ETA-I Study Guide (Fiber Optics Installer Certification) (FOI) Questions with Correct Answers

ETA-I Study Guide (Fiber Optics Installer
Certification) (FOI) Questions with
Correct Answers 2026-2027
An optical fiber works based off of a principle known as; - CORRECT ANSWER -
Total Internal Reflection.



The bending of light asRit passes from one transparent material into another which has a differe
nt refractive index is what? - CORRECT ANSWER -Refraction.



Light is electromagnetic radiation in the wavelength range including visible, ultraviolet, X-
rays and . - CORRECT ANSWER -Infrared.



What are the three parts of a typical optical fiber? - CORRECT ANSWER -
Core, Cladding, buffer Coating. (3 C's)



A simple fiber optic system consists of what four components? - CORRECT ANSWER -
Transmitter, receiver, fiber, and connector.



Which optical fiber is most suited for very high speed and long distance applications? -
CORRECT ANSWER -Single-mode.



The reduction of power as a signal passes through a system is called (Also known as signal loss);
- CORRECT ANSWER -Attenuation.



A fiber optic cable which has single-mode and multi-mode optical fibers is what kind of cable? -
CORRECT ANSWER -Hybrid.

, A fiber with it's core having numerous concentric layers of glass, with each layer having a lower i nd
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




ex of refraction is what kind of fiber? What is the core size and how is it identified now? -
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




CORRECT ANSWER -Multi-mode graded-index. X2 X2 X2




The spreading of light pulses as they take different paths in traveling down a fiber is known as w hat
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




? - CORRECT ANSWER -Modal Dispersion.
X2 X2 X2 X2 X2




What are the two widely used methods for installing buried fiber optic cables? -
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




CORRECT ANSWER -Trench and Plow methods.
X2 X2 X2 X2 X2 X2




What configurations should be used when the center pull or backfeeding techniques are used to pu
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




ll in cables? - CORRECT ANSWER -Figure 8's.
X2 X2 X2 X2 X2 X2 X2




During the installation of fiber optic cables, innerduct serves what two main purposes? -
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




CORRECT ANSWER -Expansion and Protection.
X2 X2 X2 X2 X2




Two basic methods used for installing lashed aerial cables are; - CORRECT ANSWER -
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




Stationary reel (pull-in) and moving reel (drive-off).
X2 X2 X2 X2 X2 X2 X2




Two manufacturer's ratings or specifications that installers must always obey during fiber optic c abl
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




e installations are; - CORRECT ANSWER -Tensile strength and bend radius.
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




What are the three main parts of a connector? - CORRECT ANSWER -Boot, body, ferrule.
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




According to the TIA/EIAR568 standards, what is the maximum insertion loss allowed for a mate d p
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




air of connectors? - CORRECT ANSWER -.75 dB.
X2 X2 X2 X2 X2 X2 X2




The connector ferrule can be made of what three materials? - CORRECT ANSWER -
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2




Ceramic, plastic, steel.
X2 X2 X2