Pipefitter Contractor Exam –Test Questions And
Correct Answers (100% Verified Answers) With
Rationales | Latest Update 2026/2027 | Guaranteed
Pass.
1. What is the primary purpose of a pipefitter?
A. To design building layouts
B. To install, assemble, and maintain piping systems
C. To manage construction schedules
D. To inspect electrical wiring
Pipefitters specialize in the assembly and maintenance of piping
systems for industrial and commercial applications.
2. Which of the following materials is most commonly used for
highpressure steam lines?
A. PVC
B. Copper
C. Carbon steel
D. PEX
Carbon steel is suitable for high-pressure and high-temperature
steam applications.
4. The abbreviation “NPT” stands for:
A. Nominal Pipe Tolerance
B. National Pipe Thread
C. National Pressure Tube
D. Normal Pressure Thread
“NPT” identifies standardized tapered threads used for pipe
fittings.
,5. Which method is best for joining copper pipes in hydronic
systems?
A. Compression fittings
B. Soldering
C. Welding
D. Threading
Soldering ensures leakproof, durable joints for copper piping in
hydronic systems.
6. What is used to prevent galvanic corrosion when joining
dissimilar metals? A. Pipe sealant
B. Teflon tape
C. Dielectric union
D. Brazing flux
A. dielectric union isolates metals electrically, preventing galvanic
corrosion.
7. What is the minimum slope required for a horizontal drain
pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 3/8 inch per foot
1/4 inch per foot ensures proper drainage and flow velocity.
8. Which tool is used to align pipe flanges before bolting?
A. Chain wrench
B. Flange spreader
C. Pipe vise
D. Torque wrench
Flange spreaders safely align flanges for bolting without damaging
the gasket.
, 9. Which fitting allows a change in pipe diameter?
A. Elbow
B. Tee
C. Reducer
D. Coupling
A reducer connects two pipes of different diameters.
10. What type of valve provides the best throttling control?
A. Gate valve
B. Globe valve
C. Ball valve
D. Check valve
Globe valves are designed for precise flow regulation.
11. What color represents oxygen piping in an industrial setting?
A. Red
B. Green
C. Blue
D. Yellow
Blue typically denotes oxygen lines per standard color codes.
3. When threading steel pipe, which tool is used to cut external
threads? A. Reamer
B. Pipe die
C. Tap wrench
D. Tube cutter
A pipe die creates the external threads necessary for threaded
connections.
12. What is the purpose of pipe hangers and supports?
Correct Answers (100% Verified Answers) With
Rationales | Latest Update 2026/2027 | Guaranteed
Pass.
1. What is the primary purpose of a pipefitter?
A. To design building layouts
B. To install, assemble, and maintain piping systems
C. To manage construction schedules
D. To inspect electrical wiring
Pipefitters specialize in the assembly and maintenance of piping
systems for industrial and commercial applications.
2. Which of the following materials is most commonly used for
highpressure steam lines?
A. PVC
B. Copper
C. Carbon steel
D. PEX
Carbon steel is suitable for high-pressure and high-temperature
steam applications.
4. The abbreviation “NPT” stands for:
A. Nominal Pipe Tolerance
B. National Pipe Thread
C. National Pressure Tube
D. Normal Pressure Thread
“NPT” identifies standardized tapered threads used for pipe
fittings.
,5. Which method is best for joining copper pipes in hydronic
systems?
A. Compression fittings
B. Soldering
C. Welding
D. Threading
Soldering ensures leakproof, durable joints for copper piping in
hydronic systems.
6. What is used to prevent galvanic corrosion when joining
dissimilar metals? A. Pipe sealant
B. Teflon tape
C. Dielectric union
D. Brazing flux
A. dielectric union isolates metals electrically, preventing galvanic
corrosion.
7. What is the minimum slope required for a horizontal drain
pipe?
A. 1/8 inch per foot
B. 1/4 inch per foot
C. 1/2 inch per foot
D. 3/8 inch per foot
1/4 inch per foot ensures proper drainage and flow velocity.
8. Which tool is used to align pipe flanges before bolting?
A. Chain wrench
B. Flange spreader
C. Pipe vise
D. Torque wrench
Flange spreaders safely align flanges for bolting without damaging
the gasket.
, 9. Which fitting allows a change in pipe diameter?
A. Elbow
B. Tee
C. Reducer
D. Coupling
A reducer connects two pipes of different diameters.
10. What type of valve provides the best throttling control?
A. Gate valve
B. Globe valve
C. Ball valve
D. Check valve
Globe valves are designed for precise flow regulation.
11. What color represents oxygen piping in an industrial setting?
A. Red
B. Green
C. Blue
D. Yellow
Blue typically denotes oxygen lines per standard color codes.
3. When threading steel pipe, which tool is used to cut external
threads? A. Reamer
B. Pipe die
C. Tap wrench
D. Tube cutter
A pipe die creates the external threads necessary for threaded
connections.
12. What is the purpose of pipe hangers and supports?
