Plumbing Contractor Exam (C-36) Actual
Exam and Practice Tests Newest with
Complete Questions and Correct
Detailed Answers| Brand New Version!
1. The primary purpose of a plumbing trap is to:
A. Increase water pressure
B. Prevent sewer gases from entering a building
C. Filter drinking water
D. Store wastewater
Answer: B
Rationale: A trap holds a water seal that blocks sewer gases.
2. DWV stands for:
A. Drain, Waste, and Vent
B. Domestic Water Valve
C. Drain Water Volume
D. Distribution Water Vent
Answer: A
Rationale: DWV refers to the drainage, waste, and venting system.
3. The purpose of a plumbing vent is to:
A. Heat water
B. Equalize air pressure in the drainage system
C. Increase pipe size
D. Store water
Answer: B
Rationale: Vents allow air movement to maintain proper drainage.
4. A water hammer is caused by:
A. Low water temperature
B. Sudden stopping of water flow
,C. Pipe corrosion
D. Excessive venting
Answer: B
Rationale: Rapid valve closure can create a pressure surge.
5. Copper tubing Type L is commonly identified by:
A. Red markings
B. Green markings
C. Blue markings
D. Yellow markings
Answer: C
Rationale: Type L copper tubing is identified with blue lettering.
6. PVC stands for:
A. Polyvinyl Chloride
B. Plastic Vent Connector
C. Pressure Valve Connector
D. Poly Vent Compound
Answer: A
Rationale: PVC is a widely used plastic piping material.
7. The unit used to measure water pressure is:
A. GPM
B. PSI
C. BTU
D. CFM
Answer: B
Rationale: Water pressure is measured in pounds per square inch.
8. A fixture unit is used to estimate:
A. Pipe color
B. Plumbing load demand
C. Water temperature
D. Pipe weight
, Answer: B
Rationale: Fixture units help size plumbing systems.
9. The purpose of a cleanout is to:
A. Increase pressure
B. Provide access for cleaning drains
C. Store water
D. Vent the system
Answer: B
Rationale: Cleanouts allow maintenance and removal of blockages.
10. Galvanized steel pipe is coated with:
A. Copper
B. Zinc
C. Aluminum
D. Brass
Answer: B
Rationale: Zinc coating helps resist corrosion.
11. A backflow preventer is installed to:
A. Increase flow rate
B. Prevent contaminated water from reversing direction
C. Reduce pipe size
D. Store water
Answer: B
Rationale: Backflow prevention protects potable water supplies.
12. Potable water means:
A. Heated water
B. Wastewater
C. Safe drinking water
D. Recycled water
Answer: C
Rationale: Potable water is suitable for human consumption.
Exam and Practice Tests Newest with
Complete Questions and Correct
Detailed Answers| Brand New Version!
1. The primary purpose of a plumbing trap is to:
A. Increase water pressure
B. Prevent sewer gases from entering a building
C. Filter drinking water
D. Store wastewater
Answer: B
Rationale: A trap holds a water seal that blocks sewer gases.
2. DWV stands for:
A. Drain, Waste, and Vent
B. Domestic Water Valve
C. Drain Water Volume
D. Distribution Water Vent
Answer: A
Rationale: DWV refers to the drainage, waste, and venting system.
3. The purpose of a plumbing vent is to:
A. Heat water
B. Equalize air pressure in the drainage system
C. Increase pipe size
D. Store water
Answer: B
Rationale: Vents allow air movement to maintain proper drainage.
4. A water hammer is caused by:
A. Low water temperature
B. Sudden stopping of water flow
,C. Pipe corrosion
D. Excessive venting
Answer: B
Rationale: Rapid valve closure can create a pressure surge.
5. Copper tubing Type L is commonly identified by:
A. Red markings
B. Green markings
C. Blue markings
D. Yellow markings
Answer: C
Rationale: Type L copper tubing is identified with blue lettering.
6. PVC stands for:
A. Polyvinyl Chloride
B. Plastic Vent Connector
C. Pressure Valve Connector
D. Poly Vent Compound
Answer: A
Rationale: PVC is a widely used plastic piping material.
7. The unit used to measure water pressure is:
A. GPM
B. PSI
C. BTU
D. CFM
Answer: B
Rationale: Water pressure is measured in pounds per square inch.
8. A fixture unit is used to estimate:
A. Pipe color
B. Plumbing load demand
C. Water temperature
D. Pipe weight
, Answer: B
Rationale: Fixture units help size plumbing systems.
9. The purpose of a cleanout is to:
A. Increase pressure
B. Provide access for cleaning drains
C. Store water
D. Vent the system
Answer: B
Rationale: Cleanouts allow maintenance and removal of blockages.
10. Galvanized steel pipe is coated with:
A. Copper
B. Zinc
C. Aluminum
D. Brass
Answer: B
Rationale: Zinc coating helps resist corrosion.
11. A backflow preventer is installed to:
A. Increase flow rate
B. Prevent contaminated water from reversing direction
C. Reduce pipe size
D. Store water
Answer: B
Rationale: Backflow prevention protects potable water supplies.
12. Potable water means:
A. Heated water
B. Wastewater
C. Safe drinking water
D. Recycled water
Answer: C
Rationale: Potable water is suitable for human consumption.
