PLUMBING QUESTIONS AND ANSWERS
| LATEST UPDATE | 2024/2025 | RATED
A+
What is the main purpose of a P-trap in plumbing?
✔✔The P-trap prevents sewer gases from entering a building by creating a water seal.
Why is it important to install vent pipes in a plumbing system?
✔✔Vent pipes allow air to enter the plumbing system, preventing vacuum and ensuring proper
drainage.
What is the function of a shut-off valve in plumbing?
✔✔The shut-off valve controls the flow of water, allowing the water supply to be turned on or
off.
What does a water pressure regulator do?
✔✔A water pressure regulator reduces the incoming water pressure to a safe level for the
plumbing system.
1
,What is the standard material used for water supply pipes in modern plumbing?
✔✔The standard material used is typically copper, PVC, or PEX.
How does a water hammer occur?
✔✔A water hammer occurs when the flow of water is suddenly stopped, causing a loud banging
sound in the pipes.
What is a backflow preventer used for?
✔✔A backflow preventer prevents contaminated water from flowing back into the clean water
supply.
What is the main difference between a vent stack and a waste stack?
✔✔A vent stack is used to release air from the plumbing system, while a waste stack carries
wastewater out of the building.
Why is pipe insulation important?
✔✔Pipe insulation helps prevent freezing in cold weather and reduces heat loss in hot water
pipes.
2
,What tool is commonly used to remove a clog in a drain?
✔✔A plumbing snake or auger is commonly used to remove clogs.
What is the purpose of a pressure relief valve in a water heater?
✔✔The pressure relief valve prevents the water heater from over-pressurizing and potentially
exploding.
How does a sump pump protect a home?
✔✔A sump pump removes excess water from a basement or crawl space, preventing flooding.
What is the function of a faucet aerator?
✔✔A faucet aerator mixes air with water to reduce water flow while maintaining water pressure.
What is the purpose of soldering in plumbing?
✔✔Soldering is used to join metal pipes and fittings together by melting a metal alloy to form a
seal.
What is the primary cause of low water pressure in a home?
3
, ✔✔The primary causes are often clogged pipes, leaks, or issues with the water supply.
Why is it necessary to slope drain pipes?
✔✔Drain pipes must be sloped to allow wastewater to flow freely and prevent blockages.
"What ancient roman term refers to an individual who worked in the sanitary field of ancient
Rome?" ✔✔PLUMBARIUS
"What is the title given to a person who is a skilled worker in the field of sanitation?"
✔✔PLUMBER
NPCP refers to: ✔✔NATIONAL PLUMBING CODE OF THE PHILS.
Its complete RA no: ✔✔IRA 1378
What is the meaning of BOD? ✔✔BIOCHEMICAL OXYGEN DEMAND
4
| LATEST UPDATE | 2024/2025 | RATED
A+
What is the main purpose of a P-trap in plumbing?
✔✔The P-trap prevents sewer gases from entering a building by creating a water seal.
Why is it important to install vent pipes in a plumbing system?
✔✔Vent pipes allow air to enter the plumbing system, preventing vacuum and ensuring proper
drainage.
What is the function of a shut-off valve in plumbing?
✔✔The shut-off valve controls the flow of water, allowing the water supply to be turned on or
off.
What does a water pressure regulator do?
✔✔A water pressure regulator reduces the incoming water pressure to a safe level for the
plumbing system.
1
,What is the standard material used for water supply pipes in modern plumbing?
✔✔The standard material used is typically copper, PVC, or PEX.
How does a water hammer occur?
✔✔A water hammer occurs when the flow of water is suddenly stopped, causing a loud banging
sound in the pipes.
What is a backflow preventer used for?
✔✔A backflow preventer prevents contaminated water from flowing back into the clean water
supply.
What is the main difference between a vent stack and a waste stack?
✔✔A vent stack is used to release air from the plumbing system, while a waste stack carries
wastewater out of the building.
Why is pipe insulation important?
✔✔Pipe insulation helps prevent freezing in cold weather and reduces heat loss in hot water
pipes.
2
,What tool is commonly used to remove a clog in a drain?
✔✔A plumbing snake or auger is commonly used to remove clogs.
What is the purpose of a pressure relief valve in a water heater?
✔✔The pressure relief valve prevents the water heater from over-pressurizing and potentially
exploding.
How does a sump pump protect a home?
✔✔A sump pump removes excess water from a basement or crawl space, preventing flooding.
What is the function of a faucet aerator?
✔✔A faucet aerator mixes air with water to reduce water flow while maintaining water pressure.
What is the purpose of soldering in plumbing?
✔✔Soldering is used to join metal pipes and fittings together by melting a metal alloy to form a
seal.
What is the primary cause of low water pressure in a home?
3
, ✔✔The primary causes are often clogged pipes, leaks, or issues with the water supply.
Why is it necessary to slope drain pipes?
✔✔Drain pipes must be sloped to allow wastewater to flow freely and prevent blockages.
"What ancient roman term refers to an individual who worked in the sanitary field of ancient
Rome?" ✔✔PLUMBARIUS
"What is the title given to a person who is a skilled worker in the field of sanitation?"
✔✔PLUMBER
NPCP refers to: ✔✔NATIONAL PLUMBING CODE OF THE PHILS.
Its complete RA no: ✔✔IRA 1378
What is the meaning of BOD? ✔✔BIOCHEMICAL OXYGEN DEMAND
4
