# first - AL of EngineeringFirst Exam Time 70 miMarks 25Couse...

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Unformatted text preview: AL- QUDSUNIVERSITYFaculty of EngineeringFirst Exam Time: 70 minNovember 01, 2008Marks: 25Couse: Communication Systems (0331411)Instructor:Dr. Ali JamoosStudent NameRegistration NumberQuestion NumberGradeQ1Q2Q3Q4Q5Q6TotalPlease try to write as clean as possible!Good Luck1Q1)Circle the correct answer: [10 points]1. The spectrum of the AM radio signal is in the range:(a) 88–108 MHz band(b) 0.6–1.6 MHz (c) 900–2400 MHz (d) 300–3400 Hz2. If the carrier signal frequency is 900MHz, the corresponding wavelength is:(a) 1/3 m(b) 1/2 m (c) 3 m (d) 2 m3. A sampling rate of 8000 sample/s and a 128 quantization levels are used to generate a PCM signal, the resulting data rate is:(a) 56 Kbps(b) 64 Kbps (c) 40 Kbps (d) 80 Kbps 4. The frequency range of voice channels can be limited to:(a) 88–108 MHz band (b) 0.6–1.6 MHz (c) 900–2400 MHz (d) 300–3400Hz5. The device that converts digital data into analog signal and visa versa is known as:(a) codec (b) modem(c) amplifier (d) repeater6. Given a channel with 5MHz bandwidth, the data rate that can be achieved by QPSK signals is: 6....
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first - AL of EngineeringFirst Exam Time 70 miMarks 25Couse...

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