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Unformatted text preview: Class Test – Answers and solutions True or false (2 marks per correct answer, -1 penalty for incorrect answers, total maximum of 20 marks) 1. True 2. True 3. False 4. False 5. True 6. False 7. True 8. False 9. False 10. True Short answers (3 marks per correct answer each, 15 marks total) 1. What is the channel capacity for a teleprinter channel with 300Hz bandwidth and SNR of 3dB where the noise is white thermal noise? SNR dB = 3 = 10logSNR, SNR = 10 0.3 = 1.995 C = B*log 2 (1+SNR)= 474.76 bit/s 2. How long will it take to transmit a block of data of 4MB on a distance of 10000km if average speed of the signal is 0.8c (speed of light c=3 * 10 8 m/s) and data rate is 500 bit/s. The dalay in sending a signal over distance d=10000km with a speed of v=0.8c=2.4*10 8 m/s is Equal to t d = d/v = 1/24 s, Time to transmit 4MB data at a rate of 500bit/s t t = 4*10 6 /500=8000 s Total time t = t t + t d = 8000.04 s 3. Calculate the height of a radio antenna which could cover line of sight transmission in a circle of...
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- Fall '10