Types of Plumbing Systems: Water Supply, Drainage, and Gas Piping

Question 1

Which plumbing system is designed to drain rainwater away from a building?

Accepted Answer

Drainage System

Answer

Water Supply System

Answer

Gas Piping System

Question 2

What is the main purpose of a trap in a drainage system?

Accepted Answer

To create a water seal

Answer

To prevent clogging

Answer

To prevent backflow

Answer

To provide ventilation

Question 3

What is the minimum slope required for drain pipes to ensure proper drainage, expressed as a fraction of an inch per foot?

Accepted Answer

1/4

Answer

1/2

Answer

1

Answer

2

Question 4

Which of the following is NOT considered a plumbing fixture?

Accepted Answer

Refrigerator

Answer

Toilet

Answer

Sink

Answer

Dishwasher

Question 5

What is the primary function of a water heater in a residential plumbing system?

Accepted Answer

To heat water for bathing, cooking, and other domestic uses

Answer

To circulate hot water throughout the home

Answer

To store hot water for later use

Answer

To prevent freezing of water pipes

Question 6

What type of pipe joint is commonly used to connect copper pipes in residential plumbing?

Accepted Answer

Soldered joint

Answer

Compression fitting

Answer

Threaded joint

Answer

Flared joint

Question 7

What is the purpose of a pressure-reducing valve in a plumbing system?

Accepted Answer

To reduce water pressure to protect fixtures and appliances

Answer

To maintain constant water pressure

Answer

To prevent water damage

Answer

To increase water flow

Question 8

Which type of plumbing system is typically used in larger buildings with multiple stories?

Accepted Answer

Two-pipe system

Answer

One-pipe system

Answer

Single-stack system

Answer

Loop system

Question 9

What is the correct order of steps to install a water supply line?

Accepted Answer

Measure, cut, assemble, connect

Answer

Assemble, measure, cut, connect

Answer

Cut, assemble, connect, measure

Answer

Connect, measure, cut, assemble

Question 10

Which water supply system employs a pressurized tank to distribute water within a building?

Accepted Answer

Hydropneumatic system

Answer

Constant pressure system

Answer

Gravity-fed system

Answer

Booster system

Question 11

Which type of pipe is typically utilized for the distribution of water in domestic plumbing systems?

Accepted Answer

Copper

Answer

Galvanized steel

Answer

PVC

Answer

ABS

Question 12

In a drainage system, what is the primary function of a trap?

Accepted Answer

Preventing sewer gases from entering the building

Answer

Collecting and retaining water

Answer

Regulating the flow of waste

Answer

Filtering out debris

Question 13

In drainage pipes, what is the minimum required slope to ensure proper flow?

Accepted Answer

1/4 inch per foot

Answer

1/2 inch per foot

Answer

1 inch per foot

Answer

2 inches per foot

Question 14

Which type of fitting is employed to alter the direction of a pipe?

Accepted Answer

Elbow

Answer

Tee

Answer

Cross

Answer

Reducer

Question 15

What is the purpose of a pressure-reducing valve in a plumbing system?

Accepted Answer

Decreasing water pressure

Answer

Increasing water pressure

Answer

Regulating water flow

Answer

Preventing water leaks

Question 16

In a plumbing system, what is the function of a vent stack?

Accepted Answer

Releasing sewer gases

Answer

Providing fresh air to drains

Answer

Regulating water pressure

Answer

Filtering out debris

Question 17

Which type of pipe joint offers the highest strength and permanence?

Accepted Answer

Soldered

Answer

Crimped

Answer

Threaded

Answer

Glued

Question 18

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

Accepted Answer

Preventing water from flowing in the wrong direction

Answer

Increasing water pressure

Answer

Regulating water flow

Answer

Filtering out debris

Question 19

Which of the following is **NOT** a fundamental component of a water supply system?

Accepted Answer

Electrical wiring

Answer

Pipes

Answer

Valves

Answer

Fixtures

Question 20

In a gas piping system, what do we call the device that controls the flow of gas?

Accepted Answer

Valve

Answer

Regulator

Answer

Meter

Answer

Fitting

Question 21

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

Accepted Answer

To effectively prevent water from flowing backwards into the water supply

Answer

To regulate water pressure

Answer

To act as a crucial safety valve

Answer

To protect against leaks

Question 22

According to plumbing codes, what is the minimum acceptable size for a water supply pipe leading to a kitchen sink?

Accepted Answer

3/4 inch

Answer

1/2 inch

Answer

1 inch

Answer

1 1/2 inch

Question 23

What is the critical purpose of incorporating slope into a drainage system?

Accepted Answer

To ensure proper drainage

Answer

To effectively prevent water from backing up

Answer

To facilitate cleaning

Answer

To minimize corrosion

Question 24

Which components are crucial for a water supply system to provide reliable potable water to a single-family home?

Accepted Answer

Water source, Distribution piping, Water treatment system, Fixtures

Answer

Drainage system, Water heater, Fixtures

Answer

Gas piping system, Water softener, Fixtures

Question 25

Which of the following is NOT a primary function of a water supply system in a building?

Accepted Answer

To remove wastewater and sewage from the building

Answer

To provide potable water to fixtures and appliances

Answer

To supply hot water for various uses

Question 26

Which material is primarily used for drainage pipes in most residential and commercial buildings?

Accepted Answer

PVC (Polyvinyl chloride)

Answer

Cast iron

Answer

Copper

Answer

Galvanized steel

Question 27

Which type of valve is commonly used to control water flow to a sink?

Accepted Answer

Ball valve

Answer

Check valve

Answer

Gate valve

Answer

Pressure-reducing valve

Question 28

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

Accepted Answer

To prevent contaminated water from flowing back into the clean water supply

Answer

To regulate the flow of water to a particular fixture or appliance

Question 29

Which of the following plumbing systems is responsible for providing water to fixtures and appliances throughout a building?

Accepted Answer

Water supply system

Answer

Ventilation system

Answer

Gas piping system

Answer

Drainage system

Question 30

What is the main function of a drainage system in a residential plumbing system?

Accepted Answer

To remove wastewater, sewage, and other liquid waste from buildings and dispose of it safely

Answer

To supply potable water to fixtures and appliances

Answer

To provide fresh air ventilation to indoor spaces

Answer

To distribute natural gas to appliances and equipment

Question 31

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

Accepted Answer

To prevent sewer gases and foul odors from entering the building's interior

Answer

To block the flow of water or waste in the drainpipe

Answer

To store water or waste for future use or disposal

Answer

To filter out contaminants or debris from wastewater

Question 32

Which pipe fitting is typically used to change the direction of a pipe by 90 degrees in a plumbing system?

Accepted Answer

Elbow

Answer

Cross

Answer

T-joint

Answer

Union

Question 33

Which type of valve in a plumbing system is used to control and regulate the flow of hot and cold water in a shower?

Accepted Answer

Pressure balance valve

Answer

Check valve

Answer

Globe valve

Answer

Gate valve

Question 34

What is the purpose of an expansion tank in a water heater system?

Accepted Answer

To accommodate the expansion of heated water and prevent excessive pressure buildup

Answer

To store hot water for later use, reducing energy consumption

Answer

To filter out sediment and impurities from the water supply

Question 35

In a plumbing system, which type of system employs pressurized air to evacuate human waste and wastewater?

Accepted Answer

Vacuum drainage system

Answer

Gravity drainage system

Answer

Septic tank system

Answer

Ejector pump system

Question 36

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

Accepted Answer

To prevent the backflow of contaminated water or fluids into the clean water supply

Answer

To regulate the pressure of water flowing through the system

Answer

To filter out sediment and debris from incoming water

Question 37

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

Accepted Answer

Prevent sewer gases from entering the building

Answer

Provide a cleanout point

Answer

Filter out solid waste

Question 38

Which type of gas piping offers the highest level of flexibility?

Accepted Answer

Corrugated stainless steel tubing (CSST)

Answer

Black iron pipe

Answer

Copper pipe

Question 39

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

Accepted Answer

Regulate water pressure to protect fixtures and appliances

Answer

Increase water temperature

Answer

Prevent backflow

Question 40

Which type of plumbing fixture typically includes a basin or bowl for washing hands?

Accepted Answer

Lavatory

Answer

Shower

Answer

Faucet

Answer

Toilet

Question 41

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

Accepted Answer

Provide access for clearing clogs and obstructions

Answer

Prevent backflow

Answer

Ventilate the system

Answer

Connect different drain lines

Question 42

For natural gas appliances with high flow rate demands, which type of connection is generally recommended?

Accepted Answer

Rigid pipe connection

Answer

Flexible hose connection

Answer

Quick-connect fitting

Question 43

Which type of drain line is specifically designed to carry waste from fixtures such as toilets and urinals?

Accepted Answer

Soil stack

Answer

Vent stack

Answer

Waste stack

Answer

Drain line

Question 44

What is the primary reason for installing a backflow preventer in a plumbing system?

Accepted Answer

Prevent contaminated water from entering the clean water supply

Answer

Control water temperature

Answer

Increase water pressure

Question 45

What type of plumbing system, commonly found in older homes, uses a single pipe for both water supply and drainage?

Accepted Answer

Single-pipe system

Answer

Branch system

Answer

Continuous vent system

Answer

Two-pipe system

Question 46

What is the main advantage of a two-pipe plumbing system compared to a single-pipe system?

Accepted Answer

Reduced risk of contamination between clean water supply and wastewater

Answer

Increased water pressure

Answer

Lower installation cost

Question 47

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

Accepted Answer

To prevent siphoning and maintain air pressure in the drainage system

Answer

To carry wastewater directly to the sewer

Answer

To increase water pressure in the supply system

Question 48

A building with multiple floors typically uses which type of water supply system to ensure adequate water pressure on upper floors?

Accepted Answer

Upfeed system

Answer

Downfeed system

Answer

Branch system

Answer

Loop system

Question 49

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

Accepted Answer

To prevent sewer gases from entering the building

Answer

To provide a connection to the vent pipe

Answer

To filter out impurities in water

Answer

To regulate water flow to fixtures

Question 50

What plumbing system is often used in commercial buildings to provide separate supply lines for hot and cold water?

Accepted Answer

Two-pipe system

Answer

Continuous vent system

Answer

Branch system

Answer

Single-pipe system

Question 51

When installing a new plumbing fixture, what is the very first step you should take?

Accepted Answer

Shut off the water supply

Answer

Install the fixture

Answer

Test for leaks

Answer

Connect the drain pipe

Question 52

What type of plumbing system features a single main pipe that branches out to connect individual fixtures?

Accepted Answer

Branch system

Answer

Loop system

Answer

Single-pipe system