Plumber Water & Drainage

Question 1

What is the primary function of a water supply system in a building?

Accepted Answer

To deliver potable water to fixtures

Answer

To dispose of wastewater

Answer

To increase water pressure

Answer

To store rainwater only

Question 2

Which component is essential for preventing backflow in a water system?

Accepted Answer

Backflow preventer

Answer

Check valve

Answer

Pressure gauge

Answer

Drain trap

Question 3

What is the standard slope required for proper drainage in a horizontal drainpipe?

Accepted Answer

1/4 inch per foot

Answer

1/8 inch per foot

Answer

1/2 inch per foot

Answer

No slope required

Question 4

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

Accepted Answer

PVC

Answer

Copper

Answer

Galvanized steel

Answer

Lead

Question 5

What is the purpose of a vent pipe in a plumbing system?

Accepted Answer

To release sewer gases and maintain air pressure

Answer

To transport water to fixtures

Answer

To increase water pressure

Answer

To store wastewater

Question 6

Which method is commonly used to prevent clogging in drainage pipes?

Accepted Answer

Using drain screens and regular maintenance

Answer

Pouring grease down the drain

Answer

Avoiding vent pipes

Answer

Increasing water pressure