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
are voltage or current variations that occur over time and are displayed on an oscilloscope screen
Time domain signals
2
This is known as the ________, also referred to as the degree of modulation or modulating factor/coefficient.
modulation index
3
it is the message that must be transmitted
Modulating Signal
4
𝑽𝒎𝒂𝒙 is also known as
peak value
5
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)
6
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
7
𝑽𝒎𝒊𝒏, the lowest, is also known as...
trough
8
The amount of shift depends on the amplitude of the binary signal. This modulation is called
frequency-shift keying
9
Which statement is NOT TRUE about the characteristics of an Amplitude Modulation
The carrier frequency shifts proportionately as the modulating signal’s amplitude varies.
10
is the output signal after the process.
Modulated Signal
11
A modulation process that puts the message in a carrier wave by changing the instantaneous frequency of the wave.
Frequency Modulation
12
It is a modulation process focused on modulating or changing the signal's amplitude.
Amplitude Modulation
13
When a constant-frequency sine wave modulates a carrier, what is produced?
two side frequencies or sidebands
14
AM means....
Amplitude Modulation
15
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
16
This is known as the ________, also referred to as the degree of modulation or modulating factor/coefficient.
modulation index
17
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
18
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
19
An imaginary line connects the positive and negative peaks of the carrier waveform. This imaginary line is called an ... ?
Envelope
20
is the steady waveform in terms of amplitude (height) and frequency
Carrier signal
21
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.
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
Which statement is NOT TRUE about Modulation
These are voltage or current variations that occur over time and are displayed on an oscilloscope screen.
24
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
25
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.
26
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.
27
Which statement is NOT TRUE about Sidebands
It is done to improve signals often unsuitable for the transmission device
28
One way to get a high-frequency signal to carry a low-frequency signal is by
Amplitude Modulation
29
What is the formula for finding modulating index (𝑚)?
𝑉𝑚 / 𝑉𝑐 * 100