FIBER OPTIC CLASS CFOS/T CERTIFICATION EXAM QUESTIONS
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
Before a fiber is installed it is often checked for ______.
continuity
What is the difference between a visual fault locator (VFL) and a visual fiber tracer
(VFT)?
the amount of optical power coupled into the fiber
What instrument detects poor splices or cable breaks in short lengths of fiber?
the visual fault locator (VFL)
what finds faults in fiber's too close for the OTDR to see?
the visual fault locator (VFL)
What detects scratches and polishing defects in connectors?
Microscope
Before viewing a connector with a microscope you should ____________.
make sure there is no power present. (no light coming through)
Where are scratches or defects on a connector end considered a problem?
Anywhere on the core
What happens if you use a microscope with excessively high magnification?
Small scratches and defects appear worse than they truly are
When viewing a connector with a microscope, which method allows for the best
inspection for scratches?
, at an angle, with lighting at an angle
What instrument detects a 2 kHz tone?
a fiber identifier
What is 0 dBm?
1 mw (milliwatt)
What is the m in dBm represent?
reference to milliwatt
a loss of 20 dB means power is less than by how many times?
100
a loss of 3 dB means power is less by what ________%?
50%
Of the following 4 which of these has the highest power?
-20 dBm, -30 dBm,10mw, or 100mw
100 mw
What does not affect loss readings?
meter calibration wavelength
What is the most basic measurement parameter in fiber and is required for almost
all fiber optic tests?
optical power
Why do power meters measure in dB?
measures the loss directly
What is optional on a power meter?
its the display readout resolution (ex. .1, .01)
AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
Before a fiber is installed it is often checked for ______.
continuity
What is the difference between a visual fault locator (VFL) and a visual fiber tracer
(VFT)?
the amount of optical power coupled into the fiber
What instrument detects poor splices or cable breaks in short lengths of fiber?
the visual fault locator (VFL)
what finds faults in fiber's too close for the OTDR to see?
the visual fault locator (VFL)
What detects scratches and polishing defects in connectors?
Microscope
Before viewing a connector with a microscope you should ____________.
make sure there is no power present. (no light coming through)
Where are scratches or defects on a connector end considered a problem?
Anywhere on the core
What happens if you use a microscope with excessively high magnification?
Small scratches and defects appear worse than they truly are
When viewing a connector with a microscope, which method allows for the best
inspection for scratches?
, at an angle, with lighting at an angle
What instrument detects a 2 kHz tone?
a fiber identifier
What is 0 dBm?
1 mw (milliwatt)
What is the m in dBm represent?
reference to milliwatt
a loss of 20 dB means power is less than by how many times?
100
a loss of 3 dB means power is less by what ________%?
50%
Of the following 4 which of these has the highest power?
-20 dBm, -30 dBm,10mw, or 100mw
100 mw
What does not affect loss readings?
meter calibration wavelength
What is the most basic measurement parameter in fiber and is required for almost
all fiber optic tests?
optical power
Why do power meters measure in dB?
measures the loss directly
What is optional on a power meter?
its the display readout resolution (ex. .1, .01)
