The Last 111 Test: DWV Systems

Question 1

Sanitary drainage systems can be divided into three parts: the pipes buried inside the building, the drain pipe outside the building and the…

Answer 1

Public Sewer

Question 2

Who is usually responsible for installing and maintaining the public sewers, lift stations, and treatment plants?

Answer 2

Municipality

Question 3

What is the circuit of piping inside a building to remove the wastes from plumbing fixtures and drains safely, reliably and efficiently?

Answer 3

DWV System

Question 4

What do many fixtures have to strain the wastewater before it enters the drainage piping?

Answer 4

Drains

Question 5

What in a trap protects people from airborne pathogens (germs), foul odors, and potentially explosive sewer gases?

Answer 5

Water Seal

Question 6

A fixture trap must be self cleaning, have a smooth interior waterway, be accessible for cleanout and…

Answer 6

Flush Completely

Question 7

What fixture should never be attached to another trap because of double trapping?

Answer 7

Water Closets

Question 8

Siphonage occurs when there is…

Answer 8

negative pressure inside the DWV piping

Question 9

A properly sized trap will prevent ______ from breaking the trap seal.

Answer 9

Back Pressure

Question 10

What balances the pressure within the drainage system to maintain the water seals in fixture traps?

Answer 10

Vents

Question 11

What do vents use to maintain equalized pressure throughout the drainage system?

Answer 11

Air

Question 12

Tables based on fall and pipe diameter give the maximum ______ allowed between the crown weir and the vent.

Answer 12

Distances

Question 13

If the total drop between the crown weir and the fixture vent exceeds one pipe diameter , the trap is likely to…

Answer 13

Siphon

Question 14

Plumbers must size the vents correctly according to how many _____ are connected, the number of drainage fixture units, and the length of the vent pipe.

Answer 14

Fixtures

Question 15

What are the most commonly used materials for DWV fittings?

Answer 15

Cast Iron & Plastic

Question 16

True or False: Fittings of the same design will have the same name unless they are made of different materials.

Answer 16

False

Question 17

Sanitary drainage fittings are made with a ______ design to allow for the smooth flow of material in the system.

Answer 17

Sweeping

Question 18

The direction of hub type fittings should flow from the _______ of the pipe.

Answer 18

bell to the spigot end

Question 19

If the branch inlets of sanitary fittings are ______, they can be joined to the DWV system without reducers.

Answer 19

Reducing

Question 20

A 1/4 bend turns ____ of a complete circle.

Answer 20

90 degrees

Question 21

Different materials of piping in a DWV System can be joined together using a(n)

Answer 21

Adapter

Question 22

What fitting has internal threads on the branch fitting to accept a threaded plug?

Answer 22

Cleanout

Question 23

For branches that run horizontal to vertical use a(n)

Answer 23

Sanitary Tee

Question 24

What fitting is used to enlarge the diameter of vent stacks?

Answer 24

Sanitary Increaser

Question 25

What do drainage and waste systems depend on to move solid and liquid waste through the pipes?

Answer 25

Gravity

Question 26

What is the main horizontal drain pipe located inside a building called?

Answer 26

Building Drain

Question 27

Fittings that work as removable plugs used to provide access to the inside of DWV piping are called...

Answer 27

Cleanouts

Question 28

What is the drainage piping that goes from the buildings foundation to the sewer main or septic tank(private waste disposal system)?

Answer 28

Building Sewer

Question 29

What settles out of the water in a septic tank?

Answer 29

Sludge

Question 30

True or False: Plumbing codes do not vary among jurisdictions.

Answer 30

False