1|Page
2025 New IBHRE Certification Exam Prep with 400
Most Recently Tested Questions and Correct
Verified Answers/ IBHRE Exam / NEWEST!
What are the two glass components that are the building
blocks of all fiber optic cables? - ...ANSWER...✓✓ 1. Core
2. Cladding
What is the outside diameter of the core for single mode
fiber? - ...ANSWER...✓✓ 8-10 µm but the general rule is
9µm
What is the outside diameter of the cladding for single
mode fiber? - ...ANSWER...✓✓ 125 µm
Multimode fiber has two core sizes which are? -
...ANSWER...✓✓ 62.5 µm
50 µm
What is the outside diameter of the cladding for
multimode fiber? - ...ANSWER...✓✓ 125 µm
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What is the protective coating that surrounds the cladding
material for both single and multimode fiber called? -
...ANSWER...✓✓ Acrylate
What is the outside diameter of the Acrylate coating? -
...ANSWER...✓✓ 250 µm
The cladding is epoxied to the inside of what part of a
connector? - ...ANSWER...✓✓ Ferrule
Buffer tube fanout kits are used for loose tube fiber to
provide what key features? - ...ANSWER...✓✓ Protection -
takes 250 µm delicate fiber and increases the outside
diameter with a protective furcation tube to 900 µm.
Termination - allows direct termination of connectors to
the fiber.
Fiber cables have length markings on the outside jacket
that are considered? - ...ANSWER...✓✓ Sequential
markings
The term for fiber that is in a system to account for
moves, adds or changes is called? - ...ANSWER...✓✓ The
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term for fiber that is in a system to account for moves,
adds or changes is called?
Where is OSP fiber slack kept in a fiber system when the
OSP fiber enters a building? - ...ANSWER...✓✓ Outside
What is the minimum bend radius for fiber cable while
installing it into a system? - ...ANSWER...✓✓ 20 times
cable the diameter
What is the minimum bend radius of a fiber cable once it
is installed in a fiber system? - ...ANSWER...✓✓ 10 times
the cable diameter.
Over bending of a fiber will cause what? - ...ANSWER...✓✓
A Macrobend
A macrobend will cause what to a fiber? - ...ANSWER...✓✓
Attenuation
Macro bends effect which type of wavelengths? -
...ANSWER...✓✓ Higher wavelengths over 1470 nm.
2025 New IBHRE Certification Exam Prep with 400
Most Recently Tested Questions and Correct
Verified Answers/ IBHRE Exam / NEWEST!
What are the two glass components that are the building
blocks of all fiber optic cables? - ...ANSWER...✓✓ 1. Core
2. Cladding
What is the outside diameter of the core for single mode
fiber? - ...ANSWER...✓✓ 8-10 µm but the general rule is
9µm
What is the outside diameter of the cladding for single
mode fiber? - ...ANSWER...✓✓ 125 µm
Multimode fiber has two core sizes which are? -
...ANSWER...✓✓ 62.5 µm
50 µm
What is the outside diameter of the cladding for
multimode fiber? - ...ANSWER...✓✓ 125 µm
,2|Page
What is the protective coating that surrounds the cladding
material for both single and multimode fiber called? -
...ANSWER...✓✓ Acrylate
What is the outside diameter of the Acrylate coating? -
...ANSWER...✓✓ 250 µm
The cladding is epoxied to the inside of what part of a
connector? - ...ANSWER...✓✓ Ferrule
Buffer tube fanout kits are used for loose tube fiber to
provide what key features? - ...ANSWER...✓✓ Protection -
takes 250 µm delicate fiber and increases the outside
diameter with a protective furcation tube to 900 µm.
Termination - allows direct termination of connectors to
the fiber.
Fiber cables have length markings on the outside jacket
that are considered? - ...ANSWER...✓✓ Sequential
markings
The term for fiber that is in a system to account for
moves, adds or changes is called? - ...ANSWER...✓✓ The
, 3|Page
term for fiber that is in a system to account for moves,
adds or changes is called?
Where is OSP fiber slack kept in a fiber system when the
OSP fiber enters a building? - ...ANSWER...✓✓ Outside
What is the minimum bend radius for fiber cable while
installing it into a system? - ...ANSWER...✓✓ 20 times
cable the diameter
What is the minimum bend radius of a fiber cable once it
is installed in a fiber system? - ...ANSWER...✓✓ 10 times
the cable diameter.
Over bending of a fiber will cause what? - ...ANSWER...✓✓
A Macrobend
A macrobend will cause what to a fiber? - ...ANSWER...✓✓
Attenuation
Macro bends effect which type of wavelengths? -
...ANSWER...✓✓ Higher wavelengths over 1470 nm.
