AZ L-61 Fiber Optic Systems Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary advantage of fiber optic cabling over copper
cabling?
A. Lower installation cost
B. Immunity to electromagnetic interference
C. Easier to splice
D. Higher susceptibility to noise
B. Immunity to electromagnetic interference
Fiber optic cables transmit data using light rather than electricity,
making them immune to electromagnetic interference.
2. Which type of fiber optic cable is most commonly used for long-
distance, high-speed applications?
A. Multimode
B. Single-mode
C. Plastic optical fiber
D. Coaxial
B. Single-mode
Single-mode fiber supports long-distance transmission with minimal
signal loss due to its small core diameter.
3. What is the typical core diameter of a multimode fiber optic cable?
A. 9 µm
B. 50–62.5 µm
, C. 125 µm
D. 200 µm
B. 50–62.5 µm
Multimode fibers have a larger core diameter to allow multiple light
modes, typically 50 or 62.5 microns.
4. What is the main function of an optical transceiver?
A. To convert electrical signals to light signals and vice versa
B. To amplify light signals
C. To splice two fibers
D. To test optical loss
A. To convert electrical signals to light signals and vice versa
Optical transceivers transmit and receive data by converting between
electrical and optical signals.
5. Which test measures the total signal loss of a fiber optic link?
A. Optical Time Domain Reflectometer (OTDR) test
B. Insertion loss test
C. Return loss test
D. Visual inspection
B. Insertion loss test
Insertion loss measures the reduction in optical power through a
fiber link, indicating the total loss.
6. Which device is used to detect breaks or faults along a fiber optic
cable?
A. Optical power meter
B. OTDR
C. Fusion splicer
D. Visual fault locator
B. OTDR
An OTDR sends pulses through the fiber and measures reflected
signals to locate faults or breaks.
7. What is the purpose of a fiber optic patch panel?
A. To splice fibers permanently
B. To terminate and manage fiber connections
C. To amplify optical signals
D. To convert optical signals to electrical signals
B. To terminate and manage fiber connections
, Patch panels provide organized termination points for fiber
connections and simplify network management.
8. Which type of connector is commonly used in fiber optic networks for
high-density applications?
A. SC
B. ST
C. LC
D. FC
C. LC
LC connectors are small form factor connectors designed for high-
density installations.
9. What is a primary cause of signal attenuation in fiber optic cables?
A. Electromagnetic interference
B. Bending losses and scattering
C. Poor grounding
D. Voltage fluctuations
B. Bending losses and scattering
Attenuation in fiber optic cables occurs due to light scattering,
absorption, and bending losses.
10. What is the difference between single-mode and multimode fiber
in terms of light propagation?
A. Single-mode allows multiple light paths, multimode allows one
B. Single-mode allows one light path, multimode allows multiple
C. Single-mode uses copper, multimode uses glass
D. Single-mode is plastic, multimode is glass
B. Single-mode allows one light path, multimode allows multiple
Single-mode fibers have a narrow core allowing a single light mode,
while multimode supports multiple light paths.
11. Which tool is essential for proper fiber stripping before
termination?
A. OTDR
B. Fiber cleaver
C. Fiber stripper
D. Fusion splicer
C. Fiber stripper
A fiber stripper removes protective coatings without damaging the
glass core.
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary advantage of fiber optic cabling over copper
cabling?
A. Lower installation cost
B. Immunity to electromagnetic interference
C. Easier to splice
D. Higher susceptibility to noise
B. Immunity to electromagnetic interference
Fiber optic cables transmit data using light rather than electricity,
making them immune to electromagnetic interference.
2. Which type of fiber optic cable is most commonly used for long-
distance, high-speed applications?
A. Multimode
B. Single-mode
C. Plastic optical fiber
D. Coaxial
B. Single-mode
Single-mode fiber supports long-distance transmission with minimal
signal loss due to its small core diameter.
3. What is the typical core diameter of a multimode fiber optic cable?
A. 9 µm
B. 50–62.5 µm
, C. 125 µm
D. 200 µm
B. 50–62.5 µm
Multimode fibers have a larger core diameter to allow multiple light
modes, typically 50 or 62.5 microns.
4. What is the main function of an optical transceiver?
A. To convert electrical signals to light signals and vice versa
B. To amplify light signals
C. To splice two fibers
D. To test optical loss
A. To convert electrical signals to light signals and vice versa
Optical transceivers transmit and receive data by converting between
electrical and optical signals.
5. Which test measures the total signal loss of a fiber optic link?
A. Optical Time Domain Reflectometer (OTDR) test
B. Insertion loss test
C. Return loss test
D. Visual inspection
B. Insertion loss test
Insertion loss measures the reduction in optical power through a
fiber link, indicating the total loss.
6. Which device is used to detect breaks or faults along a fiber optic
cable?
A. Optical power meter
B. OTDR
C. Fusion splicer
D. Visual fault locator
B. OTDR
An OTDR sends pulses through the fiber and measures reflected
signals to locate faults or breaks.
7. What is the purpose of a fiber optic patch panel?
A. To splice fibers permanently
B. To terminate and manage fiber connections
C. To amplify optical signals
D. To convert optical signals to electrical signals
B. To terminate and manage fiber connections
, Patch panels provide organized termination points for fiber
connections and simplify network management.
8. Which type of connector is commonly used in fiber optic networks for
high-density applications?
A. SC
B. ST
C. LC
D. FC
C. LC
LC connectors are small form factor connectors designed for high-
density installations.
9. What is a primary cause of signal attenuation in fiber optic cables?
A. Electromagnetic interference
B. Bending losses and scattering
C. Poor grounding
D. Voltage fluctuations
B. Bending losses and scattering
Attenuation in fiber optic cables occurs due to light scattering,
absorption, and bending losses.
10. What is the difference between single-mode and multimode fiber
in terms of light propagation?
A. Single-mode allows multiple light paths, multimode allows one
B. Single-mode allows one light path, multimode allows multiple
C. Single-mode uses copper, multimode uses glass
D. Single-mode is plastic, multimode is glass
B. Single-mode allows one light path, multimode allows multiple
Single-mode fibers have a narrow core allowing a single light mode,
while multimode supports multiple light paths.
11. Which tool is essential for proper fiber stripping before
termination?
A. OTDR
B. Fiber cleaver
C. Fiber stripper
D. Fusion splicer
C. Fiber stripper
A fiber stripper removes protective coatings without damaging the
glass core.
