Wgu D413 Telecomm and Wireless Communications – 190 Original Practice Questions with Answers & Rationales

Wgu D413 Telecomm and Wireless Communications –
190 Original Practice Questions with Answers &
Rationales

SECTION 1 | Telecom Fundamentals & Signals | Q1–Q25
Q1. Which term describes the maximum theoretical amount of data that can travel across a
communication channel in a given amount of time?
A. Latency
B. Bandwidth
C. Jitter
D. Attenuation
Correct Answer: B
Rationale: Bandwidth is the maximum data-carrying capacity of a link.
Q2. Which signal type continuously varies over time and can represent information by
changes in amplitude or frequency?
A. Digital signal
B. Analog signal
C. Packet signal
D. Optical signal only
Correct Answer: B
Rationale: Analog signals vary continuously, unlike digital signals.
Q3. Which signal type uses discrete values such as 0s and 1s to represent data?
A. Analog
B. Digital
C. Acoustic
D. Thermal
Correct Answer: B
Rationale: Digital signals use discrete binary states.

,Q4. What is attenuation in telecommunications?
A. Increase in signal strength
B. Loss of signal strength over distance
C. Conversion of radio waves to light waves
D. A type of encryption
Correct Answer: B
Rationale: Attenuation is signal weakening as it travels.
Q5. Which device is used to regenerate or amplify weakened signals over long transmission
distances?
A. Repeater
B. Switch
C. Hub
D. Router
Correct Answer: A
Rationale: Repeaters restore signal strength.
Q6. What does latency measure in a network?
A. Signal strength
B. Time delay in transmission
C. Frequency range
D. Packet size only
Correct Answer: B
Rationale: Latency is the delay between sending and receiving data.
Q7. Which term describes rapid variation in packet delay?
A. Jitter
B. Bandwidth
C. Duplexing
D. Modulation
Correct Answer: A
Rationale: Jitter refers to inconsistent delay timing.
Q8. Which communication mode allows data to travel in both directions, but only one
direction at a time?

,A. Simplex
B. Half-duplex
C. Full-duplex
D. Broadcast
Correct Answer: B
Rationale: Half-duplex supports two-way communication, one direction at a time.
Q9. Which communication mode allows simultaneous transmission in both directions?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Narrowband
Correct Answer: C
Rationale: Full-duplex permits both directions at once.
Q10. Which communication mode transmits data in only one direction?
A. Simplex
B. Half-duplex
C. Duplex
D. Bidirectional
Correct Answer: A
Rationale: Simplex is one-way communication.
Q11. Which concept refers to the number of cycles per second in a signal?
A. Amplitude
B. Frequency
C. Phase
D. Polarization
Correct Answer: B
Rationale: Frequency is measured in hertz.
Q12. Which characteristic of a wave refers to its height or strength?
A. Frequency
B. Amplitude

, C. Wavelength
D. Period
Correct Answer: B
Rationale: Amplitude indicates signal strength.
Q13. Which property of a wave is measured as the distance between identical points on
consecutive cycles?
A. Wavelength
B. Attenuation
C. Phase shift
D. Jitter
Correct Answer: A
Rationale: Wavelength is the physical length of one cycle.
Q14. Which term describes the position of a wave at a specific point in its cycle?
A. Amplitude
B. Frequency
C. Phase
D. Polarization
Correct Answer: C
Rationale: Phase identifies the timing position within a wave cycle.
Q15. What is a carrier wave?
A. A signal that carries information after modulation
B. A cable that carries electricity
C. A packet containing headers only
D. A type of antenna
Correct Answer: A
Rationale: A carrier wave is modified to transmit data.
Q16. Which process combines information with a carrier wave for transmission?
A. Switching
B. Modulation
C. Encryption
D. Routing