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ETA Fiber practice questions
Light is electromagnetic energy with ____ frequency and a ______ shorter wavelength
- Answer-Higher then shorter fiber optics transmission takes place in _____ portion of the light spectrum - Answer- IR A simple fiber optic System consist of what 4 parts - Answer-Transmitter, fiber optic cable, receiver, connecters What absolute power is Dbm referenced to - Answer-1 milliwatt Absolute power in optical fiber is specified as - Answer-Dbm Attenuation in optical fiber is lowest at what wavelength - Answer- What are the three most common wavelength windows used for communication thru optical fibers - Answer-1550, 850, 1300 In North America what year was the first fiber optic telephone system installed - Answer- Single-mode fiber optic systems typically use what light source - Answer-Laser diode
Multimode Fiber optic transmitters typically use what two low cost light sources - Answer-Led, VCSEL The typical numerical aperture for 50/125 I'm optical fiber is - Answer-. One way to reduce modal dispersion is to - Answer-Use a smaller core The number of modes in an optical fiber increases as the _____ decreases - Answer- Wavelength What optical effect is produced by all mechanical interconnections whether mechanical splices or mated connected pairs - Answer-Fresnel Reflections When light passes from one transparent medium to anther transparent medium that has a different refractive index the light wave bends this is called? - Answer- Refraction What part of the multimode optical fiber has the lowest refraction index - Answer- Cladding Single-mode fiber has a _____ core compared to multimode fiber - Answer-Smaller Single mode systems usually operate at what three wavelengths - Answer-1625, 1550, 1310 What are the two most common multimode wavelengths - Answer-859, 1300 Attenuation (loss) is specified as - Answer-DB
Which component of the connector is the optical fibers cladding typically bonded to during the assembly process? - Answer-Ferrel The NEC defines a fiber optic cable that is fire retardant and low smoke as a _____ rated cable - Answer-Plenum What is the color of commercial (non military) multimode cordage - Answer-Orange The gel/tape/powder in a loose tube/buffered fiber cable protects the optical fiber from ______ should the sheath or jacket fail - Answer-Water What does OFNR stand for - Answer-Optical fiber non conductive riser The NEC considers fiber optic cables which contain non-current carrying conductive members such as metal strength member, metallic vapor barriers, amor or sheath to be _______ cables - Answer-Conductive What type of cable defined by the NEC contains both optical fibers and current carrying electrical conductors within the same jacket - Answer-Composite What is the name of the indoor tight-buffered "non-breakout" style cable - Answer- Distribution All connections should be ______ prior to testing - Answer-Cleaned Precision fiber connector ferrules are mostly made out of what materials - Answer- Ceramic What pattern of polishing is generally used with a hand polishing technique to minimize surfaces scratches? - Answer-Figure 8
An MPO connector is a recognized connector in the ANSI/TIA-568-C.3 standard true or false - Answer-True An SC connector is a recognized connector in the ANSI/TIA-586-C.3 standard true or false - Answer-True What safety forms must be available when chemicals are used - Answer-MSDS What is the best way to dispose of water fiber ends - Answer-Sealable container properly labeled with "fiber optic waste" The loss resulting from mates fiber ends that are not perpendicular to the fibers axis and are not lined up with one another due to poor cleave angle is an example of _______ loss - Answer-Extrinsic Most small form factor connectors use this diameter ferrule - Answer-1.25 mm The NEC is updated every _____ years - Answer- If the cable has a metallic members what does the NEC require at termination points - Answer-Bonding/ ground points What kind of cable kit branches the fibers contained in a loose tube fiber optic into 900 micron outside diameter protective tubes? - Answer-Fan out kits Most single mode fiber ends are terminated onto factory made _____ and spliced to the fiber cable - Answer-Pig tails
What class of laser has the lowest power and the fewest hazards associated with it - Answer-Class 1 When visually inspecting the end face of a connector with an inspection microscope where are the minor defects allowed - Answer-Outter-cladding If you have a cross section of a fiber optic cable where is the cladding - Answer- Middle What is the acronym for laser - Answer-Light amplification stimulated edmissions of radiation What does OFCR mean - Answer-Optical fiber conductive riser What are 3 fiber fabrications to making a preform - Answer-Mcvd OVD VAD What is the diameter of the acrylate coating - Answer-250 microns There are three types of dispersion what are they - Answer-Modal chromatic waveguide What component of an optical power meter converts light into electrical energy - Answer-Photodiode What is the purpose of cladding? - Answer-To insure total internal reflection Which class of lasers has the highest power and is used for surgery, research, drilling, cutting, welding, and micro machining - Answer-Class 4
Name three advantages of fiber optics vs copper cable - Answer-Security, light weight, small size What does ETA stand for - Answer-Electricians technicians association Name 3 ways fiber optics is used today - Answer-Medical, Communications, military Electrodes in a fusion splicer become rounded or corroded when worn and should be replaced when the arc count reaches ____ or at the interval recommended by manufacture - Answer-1, What is the ferrule diameter for ST or SC connector - Answer-2.5 mm What is the first event on an OTDR trace - Answer-Dead zone What has more bandwidth single mode or multi mode - Answer-Single mode What does VFL stand for - Answer-Visual fault locator What is the correct term for the sandpaper used to polish the end face of connectors - Answer-Lapping film or polish film What is the purpose of the Kevlar in the jacketing of optical fiber - Answer-Strength and protection What is used inside mechanical spices and pre-polished connectors to reduce loss from back reflections - Answer-Index matching gel
A microscope will not confirm fiber continuity over short distances true or false - Answer-True What instrument is used for testing a fiber spends and includes loss per kilometer and total distance of span measurement - Answer-Optical time domain reflectometer Installers must consider what when installing fiber optic cable - Answer-Building codes
