WGU D413 Telecommunications and Wireless Communications Exam with Questions and Answers

WGU D413 Telecommunications and Wireless Communications Exam with Questions and Answers Which of the following best explains how the Shannon-Hartley theorem relates to data transmission capacity in a communication channel? a decreasing bandwidth increases channel capacity regardless of noise b increasing noise improves channel capacity by boosting signal variability c increasing signal-to-noise ratio increases channel capacity for a fixed bandwidth d reducing signal power increases capacity by reducing interference Correct Answer: c Rationale: The Shannon-Hartley theorem shows that channel capacity increases with bandwidth and signal-to-noise ratio (SNR). Specifically, higher SNR means the signal is clearer relative to noise, allowing more reliable data transmission and thus higher capacity. Reducing noise or increasing signal strength improves SNR, which directly improves capacity. What is the minimum sampling rate required according to the Nyquist theorem for accurate signal reconstruction? a equal to the highest signal frequency b twice the highest frequency component of the signal c half the highest frequency component of the signal d four times the highest frequency component of the signal Correct Answer: b Rationale: The Nyquist theorem states that to avoid aliasing and accurately reconstruct a signal, the sampling rate must be at least twice the highest frequency present in the signal. Sampling below this threshold leads to distortion and loss of information.