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Unformatted text preview: EECS 216 EXAM #2 Winter 2008 1. Fourier series of x(t) is cos( t )+ 1 2 cos(2 t )+ 1 3 cos(3 t )+ . . . Then integraltext π π x ( t ) cos(3 t ) dt =: (a) 0 (b) 1 3 (c) π 6 (d) π 3 (e) 2 π 3 2. Impulse response of an LTI system with frequency response 2 ( jω ) 2 +4( jω )+4 is: (a) Noncausal (b) 2 e 2 t cos(2 t ) u ( t ) (c) e 2 t sin( t ) u ( t ) (d) te 2 t u ( t ) (e) 2 te 2 t u ( t ) 3. An LTI system has impulse response h(t)= sin(20 πt ) 4 t cos(30 πt ). It rejects above: (a) 10 (b) 20 (c) 25 (d) 50 (e) ∞ Hertz. 4. Why would anyone use DSBSC modulation instead of AM radio? (a) Less bandwidth (b) Less power (c) Less noise (d) Simpler receiver (e) Simpler xmitter 5. The minimum sampling rate in RADIAN SECOND to reconstruct [sin(40 t ) sin(60 t )] / [ π 2 t 2 ] from its samples is barely greater than: (a) 80 (b) 120 (c) 160 (d) 200 (e) 240 6. sin(32 πt ) + sin(48 πt ) is sampled at 40 SAMPLE SECOND , then lowpassfiltered to 20 Hz. Get: (a) 0 (b) sin(16 πt ) (c) 2 sin(16...
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This homework help was uploaded on 04/04/2008 for the course EECS 216 taught by Professor Yagle during the Winter '08 term at University of Michigan.
 Winter '08
 Yagle
 Frequency

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