13. What is true for frequency division multiplexing? A. It is a technique for t

Question

13. What is true for frequency division multiplexing? A. It is a technique for transmitting information from several different sources simultaneously over a wideband channel. B. It is a technique for transmitting information from several different sources serially over a wideband channel. C. It is a technique for transmitting information from several different sources serially and simultancously over a wide band channel. D. It is not used in digital transmission. E. None of the above is true. 14. In a satellite communication system, a feeder link may represent A. An uplink B. A down link C. Neither an up link nor a down link O. Both an up link and a down link E. None of the above is true. I5. What is true for the amplitude shift keying? A. In this technique, a binary signal is switched on and off with a carrier sinusoid. B. In this technique, a carrier sinusoid is switched on and off with a binary signal. C. In this technique, a binary signal is shifter with a carrier sinusoid. D. In this technique, a carrier sinusoid is shifter with a binary signal. E. None of the above is true 16. An up link frequency is: A. 1.6MH B. 16 MHz C. 160 MHz D. 1600MHz E. None of the above is true.

Explanation / Answer

13. In frequency division multiplexing the adjacent bands are seperated in frequency so they different sources occupying different bands can transmit simultaneously over wideband channel. Hence A is true

14.A feeder link is the link from the earth station to the space station or vice versa.Feeder link has both a forward uplink and return downlink . Hence it may represent both uplink and downlink.D is the correct alternative

15 Amplitude of the carrier is varied according to the binary source.It is known as on-off keying because amplitude of the carrier wave is switching on and off in accordance with the binary signal B is the correct alternative

16 An uplink frequency is usually in gigahertz 1600 MHz seems right

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