Texas Plumbing Apprentice Examination
Review with Answers and Rationales | 100%
Pass Guaranteed | Graded A+
1. What type of pipe is most commonly used for residential water
supply lines?
A. Cast iron
B. Copper
C. PVC Schedule 30
D. Black steel
Copper is widely used for potable water because it is durable,
corrosion-resistant, and safe for drinking water.
2. What is the minimum slope for a horizontal drainage pipe 3
inches or smaller?
A. 1/16 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot
Proper slope ensures waste flows by gravity without clogging or
settling.
3. Which fitting is used to change pipe direction by 90 degrees in
drainage systems?
A. Tee
B. Coupling
C. Long sweep elbow
D. Union
Long sweep elbows reduce flow resistance and prevent clogs in
drainage systems.
,4. What does a P-trap do?
A. Increases water pressure
B. Prevents sewer gases from entering the building
C. Filters debris
D. Boosts drainage speed
The water seal inside a P-trap blocks harmful sewer gases.
5. Which pipe material is approved for underground sewer lines?
A. CPVC
B. Copper
C. PVC Schedule 40
D. PEX
PVC Schedule 40 is commonly approved for underground drainage
and sewer applications.
6. What is the purpose of a vent system?
A. Increase water pressure
B. Allow air into the drainage system
C. Heat water
D. Filter waste
Vent pipes equalize pressure and protect trap seals.
7. What tool is used to cut copper tubing?
A. Hacksaw
B. Pipe wrench
C. Tubing cutter
D. Adjustable wrench
A tubing cutter provides a clean, precise cut without crushing the
pipe.
, 8. What is the maximum water pressure allowed in a building
without a pressure-reducing valve?
A. 60 psi
B. 70 psi
C. 80 psi
D. 100 psi
Texas codes generally limit pressure to 80 psi to protect fixtures and
piping.
9. What type of valve is commonly used to shut off water to a
fixture?
A. Gate valve
B. Check valve
C. Angle stop valve
D. Relief valve
Angle stops allow localized shutoff for maintenance.
10. Which pipe material should NOT be used for hot water lines?
A. Copper
B. CPVC
C. PEX
D. PVC
Standard PVC is not rated for hot water temperatures.
11. What is the purpose of a cleanout?
A. Increase flow speed
B. Provide access for clearing blockages
C. Add pressure
Review with Answers and Rationales | 100%
Pass Guaranteed | Graded A+
1. What type of pipe is most commonly used for residential water
supply lines?
A. Cast iron
B. Copper
C. PVC Schedule 30
D. Black steel
Copper is widely used for potable water because it is durable,
corrosion-resistant, and safe for drinking water.
2. What is the minimum slope for a horizontal drainage pipe 3
inches or smaller?
A. 1/16 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 1 inch per foot
Proper slope ensures waste flows by gravity without clogging or
settling.
3. Which fitting is used to change pipe direction by 90 degrees in
drainage systems?
A. Tee
B. Coupling
C. Long sweep elbow
D. Union
Long sweep elbows reduce flow resistance and prevent clogs in
drainage systems.
,4. What does a P-trap do?
A. Increases water pressure
B. Prevents sewer gases from entering the building
C. Filters debris
D. Boosts drainage speed
The water seal inside a P-trap blocks harmful sewer gases.
5. Which pipe material is approved for underground sewer lines?
A. CPVC
B. Copper
C. PVC Schedule 40
D. PEX
PVC Schedule 40 is commonly approved for underground drainage
and sewer applications.
6. What is the purpose of a vent system?
A. Increase water pressure
B. Allow air into the drainage system
C. Heat water
D. Filter waste
Vent pipes equalize pressure and protect trap seals.
7. What tool is used to cut copper tubing?
A. Hacksaw
B. Pipe wrench
C. Tubing cutter
D. Adjustable wrench
A tubing cutter provides a clean, precise cut without crushing the
pipe.
, 8. What is the maximum water pressure allowed in a building
without a pressure-reducing valve?
A. 60 psi
B. 70 psi
C. 80 psi
D. 100 psi
Texas codes generally limit pressure to 80 psi to protect fixtures and
piping.
9. What type of valve is commonly used to shut off water to a
fixture?
A. Gate valve
B. Check valve
C. Angle stop valve
D. Relief valve
Angle stops allow localized shutoff for maintenance.
10. Which pipe material should NOT be used for hot water lines?
A. Copper
B. CPVC
C. PEX
D. PVC
Standard PVC is not rated for hot water temperatures.
11. What is the purpose of a cleanout?
A. Increase flow speed
B. Provide access for clearing blockages
C. Add pressure
