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1 . R-2R is _______ converter




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2 . What does Data refer to




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3 . The OSI has ______ layers




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4 . Protocols deals with




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5 . _______ can detect and correct errors in data transmission




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6 . Spread spectrum (SS) is a ___________ technique that distributes a signal and its sidebands over a very wide bandwidth.




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7 . The most widespread use of SS is in cellular telephones is known as




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8 . The two most widely used wideband modulation methods are




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9 . QAM uses both




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10 . Hartley's Law is mathematically expressed as




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11 . FSK, PSK, QAM, OFDM are




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12 . Transimssion Efficiency focuses on




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13 . Encoding makes data ________ with medium




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14 . Companding deals with data




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15 . Parallel data transmission is impractical for long-distance communication because of




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16 . ASCII and EBCIDC are widely used codes in




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17 . In digital codes, data processed and stored by computers can be in




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18 . The basic transmission-reception system is a ______ system.




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19 . Some examples of linear codes




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20 . To avoid aliasing




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21 . Analog to digital conversion includes




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22 . Which needs re-sending of signal?




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23 . The frequency hopping system uses ______ modulation scheme




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24 . CDMA rejects




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25 . The process of converting the analog sample into discrete form is called




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26 . Some advantages of spread spectrum are




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27 . The sequence of operations in which PCM is done is




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28 . _______ is s benefit of Digital transmission of data




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29 . Sampling must be done at______ rate




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30 . Sample and Hold Circuit helps the_________ process




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31 . Antennas can usually handle transmitting and receiving of electromagnetic waves. This property is called




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32 . What is the name given to undesirable interference that is added to a signal being transmitted?




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33 . A signal with a wavelength of 1.5 m has a frequency of




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34 . A radio wave used in point to point communication consists of




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35 . In the electromagnetic wave spectrum, the frequency of radio waves ranges from ??? to ???Hz




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36 . A process where the received signal is transformed into its original form is




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37 . A device that can perform both modulation and demodulation is called




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38 . The process of impressing intelligence on the carrier is called




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39 . Which characteristic of a radio receiver refers to its ability to reject an unwanted signal




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40 . There is distortion in intelligence when the modulation index,




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