Name: 
 

Fiber U Bend Radius



Use this quiz to check your comprehension of the course before taking the Certificate of Completion test.

True/False
Indicate whether the statement is true or false.
 

 1. 

Most fiber optic cables have a minimum bend radius of 20 times the cable diameter when the cable is being pulled under tension, but some cables may be 15 times or other values as specified by the manufacturer for that cable design.
 

 2. 

The size of the pulley being used with this fiber optic cable is the correct size.

tf002-1.jpg
 

 3. 

Bend radius limitations apply to both underground cables pulled in conduit and aerial cables installed by lashing to a messenger.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 4. 

The diameter of a circle is _______ the radius, important to remember when one is looking at the radius around a corner or the diameter of a capstan, pulley or service loop.
a.
Half
b.
Twice
c.
The radius times π
d.
Equal to
 

 5. 

A loose tube cable with 144 fibers has a diameter of 12.5mm/0.5”. Using typical specifications, what would be the minimum bend radius of this cable while being installed in conduit?
a.
125mm/5”
b.
250mm/10”
c.
100mm/8”
d.
500mm/15”
 

 6. 

A loose tube cable with 144 fibers has a diameter of 12.5mm/0.5”. Using typical specifications, what would be the minimum bend diameter of this cable when stored in storage loops in a manhole?
a.
125mm/5”
b.
250mm/10”
c.
100mm/8”
d.
500mm/20”
 

 7. 

A loose tube cable with 144 fibers has a diameter of 12.5mm/0.5”. Using typical specifications, what would be the minimum diameter of a pulley or capstan used during installation?
a.
125mm/5”
b.
250mm/10”
c.
100mm/8”
d.
500mm/20”
 

Multiple Response
Identify one or more choices that best complete the statement or answer the question.
 

 8. 

To better understand the meaning of bend radius and diameter, one can think of bend radius to refer to _______.
 a.
Bending the cable around corners or obstacles
 b.
The size of pulleys
 c.
The size of storage loops
 d.
The opening size of a manhole
 

 9. 

To better understand the meaning of bend radius and diameter, one can think of bend diameter to refer to _______. (more than one answer may be correct)
 a.
Bending the cable around corners or obstacles
 b.
The size of pulleys
 c.
The size of storage loops
 d.
The opening size of a manhole
 

 10. 

If a cable is bent beyond its specified minimum bend radius, it may have _________.(Check all that apply)
 a.
Damaged the structure of the cable and compromised its reliability
 b.
Fibers with higher attenuation due to the stress
 c.
Broken fibers
 d.
Invalidated the warranty
 

Matching
 
 
Identify the terms used to describe a circle:
grp001-1.jpg
 

 11. 

Circumference
 

 12. 

Radius
 

 13. 

Diameter
 
 
Match the equations below to the letters in red.

grp002-1.jpg
 

 14. 

R = 20 x d
 

 15. 

R = 10 x d
 

 16. 

D = 20 x d
 

 17. 

D = 40 x d
 



 
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