Chapter 3 Practice Test

Question 1

What is the maximum boring percentage allowed in a load-bearing stud if doubled and not successive?

Answer 1

40%

2018 NCPC; NCRC P2603.2

Question 2

How often must a 1” diameter Type K copper tubing be supported when run horizontally?

Answer 2

Every 6 feet

Table 308.5; NCRC P2605.1

Question 3

How long must air and water tests of vent/drain systems be maintained at constant pressure?

Answer 3

15 minutes

312.2; NCRC P2503.5

Question 4

1-1/2” PVC installed horizontally in commercial buildings must be supported every:

Answer 4

4 feet

Table 308.5; NCRC P2605.1

Question 5

What is the term for the pipe that receives all discharges inside the building and leads outside?

Answer 5

Building drain

Chapter 2, Definition; NCRC – Chapter 2

Question 6

Piping parallel to a footing must not be installed:

Answer 6

Closer than 6” from the footing

307.5; NCRC P2604.4

Question 7

A water main is:

Answer 7

A public water supply pipe

Definition

Question 8

Copper tubing 1-1/2”+ must be horizontally supported every:

Answer 8

10 feet

Table 308.5; NCRC P2605.1

Question 9

Max horizontal spacing for hangers when installing cast iron pipe in 10’ sections?

Answer 9

10 feet

Table 308.5 Note a; NCRC P2605.1 Note a

Question 10

All toilet rooms must have:

Answer 10

Both light and ventilation

310.1; NCRC R303

Question 11

Minimum height of a urinal partition from the finished floor?

Answer 11

5 feet

312.2; NCRC P2503.5.1

Question 12

Minimum test pressure for drainage piping?

Answer 12

15 psi

405.3.5

Question 13

Horizontal support for 3/4” CPVC?

Answer 13

Every 3 feet

312.2; NCRC P2503.5.1 (3)

Question 14

Rigid bracing must be used at changes >45° for pipe 4” and larger?

Answer 14

True

308.5; Table P2605.1

Question 15

Minimum depth for exterior water service line?

306.1; NCRC P2605.1 (2)

Answer 15

12” or 6” below frost line.
Whichever is greater.

Question 16

How must buried pipe be supported?

Answer 16

Throughout its entire length

305.6; NCRC P2603.2.1

Question 17

Minimum cover on soil pipe leaving a building?

Answer 17

3”

Appendix C; NCRC R502.8.1

Question 18

Minimum thickness for protective shield plates?

Answer 18

0.0575”

317.2; NCRC R315

Question 19

Max bore in a joist is:

Answer 19

1/3 the depth

Appendix C; NCRC R502.8.1

Question 20

When must CO alarms be installed in existing homes?

Answer 20

When fuel-fired appliances are replaced

317.2; NCRC R315

Question 21

Max time for absence of temp toilet facilities for crews?

Answer 21

1 Day

311.1

Question 22

Max opening size on drain inlet strainer plates?

Answer 22

0.5”

304.2

Question 23

Which code do you refer to for fire proofing pipe through wall openings?

Answer 23

Building Code

307.3; NCRC R302.4.1.2

Question 24

Minimum R-value for pipe insulation in unconditioned areas?

Answer 24

R-6.50

305.4; NCRC P2603.5

Question 25

The seal on exterior wall openings for piping must be:

Answer 25

Water tight ## Footnote 305.5; NCRC P2607.2

Question 26

What materials can be used for testing drainage pipe?

Answer 26

Water or Air ## Footnote Section 312; NCRC P2503

Question 27

Head of water required for DWV pipe test?

Answer 27

10’ of head ## Footnote 312.2; NCRC P2503.5.1

Question 28

Vertical support spacing for 1” copper tubing?

Answer 28

Every 10 feet ## Footnote Table 308.5; NCRC Table P2605.1