WGU D413 - Telecommunications and Wireless Communications Assessment Study Exam Questions with Correct Answers and Explanations.

WGU D413 - Telecommunications and Wireless
Communications Assessment Study Exam
Questions with Correct Answers and
Explanations.




Question:
Which type of multiplexing is used to send and receive digital signals between
connected devices?

 A Frequency-division multiplexing
 B Wavelength-division multiplexing
 C Time-division multiplexing
 D Statistical multiplexing

Answer:
Time-division multiplexing
Explanation: Time-division multiplexing (TDM) allocates time slots to each signal and
transmits them sequentially over a single channel. It is commonly used in digital
communication systems to send and receive digital signals between connected devices.
FDM separates signals by frequency, WDM is used in fiber optics, and statistical
multiplexing is more dynamic but TDM is the standard for digital signals between
connected devices




Question:
Which factor contributes to signal attenuation?

 A Noise
 B Frequency

, C Phase
 D Amplitude

Answer:
Noise
Explanation: Attenuation is the loss of signal strength over distance. Noise is a primary
factor that contributes to attenuation by interfering with and degrading the signal. While
frequency, phase, and amplitude are signal characteristics, they do not directly cause
attenuation. Noise introduces interference that reduces signal quality, making it a
contributing factor




Question:
Which term is defined as the number of cycles a signal completes in one second?

 A Amplitude
 B Frequency
 C Phase
 D Wavelength

Answer:
Frequency
Explanation: Frequency is defined as the number of complete cycles a signal completes per
second, measured in Hertz (Hz). Amplitude is the height of the wave, phase is the position
of the wave relative to a reference, and wavelength is the physical distance between cycles




Question:
A wave position relative to a reference position is defined as:

 A Amplitude
 B Frequency
 C Phase
 D Wavelength

Answer:
Phase

, Explanation: Phase describes the position of a wave relative to a reference point, typically
measured in degrees or radians. Amplitude is signal strength, frequency is cycles per
second, and wavelength is the distance between corresponding points on consecutive
cycles




Question:
What is the amplitude of a signal?

 A The number of cycles per second
 B The height or strength of the wave
 C The position of the wave relative to a reference
 D The distance between two consecutive peaks

Answer:
The height or strength of the wave
Explanation: Amplitude refers to the height or strength of a signal wave, representing the
signal's power or intensity. It is measured in volts or decibels. Frequency is cycles per
second, phase is relative position, and wavelength is the distance between peaks




Question:
Which of the following describes wavelength?

 A The number of cycles completed in one second
 B The height of the wave
 C The position of the wave relative to a reference
 D The distance between two consecutive identical points on a wave

Answer:
The distance between two consecutive identical points on a wave
Explanation: Wavelength is the physical distance between two consecutive identical points
on a wave, such as peak to peak or trough to trough. Frequency is cycles per second,
amplitude is the height, and phase is the relative position

, Question:
A signal with a frequency of 1000 Hz has how many cycles per second?

 A 100 cycles per second
 B 1000 cycles per second
 C 10 cycles per second
 D 1 cycle per second

Answer:
1000 cycles per second
Explanation: Frequency measured in Hertz directly indicates the number of cycles per
second. A 1000 Hz signal completes 1000 cycles each second. The other options represent
different frequencies and are incorrect




Question:
What does a higher amplitude indicate about a signal?

 A Lower frequency
 B Stronger signal strength
 C Slower transmission speed
 D Shorter wavelength

Answer:
Stronger signal strength
Explanation: Higher amplitude indicates stronger signal strength or greater power. It does
not directly affect frequency, transmission speed, or wavelength. Amplitude is independent
of these other signal characteristics




Question:
What is the period of a signal with a frequency of 10 Hz?

 A 10 seconds
 B 0.1 seconds
 C 1 second
 D 100 seconds