AZ L-61 Fiber Optic Systems Contractor
Exam Practice Questions And Correct
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Rationales 2027 Q&A | Instant
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1. What is the primary function of an optical fiber in a communications
system?
A. Conduct electrical current
B. Transmit information using light
C. Provide mechanical support only
D. Generate electrical power
Answer: B. Transmit information using light
Rationale: Optical fiber carries information as pulses or modulated signals
of light through a glass or plastic core.
2. Which part of a fiber optic cable carries most of the optical signal?
,A. Jacket
B. Strength member
C. Core
D. Armor
Answer: C. Core
Rationale: The optical signal travels primarily through the fiber core, while
the cladding helps keep the light confined within it.
3. What is the purpose of the cladding surrounding an optical fiber core?
A. Increase electrical conductivity
B. Keep light confined within the core
C. Provide AC power
D. Prevent all physical bending
Answer: B. Keep light confined within the core
Rationale: The cladding has a lower refractive index than the core and
enables light to remain guided through the fiber.
4. Which type of fiber generally has a smaller core?
A. Multimode fiber
B. Single-mode fiber
,C. Coaxial cable
D. Twinaxial cable
Answer: B. Single-mode fiber
Rationale: Single-mode fiber has a very small core and is designed
primarily for one propagation mode, making it suitable for long-distance,
high-bandwidth transmission.
5. Which fiber type is commonly used for shorter-distance premises
applications?
A. Multimode fiber
B. Single-mode fiber only
C. Copper service wire
D. Telephone pair cable
Answer: A. Multimode fiber
Rationale: Multimode fiber is commonly used for shorter-distance building
and campus applications because of its larger core and suitable bandwidth
characteristics.
6. What does attenuation describe in a fiber optic system?
A. Increase in optical power
B. Loss of optical power as the signal travels
, C. Increase in cable diameter
D. Electrical grounding resistance
Answer: B. Loss of optical power as the signal travels
Rationale: Attenuation is the reduction of optical signal power caused by
absorption, scattering, bending, connectors, splices, and other losses.
7. Which unit is commonly used to express optical power loss?
A. Volts
B. Amperes
C. Decibels
D. Ohms
Answer: C. Decibels
Rationale: Fiber loss is normally measured in decibels (dB), allowing
installers to evaluate the loss of links, splices, and connectors.
8. What is the primary purpose of a fiber optic connector?
A. Convert light into electricity
B. Provide a detachable optical connection
C. Increase cable voltage
D. Ground the fiber core
Answer: B. Provide a detachable optical connection
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary function of an optical fiber in a communications
system?
A. Conduct electrical current
B. Transmit information using light
C. Provide mechanical support only
D. Generate electrical power
Answer: B. Transmit information using light
Rationale: Optical fiber carries information as pulses or modulated signals
of light through a glass or plastic core.
2. Which part of a fiber optic cable carries most of the optical signal?
,A. Jacket
B. Strength member
C. Core
D. Armor
Answer: C. Core
Rationale: The optical signal travels primarily through the fiber core, while
the cladding helps keep the light confined within it.
3. What is the purpose of the cladding surrounding an optical fiber core?
A. Increase electrical conductivity
B. Keep light confined within the core
C. Provide AC power
D. Prevent all physical bending
Answer: B. Keep light confined within the core
Rationale: The cladding has a lower refractive index than the core and
enables light to remain guided through the fiber.
4. Which type of fiber generally has a smaller core?
A. Multimode fiber
B. Single-mode fiber
,C. Coaxial cable
D. Twinaxial cable
Answer: B. Single-mode fiber
Rationale: Single-mode fiber has a very small core and is designed
primarily for one propagation mode, making it suitable for long-distance,
high-bandwidth transmission.
5. Which fiber type is commonly used for shorter-distance premises
applications?
A. Multimode fiber
B. Single-mode fiber only
C. Copper service wire
D. Telephone pair cable
Answer: A. Multimode fiber
Rationale: Multimode fiber is commonly used for shorter-distance building
and campus applications because of its larger core and suitable bandwidth
characteristics.
6. What does attenuation describe in a fiber optic system?
A. Increase in optical power
B. Loss of optical power as the signal travels
, C. Increase in cable diameter
D. Electrical grounding resistance
Answer: B. Loss of optical power as the signal travels
Rationale: Attenuation is the reduction of optical signal power caused by
absorption, scattering, bending, connectors, splices, and other losses.
7. Which unit is commonly used to express optical power loss?
A. Volts
B. Amperes
C. Decibels
D. Ohms
Answer: C. Decibels
Rationale: Fiber loss is normally measured in decibels (dB), allowing
installers to evaluate the loss of links, splices, and connectors.
8. What is the primary purpose of a fiber optic connector?
A. Convert light into electricity
B. Provide a detachable optical connection
C. Increase cable voltage
D. Ground the fiber core
Answer: B. Provide a detachable optical connection
