NCCER Pipefitting Certification Exam
Newest 2026 Updated Practice Exam |
100 Most Tested Questions Collection &
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1. Which tool is primarily used to measure the inside diameter of a pipe?
A. Micrometer
B. Caliper
C. Inside caliper
D. Tape measure
Correct Answer: Inside caliper ✔
Rationale: An inside caliper is specifically designed to measure the internal
diameter of pipes accurately.
2. What is the main purpose of pipe reaming?
A. Increase pipe length
B. Remove internal burrs
C. Paint pipe surface
D. Thread pipe ends
Correct Answer: Remove internal burrs ✔
Rationale: Reaming removes sharp edges and burrs left after cutting,
ensuring safe and smooth flow.
3. Which fitting is used to change pipe direction 90 degrees?
A. Tee
B. Coupling
C. Elbow
, D. Reducer
Correct Answer: Elbow ✔
Rationale: A 90-degree elbow changes the direction of flow in piping
systems.
4. What does NPS stand for in pipe sizing?
A. Nominal Pipe Size
B. Normal Pressure System
C. National Pipe Standard
D. Net Pipe Strength
Correct Answer: Nominal Pipe Size ✔
Rationale: NPS refers to the standardized pipe size designation.
5. Which thread type is commonly used in the United States for pipe fittings?
A. BSP
B. NPT
C. Metric thread
D. ACME
Correct Answer: NPT ✔
Rationale: National Pipe Thread (NPT) is the standard tapered thread used
in U.S. piping systems.
6. What is the primary function of a pipe coupling?
A. Change direction
B. Join two straight pipes
C. Reduce pipe size
D. Stop flow
Correct Answer: Join two straight pipes ✔
Rationale: A coupling connects two pipe sections of the same diameter.
7. Which material is most commonly used for high-pressure steam lines?
A. PVC
B. Copper
C. Carbon steel
, D. Aluminum
Correct Answer: Carbon steel ✔
Rationale: Carbon steel withstands high temperature and pressure
conditions.
8. What is pipe schedule primarily used to indicate?
A. Pipe color
B. Pipe strength and wall thickness
C. Pipe length
D. Pipe coating
Correct Answer: Pipe strength and wall thickness ✔
Rationale: Schedule number defines wall thickness and pressure capacity.
9. Which safety device prevents overpressure in piping systems?
A. Valve
B. Strainer
C. Relief valve
D. Trap
Correct Answer: Relief valve ✔
Rationale: A pressure relief valve releases excess pressure to prevent
system failure.
10.What tool is used to cut threaded pipe?
A. Hacksaw
B. Pipe wrench
C. Pipe cutter
D. Chisel
Correct Answer: Pipe cutter ✔
Rationale: A pipe cutter provides clean, square cuts suitable for threading.
11.What is the purpose of pipe insulation?
A. Increase pressure
B. Prevent corrosion only
C. Reduce heat loss or gain
Newest 2026 Updated Practice Exam |
100 Most Tested Questions Collection &
Verified Detailed Answers | Tutor
Verified Success Exam) Graded A+
1. Which tool is primarily used to measure the inside diameter of a pipe?
A. Micrometer
B. Caliper
C. Inside caliper
D. Tape measure
Correct Answer: Inside caliper ✔
Rationale: An inside caliper is specifically designed to measure the internal
diameter of pipes accurately.
2. What is the main purpose of pipe reaming?
A. Increase pipe length
B. Remove internal burrs
C. Paint pipe surface
D. Thread pipe ends
Correct Answer: Remove internal burrs ✔
Rationale: Reaming removes sharp edges and burrs left after cutting,
ensuring safe and smooth flow.
3. Which fitting is used to change pipe direction 90 degrees?
A. Tee
B. Coupling
C. Elbow
, D. Reducer
Correct Answer: Elbow ✔
Rationale: A 90-degree elbow changes the direction of flow in piping
systems.
4. What does NPS stand for in pipe sizing?
A. Nominal Pipe Size
B. Normal Pressure System
C. National Pipe Standard
D. Net Pipe Strength
Correct Answer: Nominal Pipe Size ✔
Rationale: NPS refers to the standardized pipe size designation.
5. Which thread type is commonly used in the United States for pipe fittings?
A. BSP
B. NPT
C. Metric thread
D. ACME
Correct Answer: NPT ✔
Rationale: National Pipe Thread (NPT) is the standard tapered thread used
in U.S. piping systems.
6. What is the primary function of a pipe coupling?
A. Change direction
B. Join two straight pipes
C. Reduce pipe size
D. Stop flow
Correct Answer: Join two straight pipes ✔
Rationale: A coupling connects two pipe sections of the same diameter.
7. Which material is most commonly used for high-pressure steam lines?
A. PVC
B. Copper
C. Carbon steel
, D. Aluminum
Correct Answer: Carbon steel ✔
Rationale: Carbon steel withstands high temperature and pressure
conditions.
8. What is pipe schedule primarily used to indicate?
A. Pipe color
B. Pipe strength and wall thickness
C. Pipe length
D. Pipe coating
Correct Answer: Pipe strength and wall thickness ✔
Rationale: Schedule number defines wall thickness and pressure capacity.
9. Which safety device prevents overpressure in piping systems?
A. Valve
B. Strainer
C. Relief valve
D. Trap
Correct Answer: Relief valve ✔
Rationale: A pressure relief valve releases excess pressure to prevent
system failure.
10.What tool is used to cut threaded pipe?
A. Hacksaw
B. Pipe wrench
C. Pipe cutter
D. Chisel
Correct Answer: Pipe cutter ✔
Rationale: A pipe cutter provides clean, square cuts suitable for threading.
11.What is the purpose of pipe insulation?
A. Increase pressure
B. Prevent corrosion only
C. Reduce heat loss or gain
