L02M04 Conduit Bending
 
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L02M04 Conduit Bending

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

 1. 
Dog legs can be avoided when making offset bends by _____.
a.
maintaining the centerline for all bends
b.
making sure all bends are 90 degrees
c.
making sure all bends are 6" from the previous bend
d.
rebending everything for accuracy
 

 2. 
When making bends on short lengths of conduit, the shoe may be prevented from creeping by

_____.
a.
clamping the conduit
b.
screwing a coupling onto the conduit
c.
filing a rough surface on the conduit
d.
wrapping a rag around the conduit
 

 3. 
Which of the following will produce an offset in a conduit run?
a.
Improperly calculated sweep bends
b.
Two kick bends in opposite directions
c.
A small obstruction being crossed
d.
A single change in direction
 

 4. 
A 30° kick has a hypotenuse of 10". Given that the cosecant of 30° is 2, determine the side opposite or how far off the surface the end of the kick needs to be.
a.
5"
b.
10"
c.
15"
d.
20"
 

 5. 
The two dimensions an electrician must know when making a 90° stub bend are the _____.
a.
conduit diameter and rise
b.
bend radius and conduit diameter
c.
desired rise and take-up distance
d.
take-up distance and conduit diameter
 

 6. 
Hydraulic benders are capable of bending rigid pipe up to and including _____.
a.
2-1/2" in diameter
b.
3" in diameter
c.
4" in diameter
d.
5" in diameter
 

 7. 
A single change in direction of less than 90° is known as a(n) _____.
a.
elbow
b.
offset
c.
saddle
d.
kick
 

 8. 
One of the characteristics of aluminum conduit is that it _____.
a.
is easy to bend consistently
b.
is lightweight
c.
has high ground impedance
d.
corrodes easily
 

 9. 
When making concentric bends in conduit of different sizes, the first step in calculating the radius of a bend is to _____.
a.
calculate one-half the outside diameter of the innermost conduit
b.
determine the radius of the innermost bend
c.
determine the distance between the two runs of conduit
d.
calculate the outside diameter of the adjacent conduit
 

 10. 
Which of the following is a type of bending shoe?
a.
Concentric
b.
Radial
c.
Segmented
d.
Axial
 

 11. 
Springback is a term used to describe the _____.
a.
return of the bender shoe to its normal position after a bend
b.
reaction of a power bender after the machine is jogged
c.
tendency of the conduit to relax to a slightly looser bend angle when the bender is released
d.
amount of take-up required for a sweep bend
 

 12. 
Which combination of bends between pull points is allowed by the NEC®?
a.
Three elbows, two 45° offsets, and two 15° kicks
b.
One elbow, one 120° saddle, and two 45° offsets
c.
Two 60° saddles, an elbow, two 45° offsets, and three 15° kicks
d.
Two 45° offsets, an elbow, and three 15° kicks
 

 13. 
What is the developed length for an elbow bend in 5" conduit if the center line radius is 20"?
a.
7.85"
b.
25"
c.
31.4"
d.
39.25"
 

 14. 
The NEC® specifies the minimum radius of conduit bends because _____.
a.
installation of additional pull boxes is more efficient
b.
bending equipment cannot produce tighter bends
c.
the insulation on conductors could be damaged as it is pulled
d.
the internal diameter of the conduit may be increased
 

 15. 
How much conduit is needed if the rise is 15", the leg length is 10", and the gain is 8.6"?
a.
13.6"
b.
16.4"
c.
33.6"
d.
36.4"
 

 16. 
You are making a 14" stub-up in 1" RMC and the bender deduct is listed as 10". Where do you make your first mark?
a.
1" from the end of the conduit
b.
4" from the end of the conduit
c.
5" from the end of the conduit
d.
6" from the end of the conduit
 

 17. 
Which of the following is true when joining PVC conduit?
a.
The cementing and joining operation should not exceed 20 seconds.
b.
Deburring is not necessary with PVC.
c.
PVC must be cut using a special PVC saw.
d.
When joining PVC, avoid rotating the conduit after it has been inserted into the fitting.
 

 18. 
PVC expansion couplings are seldom required in _____.
a.
any installation
b.
outdoor installations
c.
long conduit runs
d.
underground installations
 

 19. 
You are making a 15" offset with two 30° bends with an offset multiplier of 2. The distance between bends is _____.
a.
7.5"
b.
15"
c.
22.5"
d.
30"
 

 20. 
A conduit run must pass over a pipe and then over a rectangular duct. This will require a total of _____.
a.
three bends
b.
five bends
c.
seven bends
d.
nine bends
 



 
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