ETA Fiber practice questions and answers latest 2022/2023(Actual questions for the test)
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ETA Fiber
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ETA Fiber
ETA Fiber practice questions and answers latest 2022/2023(Actual questions for the test)
Light is electromagnetic energy with ____ frequency and a ______ shorter wavelength
Higher then shorter
fiber optics transmission takes place in _____ portion of the light spectrum
IR
A simple fiber op...
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ETA Fiber practice questions and answers latest
2022/2023(Actual questions for the test)
Light is electromagnetic energy with ____ frequency and a ______ shorter wavelength
Higher then shorter
fiber optics transmission takes place in _____ portion of the light spectrum
IR
A simple fiber optic System consist of what 4 parts
Transmitter, fiber optic cable, receiver, connecters
What absolute power is Dbm referenced to
1 milliwatt
Absolute power in optical fiber is specified as
Dbm
Attenuation in optical fiber is lowest at what wavelength
1550
What are the three most common wavelength windows used for communication thru
optical fibers
1550, 850, 1300
In North America what year was the first fiber optic telephone system installed
1977
Single-mode fiber optic systems typically use what light source
Laser diode
Multimode Fiber optic transmitters typically use what two low cost light sources
Led, VCSEL
The typical numerical aperture for 50/125 I'm optical fiber is
.200
One way to reduce modal dispersion is to
Use a smaller core
The number of modes in an optical fiber increases as the _____ decreases
Wavelength
What optical effect is produced by all mechanical interconnections whether mechanical
splices or mated connected pairs
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 ?
Refraction
What part of the multimode optical fiber has the lowest refraction index
Cladding
Single-mode fiber has a _____ core compared to multimode fiber
Smaller
Single mode systems usually operate at what three wavelengths
1625, 1550, 1310
What are the two most common multimode wavelengths
859, 1300
, Attenuation (loss) is specified as
DB
What is a "mode" in optical fiber
A light path
Improper bending of optical fiber will do what to tensile strength
Decrease
OM3 and OM4 multimode fibers are commonly known as _________ fibers
Laser optimized
What are the two most common multimode optical fiber types
62.5/125 50/125
Different wavelengths of light travel at _____ speeds through glass
Different
The typical diameter for a fiber used in the tight-buffered cables is?
900 microns
In cordage what color signifies single-mode fiber?
Yellow
In ANSI/TIA-589-C twelve colors comprise the fiber color code. What are the twelve in
order ?
Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua
This fiber is designed be the ISO/IEC 11801 specification. The fibers designated as
OM1 and OM2 are generally known as ______ fibers and were designed for use with
led light sources
Legacy multimode
Graded index fiber uses numerous concentric layers of glass to reduce _____
dispersion
Modal
Which component of the connector is the optical fibers cladding typically bonded to
during the assembly process?
Ferrel
The NEC defines a fiber optic cable that is fire retardant and low smoke as a _____
rated cable
Plenum
What is the color of commercial (non military) multimode cordage
Orange
The gel/tape/powder in a loose tube/buffered fiber cable protects the optical fiber from
______ should the sheath or jacket fail
Water
What does OFNR stand for
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
Conductive
What type of cable defined by the NEC contains both optical fibers and current carrying
electrical conductors within the same jacket
Composite
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