Plumbing Knowledge Quiz (54 Questions)

What is the minimum pipe diameter for a building sewer?

• 75 mm

• 100 mm

• 150 mm

• 50 mm

What is the required minimum slope for horizontal drainage pipes?

• 1%

• 2%

• 0.5%

• 5%

According to the plumbing code, what is the maximum distance allowed between cleanouts in a horizontal drainage line?

• 10 meters

• 15 meters

• 20 meters

• 5 meters

What type of pipe is commonly used for water supply lines?

• Cast iron

• Galvanized steel

• Copper

• Concrete

What is the minimum depth for underground water service pipes?

• 200 mm

• 300 mm

• 500 mm

• 100 mm

What device is used to prevent backflow in a plumbing system?

• Pressure regulator

• Check valve

• Drain trap

• Cleanout

Which plumbing fixture requires a trap seal of at least 50 mm?

• Bathtub

• Sink

• Floor drain

• Water closet

What is the minimum required air gap for a direct potable water connection?

• Twice the pipe diameter

• One pipe diameter

• Three times the pipe diameter

• Half the pipe diameter

What material is NOT recommended for drain, waste, and vent (DWV) piping?

• PVC

• ABS

• Lead

• Cast iron

What is the standard size of a vent pipe for a toilet fixture?

• 25 mm

• 32 mm

• 50 mm

• 75 mm