Description : _______ uses twocarriers, onein-phase andthe otherquadrature. A) ASK B) PSK C) FSK D) QAM
Last Answer : QAM
Description : Quadrature amplitude modulation(QAM) isa combination of ___________. A) ASK and FSK B) ASK and PSK C) PSK and FSK D) none of the above
Last Answer : ASK and PSK
Description : In_________, the frequencyof the carrier signal is varied to representdata. Both peak amplitudeand phase remain constant. A) ASK B) PSK C) FSK D) QAM
Last Answer : FSK
Description : In________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remainconstant. A) ASK B) PSK C) FSK D) QAM
Last Answer : ASK
Description : DMT is a modulation technique that combineselements of _______ and _______. A) FDM; TDM B) QDM; QAM C) FDM; QAM D) PSK; FSK
Last Answer : FDM; QAM
Description : The sinusoidal carrier is pulsed so that one of the binary states is represented by a carrier while the other is represented by its absence. A. FSK B. ASK C. PSK D. QAM
Last Answer : B. ASK
Description : Which of the following is not a digital-to-analogconversion? A) ASK B) PSK C) FSK D) AM
Last Answer : AM
Description : Modulation in which no signal is present between pulses A. Pulse modulation B. QAM C. PSK D. FSK
Last Answer : A. Pulse modulation
Description : Inan HFC network, the downstream data are modulated using the _______ modulation technique. A) PSK B) QAM C) PCM D) ASK
Description : Digital modulation technique used in modems. A. ASK B. PSK C. FSK D. All of these
Last Answer : B. PSK
Description : In_______, the peakamplitude of one signal level is 0; the other is thesame as the amplitude of the carrier frequency. A) PSK B) OOK C) FSK D) none of the above
Last Answer : OOK
Description : Which of the following is not an analog-to-analog conversion? A) AM B) PM C) FM D) QAM
Description : Inan HFC network, the upstream data are modulated using the _______ modulation technique. A) QAM B) QPSK C) PCM D) ASK
Last Answer : QPSK
Description : If digitaldata rateof 9600 bps is encoded using 8-level phaseshift keying (PSK) method, the modulation rate is A. 1200 bands B. 3200 bands C. 4800 bands D. 9600 bands E. None of the above
Last Answer : 3200 bands
Description : If the bit rate for an FSK signal is1200 bps, thebaud rate is ________. A) 300 B) 400 C) 600 D) 1200
Last Answer : 1200
Description : The constellation diagram of16-QAM has ______ dots. A) 4 B) 16 C) 8 D) none of the above
Last Answer : 16
Description : In________, the phase of thecarrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant. A) ASK B) PSK C) FSK D) QAM
Last Answer : PSK
Description : If the baudrate fora 64-QAM signal is 2000, what is the bit rate? A) 300 B) 400 C) 1000 D) 12000
Last Answer : 12000
Description : If the bit rate for a16-QAM signal is 4000 bps, what is the baudrate? A) 300 B) 400 C) 1000 D) 1200
Last Answer : 1000
Description : In QAM,both ________ of acarrier frequencyare varied. A) frequencyand amplitude B) phase andfrequency C) amplitudeand phase D) none of the above
Last Answer : amplitudeand phase
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 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
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 : ________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
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 : 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 : Data canbe ________. A) analog B) digital C) (a) or (b) D) none of the above
Last Answer : (a) or (b)
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 : 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 : 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