Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Ground loop (electricity) wikipedia , lookup
Skin effect wikipedia , lookup
Power over Ethernet wikipedia , lookup
Loading coil wikipedia , lookup
Electrical connector wikipedia , lookup
Telecommunications engineering wikipedia , lookup
Home wiring wikipedia , lookup
1 What is the bandwidth of category-4 wire? 10 MHz 12 MHz 15 MHz 20 MHz 2 What is the meaning of the acronym AWG? American Wire Gauge American Workman Gauge Allied Wire Gauge Allied Workman Gauge 3 Why are some outside plant cables filled with anti-hygroscopic gel? to reduce strain on the wires inside to provide UV protection to prevent water from entering the cable to reduce EMI from power lines 4 In most business LANs, which connector is used with twisted-pair networking cable? BNC RJ-11 RJ-45 Type F 5 Which statement is true of stranded copper wire? It is composed of a single copper core. It is the preferred wire to be used with IDCs. It is more flexible than solid wire. It should not be used in a patch panel. 6 What is the meaning of the acronym ANSI? American National Structure Institute Allied National Standards Institute Allied National Structure Institute American National Standards Institute 7 Which color is pair 2 in twisted-pair cabling? green orange blue brown 8 Which term denotes the solid color wire in a pair? tip UTP ring ScTP 9 Why is analog video one of the most demanding types of signals? must be transmitted over fiber optic cables limited to two voltage levels must be transmitted at very high data rates covers a wide range of frequencies 10 Which connectors are used with coaxial cable? (Select two.) BNC RJ-11 RJ-45 Type F 11 Which type of cable insulation can be used in high temperature applications? rubber elastomers flouropolymers thermoplastics 12 What is the primary use for Category 4 cable? thicknet thinnet Ethernet Token Ring 13 What is bonding? splicing two wires together interconnecting grounded equipment attaching cables to terminators joining two network segments 14 What does the current Anixter XP system of cable rating include beyond the EIA/TIA standards? higher twists per cable stress testing thermal conductivity live data testing 15 What is the meaning of the acronym UL? Under Laboratories Universal Laboratories Underwriters Laboratories United Laboratories 16 Which of the following are broadband technologies? (Select two.) cable TV 10baseT DSL Ethernet 17 What is the term used to include all the wiring in a building? cable plant structured network wiring composite cabling network infrastructure 18 Which color is the binder group that holds pair 174? red-green red-orange black-green white-brown 19 What does the "e" stand for in Category 5e cable? electrical extended enhanced extrapolated 20 Which property of copper gives it the ability to be drawn into a wire? conductivity ductility corrosion resistance tensile strength 21 How does UTP cabling limit signal degradation caused by EMI? The foil shield blocks EMI. Cancellation is the only means of protection. The insulation is EMI resistant. UTP is not affected by EMI. 22 Which term describes the process of pushing melted copper through a die? extrusion drawing insulation smelting 23 Which wire is still being installed for telephones today? Category 3 Category 1 Category 2 Category 4 24 Which color is pair 23 in a 25 pair cable? red blue white slate violet green yellow green 25 Which device connects a balanced circuit to an unbalanced circuit? repeater multiplexer balun modem 26 What can reduce crosstalk? regenerate the signal at the far end change the twist ratio from pair to pair protect the cable from moisture and grease keep all pairs as close as possible 27 Which common elements do most copper cables contain? (Select two.) insulation cladding kevlar sheath 28 How many twisted pairs are in Category 6 cable? 4 8 10 12 29 Why is 900 pair rarely exceeded when running cable between buildings? too much cable weight too much space required for surge-protecting devices will not meet Code requirements too much crosstalk 30 What is the description for the acronym NEC? New Electrical Code National Electrical Code National Electrical Commission National Electrical Committee 31 What is the most common connector used with coaxial cable? BNC vampire tap RJ-45 RJ-11 32 What is the major difference between Category 5e and Category 5 cable? shielding more wires more twists per foot different gauge of wire 33 In radio, what is the typical impedance of coaxial cable in Ohms? 37 50 75 93 150 34 When running cable through a firewall, what is the purpose of fire-stopping? stops drafts stops smoke restores the appearance of the firewall restores the integrity of the firewall