Drainage Pipes and Fittings: Comprehensive Guide for Plumbing Professionals

Question 1

What is the primary purpose of a P-trap in a drainage system?

Accepted Answer

To create a water seal and block sewer gases

Answer

To prevent clogs by trapping debris

Answer

To control the flow rate of wastewater

Question 2

In the installation of a sanitary tee fitting, what substance should be applied initially?

Accepted Answer

Primer

Answer

Cement

Answer

Water

Question 3

For underground drainage systems, which pipe material is ideal due to its durability and resistance to corrosion?

Accepted Answer

Cast Iron

Answer

PVC

Answer

ABS

Answer

CPVC

Question 4

In a drainage system, which fitting is used to change the direction of a pipe run by a right angle (90 degrees)?

Accepted Answer

Elbow

Answer

Coupling

Answer

Reducer

Answer

Tee

Question 5

In a drainage system, what is the purpose of a cleanout fitting?

Accepted Answer

To provide access for cleaning and maintenance

Answer

To reduce the flow rate of wastewater

Answer

To trap sediment and debris

Answer

To regulate air pressure in the system

Question 6

When choosing a drainage pipe material, which factor should be considered to ensure resistance to high temperatures?

Accepted Answer

Melting point

Answer

Diameter

Answer

Wall thickness

Answer

Flow rate

Question 7

Which type of fitting is used to join pipes of different diameters?

Accepted Answer

Reducer

Answer

Tee

Answer

Elbow

Answer

Cleanout

Question 8

What is the primary function of a vent pipe in a drainage system?

Accepted Answer

To allow air to enter and equalize pressure within the system

Answer

To discharge wastewater

Answer

To prevent clogging

Answer

To trap odors

Question 9

Which fitting is used to create a branch connection in a drainage system?

Accepted Answer

Tee

Answer

Elbow

Answer

Coupling

Answer

Reducer

Question 10

Which type of pipe is most commonly utilized for drainage purposes in residential buildings?

Accepted Answer

PVC (Polyvinyl Chloride)

Answer

HDPE (High-Density Polyethylene)

Answer

Copper

Answer

PEX (Cross-linked Polyethylene)

Question 11

What is the primary purpose of a cleanout fitting in a drainage system?

Accepted Answer

To facilitate cleaning and maintenance by providing access points

Answer

To prevent backflow of wastewater

Answer

To reduce the flow rate of wastewater

Answer

To connect pipes at a right angle

Question 12

Which type of joint is predominantly used to connect PVC drainage pipes?

Accepted Answer

Solvent weld

Answer

Flared

Answer

Compression

Answer

Threaded

Question 13

Which fitting is commonly used to connect a drainage pipe to a horizontal drain line?

Accepted Answer

Sanitary tee

Answer

Cross

Answer

Elbow

Answer

Trap

Question 14

What is the primary function of a trap in a drainage system?

Accepted Answer

To create a water seal that prevents sewer gases from entering the building

Answer

To reduce noise from the drainage system

Answer

To increase the flow rate of wastewater

Question 15

Which material is commonly used in the production of flexible drainage pipes?

Accepted Answer

Polyethylene

Answer

Copper

Answer

PVC

Question 16

What is the maximum allowable distance between cleanouts in a drainage system?

Accepted Answer

50 feet

Answer

75 feet

Answer

25 feet

Answer

100 feet

Question 17

Which factor is crucial when determining the appropriate diameter for a drainage pipe?

Accepted Answer

Flow rate and fixture unit count

Answer

Pipe length

Answer

Pipe material

Answer

Slope of the pipe

Question 18

What is the primary purpose of a vent in a drainage system?

Accepted Answer

To provide an air supply and prevent siphoning

Answer

To reduce pressure in the system

Answer

To prevent clogging

Question 19

Which type of drainage pipe is primarily used for vertical drainage lines and can withstand high temperatures and mechanical stress?

Accepted Answer

Cast iron soil pipe

Answer

Polyvinyl chloride (PVC) pipe

Answer

Corrugated plastic pipe

Question 20

What is the specific role of a drain shoe in a plumbing system?

Accepted Answer

To support the weight of the drainage pipe and prevent sagging

Answer

To connect two sections of drainage pipe

Answer

To prevent water leakage from the pipe

Question 21

Which type of joint is specifically designed for connecting cast iron soil pipes?

Accepted Answer

Hub and spigot joint

Answer

Slip joint

Answer

Soldered joint

Answer

Compression joint

Question 22

Which material is NOT commonly used for drainage fittings due to its high cost and limited availability?

Accepted Answer

Brass

Answer

ABS

Answer

PVC

Answer

Cast iron

Question 23

What is the main purpose of installing a trap in a plumbing system?

Accepted Answer

To create a water seal that prevents sewer gases from entering the building

Answer

To collect and hold debris

Answer

To change the direction of the drainage pipe

Answer

To increase the flow rate of water

Question 24

Which type of drainage pipe is highly flexible and ideal for use in tight spaces and around obstacles?

Accepted Answer

Corrugated plastic pipe

Answer

Cast iron soil pipe

Answer

Copper pipe

Answer

PVC pipe

Question 25

Which type of drainage fitting is specifically designed to provide access for cleaning and unclogging drainage lines?

Accepted Answer

Screw-type cleanout

Answer

Drain shoe

Answer

Vent stack

Answer

S trap

Question 26

What is the specific function of a sanitary tee fitting in a drainage system?

Accepted Answer

To allow the connection of a branch drainage line to a main line, providing access for cleaning through a removable plug

Answer

To change the direction of a drainage pipe

Answer

To support the weight of a drainage pipe

Question 27

What type of fitting connects two drainage pipes at a 90-degree angle, allowing for a change in direction?

Accepted Answer

Elbow

Answer

Reducer

Answer

Cross

Answer

Tee

Question 28

What is the main function of a cleanout plug in a drainage system?

Accepted Answer

Providing access for cleaning or unclogging the drainage system.

Answer

Changing the direction of the drainage pipe.

Answer

Connecting two drainage pipes of different diameters.

Question 29

Which type of joint is traditionally used to connect cast iron drainage pipes, providing a strong and durable seal?

Accepted Answer

Oakum and molten lead

Answer

Compression fittings

Answer

Solvent cement

Answer

Threaded connections

Question 30

What is the term for a vertical pipe that carries waste and wastewater from bathroom fixtures, typically located inside a wall?

Accepted Answer

Soil stack

Answer

Rain gutter

Answer

Vent stack

Answer

Downspout

Question 31

According to industry standards, what is the recommended slope per foot for drainage pipes to ensure proper flow and prevent clogging?

Accepted Answer

1/4 inch per foot

Answer

1/2 inch per foot

Answer

1 inch per foot

Answer

1/8 inch per foot

Question 32

What type of fitting is specifically designed to reduce the diameter of a drainage pipe, allowing for a transition to a smaller pipe size?

Accepted Answer

Reducer

Answer

Tee

Answer

Branch

Answer

Coupling

Question 33

What type of drain pipe is most commonly used for waste and vent lines in residential plumbing systems in the United States?

Accepted Answer

ABS plastic

Answer

Copper

Answer

Cast iron

Answer

Galvanized steel

Question 34

What is the main function of a P-trap in a drainage system?

Accepted Answer

To prevent sewer gases from entering the building

Answer

To collect sediment

Answer

To regulate water flow

Answer

To increase water pressure

Question 35

What is the purpose of a cleanout in a drainage system?

Accepted Answer

To provide access for cleaning or inspection of the drain line

Answer

To prevent backflow

Answer

To connect to the vent system

Answer

To regulate water flow

Question 36

What is the minimum slope required for a drain pipe to ensure proper gravity flow?

Accepted Answer

1/4 inch per foot

Answer

1 inch per foot

Answer

1/8 inch per foot

Answer

1/2 inch per foot

Question 37

Which type of drain pipe is best suited for underground applications?

Accepted Answer

PVC

Answer

Copper

Answer

Cast iron

Answer

Galvanized steel

Question 38

What is the primary purpose of a vent stack in a drainage system?

Accepted Answer

To prevent siphoning of water from traps

Answer

To regulate water flow

Answer

To increase water pressure

Answer

To collect sediment

Question 39

What is the purpose of a vent stack in a drainage system?

Accepted Answer

To allow air to enter the system, preventing pressure imbalances and ensuring proper drainage.

Answer

To regulate water flow

Answer

To increase water pressure

Question 40

When installing a new drain pipe, what tool is typically used to cut ABS plastic pipe?

Accepted Answer

Saw designed for ABS plastic

Answer

Tin snips

Answer

Pipe cutter

Answer

Hacksaw

Question 41

Which type of drainage pipe is most commonly used for underground sewer lines due to its high impact resistance and durability?

Accepted Answer

PVC (Polyvinyl Chloride)

Answer

ABS (Acrylonitrile Butadiene Styrene)

Answer

Cast Iron

Answer

Copper

Question 42

What is the primary purpose of a cleanout fitting in a drainage system?

Accepted Answer

To provide access for cleaning or inspecting the pipe.

Answer

To connect different pipe sizes.

Answer

To change the direction of the pipe.

Question 43

Which type of fitting is used to connect two pipes at a 90-degree angle?

Accepted Answer

Elbow

Answer

Tee

Answer

Coupling

Question 44

What is the minimum slope required for a 4-inch diameter drainage pipe to ensure proper gravity flow?

Accepted Answer

1/4 inch per foot

Answer

1/8 inch per foot

Answer

1/2 inch per foot

Answer

1 inch per foot

Question 45

Which type of drainage pipe is typically used for venting a plumbing system?

Accepted Answer

PVC (Polyvinyl Chloride)

Answer

Copper

Answer

ABS (Acrylonitrile Butadiene Styrene)

Answer

Cast Iron

Question 46

What is the primary function of a trap in a drainage system?

Accepted Answer

To prevent sewer gases from entering the building.

Answer

To regulate water flow.

Answer

To connect different pipe sizes.

Answer

To provide access for cleaning.

Question 47

Which of the following is a common method for joining PVC drainage pipes?

Accepted Answer

Solvent welding

Answer

Soldering

Answer

Compression fittings

Answer

Threaded connections

Question 48

What is the purpose of a vent stack in a drainage system?

Accepted Answer

To allow air to enter the system, preventing siphoning and maintaining proper pressure.

Answer

To connect different pipe sizes.

Answer

To regulate water flow.

Question 49

Which type of fitting is used to connect a drainage pipe to a vent stack?

Accepted Answer

Wye fitting

Answer

Union

Answer

Tee

Answer

Elbow

Question 50

What is the main consideration when choosing the size of a drainage pipe?

Accepted Answer

The volume of wastewater it needs to carry.

Answer

The material of the pipe.

Answer

The length of the pipe.

Answer

The type of fittings used.