CO Fiber Optic Installer Contractor
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A fiber optic installer is preparing to terminate a single-mode fiber
using a mechanical splice. Which characteristic of single-mode fiber
is most important to preserve when making the splice?
A. Large core diameter
B. Precise core alignment
C. High jacket thickness
D. Increased cladding diameter
B. Precise core alignment
Single-mode fiber has a very small core, so accurate alignment is
essential for minimizing insertion loss and maintaining acceptable
optical performance.
2. Which type of optical fiber is generally designed to support long-
distance telecommunications links because it has a much smaller
core and substantially lower modal dispersion than multimode
fiber?
,A. Step-index multimode fiber
B. Graded-index multimode fiber
C. Single-mode fiber
D. Plastic optical fiber
C. Single-mode fiber
Single-mode fiber transmits light primarily in one propagation mode,
greatly reducing modal dispersion and making it suitable for long-
distance, high-bandwidth communication systems.
3. When installing fiber-optic cable in a building, which practice best
protects the cable from excessive attenuation caused by physical
installation?
A. Pulling the cable as tightly as possible
B. Exceeding the manufacturer's pulling tension temporarily
C. Maintaining the manufacturer's minimum bend radius
D. Tying the cable tightly to support structures
C. Maintaining the manufacturer's minimum bend radius
Fiber optic cable can experience increased attenuation or permanent
damage when bent beyond its specified radius, so the manufacturer's
bend-radius requirements must be maintained during installation.
4. What is the primary purpose of the cladding surrounding an optical
fiber core?
A. To provide electrical grounding
B. To confine light within the core through total internal reflection
,C. To increase the cable's tensile strength
D. To provide electromagnetic shielding
B. To confine light within the core through total internal reflection
The cladding has a lower refractive index than the core and allows
optical energy to remain confined within the core through total internal
reflection.
5. Which component of a fiber-optic cable provides the primary
structural protection around the optical fibers?
A. Fiber core
B. Cladding
C. Cable jacket
D. Optical transmitter
C. Cable jacket
The outer jacket protects the cable assembly from environmental and
mechanical hazards such as abrasion, moisture, and physical contact.
6. What is the main function of a fiber-optic fusion splicer?
A. Measure cable length using electrical resistance
B. Permanently join two optical fibers by aligning and melting their ends
C. Convert optical signals into electrical signals
D. Install connectors without stripping fiber
B. Permanently join two optical fibers by aligning and melting their ends
, A fusion splicer precisely aligns fiber ends and uses an electric arc to fuse
them together, normally producing a low-loss permanent splice.
7. Which instrument is specifically used to locate faults, measure fiber
length, and identify the approximate location of reflective events
along an optical fiber?
A. Multimeter
B. OTDR
C. Clamp meter
D. Megohmmeter
B. OTDR
An optical time-domain reflectometer sends optical pulses through the
fiber and analyzes returned light to identify events, attenuation, splice
losses, connector reflections, and approximate fault locations.
8. A fiber technician measures the optical power received at the end
of a link. Which unit is normally used to express absolute optical
power?
A. dBm
B. dB/km
C. Ohms
D. Hertz
A. dBm
dBm expresses optical power relative to 1 milliwatt and is commonly
used when measuring transmitter output and receiver input levels.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A fiber optic installer is preparing to terminate a single-mode fiber
using a mechanical splice. Which characteristic of single-mode fiber
is most important to preserve when making the splice?
A. Large core diameter
B. Precise core alignment
C. High jacket thickness
D. Increased cladding diameter
B. Precise core alignment
Single-mode fiber has a very small core, so accurate alignment is
essential for minimizing insertion loss and maintaining acceptable
optical performance.
2. Which type of optical fiber is generally designed to support long-
distance telecommunications links because it has a much smaller
core and substantially lower modal dispersion than multimode
fiber?
,A. Step-index multimode fiber
B. Graded-index multimode fiber
C. Single-mode fiber
D. Plastic optical fiber
C. Single-mode fiber
Single-mode fiber transmits light primarily in one propagation mode,
greatly reducing modal dispersion and making it suitable for long-
distance, high-bandwidth communication systems.
3. When installing fiber-optic cable in a building, which practice best
protects the cable from excessive attenuation caused by physical
installation?
A. Pulling the cable as tightly as possible
B. Exceeding the manufacturer's pulling tension temporarily
C. Maintaining the manufacturer's minimum bend radius
D. Tying the cable tightly to support structures
C. Maintaining the manufacturer's minimum bend radius
Fiber optic cable can experience increased attenuation or permanent
damage when bent beyond its specified radius, so the manufacturer's
bend-radius requirements must be maintained during installation.
4. What is the primary purpose of the cladding surrounding an optical
fiber core?
A. To provide electrical grounding
B. To confine light within the core through total internal reflection
,C. To increase the cable's tensile strength
D. To provide electromagnetic shielding
B. To confine light within the core through total internal reflection
The cladding has a lower refractive index than the core and allows
optical energy to remain confined within the core through total internal
reflection.
5. Which component of a fiber-optic cable provides the primary
structural protection around the optical fibers?
A. Fiber core
B. Cladding
C. Cable jacket
D. Optical transmitter
C. Cable jacket
The outer jacket protects the cable assembly from environmental and
mechanical hazards such as abrasion, moisture, and physical contact.
6. What is the main function of a fiber-optic fusion splicer?
A. Measure cable length using electrical resistance
B. Permanently join two optical fibers by aligning and melting their ends
C. Convert optical signals into electrical signals
D. Install connectors without stripping fiber
B. Permanently join two optical fibers by aligning and melting their ends
, A fusion splicer precisely aligns fiber ends and uses an electric arc to fuse
them together, normally producing a low-loss permanent splice.
7. Which instrument is specifically used to locate faults, measure fiber
length, and identify the approximate location of reflective events
along an optical fiber?
A. Multimeter
B. OTDR
C. Clamp meter
D. Megohmmeter
B. OTDR
An optical time-domain reflectometer sends optical pulses through the
fiber and analyzes returned light to identify events, attenuation, splice
losses, connector reflections, and approximate fault locations.
8. A fiber technician measures the optical power received at the end
of a link. Which unit is normally used to express absolute optical
power?
A. dBm
B. dB/km
C. Ohms
D. Hertz
A. dBm
dBm expresses optical power relative to 1 milliwatt and is commonly
used when measuring transmitter output and receiver input levels.
