Carrier is
A.
One or more conductors that serve as a common connection for a related group of devices
B.
a continuous frequency capableof being modulated or impressed witha second signal
C.
the condition whentwo or more sections attempt to use the same channel at the same time
D.
a collection of interconnected functional units that provides a data communications service among stations attached tothe network
E.
None of the above

1 Answer

Answer :

a continuous frequency capableof being modulated or impressed witha second signa

Related questions

Description : Contention is A. One or more conductors that serve as a common connection for a related group of devices B. a continuous frequency capableof being modulated or impressed witha second signal C. ... that provides a data communications service among stations attached tothe network E. None of the above

Last Answer : the condition whentwo or more stations attempt to use the same channel at the same time

Description : The _______ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, thesignal modulates another carrier frequency. A) FDM B) DSSS C) FHSS D) TDM

Last Answer : FHSS

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, 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 : On a class B network, how manyhostsare availableat eachsite witha subnet mask of 248? A. 16,382 B. 8,190 C. 4,094 D. 2,046 E. 1,022

Last Answer : 2,046

Description : What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

Last Answer : B. The ratio between the deviation of a frequency modulated signal and the modulating frequency.

Description : If frequency of modulated wave is less than frequency of carrier wave, then input signal is A. negative B. positive C. zero D. infinite

Last Answer : negative

Description : A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly

Last Answer : A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly 4 Ghz

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 : What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Last Answer : D. A frequency modulated continuous wave

Description : The Internet Control Message Protocol (ICMP) A. allows gateways to send error acontrol messages toother gateways or hosts B. provides communication between the Internet Protocol Software on one machine ... and takeaction to correct theproblem D. All of theabove E. None of the above

Last Answer : All of theabove

Description : The synchronous modems are more costly than the asynchronous modemsbecause A. they produce largevolumeof data B. they contain clock recovery circuits C. they transmit thedata with stop and start bits. D. they operate witha largerbandwidth E. None of the above

Last Answer : they contain clock recovery circuits

Description : Most data communications involving telegraph lines use: a. simplex lines b. wideband channel c. narrowband channel d. dialed service

Last Answer : narrowband channel

Description : Modulation in which the modulated wave is always present. A. Carrier modulation B. Front-end C. Continuous modulation D. Log-periodic modulation

Last Answer : C. Continuous modulation

Description : Which processor has a single instruction multiple data stream organization that manipulates the common instruction by means of multiple functional units. a. Attached array processor b. SIMD array processor c. Both d. None

Last Answer : b. SIMD array processor

Description : Devices interconnected by the LAN should include A. Computers and terminals B. mass storage device, printers and plotters C. bridges and gateways D. All of theabove E. None of the above

Last Answer : All of theabove

Description : State weather the following statement is true or false for Token Bus 1).It is a linear or tree- shaped cable onto which the stations are attached. 2). the token propagates around the logical ring, with only the token holder ... 3. false C. 1. false, 2. false, 3. false D. 1. true, 2. true, 3. false

Last Answer : D. 1. true, 2. true, 3. false

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 : Inan HFC network, the downstream data are modulated using the _______ modulation technique. A) PSK B) QAM C) PCM D) ASK

Last Answer : QAM

Description : Data integrity control A. is used to set upper and lower limits on numeric data B. requires the use of passwords toprohibit unauthorized access tothe file C. has the data dictionary keep thedate and time ... back-up,and most recent modificationfor all files D. All of theabove E. None of the above

Last Answer : has the data dictionary keep thedate and time of lastaccess last back-up,and most recent modificationfor all files

Description : A 1 Mhz carrier is amplitude modulated by a pure 200-Hz audio test tone. Which of the following combinations of frequencies represent the total content of the AM signal? A. 1 MHz and 200 Hz B. 1 MHz and 1000.2 kHz C. 999.8 kHz, 1000 kHz, and 1000.2 kHz D. 999.8 kHz and 1000.2 kHz

Last Answer : C. 999.8 kHz, 1000 kHz, and 1000.2 kHz

Description : What is the first symbol of a radio signal transmission having an amplitude modulated signal carrier, double side band? A. C B. B C. H D. A

Last Answer : D. A

Description : The modulated picture carrier wave includes the composite video signal as the:

Last Answer : Symmetric envelope of amplitude variations

Description : Which multiplexing technique shifts each signal to a different carrier frequency? A) FDM B) TDM C) Both (a)and (b) D) None of the above

Last Answer : FDM

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 : 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 : Given an AM radio signal with abandwidth of10 KHzand the highest-frequency component at 705 KHz, what is the frequency of the carrier signal? A) 700 KHz B) 705 KHz C) 710 KHz D) Cannot bedetermined from giveninformation

Last Answer : 700 KHz

Description : What is the term used to describe a spread spectrum communications system where the center frequency if a conventional carrier is altered many time per second in accordance with a pseudo ... hopping B. Direct sequence C. Time-domain frequency modulation D. Frequency compandored spread spectrum

Last Answer : A. Frequency hopping

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 : The collection of links throughout the Internet creates an interconnected network called the - 1) WWW 2) Web 3) World Wide Web 4) All of the above

Last Answer : 4) All of the above

Description : The collection of links throughout the Internet creates an interconnected network called the - 1 WWW 2 Web 3 World Wide Web 4 All of the above

Last Answer : 4 All of the above

Description : Four routers haveto be interconnected in a point-to-point Network. Each pair of root us may connect by a high-speed line, a medium speed line ora low speed line. Find the total number of topologies. A. 12 B. 81 C. 48 D. 729

Last Answer : 729

Description : _____ refers tothe structure or format of the data, meaning the order in which they are presented. A) Semantics B) Syntax C) Timing D) All of theabove

Last Answer : Syntax

Description : Geodimeter is based on: (A) Propagation of modulated light waves (B) Propagation of infrared radiation (C) The visible light as carrier with frequency of the order of 5 × 1014 Hz (D) High frequency radio waves

Last Answer : Answer: Option A

Description : A system where the modulated RF picture and sound carrier signals are distributed in a cable network, instead of wireless system.

Last Answer : CATV

Description : Consider a CSMA/CD network that transmits data at a rate of 100 Mbps (108 bits per second) over a 1 km (kilometre) cable with no repeaters. If the minimum frame size required for this network is 1250 bytes, what is the signal speed (km/sec) in the cable? a. 8000 b. 10000 c. 16000 d. 20000

Last Answer : d. 20000

Description : The _______ layer provides a well defined service interface to the network layer, determining how the bits of the physical layer are grouped into frames A. Data Link B. Physical C. Network D. Session

Last Answer : A. Data Link

Description : What is the effect in over modulated amplitude modulated radio broadcasting transmission? A. Interference to adjacent channel B. Higher fidelity C. Increase noise D. Higher audio signal

Last Answer : A. Interference to adjacent channel

Description : ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the ... reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

Last Answer : C. Generates a 1kHz note for Morse code reception

Description : In an Ethernet local area network, which one of the following statements is TRUE ? a. A station stops to sense the channel once it starts transmitting a frame. b. The purpose ... collision is detected. d. The exponential backoff mechanism reduces the probability of collision on retransmissions

Last Answer : The exponential backoff mechanism reduces the probability of collision on retransmissions

Description : A _________ sine wave is not useful in data communications; we need to send a _______signal. A) composite; single-frequency B) single-frequency; composite C) single-frequency;double-frequency D) none of the above

Last Answer : single-frequency; composite

Description : State weather the following statement is true or false for Point-to-Point Protocol 1). It is still in widespread use for dial-up TCP/IP connections 2) Point-to-point circuits in the form of asynchronous lines have long been ... . false C. 1. false, 2. false, 3. false D. 1. true, 2. false, 3. true

Last Answer : D. 1. true, 2. false, 3. true

Description : Satellite-Switched Time-Division Multiple Access (SS/TDMA) is A. the method of determining whichdevice has access tothe transmission medium at any time. B. a medium access control technique for ... switching is used to dynamically changethechannel assignments D. All of theabove E. None of the above

Last Answer : a form of TDMA in which circuit switching is used to dynamically changethechannel assignments

Description : The performance of data communications network depends on .............. A) Number of users B) The hardware and software C) The transmission D) All of the above

Last Answer : D) All of the above

Description : What is the main function of Session layer in OSI model? a. Defines how data is formatted between the devices b. Made physical connection between server and client c. Both a and b d. None of the above

Last Answer : a. Defines how data is formatted between the devices

Description : A pure ALOHA Network transmit 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) 0.586

Last Answer : (B) 0.184

Description : Which of the following communications lines is best suited to interactive processing applications? a. narrow band channel b. simplex lines c. full duplex lines d. mixed band channels

Last Answer : full duplex lines

Description : A communications device that combines transmissions from several I/O devices into one line is a a. concentrator b. modifier c. multiplexer d. full-duplex line

Last Answer : multiplexer