Commercial Plumbing Systems: Types, Components, and Applications

Question 1

In a wet-pipe fire sprinkler system, the pipes are typically:

Accepted Answer

Filled with water under pressure

Answer

Filled with air under pressure

Answer

Empty until the system is activated

Answer

Partially filled with water

Question 2

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

Accepted Answer

Preventing contamination of the water supply from backflow

Answer

Reducing water pressure in the system

Answer

Protecting against flooding caused by excessive water flow

Answer

Improving drainage efficiency

Question 3

In commercial building plumbing, which material is commonly used for water supply piping?

Accepted Answer

Copper due to its durability and corrosion resistance

Answer

Galvanized steel due to its strength and affordability

Answer

PVC due to its lightweight and ease of installation

Answer

Brass due to its resistance to dezincification

Question 4

For joining copper pipes, which soldering technique is recommended?

Accepted Answer

Soft soldering using a lead-free solder alloy

Answer

Hard soldering using a higher melting point solder

Answer

Brazing using a torch and a flux

Answer

Welding using an electric arc

Question 5

What is the primary function of a hydronic heating system?

Accepted Answer

Circulating hot water through pipes to provide heat

Answer

Circulating cold water through pipes to provide cooling

Answer

Removing moisture from the air for humidity control

Answer

Providing ventilation throughout the building

Question 6

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

Accepted Answer

Removing minerals from hard water to prevent scale buildup

Answer

Increasing water pressure for improved flow rates

Answer

Filtering out contaminants and impurities from the water supply

Answer

Preventing corrosion of pipes and fixtures

Question 7

What is the main purpose of a fire sprinkler system in a commercial building?

Accepted Answer

Suppress or extinguish a fire

Answer

Provide water for drinking and sanitation

Answer

Remove excess moisture from the building

Question 8

Which type of sprinkler head is designed to react swiftly to a sharp temperature increase, like in a grease fire?

Accepted Answer

Rate-of-rise sprinkler

Answer

Open sprinkler

Answer

Concealed sprinkler

Answer

Upright sprinkler

Question 9

What type of pipe is most commonly utilized in commercial fire sprinkler systems?

Accepted Answer

Steel

Answer

Copper

Answer

PVC

Answer

Polyethylene cross-linked (PEX)

Question 10

What is the primary purpose of a hydronic heating system?

Accepted Answer

Distributing heat throughout a building via circulated water

Answer

Providing hot water for domestic purposes

Answer

Cooling a building using chilled water circulation

Answer

Supplying compressed air for various tools and equipment

Question 11

Which component of a compressed air system is responsible for removing moisture and impurities from the air?

Accepted Answer

Filter

Answer

Compressor

Answer

Air tank

Answer

Regulator

Question 12

When soldering a copper pipe joint, what is the correct sequence of steps?

Accepted Answer

Clean the pipes' surfaces, apply flux, heat the joint, and finally melt the solder

Answer

Apply flux, heat the joint, clean the pipes' surfaces, and lastly melt the solder

Answer

Heat the joint, apply flux, clean the pipes' surfaces, and then melt the solder

Answer

Clean the pipes' surfaces, heat the joint, melt the solder, and finally apply flux

Question 13

Which type of fitting is employed to alter the direction of a pipe by 90 degrees?

Accepted Answer

Elbow

Answer

Tee

Answer

Cross

Answer

Reducer

Question 14

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

Accepted Answer

To provide support and secure pipes in place

Answer

To prevent water leakage

Answer

To adjust the slope of pipes

Answer

To connect pipes to various fixtures

Question 15

What is the primary purpose of a boiler in a hydronic heating system?

Accepted Answer

Generating heat

Answer

Storing hot water

Answer

Distributing heat

Answer

Regulating water flow

Question 16

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

Accepted Answer

Preventing contaminated water from entering the potable water supply

Answer

Regulating water flow

Answer

Increasing water pressure

Question 17

For underground water distribution lines, which material is commonly used?

Accepted Answer

HDPE

Answer

PVC

Answer

Copper

Answer

Galvanized steel

Question 18

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

Accepted Answer

Reducing excessive water pressure

Answer

Increasing water pressure

Answer

Controlling water flow

Answer

Preventing water leaks

Question 19

Which type of drain is specifically designed for roof drainage?

Accepted Answer

Scupper drain

Answer

French drain

Answer

Grease trap

Answer

Floor drain

Question 20

What is the primary function of a sump pump?

Accepted Answer

Removing excess water from low-lying areas

Answer

Supplying water to sprinkler systems

Answer

Draining water heaters

Answer

Circulating water in swimming pools

Question 21

Which issue is commonly encountered with galvanized steel pipes?

Accepted Answer

Corrosion

Answer

Scaling

Answer

Freezing

Answer

Leaks

Question 22

What is the primary function of a water softener?

Accepted Answer

Removing hardness minerals from water

Answer

Increasing water pressure

Answer

Filtering impurities from water

Answer

Sterilizing water