FOA CFOT CERTIFICATION EXAM V11 QUESTIONS
AND ANSWERS
A fiber optic inspection microscope can increase the danger of high powered light
sources by focusing the light coming out of a fiber into your eye. True or False? -
Answers- True
A fiber optic power meter measures absolute power in dBM (dB referenced to 1 mw)
and, when used with a light source, can measure insertion loss expressed in dB. True or
False? - Answers- True
When we say 62.5/125 fiber, what does "62.5" mean? - Answers- core size, the
diameter in microns
When we say 50/125 fiber, what does "125" mean? - Answers- cladding size, the
diameter in microns
OM3 and OM4 multimode fiber with a 50/125 micron core are now a popular option in
premises cabling systems because they _____. - Answers- Are "laser optimized" which
gives more distance capability with gigabit networks using laser sources
In-multimode fiber, the attenuation (reduction in optical power) of the fiber is _____ at
850 nm than at 1300 nm. - Answers- Higher
According to the references, hybrid cables are cables that contain ____. - Answers-
Both singelmode and multimode optical fibers
What type of fiber cable design allows for large numbers of fibers with ultra-high density,
small size (diameter) and lower cost? - Answers- ribbon
According to the references, composite cables refer to cables that contain ____> -
Answers- both optical fibers and copper conductors
Which optical fiber cables must be grounded? - Answers- all cables that contain
metallic elements
Fiber optic cable for use inside a building must _______. - Answers- Be rated to meet
the requirements of local building and fire codes
Optical fiber cable with a orange colored jacket generally indicates the cable contains
_____. - Answers- Multimode fiber
Premises cable jackets are usually color-coded in what color to indicate singlemode
fiber? - Answers- Yellow
, Premises cable jackets are usually color-coded in what color to indicate laser-optimized
50/125 OM3 or OM4 fiber? - Answers- Aqua
When pulling long lengths of cable in conduit or innerduct, you may need to ____. -
Answers- Any or all of these as appropriate (Pull form the center to the ends, Use a
breakaway swivel or monitor tension, Lubricate the cable)
In a loose tube cable, a gel or absorbent tape or powder is normally used _____. -
Answers- To prevent water from entering the cable
Which type of cable is best suited for indoor installation when fibers ar to be directly
terminated inside a patch panel with adhesive/polish or prepolished splice connectors? -
Answers- tight buffer distribution cable
What type of cable may require installation of a breakout kit (also called a furcation or
fan out kit) for termination? - Answers- loose tube (loose buffer) cable
Which of the following represents a singlemode (smaller core size) fiber size? -
Answers- 9/125 micron
Singlemode fiber has _____ bandwidth than multimode fiber. - Answers- greater
Most plastic optical fibers are _____. - Answers- large core step-index
When you strip singlemode or graded index multimode mode glass fiber, you are
removing the ____. - Answers- Primary buffer coating
The proper method of pulling optical fiber cables is to attach the pull wire or tape to the
____ of the cable. - Answers- Strength members
When pulling cables, the minimum bend radius under tension is generally specified as
______. - Answers- 20 times the cable diameter
Cable ties used on fiber optic cables ____. - Answers- Can harm cables if too tight, so
they should be hand-tightened.
Fiber optic joints (connectors or splices) should have ____. - Answers- low loss,
minimal reflectance and high mechanical strength
To reduce _____ as well as loss, the end of a connector ferrule is polished to a PC
(physical contact) finish. - Answers- Reflectance
Factory terminations, such as used for making patchcords, generally use what method
of attaching the connector? - Answers- Epoxy/polish
AND ANSWERS
A fiber optic inspection microscope can increase the danger of high powered light
sources by focusing the light coming out of a fiber into your eye. True or False? -
Answers- True
A fiber optic power meter measures absolute power in dBM (dB referenced to 1 mw)
and, when used with a light source, can measure insertion loss expressed in dB. True or
False? - Answers- True
When we say 62.5/125 fiber, what does "62.5" mean? - Answers- core size, the
diameter in microns
When we say 50/125 fiber, what does "125" mean? - Answers- cladding size, the
diameter in microns
OM3 and OM4 multimode fiber with a 50/125 micron core are now a popular option in
premises cabling systems because they _____. - Answers- Are "laser optimized" which
gives more distance capability with gigabit networks using laser sources
In-multimode fiber, the attenuation (reduction in optical power) of the fiber is _____ at
850 nm than at 1300 nm. - Answers- Higher
According to the references, hybrid cables are cables that contain ____. - Answers-
Both singelmode and multimode optical fibers
What type of fiber cable design allows for large numbers of fibers with ultra-high density,
small size (diameter) and lower cost? - Answers- ribbon
According to the references, composite cables refer to cables that contain ____> -
Answers- both optical fibers and copper conductors
Which optical fiber cables must be grounded? - Answers- all cables that contain
metallic elements
Fiber optic cable for use inside a building must _______. - Answers- Be rated to meet
the requirements of local building and fire codes
Optical fiber cable with a orange colored jacket generally indicates the cable contains
_____. - Answers- Multimode fiber
Premises cable jackets are usually color-coded in what color to indicate singlemode
fiber? - Answers- Yellow
, Premises cable jackets are usually color-coded in what color to indicate laser-optimized
50/125 OM3 or OM4 fiber? - Answers- Aqua
When pulling long lengths of cable in conduit or innerduct, you may need to ____. -
Answers- Any or all of these as appropriate (Pull form the center to the ends, Use a
breakaway swivel or monitor tension, Lubricate the cable)
In a loose tube cable, a gel or absorbent tape or powder is normally used _____. -
Answers- To prevent water from entering the cable
Which type of cable is best suited for indoor installation when fibers ar to be directly
terminated inside a patch panel with adhesive/polish or prepolished splice connectors? -
Answers- tight buffer distribution cable
What type of cable may require installation of a breakout kit (also called a furcation or
fan out kit) for termination? - Answers- loose tube (loose buffer) cable
Which of the following represents a singlemode (smaller core size) fiber size? -
Answers- 9/125 micron
Singlemode fiber has _____ bandwidth than multimode fiber. - Answers- greater
Most plastic optical fibers are _____. - Answers- large core step-index
When you strip singlemode or graded index multimode mode glass fiber, you are
removing the ____. - Answers- Primary buffer coating
The proper method of pulling optical fiber cables is to attach the pull wire or tape to the
____ of the cable. - Answers- Strength members
When pulling cables, the minimum bend radius under tension is generally specified as
______. - Answers- 20 times the cable diameter
Cable ties used on fiber optic cables ____. - Answers- Can harm cables if too tight, so
they should be hand-tightened.
Fiber optic joints (connectors or splices) should have ____. - Answers- low loss,
minimal reflectance and high mechanical strength
To reduce _____ as well as loss, the end of a connector ferrule is polished to a PC
(physical contact) finish. - Answers- Reflectance
Factory terminations, such as used for making patchcords, generally use what method
of attaching the connector? - Answers- Epoxy/polish
