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 : Which of the following is not an analog-to-analog conversion? A) AM B) PM C) FM D) QAM
Last Answer : QAM
Description : __________ conversion involves three techniques: line coding,block coding, and scrambling. A) Analog-to-digital B) Digital-to-analog C) Analog-to-analog D) Digital-to-digital
Last Answer : Digital-to-digital
Description : PCM is an example of _______ conversion. A) digital-to-digital B) digital-to-analog C) analog-to-analog D) analog-to-digital
Last Answer : analog-to-digital
Description : Computers cannot communicate with each other directly over telephone lines because they usedigitalpulses whereas telephone lines useanalog sound frequencies. What is the name of the device which permits digital to analog ... A. Interface B. Modem C. Attenuation D. Teleprocessor E. None of the above
Last Answer : Modem
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 : Data canbe ________. A) analog B) digital C) (a) or (b) D) none of the above
Last Answer : (a) or (b)
Description : Both frequency and phase modulation utilize ________ modulation A. Phase B. AM and FM C. Digital D. Angle
Last Answer : D. Angle
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 : 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 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 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
Last Answer : analog
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 : FSM isan _________technique. A) analog B) digital C) either (a)or (b) D) none of the above
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 : ASK, PSK, FSK,and QAM are examples of________conversion. A) digital-to-digital B) digital-to-analog C) analog-to-analog D) analog-to-digital
Last Answer : digital-to-analog
Description : A(n)_________ signal is a composite analogsignal with an infinite bandwidth. A) digital B) analog C) either (a)or (b) D) neither (a) nor (b
Last Answer : digital
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 : _____ 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 : _______ data have discretestates and take discrete values. A) Analog B) Digital C) (a) or (b) D) None of the above
Description : _____ data are continuousand take continuous values. A) analog B) digital C) (a) or (b) D) none of the above
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 : 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 : A single channel is shared by multiple signals by _____ a. analog modulation b. digital modulation c. multiplexing d. phase modulation
Last Answer : c. multiplexing
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 : 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 : The signal which has infinitely many levels of intensity over a period of time is called ……… A. digital signal B. analog signal C. both a and b D. sound signal
Last Answer : A. digital signal
Description : The conversion of digital signal into analog for purposes of transmitting into the telephone line is done through ______. A. ISDN B. Radio C. RS232C D. Modem
Last Answer : D. Modem
Description : Which of the following steps is/are not required for analog to digital conversion ? (a) Sensing (b) Conversion (c) Amplification (d) Conditioning (e) Quantization Codes : (A) (a) and (b) (B) (c) and (d) (C) (a), (b) and (e) (D) None of the above
Last Answer : (D) None of the above
Description : State working principle of analog to digital and digital to analog conversion.
Last Answer : i) Analog-to-digital Converters: In a digital computer control system, the plant output (or controlled variable) is usually an analog signal, which is measured by sensors (or instruments). This ... that provides an output voltage or current normalized to a full-scale (FS) reference value.
Description : In_____ transmission, thephaseof the carrier signal is modulated to follow the changingvoltage level (amplitude) of the modulating signal. A) AM B) PM C) FM D) none of the above
Last Answer : PM
Description : In_____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude)of the modulating signal. The peak amplitude and phase of the carrier signal remainconstant,but as ... of thecarrier changes correspondingly. A) AM B) PM C) FM D) none of the above
Last Answer : FM
Description : In_____ transmission, thecarrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal. A) AM B) PM C) FM D) none of the above
Last Answer : AM
Description : A hybrid computer is the one having combined properties of ________ (A) Micro & Mini computers (B) Mini & Super Computers (C) Mainframe & Super Computers (D) Analog & Digital computers
Last Answer : (D) Analog & Digital computers
Description : Thetwo most common digital services are ________ service and______. A) switched/56; switched/64 B) switched/56; DDS C) DDS; swiched 64 D) leased; out-of-band
Last Answer : switched/56; DDS
Description : The Federal Communications Commission (FCC) allows ______ kHz for each FM station. A) 20 B) 100 C) 200 D) none of the above
Last Answer : 100
Description : What frequency range is used for FM radio transmission? A. Very Low Frequency : 3 kHz to 30. kHz B. Low Frequency :30 kHz to 300 kHz C. High Frequency :3 MHz to 30 MHz D. Very High Frequency : 30 MHz to 300 MHz E. None of the above
Last Answer : Very High Frequency : 30 MHz to 300 MHz
Description : What modulation is normally used with digital data? A. AM B. FM C. SSB D. QPSK
Last Answer : D. QPSK
Description : Analog computer works on the supply of a. Continuous electrical pulses b. Electrical pulses but not continuous c. Magnetic strength d. None of the above
Last Answer : Continuous electrical pulses
Description : An example of an analog communication method is a. laser beam b. microwave c. voice grade telephone line d. all of the above
Last Answer : all of the above
Description : Telephone companiesprovidetwotypes of analog services: analog _______services andanalog _____services. A) switched; in-band B) out-of-band; in-band C) switched; leased D) leased; out-of-band
Last Answer : switched; leased
Description : _____ isan analog multiplexing technique to combine optical signals. A) FDM B) TDM C) WDM D) None of the above
Last Answer : WDM
Description : Which multiplexing technique transmits analog signals? A) FDM B) TDM C) WDM D) (a) and (c)
Last Answer : (a) and (c)
Description : Analog-to-analog conversionis needed if the available bandwidthis _______. A) low-pass B) band-pass C) either (a)or (b) D) neither (a) nor (b)
Last Answer : band-pass