Description : What are the two types of electrical communications?
Last Answer : Radio and wire.
Description : In swept-frequency testing the impedance of a transmission line, what electrical characteristic is actually being measured?
Last Answer : Swr on the transmission line.
Description : What are the two limitations to an active satellite communications system?
Last Answer : Satellite down-link transmitter power and up-link receiver sensitivity.
Description : What four switched networks are part of the defense communications system?
Last Answer : AUTOVON, AUTOSEVOCOM, AUTODIN, and DSSCS.
Description : The naval communications system is made up of what two groups of communications?
Last Answer : Strategic and tactical.
Description : What are the three fundamental requirements of a military communications system?
Last Answer : Reliability, security, and speed.
Description : RS-232, RS-449, RS-530, V, 24 and X.21 are examples of ____________. A. standards for interfaces between modems and transmission facilities B. standards for various types of ... for interfaces between terminals and modems D. standards for end to end performance of data communications system
Last Answer : C. standards for interfaces between terminals and modems
Description : The information tobe communicated ina data communications system is the_______. A) Medium B) Protocol C) Message D) Transmission
Last Answer : Message
Description : Why is detector saturation not generally a problem in fiber optic communications systems?
Last Answer : Because fiber optic communications systems operate at low optical power levels.
Description : What was the major operational limitation of early communications satellites?
Last Answer : The lack of suitable power sources.
Description : A typical satellite communications operational link consists of a satellite and what two other components?
Last Answer : Earth terminals.
Description : What are the two types of communications satellites?
Last Answer : Passive and active.
Description : What are the five most prominent communications modes of operation?
Last Answer : Simplex, half-duplex, semiduplex, duplex, and broadcast.
Description : What are the disadvantages of radiotelephone communications?
Last Answer : Static, enemy interference or a high local noise level.
Description : Why is radiotelephone one of the most useful methods of military communications?
Last Answer : It is direct, convenient and easy to use.
Description : What is the main advantage of radiotelegraph communications?
Last Answer : Reliability.
Description : What are the four general types of communications services in the hf band?
Last Answer : Point-to-point, ship-to-shore, ground-to-air, and fleet broadcast.
Description : What type of modulation do most analog fiber optic communications systems use?
Last Answer : Intensity modulation.
Description : What organization has published safety guidelines for the maximum limits of RF energy near the human body? A. The American National Standards Institute (ANSI). B. The Environmental Protection ... Communications Commission (FCC). D. The Institute Of Electrical and Electronics Engineers (IEEE).
Last Answer : A. The American National Standards Institute (ANSI).
Description : In telecommunications when we call data communications it means the transmission of________. A. Voice and video B. Voice C. Video D. Computer data
Last Answer : D. Computer data
Description : Which of the following is not a common microwave application? A. Radar B. Data transmission C. Space communications D. Mobile radio
Last Answer : D. Mobile radio
Description : Rules governing the transmission of digital information. A. Line protocol B. Isochronous C. Data communications D. Digital communications
Last Answer : B. Isochronous
Description : Which of the following is required to communicate between two computers? a. communications software b. protocol c. communication hardware d. all of above including access to transmission medium
Last Answer : all of above including access to transmission medium
Description : Which of the following is required to communicatebetween two computers? A. communications software B. protocol C. communicationshardware D. access to transmission medium E. All of theabov
Last Answer : All of theabov
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 : Readability 2 means that your transmission is: a. Readable but with difficulty b. Readable c. Readable now and then d. Two way communications have been established
Last Answer : c. Readable now and then
Description : Did any one know Journal of Computer and Communications They told me in the invitation letter that they have published over 900 articles since 2013. But I still want to make sure?
Last Answer : I published an article in the Journal of Computer and Communications 2 years ago, and I still feel very reliable now. They have published more than 1,000 articles since 2013, and they are ... published within 2 months. The journal is published so quickly and the editors are also very professional.
Description : A form of telecommunication for the transmission of transient images of fixed or moving objects. A. E-mail B. Television C. Radio D. Internet
Last Answer : B. Television
Description : What is the advantage of single-sideband (ssb) transmission over AM transmission?
Last Answer : The same amount of intelligence can be transmitted with one sixth of the output power with less than one-half the bandwidth.
Description : List seven advantages of fiber optics over electrical systems.
Last Answer : Advantages of fiber optics are improved system performance, immunity to electrical noise, signal security, electrical isolation, reduced size and w
Description : The physical layer provides __________ a. mechanical specifications of electrical connectors and cables b. electrical specification of transmission line signal level c. specification for IR over optical fiber d. all of the mentioned
Last Answer : d. all of the mentioned
Description : The physical layer provides __________ A. mechanical specifications of electrical connectors and cables B. electrical specification of transmission line signal level C. specification for IR over optical fiber D. all of the mentioned
Last Answer : D. all of the mentioned
Description : What specifications does physical layer provides __________. A. mechanical specifications of electrical connectors and cables B. electrical specification of transmission line signal level C. specification for IR over optical fiber D. all of the mentioned
Description : The physical layer provides __________ a) mechanical specifications of electrical connectors and cables b) electrical specification of transmission line signal level c) specification for IR over optical fiber d) all of the mentioned
Last Answer : d) all of the mentioned
Description : What two components make up a simple synchro transmission system?
Last Answer : A synchro transmitter and a synchro receiver.
Description : What type of electrical diagram is used to identify the components of a system?
Last Answer : A pictorial diagram.
Description : Who is responsible for meeting environmental and electrical requirements of a system?
Last Answer : Equipment designers (planners).
Description : . What is the primary advantage of an fsk transmission system?
Last Answer : Resistance to noise interference.
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 : What type of flux must be used in all electrical and electronic soldering?
Last Answer : Noncorrosive, nonconductive rosin fluxes.
Description : What is the tin-lead alloy percentage of solder used for electrical connectors, splices, and terminal lugs?
Last Answer : 60-percent tin and 40-percent lead (60/40 solder).
Description : . Why are coaxial lines more efficient at microwave frequencies than two-wire transmission lines?
Last Answer : The electromagnetic fields are completely confined
Description : When working on electrical equipment, why should you use only one hand?
Last Answer : . To minimize the probability of providing a path for current through your body.
Description : Before working on electrical equipment containing capacitors, what should you do to the capacitors?
Last Answer : Discharge them by shorting them to ground.
Description : Which quantity (voltage or current) determines the intensity of an electrical shock?
Last Answer : Current.
Description : What restrictions are placed on the use of the electrical lock method?
Last Answer : It can be used only if the leads of the synchro are accessible and the rotor is free to turn.
Description : What is the output voltage of a CT when it is set on electrical zero?
Last Answer : Zero or minimum voltage.