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Principles of Communication Mocktest (Midterms) BSIT 307
  • Xai Alexandrei Delos Reyes

  • 問題数 29 • 10/17/2024

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    問題一覧

  • 1

    is the process of converting raw message data into digital signals or waves over a modulator to optimize transmission. This process increases the strength of the signal to have maximum reach.

    Modulation

  • 2

    is the steady waveform in terms of amplitude (height) and frequency

    Carrier signal

  • 3

    it is the message that must be transmitted

    Modulating Signal

  • 4

    is the output signal after the process.

    Modulated Signal

  • 5

    One way to get a high-frequency signal to carry a low-frequency signal is by

    Amplitude Modulation

  • 6

    It is a modulation process focused on modulating or changing the signal's amplitude.

    Amplitude Modulation

  • 7

    are voltage or current variations that occur over time and are displayed on an oscilloscope screen

    Time domain signals

  • 8

    During the modulation of a carrier wave by a modulating signal, new signals are generated at different frequencies as part of the process. These frequencies are called _____

    Sidebands

  • 9

    Sideband signals are illustrated in a _________ where the horizontal axis represents frequency, and the vertical axis represents the signal’s magnitude, whether in voltage, current, or power amplitude.

    Frequency domain

  • 10

    This is known as the ________, also referred to as the degree of modulation or modulating factor/coefficient.

    modulation index

  • 11

    This is known as the ________, also referred to as the degree of modulation or modulating factor/coefficient.

    modulation index

  • 12

    It can be used to derive the modulation index (𝑚) by measuring the values of the modulation and carrier voltages and then calculating the ratio.

    oscilloscope

  • 13

    𝑽𝒎𝒂𝒙 is also known as

    peak value

  • 14

    𝑽𝒎𝒊𝒏, the lowest, is also known as...

    trough

  • 15

    AM means....

    Amplitude Modulation

  • 16

    What is the formula for finding modulating index (𝑚)?

    𝑉𝑚 / 𝑉𝑐 * 100

  • 17

    An imaginary line connects the positive and negative peaks of the carrier waveform. This imaginary line is called an ... ?

    Envelope

  • 18

    A modulation process that puts the message in a carrier wave by changing the instantaneous frequency of the wave.

    Frequency Modulation

  • 19

    It is the amount of change in the carrier frequency caused by the modulating signal. The maximum frequency deviation happens at the maximum amplitude of the modulating signal.

    Frequency Deviation (𝒇𝒅)

  • 20

    The amount of shift depends on the amplitude of the binary signal. This modulation is called

    frequency-shift keying

  • 21

    A modulation process wherein the phase of the carrier signal varies based on the amplitude variation of the message signal or modulating signal.

    Phase Modulation

  • 22

    It starts to lead or compress at the second zero deviation until the next positive peak of the modulating signal. These are called _____?

    lagging phase shifts and leading phase shifts

  • 23

    the signal does a 180°phase shift when it hits binary 1 or 0. The shift happens whether the signal is positive or negative. This process is called

    phase-shift keying or binary phase-shift keying.

  • 24

    When a constant-frequency sine wave modulates a carrier, what is produced?

    two side frequencies or sidebands

  • 25

    Which statement is NOT TRUE about Modulation

    These are voltage or current variations that occur over time and are displayed on an oscilloscope screen.

  • 26

    Which statement is NOT TRUE about Sidebands

    It is done to improve signals often unsuitable for the transmission device

  • 27

    Which statement is NOT TRUE about the characteristics of an Amplitude Modulation

    The carrier frequency shifts proportionately as the modulating signal’s amplitude varies.

  • 28

    Which statement is NOT TRUE about the characteristics of an Frequency Modulation

    An increase/decrease in the amplitude of the modulating signal causes an increase/decrease in the positive and negative peaks of the carrier amplitude.

  • 29

    Which statement is TRUE about Phase Modulation

    A modulation process wherein the phase of the carrier signal varies based on the amplitude variation of the message signal or modulating signal.