Practice test

Plumbing Practice Exam 3

Free plumbing practice exam 3 covering pipe sizing, vents, slope, and UPC and IPC basics. Twenty-five questions with instant scoring and explanations.

These questions are for study practice only and are not official exam questions.

Question 1

1

What is the approximate flow rate, in gpm, a modern WaterSense bathroom lavatory faucet is limited to?

Question 2

2

What does a saddle valve commonly used for ice makers risk doing over time?

Question 3

3

What is the recommended minimum residual pressure at the highest fixture in a building?

Question 4

4

Copper tube Type L versus Type M differ in what way?

Question 5

5

What is the purpose of a water meter?

Question 6

6

Which fixture supply line material is rated to handle the hot water side as well as cold?

Question 7

7

How many DFUs is a residential water closet (1.6 gpf flush tank) typically assigned?

Question 8

8

What is the minimum size building drain serving a single water closet?

Question 9

9

What is back-pressure in a drainage system?

Question 10

10

What is self-siphonage of a trap?

Question 11

11

An air admittance valve (AAV) does what?

Question 12

12

What is the proper location for a cleanout at the base of a vertical waste stack?

Question 13

13

What is the difference in approach between the UPC and IPC?

Question 14

14

What does it mean that a fixture is 'listed' for a use?

Question 15

15

During a final plumbing inspection, what is typically checked?

Question 16

16

Why must a closet flange be installed at the correct height relative to the finished floor?

Question 17

17

What is the purpose of a water heater pan with a drain under a heater located in a finished area?

Question 18

18

What is the typical color/marking convention to identify potable water lines in some commercial settings?

Question 19

19

Reclaimed (recycled) water piping is commonly identified by what color?

Question 20

20

A vent that connects an individual fixture's trap arm directly to a vent stack is called what?

Question 21

21

What is the maximum trap arm length generally allowed for a 2-inch trap arm?

Question 22

22

What is the main shutoff valve used for?

Question 23

23

What is the minimum side clearance from the centerline of a water closet to a wall or adjacent fixture?

Question 24

24

A whole-house water softener works by what process?

Question 25

25

What is the minimum number of water closets a small business with mixed-gender employees generally must provide per code occupancy tables?

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