UA STAR Pipefitter Certification Exam
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of pipefitting in industrial systems?
A. Electrical distribution
B. Transporting fluids and gases safely
C. Structural framing
D. Data transmission
Rationale: Pipefitters install and maintain systems that carry liquids and
gases under pressure.
2. Which tool is commonly used to measure pipe diameter?
A. Micrometer
B. Caliper
C. Tape measure only
D. Protractor
,Rationale: Calipers provide accurate inside and outside diameter
measurements.
3. What does NPT stand for in piping threads?
A. National Pipe Thread
B. Non-Pressure Tube
C. Nominal Pipe Thickness
D. National Pressure Test
Rationale: NPT refers to tapered pipe threads used in North America.
4. Which material is most commonly used for high-pressure steam
lines?
A. PVC
B. Carbon steel
C. Copper
D. Aluminum
Rationale: Carbon steel withstands high temperature and pressure.
5. What is the purpose of a pipe flange?
,A. Reduce weight
B. Join two sections of pipe
C. Increase flow speed
D. Filter fluids
Rationale: Flanges allow bolted connections between pipe sections.
6. Which welding process is most common in pipe welding?
A. TIG (GTAW)
B. Spot welding
C. Friction welding
D. Resistance welding
Rationale: TIG welding provides precision and control for pipe joints.
7. What is the function of a pipe valve?
A. Increase pressure
B. Control flow
C. Measure temperature
D. Support weight
Rationale: Valves regulate or stop fluid flow in piping systems.
, 8. Which fitting changes pipe direction 90 degrees?
A. Tee
B. Elbow
C. Coupling
D. Reducer
Rationale: Elbows are used to change direction in piping systems.
9. What is pipe schedule related to?
A. Color coding
B. Wall thickness
C. Pipe length
D. Flow rate
Rationale: Schedule indicates pipe wall thickness.
10. Which safety equipment is required during pipe welding?
A. Gloves and helmet
B. Sandals
C. Sunglasses only
D. Cotton hat only
Rationale: Proper PPE protects against burns and arc flash.
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of pipefitting in industrial systems?
A. Electrical distribution
B. Transporting fluids and gases safely
C. Structural framing
D. Data transmission
Rationale: Pipefitters install and maintain systems that carry liquids and
gases under pressure.
2. Which tool is commonly used to measure pipe diameter?
A. Micrometer
B. Caliper
C. Tape measure only
D. Protractor
,Rationale: Calipers provide accurate inside and outside diameter
measurements.
3. What does NPT stand for in piping threads?
A. National Pipe Thread
B. Non-Pressure Tube
C. Nominal Pipe Thickness
D. National Pressure Test
Rationale: NPT refers to tapered pipe threads used in North America.
4. Which material is most commonly used for high-pressure steam
lines?
A. PVC
B. Carbon steel
C. Copper
D. Aluminum
Rationale: Carbon steel withstands high temperature and pressure.
5. What is the purpose of a pipe flange?
,A. Reduce weight
B. Join two sections of pipe
C. Increase flow speed
D. Filter fluids
Rationale: Flanges allow bolted connections between pipe sections.
6. Which welding process is most common in pipe welding?
A. TIG (GTAW)
B. Spot welding
C. Friction welding
D. Resistance welding
Rationale: TIG welding provides precision and control for pipe joints.
7. What is the function of a pipe valve?
A. Increase pressure
B. Control flow
C. Measure temperature
D. Support weight
Rationale: Valves regulate or stop fluid flow in piping systems.
, 8. Which fitting changes pipe direction 90 degrees?
A. Tee
B. Elbow
C. Coupling
D. Reducer
Rationale: Elbows are used to change direction in piping systems.
9. What is pipe schedule related to?
A. Color coding
B. Wall thickness
C. Pipe length
D. Flow rate
Rationale: Schedule indicates pipe wall thickness.
10. Which safety equipment is required during pipe welding?
A. Gloves and helmet
B. Sandals
C. Sunglasses only
D. Cotton hat only
Rationale: Proper PPE protects against burns and arc flash.
