Chapter 09 2021 UPC

1. Vent pipes protect fixture traps against ____________________________.

• a. evaporation
• b. siphonage
• c. clogging
• d. cross-connections

2. The vent system shall be designed to prevent a trap seal from being exposed to a pressure differential on the outlet side of the trap that exceeds __ inch of a water column.

• a. .50
• b. 1
• c. 2
• d. 3

3. In the sketch, the primary settling tank ________________________.

• a. requires a backwater valve
• b. requires a vent pipe
• c. is correct as shown
• d. does not require a cleanout

4. Under certain conditions, traps serving sinks that are part of the equipment of bars, soda fountains, and counters ____________________________.

• a. need not be vented
• b. shall be vented
• c. may be wet-vented
• d. may not be wet-vented

5. ABS or PVC-DWV piping installations exposed within ducts or plenums shall be limited to a flame-spread index of not more than 25 or a smoke index of 50 except for _________________.

• a. two-story buildings
• b. structures not over three floors above grade
• c. the restrictions found in IS 5 & 9
• d. single-family homes

6. Copper tube shall not be used for _____.

• a. chemical or industrial wastes
• b. water piping
• c. underground drainage piping
• d. above ground drainage piping

7. Changes in direction of vent piping shalI be made by ___________________.

• a. heating the pipe and bending
• b. welded joints where possible
• c. threaded fittings or caulked joints
• d. appropriate use of fittings

8. The diameter of an individual vent shalI not be Iess than __________________.

• a. 1-1/4 inches
• b. 1-1/2 inches
• c. 2 inches
• d. 3 inches

9. The combination of vent pipes that will provide sufficient aggregate cross-sectional vent area for required a 4-inch house sewer is _____.

• a. 1 - 2 inch and 4 - 1 1/2 inch
• b. 2 - 2 inch and 1 - 2 1/2 inch
• c. 3 - 2 inch and 1 - 1 1/2 inch
• d. 4 - 2 inch

10. The minimum size vent pipe that may serve a 4-inch trap is _____ inches.

• a. 1 1/4
• b. 1 1/2
• c. 2
• d. 4