Conduit Fabrication L2 Lesson 3

Question 1

The center of bend marks are usually indicated on a new mechanical/electric bender (or its shoes).

Select one:

True

False

Question 2

The centers of the various standard bend angles must be found, and the shoe(s) marked on a new mechanical or electric bender in order to use the push-through method of bending.

Select one:

True

False

Question 3

A multi-groove bending shoe is to be fully charted for 3/4 inch, 1 inch, and 1 1/4 inch rigid metal conduit. How many center of bend marks will need to be placed on the shoe?

a. 3

b. 6

c. 9

d. 12

Question 4

Which of the following is not a common standard angle of bend used to make offsets and kicks?

a. 10°

b. 15°

c. 22 1/2 °

d. 30°

e. 45°

Question 5

Center of bend marks on the shoe of a bender are not commonly used when bending which of the following bends?

a. Offsets

b. 90's

c. Kicks

d. Three-bend saddles

e. Compound 90's

Question 6

When determining the center of a bend, how is the straightedge placed to mark the conduit?

a. The straightedge is held against the outside of each side of the bend.

b. The straightedge is held against the inside of each side of the bend.

c. The straightedge can be held tightly against the conduit only.

d. None of the above

Question 7

When using a straightedge to make pencil marks, the pencil marks should be made as close to the straightedge as possible.

Select one:

True

False

Question 8

On a typical bending shoe, how far will the 22 1/2° center mark be from the 45° center mark?

a. The 22 1/2° mark will be ahead of the 45° mark by the trade size of the conduit.

b. The 22 1/2° mark will be behind the 45° mark by the trade size of the conduit.

c. The 22 1/2° mark will be ahead of the 45° mark by one-quarter inch.

d. The 22 1/2° mark will be behind the 45° mark by one-quarter inch.

Question 9

A 30° bend is to be made using an electric or mechanical bender, using the travel to measure the bend angle. Which statement best describes the bending procedure?

a. The bender will be advanced until the end-of-travel mark on the conduit is aligned with

the travel benchmark at the back of the bender.

b. The bender will be advanced until the end-of-travel mark on the conduit goes slightly

beyond the travel benchmark at the back of the bender.

c. The bender will be advanced until the arrow on the shoe is aligned with the 30° marking

on the bender.

d. The bender will be advanced until the arrow on the bending shoe goes a few degrees

beyond 30°.

Question 10

The radius adjustment is used to move the center of the bend closer to the obstruction.

Select one:

True

False

Question 11

What angle of bend is typically used in order to determine the radius adjustment?

a. 15°

b. 22.5°

c. 30°

d. 45°

Question 12

As a rule, the distance between the centers of a 22 1/2° bend and a 45° bend when marking a bending shoe will be approximately the trade size of the conduit.

Select one:

True

False

Question 13

Select the correct formula for “setback.”

a. Take-Up + Gain = Setback

b. Gain − Take-Up = Setback

c. Stub-Up − hrink = Setback

d. Take-Up − Gain = Setback

Question 14

When fabricating three-bend saddles with a 45° center bend and using a push-through bending technique, which method will generally produce the most accurate result?

a. Measured Rise Method

b. Multiplier Method using a bend spacing of (2.6 × Rise) + O.D. of Conduit

c. Multiplier Method using a bend spacing of 3.0 × Rise

d. Multiplier Method using a bend spacing of (1.4 × Rise) + Trade Size of Conduit

Question 15

An 8-inch kick is to be made using the multiplier method in a piece of 2-inch RMC. What will be the distance between the setback mark and the center of the bend if the conduit is to be bent to 22 1/2°? (Round the FINAL answer to the nearest inch.)

Distance = ?

Question 16

The chart for a particular bender indicates that a 2-inch RMC will have a gain of 6 7/8 inches and a take-up of 15 3/4 inches. The 8-inch kick from the previous question is to be made with a stub length of 25 1/2 inches, and the overall run length of the leg is to be 48 inches.

Calculate the total length of conduit needed. (Round the answer to the nearest eighth inch.) Note: Use the fraction constant when calculating for shrink.

Total length = ?

a. 67"

b. 67 7/8"

c. 68 1/8"

d. 68 3/4"

Question 17

The chart for a particular bender indicates that a 2-inch RMC will have a gain of 6 7/8 inches and a take-up of 15 3/4 inches. The 8-inch kick from the previous question is to be made with a stub length of 25 1/2 inches, and the overall run length of the leg is to be 48 inches.

Using the information from the previous question, calculate the distance from the end of the conduit to Mark 1 (the mark location for the stub to be bent). (Round the answer to the nearest eighth inch.)

Mark 1 = ?

a. 9 3/4"

b. 10"

c. 10 1/4"

d. 10 1/2"

Question 18

The chart for a particular bender indicates that a 2-inch RMC will have a gain of 6 7/8 inches and a take-up of 15 3/4 inches. The 8-inch kick from the previous question is to be made with a stub length of 25 1/2 inches, and the overall run length of the leg is to be 48 inches.

Using the information from the previous question(s), what will be the distance from Mark 1, the take-up mark, to Mark 2, the setback mark? (Round the answer to the nearest

eighth inch.)

Setback = ?

a. 8 1/2"

b. 8 7/8"

c. 9 1/8"

d. 9 5/8"

Question 19

Using the information from the previous questions, what will be the distance between

Mark 2, the setback mark, and Mark 3, the center of bend mark for the kick? (Round the FINAL answer to the nearest inch.)

Distance = ?

Question 20

A 30° offset has been fabricated in a length of 3/4-inch RMC to clear an obstruction.

Determine the distance from the end of the conduit to Mark 1. In this case the conduit will be coupled with another piece of conduit to the left (not shown) so no additional length will be needed for the threads. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch.)

Question 21

What is the distance from the end of the conduit to Mark 2? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch.)

Question 22

A 22 1/2° offset has been fabricated in a length of 1-inch RMC. In this case, the left end of the conduit will be connected to a box using two locknuts. Determine the distance from the end of the conduit to the two center-of-bend marks to fabricate this offset, and then select the answer which indicates the correct distance to the marks. (Note: Thread length = 1/2".)

a. 1st Mark at 30 5/8" and 2nd Mark at 20 1/4"

b. 1st Mark at 33 5/8" and 2nd Mark at 23 1/4"

c. 1st Mark at 34 1/8" and 2nd Mark at 23 3/4"

d. 1st Mark at 30 1/8" and 2nd Mark at 19 3/4"

Question 23

An offset is to be fabricated in a 3/4-inch RMC to extend from the 3/4-inch knockout in the box at the left, over the obstruction at the right, and down onto surface below. The offset will be pre-positioned using the radius adjustment so that it clears the obstruction.

This offset should use either 45° or 30° bends.

Select one:

True

False

Question 24

An offset is to be fabricated in a 3/4-inch RMC to extend from the 3/4-inch knockout in the box at the left, over the obstruction at the right, and down onto surface below. The offset will be pre-positioned using the radius adjustment so that it clears the obstruction.

If you were to lay out the offset for 10° bends, how far from the left end of the conduit would Mark 1 be placed? Keep in mind that you must accommodate the amount of thread that will be needed inside of the box. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Distance to Mark 1 = ?

Question 25

An offset is to be fabricated in a 3/4-inch RMC to extend from the 3/4-inch knockout in the box at the left, over the obstruction at the right, and down onto surface below. The offset will be pre-positioned using the radius adjustment so that it clears the obstruction.

If you were to lay out the offset for 10° bends, how far from the left end of the conduit would Mark 2 be placed? Keep in mind that you must accommodate the amount of thread that will be needed inside of the box. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Distance to Mark 2 = ?

Question 26

A 30° offset is to be made to clear the obstruction shown. In this case, the horizontal measurement is being made from the end of the previous length of conduit.

Calculate the distance to Mark 1 based upon what you see in the photo. The conduit is 3/4-inch RMC. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the

form of a decimal.)

Distance to Mark 1 = ?

Question 27

A 30° offset is to be made to clear the obstruction shown. In this case, the horizontal measurement is being made from the end of the previous length of conduit.

Based on what you see in the photo, determine the distance between marks and then calculate distance to Mark 2. The conduit is 3/4-inch RMC. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Distance to Mark 2 = ?

Question 28

A three-bend saddle in a piece of 1 1/4-inch RMC is to be fabricated to clear the obstruction shown. The conduit will be coupled to another piece of conduit on the left, from which the horizontal measurement is being taken.

Calculate the distance to Mark 1 to make this saddle, using a 45°center bend, and a multiplier of 2.6. Hint: Rise = 4 inches. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Distance to Mark 1 = ?

Question 29

A three-bend saddle in a piece of 1 1/4-inch RMC is to be fabricated to clear the obstruction shown. The conduit will be coupled to another piece of conduit on the left, from which the horizontal measurement is being taken.

Calculate the distance to Mark 2 to make this saddle, using a 45° center bend, and a multiplier of 2.6. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest 1/16 inch.)

a. 38 3/4"

b. 39"

c. 39 3/8"

d. 39 7/16"

Question 30

A three-bend saddle in a piece of 1 1/4-inch RMC is to be fabricated to clear the obstruction shown. The conduit will be coupled to another piece of conduit on the left, from which the horizontal measurement is being taken.

Calculate the distance to Mark 3 to make this saddle, using a 45° center bend, and a multiplier of 2.6. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest sixteenth inch.)

a. 63"

b. 63 1/8"

c. 63 9/16"

d. 63 7/8"

Question 31

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. Based upon what you see in the photo, determine the position of Mark 1 to

lay out this saddle using 22 1/2° bends. Allow for the conduit to be connected to a junction box using locknuts.

Note: The values calculated for this question may be used for additional questions.

(Round the answer to the nearest eighth inch.)

Note: As the conduit terminates in a junction box, an additional 1/2" of thread length will need to be included where applicable.

The image is the initial measurement from the center of the obstruction to the edge of the box to derive final marks.

a. 44"

b. 44 1/8"

c. 44 3/4"

d. 45 1/8"

Question 32

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. Based upon what you see in the photo, determine the position of Mark 2 to lay out this saddle using 22 1/2° bends. Allow for the conduit to be connected to a junction box using locknuts.

Note: The values calculated for this question may be used for additional questions.

(Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.) Be prepared to show your work on a separate sheet of paper.

Note: As the conduit terminates in a junction box, an additional 1/2" of thread length will

need to be included where applicable.

Distance to Mark 2 = ?

The image is the initial measurement from the center of the obstruction to the edge of

the box to derive final marks.

Question 33

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. Based upon what you see in the photo, determine the position of Mark 4 to lay out this saddle using 22 1/2° bends. Allow for the conduit to be connected to a junction box using locknuts.

Note: The values calculated for this question may be used for additional questions.

(Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Note: As the conduit terminates in a junction box, an additional 1/2" of thread length will need to be included where applicable.

Distance to Mark 4 = ?

The image is the initial measurement from the center of the obstruction to the edge of

the box to derive final marks.

Question 34

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. Based upon what you see in the photo, determine the distance between bend centers to lay out this saddle using 22 1/2° bends. Allow for the conduit to be

connected to a junction box using locknuts. Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest sixteenth inch.)

a. 7 7/8"

b. 8"

c. 8 7/16"

d. 9"

Question 35

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. Based upon what you see in the photo, determine the position of Mark 3 to lay out this saddle using 22 1/2° bends. Allow for the conduit to be connected to a junction box using locknuts.

Note: The values calculated for this question may be used for additional questions.

(Select the closest answer to your calculation.)

Note: As the conduit terminates in a junction box, an additional 1/2" of thread length will

need to be included where applicable.

The image is the initial measurement from the center of the obstruction to the edge of the box to derive final marks.

a. 25 3/4"

b. 26"

c. 28 1/2"

d. 28 11/16"

Question 36

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. Based upon what you see in the photo, determine the position of Mark 5 to lay out this saddle using 22 1/2° bends. Allow for the conduit to be connected to a

junction box using locknuts.

Note: The values calculated for this question may be used for additional questions.

(Select the closest answer to your calculation.)

Note: As the conduit terminates in a junction box, an additional 1/2" of thread length will

need to be included where applicable.

The image is the initial measurement from the center of the obstruction to the edge of the box to derive final marks.

a. 59 9/16"

b. 62"

c. 62 3/4"

d. 63"

Question 37

A four-bend saddle has been fabricated in a length of 1/2-inch RMC to go over an obstruction. If the saddle from the photo was being installed between two junction boxes with 65 inches between them, how long would you have to cut the conduit in order to thread it prior to bending?

Note: The values calculated for this question may be used for additional questions.

Note: As the conduit terminates in a junction box, an additional 1/2" of thread length will need to be included where applicable.

The image is the initial measurement from the center of the obstruction to the edge of the box to derive final marks.

a. 61 3/4"

b. 62 1/2"

c. 67 3/16"

d. 68 7/8"

Question 38

What is the length of the stub-up required? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Stub-up = ?

Question 39

What is the run length of the leg? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Leg Length = ?

Question 40

How much offset rise is required? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Offset Rise = ?

Question 41

How much will the run length of the leg shrink when the offset is bent? (Provide the answer in a fraction). Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Shrink = ?

Question 42

What is the value for the gain? The scenario involves a 3/4-inch RMC with a 90° stub-up and a 30° offset in the same piece of conduit. (The framing channel that the conduit is being supported on is 1 5/8 inches high.)

a. 3"

b. 3 1/4"

c. 4 1/8"

d. 5 1/4"

Question 43

How long will the conduit be cut in order to thread it before bending? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Length = ?

Question 44

What will be the distance from the end of the conduit to Mark 1, the take-up mark?

Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Mark 1 = ?

Question 45

What will be the distance from Mark 1 to Mark 2? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Setback = ?

Question 46

What will be the distance from Mark 2 to Mark 3? Note: The values calculated for this

question may be used for additional questions. (Round the answer to the nearest oneeighth inch. Answer the question in the form of a decimal.)

Mark 2 to Mark 3 = ?

Question 47

What will be the distance between Mark 3 and Mark 4? Note: The values calculated for this question may be used for additional questions. (Round the answer to the nearest eighth inch. Answer the question in the form of a decimal.)

Mark 3 to Mark 4 = ?

Question 48

Which mark will be used to form the first bend when you begin bending this conduit?

The scenario involves a 3/4-inch RMC with a 90° stub-up and a 30° offset in the same piece of conduit. (The framing channel that the conduit is being supported on is 1 5/8 inches high.)

a. Mark 1

b. Mark 2

c. Mark 3

d. Mark 4

Question 49

Click here to see the conduit installation photos.

Which mark will be used to form the second bend in the conduit?

The scenario involves a 3/4-inch RMC with a 90° stub-up and a 30° offset in the same piece of conduit. (The framing channel that the conduit is being supported on is 1 5/8 inches high.)

a. Mark 1

b. Mark 2

c. Mark 3

d. Mark 4

Question 50

Which mark will be used to form the third bend in the conduit?

The scenario involves a 3/4-inch RMC with a 90° stub-up and a 30° offset in the same piece of conduit. (The framing channel that the conduit is being supported on is 1 5/8 inches high.)

a. Mark 1

b. Mark 2

c. Mark 3

d. Mark 4

Question 51

Mark 2 should remain on the conduit for reference after doing your layout for the bend.

The scenario involves a 3/4-inch RMC with a 90° stub-up and a 30° offset in the same piece of conduit. (The framing channel that the conduit is being supported on is 1 5/8 inches high.)

Select one:

True

False