Plumber Water & Drainage 1 — Questions and Answers
Question 1: What is the primary function of a water supply system in a building?
- To dispose of wastewater
- To deliver potable water to fixtures (Correct answer)
- To increase water pressure
- To store rainwater only
Correct answer: To deliver potable water to fixtures
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?
- Check valve
- Backflow preventer (Correct answer)
- Pressure gauge
- Drain trap
Correct answer: Backflow preventer
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?
- 1/8 inch per foot
- 1/4 inch per foot (Correct answer)
- 1/2 inch per foot
- No slope required
Correct answer: 1/4 inch per foot
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?
- Copper
- PVC (Correct answer)
- Galvanized steel
- Lead
Correct answer: PVC
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?
- To transport water to fixtures
- To release sewer gases and maintain air pressure (Correct answer)
- To increase water pressure
- To store wastewater
Correct answer: To release sewer gases and maintain air pressure
A vent pipe allows sewer gases to escape safely and ensures proper air circulation, preventing traps from being siphoned dry.
Question 6: Which method is commonly used to prevent clogging in drainage pipes?
- Pouring grease down the drain
- Using drain screens and regular maintenance (Correct answer)
- Avoiding vent pipes
- Increasing water pressure
Correct answer: Using drain screens and regular maintenance
Regular maintenance, such as flushing with hot water and using drain screens, helps prevent debris buildup and clogging in drainage pipes.
Plumber Water & Drainage 1
What is the primary function of a water supply system in a building?