Plumbing Piping: Types, Techniques, and Safety for Construction

Question 1

How do water pressure, flow rate, and pipe sizing interact to affect the performance of a plumbing system?

Accepted Answer

Pipe size should be carefully chosen to provide enough flow rate while minimizing pressure loss and energy use.

Answer

Higher pressure and larger pipes increase flow rate, while higher flow rate and smaller pipes decrease pressure.

Answer

Water pressure stays the same throughout the system, while flow rate is inversely proportional to pipe diameter.

Answer

Flow rate is not affected by water pressure or pipe diameter.

Question 2

Which type of pipe is most appropriate for drainage applications due to its resistance to corrosion and low cost?

Accepted Answer

PVC

Answer

Copper

Answer

Galvanized steel

Answer

Cast iron

Question 3

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

Accepted Answer

To prevent backflow of sewer gases

Answer

To control water pressure

Answer

To support the weight of the pipe

Answer

To collect debris

Question 4

Which pipefitting technique involves the use of a solvent to join pipes, creating a permanent bond?

Accepted Answer

Solvent cementing

Answer

Soldering

Answer

Welding

Answer

Threaded connections

Question 5

What is the primary function of a water hammer arrestor in a plumbing system?

Accepted Answer

To prevent damage from the sudden release of water pressure

Answer

To regulate water flow

Answer

To protect against freezing

Answer

To trap sediment

Question 6

Which material is commonly used to manufacture flexible drain pipes for increased maneuverability and adaptability?

Accepted Answer

Plastic

Answer

Rubber

Answer

Metal

Answer

Wood

Question 7

Which type of valve is specifically designed to allow water to flow in only one direction, preventing backflow?

Accepted Answer

Check valve

Answer

Ball valve

Answer

Gate valve

Answer

Butterfly valve

Question 8

What is the main purpose of a pressure relief valve installed in plumbing systems?

Accepted Answer

To release excessive water pressure, preventing damage to equipment

Answer

To prevent water hammer

Answer

To regulate water temperature

Answer

To trap sediment

Question 9

To achieve precise and effective plumbing pipefitting, what is the correct order of actions?

Accepted Answer

Mark, cut, join, bend

Answer

Cut, join, bend

Answer

Bend, join, cut

Question 10

Which of the following materials is least commonly used for plumbing pipes?

Accepted Answer

Aluminum

Answer

Copper

Answer

Cast iron

Answer

Polyvinyl chloride (PVC)

Question 11

What is the primary purpose of a trap in a plumbing system?

Accepted Answer

To create a seal against sewer gases

Answer

To prevent the flow of water

Answer

To control the temperature of the water

Answer

To support the weight of the pipes

Question 12

Which type of pipe joint creates a permanent connection between two pipes?

Accepted Answer

Soldered joint

Answer

Slip joint

Answer

Compression joint

Answer

Threaded joint

Question 13

Which tool is specifically designed for cutting plastic pipes?

Accepted Answer

Pipe cutter

Answer

Hacksaw

Answer

Tin snips

Answer

Plumber's knife

Question 14

Which type of pipe fitting is used to change the direction of a pipe by 90 degrees?

Accepted Answer

Elbow

Answer

Tee

Answer

Union

Answer

Flange

Question 15

What is the primary purpose of a water hammer arrester in a plumbing system?

Accepted Answer

To prevent damage to pipes from water pressure surges

Answer

To regulate the flow of water

Answer

To reduce noise in plumbing systems

Answer

To protect backflow preventers

Question 16

Which type of valve is commonly used in plumbing systems to control the flow of water?

Accepted Answer

Ball valve

Answer

Gate valve

Answer

Check valve

Answer

Butterfly valve

Question 17

What is the primary function of a faucet in a plumbing system?

Accepted Answer

To control the flow of water

Answer

To mix hot and cold water

Answer

To prevent backflow

Answer

To drain water from a pipe

Question 18

When working with hazardous materials in plumbing, which safety measure is most crucial?

Accepted Answer

Ensuring proper ventilation

Answer

Wearing protective gear only in designated areas

Answer

Storing materials away from sunlight

Answer

Mixing chemicals only with cold water

Question 19

What is the primary purpose of a trap in plumbing piping?

Accepted Answer

To prevent backflow of water and gases

Answer

To collect sediment and debris

Answer

To regulate water flow

Answer

To provide an air gap

Question 20

Which of the following is the most common material used for residential drain lines?

Accepted Answer

PVC

Answer

ABS

Answer

CPVC

Answer

PEX

Question 21

Which tool is primarily used to cut and thread steel pipe?

Accepted Answer

Die stock

Answer

Pipe wrench

Answer

Hacksaw

Answer

Soldering iron

Question 22

What is the key difference between a wet vent and a dry vent?

Accepted Answer

A dry vent ventilates a fixture trap, while a wet vent does not

Answer

A wet vent drains a fixture, while a dry vent does not

Answer

A wet vent is used for sinks only, while a dry vent can be used for any fixture

Answer

There is no difference between a wet vent and a dry vent

Question 23

What is the primary function of a pressure reducing valve in a plumbing system?

Accepted Answer

To regulate and maintain a constant outlet water pressure

Answer

To prevent water hammer

Answer

To reduce noise in the plumbing system

Answer

To protect appliances from high water pressure

Question 24

What is the main advantage of using a slip joint over a threaded joint?

Accepted Answer

Slip joints allow for expansion and contraction, while threaded joints do not

Answer

Threaded joints allow for expansion and contraction, while slip joints do not

Answer

There is no difference between a slip joint and a threaded joint

Answer

Slip joints are used for metal pipes, while threaded joints are used for plastic pipes

Question 25

In plumbing piping, which fitting is used to connect two pipes at a 90-degree angle?

Accepted Answer

Elbow

Answer

Tee

Answer

Union

Answer

Coupling

Question 26

Which type of pipe is commonly used for underground drainage systems?

Accepted Answer

Cast iron

Answer

Copper

Answer

Polypropylene

Answer

Galvanized steel

Question 27

What is the primary purpose of a backflow preventer in a plumbing system?

Accepted Answer

Preventing contaminated water from flowing back into the clean water supply

Answer

Regulating the flow of water through a pipe

Answer

Connecting two pipes of different diameters

Answer

Trapping debris and preventing it from entering the water system

Question 28

Which tool is primarily used to cut pipes to the desired length?

Accepted Answer

Pipe cutter

Answer

Hacksaw

Answer

Grinder

Answer

Drill

Question 29

What type of joint is suitable for connecting two pipes that are not in a straight line?

Accepted Answer

Slip joint

Answer

Soldered joint

Answer

Threaded joint

Answer

Compression joint

Question 30

Which type of pipe is commonly used for transporting both hot and cold water?

Accepted Answer

CPVC

Answer

PE

Answer

PVC

Answer

Galvanized steel

Question 31

When joining copper pipes, which technique is recommended?

Accepted Answer

Soldering

Answer

Welding

Answer

Gluing

Answer

Screwing

Question 32

In a plumbing work environment, what action violates established safety regulations?

Accepted Answer

Smoking during work

Answer

Wearing appropriate safety gear

Answer

Working stably on a ladder

Answer

Handling sharp tools with caution

Question 33

Explain the distinction between a tee fitting and a cross fitting.

Accepted Answer

Tees have three openings, while crosses have four.

Answer

Crosses have three openings, while tees have four.

Answer

Tees are used to branch pipes, while crosses connect four pipes at right angles.

Answer

Tees and crosses are functionally identical.

Question 34

What is the primary purpose of a pressure regulator in a plumbing system?

Accepted Answer

Maintaining consistent water pressure

Answer

Reducing the likelihood of leaks

Answer

Preventing backflow

Answer

Filtering impurities from the water supply

Question 35

What is the primary reason for following building codes when installing plumbing systems?

Accepted Answer

To ensure the safety and functionality of the system

Answer

To enhance the aesthetic appeal of the system

Answer

To avoid potential legal issues

Answer

To reduce the cost of materials

Question 36

What is the primary purpose of a slip joint in a plumbing system?

Accepted Answer

To allow for thermal expansion and contraction without causing strain on the pipe

Answer

To provide a permanent, watertight seal

Answer

To connect pipes of different diameters

Question 37

Which safety regulation mandates that plumbers wear protective clothing and equipment when working with certain chemicals?

Accepted Answer

OSHA's Hazard Communication Standard (HCS)

Answer

International Plumbing Code (IPC)

Answer

American National Standard for Safety in Plumbing and Drainlaying (ANSI Z490.1)

Answer

National Electrical Code (NEC)

Question 38

When cutting PVC pipe using a hacksaw, what technique should be used to ensure a square cut and prevent crushing the pipe?

Accepted Answer

Use a miter box for support

Answer

Use a pipe cutter to create a clean and precise cut

Answer

Cut the pipe freehand without any support

Question 39

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

Accepted Answer

To prevent sewer gases from entering the building

Answer

To provide a vent for the drainage system

Answer

To collect debris and prevent clogs

Answer

To regulate water pressure

Question 40

Which of the following is NOT an advantage of using PEX piping in residential plumbing?

Accepted Answer

Susceptibility to freezing damage

Answer

Corrosion resistance

Answer

Reduced noise levels

Answer

Flexibility and ease of installation

Question 41

What is the primary purpose of a union fitting in a plumbing system?

Accepted Answer

To allow for easy removal and reinstallation of a pipe section

Answer

To connect pipes of different diameters

Answer

To change the direction of a pipe run

Question 42

Which gas type requires a yellow pipe marking in accordance with industry safety standards?

Accepted Answer

Natural gas

Answer

Oxygen

Answer

Propane

Answer

Butane

Question 43

Before soldering a copper joint, what essential step should be taken to prepare the surfaces?

Accepted Answer

Clean and apply flux to the pipe and fitting

Answer

Heat the joint

Answer

Insert the pipe into the fitting

Answer

Apply solder paste to the joint

Question 44

Which specialized tool is commonly used to bend metal conduit accurately to meet installation requirements?

Accepted Answer

Conduit bender

Answer

Hacksaw

Answer

Pipe wrench

Answer

Level

Question 45

What is the primary purpose of using a primer on PVC pipes before gluing them together?

Accepted Answer

To enhance the adhesion of the glue

Answer

To waterproof the joint

Answer

To lubricate the pipe

Answer

To remove dirt and debris

Question 46

What is the primary purpose of a drain-waste-vent (DWV) system in plumbing?

Accepted Answer

To eliminate wastewater and vent gases from the plumbing system.

Answer

To provide pressure for water flow

Answer

To regulate water temperature

Question 47

When working with plumbing pipes, which safety precaution is essential?

Accepted Answer

Wear safety glasses and gloves.

Answer

Disregard warning labels on chemicals

Answer

Work near open flames without proper ventilation

Answer

Use a ladder without a safety harness

Question 48

When installing a new water heater, what type of pipe is generally used to connect it to the main water supply?

Accepted Answer

Copper or PEX

Answer

PVC

Answer

ABS

Answer

Cast iron

Question 49

What is the main function of a trap in a plumbing system?

Accepted Answer

Preventing sewer gases from entering the building

Answer

Regulating water flow

Answer

Increasing water pressure

Answer

Filtering water

Question 50

Which pipe material is known for its resistance to corrosion?

Accepted Answer

Copper

Answer

Cast iron

Answer

ABS

Answer

PVC

Question 51

What is the function of a water pressure regulator in a plumbing system?

Accepted Answer

Maintaining consistent water pressure throughout the system

Answer

Increasing water pressure

Answer

Filtering water