_Signal_Exam03NovQes - NATIONAL UNIVERSITY OF SINGAPORE...

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NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR THE DEGREE OF B.ENG. (ELECTRICAL) / B.ENG. (COMPUTER ENG.) / B.TECH. (ELECTRONICS) (Semester I: 2003/2004) EE2009/EE2009E - SIGNALS November 2003 – Time Allowed: 2 Hours INSTRUCTIONS TO CANDIDATES: 1. This paper contains SIX (6) questions and comprises SIX (6) printed pages. 2. Answer any TWO ( 2 ) questions from Section A, and any TWO ( 2 ) questions from Section B. 3. All questions carry equal marks. 4. This is an OPEN BOOK examination.
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EE2009/EE2009E SIGNALS / Page 2 SECTION A (A NSWER A NY TWO Q UESTIONS ) Q.1 (a) The signal used in a sonar system has a form given roughly by () 2 3 t j a e t x = . Describe how the phase and frequency of this signal change as a function of time. Is the signal periodic? Derive its energy and power. (17 Marks) (b) An engineer is using a sophisticated instrument to generate a test signal for evaluating a communication product. The instrument has graphics controls on a touch panel LCD screen through which the spectrum of the signal can be changed. In one experiment, the controls are as shown in Fig. Q1(b). Find out from first principle if the engineer has requested for a signal that cannot be realized. (8 Marks) Fig. Q1(b) 0 Magnitude f 0 Phase f
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EE2009/EE2009E SIGNALS / Page 3 Q.2 (a) A radar for weather forecasting sends out a sharp pulse and processes the echoes that come back from a storm. In designing the system, a researcher is contemplating on the shape of the pulse that should be sent. In her research on the topic, she
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_Signal_Exam03NovQes - NATIONAL UNIVERSITY OF SINGAPORE...

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