Test
COMMTECH 5 EVALUATION
Crea una cuenta gratis para terminar este test
Guarda tu progreso y consulta tu resultado final.
¿Ya tienes cuenta? Inicia sesión
Preguntas del test (50)
1The third fiber in a bundle is usually
- Aslate
- Bgreen
- Cbrown
- Daqua
2When splicing fibers from a fiber break
- Athe blue fiber in every bundle should be spliced first
- Bthe fibers should be spliced in order
- Cthe fiber documents should be used to determine which fiber is spliced first
- Dthe fibers should be spliced in reverse order
30.9 volts DC at a fiber optic node is
- Aless than 1dBmV.
- Bmore than 1dBmV
- C0 dBm V.
- Dmore than the recommended receive level
4Optimum optical receive power level at a fiber node is generally
- Abetween -2 and +2 volts
- Bdependent upon system specifications
- Ccannot be determined due the difference in systems
- Dbetween -2 dBm and +2dBm
5A fiber system utilizing 1550 nanometers has less loss than one employing 1310 because
- A1550 nm has no longer wavelength
- B1310 nm is a high loss, low noise wavelength
- Cof the makeup of the glass (fiber)
- Dof the skin effect
6A fiber optic device that generates a concentrated beam of light ( laser light) and sends it into the fiber is called a
- Apre-term shelf
- Breturn receiver
- Coptical Transmitter
- Dfusion splicer
7An optical node is a device that can
- Apass AC and DC voltages
- Breceive and convert on optical signal into RF signals that are amplified and supplied to coaxial cable
- Creceive and split RF signals into multiple outputs
- Dreceive optical signals and inject signals compensating for signals clipped be the laser in the headend
8An optical coupler
- Apassive device used to split or combine an optical signal
- Bactive device used to amplify and split an optical signal
- Cconnection between two strands of fiber created by the use of epoxy or a fixture applied at the juncture
- Dpassive device used to attenuate an optical signal
9If you were splicing a 24-count fiber using the U.S. coloring scheme, how many different colors would be in that fiber?
- A6
- B12
- C16
- D24
10Which one of the following is NOT a fiber component
- Aglass core
- Bglass cladding
- Cenamel finish
- Dacrylic coating
11Which of the following PPE is always required while splicing fiber optic cable?
- ASafety glasses
- BSteel-toe boots
- CAcid resistant apron
- DHigh voltage gloves
12What is the typical fiber loss per kilometer at 1310 nm?
- A.25 dB
- B.35 dB
- C.45 dB
- D.55 dB
13If you were working on a fiber run that was 7.28 km in length from the headend to the node what would the light loss at 1310nm just for the fiber?
- A25.5 dB
- B0.255dB
- C2.55 dB
- D0.025 dB
14Fiber backbone topology
- Aincrease reliability by increasing the total number of active devices between the customer and the headend
- Bimproves CATV network operating performance
- Cdecreases carrier-to noise and other distortion parameters
- Dis a ring topology capable of supporting a variety of transmission proitocal
15A _______________ splice is a bad optical fusion splice cause by the optical fiber ends being held too close together during fusing
- ABulge
- BNecked-down
- CMatch stick
- DSeed or inclusion
16Compared to conventional coaxial cable optical fiber cable
- Ais much more rugged
- Bruns are much shorter than traditional coaxial cable runs
- Cis heavier
- Dhas the same make-ready considerations
17Most optical fiber cable have a ________________ or greater maximum pulling strength
- A1000 pound
- B600 pound
- C400 pound
- D200 pound
18Fiber optic splice loss
- Ais recorded at each splice location
- Bmust be measure with an OTDR from the headend
- Ccan only be measured with a local injection/detection system
- Dis recorded only for mechanical splices
19The insertion loss test
- Ameasure the total amount of signal loss at the optical receiver location
- Brequires three jumpers with unknown connector lasses
- Csetup consists of optical transmitter, optical receiver, optical coupler and the fiber link under test
- Drequired an RF input signal source, the optical transmitter, test jumper and the optical power meter
20As light passes through two materials having different indexes of refraction the small portion of reflected light is called a
- Afiber signature
- Bincident light
- CFresnel reflection
- Dcore imperfection
21When measuring end-to-end optical fiber attenuation with an optical power meter
- Aalways connect the optical fiber under test directly to the optical power meter and the laser light source
- Bthe optical power meter must be correctly set up and transmitting in any mode for accurate transmission
- Cperform the test in accordance with standard EIA-455-171-1987
- Dalways use a headend optical transmitter
22Optical power meter
- Alaunch a stabilize light source of known power and wavelength onto an optical fiber system
- Bhave a photodiode that receives light from a light source and converts it to a low level electrical signal
- Ctypically have a durable aluminum housing and case for carrying and storage protection
- Dhave only electrical and environmental specification
23Which of the following statement is true
- AA splitter can be used as a combiner
- Bthe isolation between the two output ports is the same as the loss between the input and the output port
- CA splitter loss is normally 6 dB
- Dall of the above
24Dense wave Division Multiplexing (DWDM):
- AMultiplexes all channels into one optical wavelength
- BCan transmit the same amount of information as up to eight equivalent conventional fibers on a single fiber
- Ccombines 1310 nm. 850 nm, and 1550 nm onto one fiber
- Dcombine numerous sign wave signal onto a single quadrature amplitude modulated carrier
25What is the most commonly used quadrature amplitude modulation?
- A16 QUAM
- B8 QUAM
- C64 QUAM
- D256 QUAM
26What does OTDR stands for
- AOptical Time Duration Reflector
- BOld Time Dance Routine
- COptical Time Domain Reflectometer
- Doptical Trans Domain Reflection
27Which of the following are type(s) of optical splices?
- AMechanical
- BOptical
- CFusion
- DA and C
28What is the process that allows fiber amplifiers to work?
- AEmitted stimulants
- BOver stimulated
- CStimulated emissions
- DAbsolute recovery
29________________ splices are usually used for temporary restoration of a damaged fiber optic cable
- AStraight
- BFusion
- CMechanical
- DOptical
30How do you over come the effect of the OTDR dead zone
- AUse a launch jumper
- BUse a coaxial jumper
- CMove the OTDR closer to the damage area
- DUse a power meter instead
31Which of the following measurements CANNOT be made with a signal level meter ?
- ACarrier-to noise ratio
- BCSO
- CHum modulation
- DVideo and audio carrier levels
32 foots the minimum video carrier level, required by the FCC, at the end of a 98.42-foot (30-meter) drop connected to a tap port?
- A0 - 10 dBm V
- B3.0 dBm V
- C0 dBm V
- D6 dBm V
33What is the FCC requirement for the level of the audio carrier ?
- A12 dB below the associated video carrier level
- BNo more than -+3dB from the adjacent audio carrier
- CBetween 10 dB and 17 dB below the associated video carrier level
- DAt least 12 dB above the noise floor
34During the measurement procedure for carrier-to-noise, the carrier must be :
- AModulated
- BUnscrambled
- CUnmodulated
- DProcessed
35Reverse spectrum frequency allocation is between:
- A5 MHz - 30 MHz
- B10 MHz - 42 MHz
- C5 MHz - 42 MHz
- D5 MHz - 50 MHz
36The core of a typical single mode fiber has a diameter of
- A50 - 60 nm
- B20 -25 nm
- C5 - 10 nm
- D12 -25 nm
37Visible light falls in which wavelength range ?
- A750 - 1600 nm
- B100 400 nm
- C1310 - 1550 nm
- D400 -750 nm
38As light frequency increase the attenuation in a fiber optic cable tends to
- ARemain the same
- BIncrease
- CDecrease
- DDouble
39The phenomenon that causes light to spread as it travels through a fiber optic cable is known as
- AAttenuation
- BDispersion
- CMode field diameter
- DScattering
40Which wavelength has the lowest attenuation characteristics?
- A1300 nm
- B850 nm
- C1550 nm
- D750 nm
41The typical number of fibers in a buffer tube is
- A6
- B10
- C8
- D12
42A DFB (Distributive Feed Back) laser is rated by ANSI as a
- AClass 1 laser
- BClass 2/2 laser
- CClass 3A laser
- DClass 3B laser
43Which of the following is not a consideration when determining the total path loss of a fiber optic network?
- AAverage splice losses
- BFiber attenuation (by distance)
- CTransmitter output power
- DLosses caused by connectors, patch panels, etc.
44A network architecture where nodes, hubs or headends may be connected with fiber optic cables to provide redundancy and increase services is known as
- AStar
- BBuss
- CRing
- DSONET
45According to FCC regulation 76.605 (a) (2), the aural carrier frequency must be separated from the video carrier frequency by
- A4.5 MHz +/- 5 KHz
- B4.25 MHz +/- 25 KHz
- C4.75 MHz +/- 25 MHz
- D5.00 MHz +/- .5 MHz
46Which network component converts 1550 nm optical signals to 1300 nm optical signals for distribution to the nodes?
- AHeadends
- BHub
- COTN
- DFP laser
47What should the hazardous communication plan provide for prior to the use of any chemical ?
- APaperwork
- BTraining
- CProtection
- DReview
48When passing or changing lanes, what should you do to check the traffic coming up behind you ?
- ACheck your rearview mirror, do a 45 degree scan using your side view mirrors, then do a 90 degree head check
- BCheck your mirrors several times to make sure no one is in your blind spot
- CUse a 45 degree eye scan along with your rear and side view mirrors
- DCheck both your rearview and side view mirrors, then turn your head 90 degrees to look over your shoulder
49To find out what problems a customer is having with their cable service, you should
- AUse probes to find out what the customer has experienced with their cable service
- BLimit conversation and take a look at the connection outside of their home
- CTell the customer to show you the TV and you'll figure out what they need
- DComplain that the CAE didn't get enough information for the work order while speaking to the customer on the phone
50Customer service starts with:
- AA work order
- BA positive attitude
- CA vehicle and tools
- DA company uniform
Información
- Descripción
- Test sobre COMMTECH 5 EVALUATION , creado por Latoya Chambers el 07/01/2017.
- Autor
- Latoya Chambers
- Idioma
- English
- Visitas
- 6
- Valoración
- Aún sin valoraciones Valora este test