Description : Modulation is theprocessof A. converting analogsignals todigital signals B. converting digital signals toanalog signals C. Multiplexing various signals intohigh speed line signals D. performing data encryption
Last Answer : converting digital signals toanalog signals
Description : Demodulation is aprocessof A. converting analog to digital signals B. converting digital to analogsignals C. multiplexing various signals intoone high speed line signals D. performing data description
Last Answer : converting analog to digital signals
Description : _____ isan analog multiplexing technique to combine optical signals. A) FDM B) TDM C) WDM D) None of the above
Last Answer : WDM
Description : The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as: a. modulation b. demodulation c. synchronizing d. digitising
Last Answer : digitising
Description : The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as a. modulation b. demodulation c. synchronizing d. Digitizing
Last Answer : b. demodulation
Description : Which multiplexing technique transmits analog signals? A) FDM B) TDM C) WDM D) (a) and (c)
Last Answer : (a) and (c)
Description : Bits can be sent over guided and unguided media as analog signal by ___________ a. digital modulation b. amplitude modulation c. frequency modulation d. phase modulation
Last Answer : a. digital modulation
Description : Given the following statements: (a) Frequency Division Multiplexing is a technique that can be applied when the bandwidth of a link is greater than combined bandwidth of signals to be transmitted. (b) Wavelength Division Multiplexing (WDM) ... c) is true. (D) (a), (b) and (d) are true; (c) is false.
Last Answer : (D) (a), (b) and (d) are true; (c) is false.
Description : _____ signals can have an infinite number of values ina range. A) Analog B) Digital C) (a) or (b) D) None of the above
Last Answer : Analog
Description : Which multiplexing technique transmits digital signals? A) FDM B) TDM C) WDM D) None of the above
Last Answer : TDM
Description : Modulation means A. Varying of information B. Utilization of a single transmission channel to carry multiple signals C. Varying of some parameters of a carrier such as its amplitude to transmit information D. Transmit pulses in DC form on a copper wire
Last Answer : C. Varying of some parameters of a carrier such as its amplitude to transmit information
Description : ________is the set of techniques that allows the simultaneous transmission of multiple signalsacrossa single data link. A) Demodulating B) Multiplexing C) Compressing D) None of the above
Last Answer : Multiplexing
Description : _____ isa digital multiplexing technique for combiningseveral low-ratechannels into onehigh-rate one. A) FDM B) TDM C) WDM D) None of the above
Description : _______ is designed to be usedin wirelessapplications in which stations must be ableto sharethe medium without interception by an eavesdropperand without beingsubject tojamming from a malicious intruder. A) Spread spectrum B) Multiplexing C) Modulation D) None of the above
Last Answer : Spread spectrum
Description : The sharing of a medium and its link by two or more devices is called _______. A) modulation B) encoding C) line discipline D) multiplexing
Last Answer : multiplexing
Description : Data from a computer are_______; the local loop handles _______ signals. A) analog; analog B) analog; digital C) digital; digital D) digital; analog
Last Answer : digital; analog
Description : _______ signals canhave only alimited number of values. A) Analog B) Digital C) (a) or (b) D) None of the above
Last Answer : Digital
Description : Compared to analog signals, digital signals A. allow faster transmission B. are moreaccurate C. both (a)and (b) D. All of theabove E. None of the above
Last Answer : both (a)and (b)
Description : Which multiplexing technique involves signals composed of light beams? A) FDM B) TDM C) WDM D) none of the above
Description : The physical layer is responsible for _____ a) line coding b) channel coding c) modulation d) all of the mentioned
Last Answer : d) all of the mentioned
Description : DWDM stands for: a. Digital Wavelength-Division Modulation b. Dense Wavelength-Division Modulation c. Double Wavelength-Division Modulation d. Dense Wavelength-Division Multiplexing
Last Answer : d. Dense Wavelength-Division Multiplexing
Description : _____ data are continuousand take continuous values. A) analog B) digital C) (a) or (b) D) none of the above
Last Answer : analog
Description : Demodulation is the process of A. converting digital signals toanalog signals B. converting analogsignals todigital signals C. combining many low speed channels into onehigh speed channel D. dividing the high-speed signals into frequency bands E. None of the above
Last Answer : converting analogsignals todigital signals
Description : Signals can be ________. A) analog B) digital C) either (a)or (b) D) neither (a) nor (b)
Last Answer : either (a)or (b)
Description : How do you transmit through multiplexing, a thousand of voice channel information over a single fiber optic using on e wavelength? A. Polar division B. Time division C. Fiber division D. Frequency division
Last Answer : B. Time division
Description : In _______ transmission, the channel capacity is shared byboth communicatingdevices at all times. A) simplex B) half-duplex C) full-duplex D) half-simplex
Last Answer : full-duplex
Description : A pure ALOHA Network transmits 200 bit frames using a shared channel with 200 Kbps bandwidth. If the system (all stations put together) produces 500 frames per second, then the throughput of the system is ______. a. 0.384 b. 0.184 c. 0.286 d. 0.58
Last Answer : b. 0.184
Description : Communication channel is shared by all the machines on the network in ________ a) broadcast network b) unicast network c) multicast network d) anycast network
Last Answer : a) broadcast network
Description : A technique used by codes to convert an analog signal into a digital bit stream is known as A) Pulse code modulation B) Pulse stretcher C) Query processing D) Queue management
Last Answer : Answer : A
Description : A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management
Last Answer : a. Pulse code modulation
Description : ________is a multiple-access method in which the available bandwidthof a link is shared in time, frequency, or through code, between different stations. A) Random access B) Controlledaccess C) Channelization D) none of the above
Last Answer : Channelization
Description : The receive GCE system in an earth station performs what function(s)? A. Modulation and multiplexing B. Up conversion C. Demodulation and demultiplexing D. Down conversion
Last Answer : C. Demodulation and demultiplexing
Description : Used for time division multiplexing. A. Frequency modulation B. Pulsed modulation C. SSB D. Amplitude modulation
Last Answer : B. Pulsed modulation
Description : A good example of a pilot tone system used in commercial frequency modulation stations. A. FDM B. Time division C. Stereo multiplexing D. Frequency modulation
Last Answer : C. Stereo multiplexing
Description : ________ is a technique that is used to send more than one call over a single line. a) Digital transmission b) Infrared transmission c) Digitizing d) Multiplexing e) None of these
Last Answer : d) Multiplexing
Description : A hybrid computer a. Resembles digital computer b. Resembles analog computer c. Resembles both a digital and analog computer d. None of the above
Last Answer : Resembles both a digital and analog computer
Description : In analog computer a. Input is first converted to digital form b. Input is never converted to digital form c. Output is displayed in digital form d. All of above
Last Answer : All of above
Description : A digital computer did not score over an analog computer in terms of a. Speed b. Accuracy c. Cost d. Memory
Last Answer : Accuracy
Description : The computer that process both analog and digital is called a. Analog computer b. Digital computer c. Hybrid computer d. Mainframe computer
Last Answer : Hybrid computer
Description : An example of digital, rather than analog, communication is a. DDD b. DDS c. WATS d. DDT
Last Answer : DDS
Description : In a synchronous modem, the digital-to-analog converter transmits signal to the a. equilizer b. modulator c. demodulator d. terminal e. none of aobve
Last Answer : equilizer
Description : The moderntelephone network isnow ________. A) digital B) analog C) digital as well as analog D) none of the above
Last Answer : digital as well as analog
Description : The original telephone network, which is referred to as the plainold telephone system (POTS), was an ________system. A) digital B) analog C) digital as well as analog D) none of the above
Description : FSM isan _________technique. A) analog B) digital C) either (a)or (b) D) none of the above
Description : ________conversion is therepresentation ofanalog information by an analog signal. A) Digital-to-analog B) Analog-to-analog C) Analog-to-digital D) Digital-to-digita
Last Answer : Analog-to-analog
Description : _______ conversionis the process of changing one of the characteristics ofan analog signal basedon the informationin the digitaldata. A) Digital-to-analog B) Analog-to-analog C) Analog-to-digital D) Digital-to-digital
Last Answer : Digital-to-analog
Description : AM and FM are examplesof ________ conversion. A) digital-to-digital B) digital-to-analog C) analog-to-analog D) analog-to-digita
Last Answer : analog-to-analog