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

A water supply system delivers clean and potable water to various fixtures within a building, ensuring accessibility for daily use.

Question 2

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

Accepted Answer

Backflow preventer

Answer

A backflow preventer ensures that contaminated water does not flow back into the potable water supply, maintaining water quality and safety.

Question 3

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

Accepted Answer

1/4 inch per foot

Answer

A horizontal drainpipe should be sloped at 1/4 inch per foot to ensure proper wastewater flow and prevent blockages.

Question 4

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

Accepted Answer

PVC

Answer

PVC pipes are widely used for drainage systems due to their lightweight, corrosion resistance, and ease of installation.

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

A vent pipe allows sewer gases to escape safely and ensures proper air circulation, preventing traps from being siphoned dry.

(PC) Plumber Certification Practice Test