351 Midterm Exam solutions

False i when performing a dft the frequency

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Unformatted text preview: e / False (i) When performing a DFT, the frequency resolution can be improved by increasing the sampling rate (circle one): True / False poorly-phrased question, either answer is valid (j) Frequency leakage occurs when the sampling time does not coincide with an integer multiple of the period of the sampled signal (circle one): True / False (k) An A/D system with a sampling rate of fs = 500Hz is used to measure a pure sinusoid given by g(t) = 10sin(2π 800 t). What frequency is recorded by the A/D system? fN = fs/2 = 250 Hz Frequency folding yields: 250 - (800-3x250) = 250 - 50 = 200 Hz Note: you should be able to construct your own folding diagram to yield the same result (l) An A/D system with a sampling rate of fs = 500Hz is used to measure a pure sinusoid given by g(t) = 10sin(2π 1600 t). What frequency is recorded by the A/D system? Frequency folding yields: 1600-6x250 = 1600 - 1500 = 100 Hz (m)The sampled signal in (l) is in-phase with y(t): True / False (n) By choosing equal nominal values for the resistors in a Wheatstone bridge, the voltage input-output relationship becomes linear (circle one): True / False poorly-phrased question, either answer is valid (o) By choosing equal nominal values for the resistors in a Wheatstone bridge, the sensitivity of the system to changes in a single resistor is maximized (circle one): True / False 2 30 pts 2. Consider a periodic sawtooth function defined as: y(t) = -t for -π < t ≤ π (a) What is the period T for this functio...
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This document was uploaded on 02/06/2014.

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