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Exam2SP2011 - EE301 Signals and Systems Exam 2 In-Class...

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EE301 Signals and Systems In-Class Exam Exam 2 Tuesday, Mar. 29, 2011 Cover Sheet Test Duration: 75 minutes. Coverage: Chaps. 3,4 Open Book but Closed Notes. One 8.5 in. x 11 in. crib sheet Calculators NOT allowed. All work should be done on the sheets provided. You must show all work for each problem to receive full credit. Plot your answers on the graphs provided. 1
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Multiple Choice Question 1. Circle the best answer below. Let X ( ω ) be the Fourier Transform of a signal x ( t ); as you vary ω , a plot of | X ( ω ) | 2 reveals (a) how the amplitude and phase of a sinewave change as it passes thru an LTI system. (b) how multiplying by a high-frequency cosine makes the signal radiate from an antenna. (c) how the energy of a periodic signal is concentrated at continuous frequencies. (d) how the energy of the signal is distributed as a function of frequency. (e) how two different signals can have the same energy and phase distribution Multiple Choice Question 2. Circle the best answer below. (a) x ( t ) and x ( t - t o ) have the same energy distribution as a function of time. (b) x ( t - t o ) can be obtained by passing x ( t ) thru an LTI system with impulse response h ( t ) = δ ( t - t o ). (c) The respective Fourier Transforms of x ( t ) and x ( t - t o ) differ only by a linear phase term. (d) x ( t ) and x ( t - t o ) have the same energy distribution as a function of frequency. (e) (a), (b), (c), and (d) are all true (f) only (b), (c), and (d) are true Multiple Choice Question 3. Circle the best answer below. Forming the product of a baseband signal with a high-frequency sinewave (a) changes the energy distribution as a function of frequency (b) causes a shift in the frequency-domain (c) makes the signal radiate from an antenna and thereby propagate through space (d) places the signal in another frequency band (e) (a), (b), (c), and (d) are all true (f) only (b), (c), and (d) are true (g) only (c), and (d) are true 2
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Multiple Choice Question 4.
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