Question 5
    4 / -1

    Type of modulation used for continuous and sinusoidal wave is

    Solution

    Amplitude modulation, Frequency modulation and Phase modulation are used for the carrier wave which is a continuous wave whereas Pulse amplitude modulation, Pulse width modulation and Pulse position modulation is used if the wave is not a continuous one and is in the form of pulses.

  • Question 6
    4 / -1

    The limiting values of modulation index (μ) of an AM wave is​

    Solution

    For maximum value modulation index can be greater than 1 or it can take any value depending on the amount of carrier present in the overall modulated signal. Maximum value of modulation index in 1. Above 1 over modulation occurs which cause distortion of signal. Minimum value is 0.

  • Question 7
    4 / -1

    The waveform of information, which is being impressed upon the carrier wave, is called the.

    Solution

    In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.

  • Question 8
    4 / -1

    A message of frequency 5 kHz and peak voltage of 2 V is used to modulate a carrier wave of frequency 2 MHz and a peak voltage of 10 V. The modulation index is​

    Solution

    Given, peak voltage of the carrier signal is Vc​=10V and 
     peak voltage of the modulated signal is Vm​=2×1=2V (as peak voltage =2× amplitude of voltage)
    Modulation index is defined as, μ= Vm /Vc​​=2/10=0.0.2

  • Question 9
    4 / -1

    What happens to the power in a FM signal as the modulation index increases?

    Solution

    Power remains constant irrespective of the modulation index in case of F.M. signal.

  • Question 10
    4 / -1

    Which of the following is not a valid option for modulation of waves?

    Solution

    Velocity modulation is then defined as that variation in the velocity of a beam of electrons caused by the alternate speeding up and slowing down of the electrons in the beam. This variation is usually caused by a voltage signal applied between the grids through which the beam must pass.

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