UA STAR Pipefitting Mastery Certification Exam Test
Questions And Correct Answers (Verified Answers)
With Rationales | Newest Update 2026/2027.
1. What is the primary purpose of a pipe support system?
A) Improve insulation
B) Maintain pipe alignment and reduce stress
C) Increase pipe temperature
D) Prevent fluid flow
Rationale: Proper supports prevent pipe sagging, misalignment, and
stress on joints.
2. The most accurate method for measuring pipe length for fabrication is:
A) Steel tape only
B) Visual estimation
C) Use of measuring tape with take-up for fittings
D) Digital laser only
Rationale: Accounting for fitting allowances ensures correct final
length.
3. What type of valve provides the best throttling control?
A) Gate valve
B) Check valve
C) Globe valve
, D) Ball valve
Rationale: Globe valves are designed for precise flow regulation.
4. A correct root opening for SMAW welding on pipe is typically:
A) Closed
B) 1/8 inch depending on procedure
C) 1/2 inch
D) 3/4 inch
Rationale: Proper fit-up improves penetration and weld integrity.
5. The best choice of pipe material for high-pressure steam is:
A) PVC
B) Copper
C) Carbon steel
D) PEX
Rationale: Carbon steel withstands high temperature and pressure
conditions.
6. Which fitting changes one pipe size to another?
A) Coupling
B) Elbow
C) Reducer
D) Union
Rationale: Reducers allow transition between different pipe diameters.
7. The take-out of a 90° elbow depends on:
A) Pipe schedule only
, B) Elbow center-to-end dimension
C) Pipe coating
D) Thread pitch
Rationale: Take-out is determined by fitting geometry.
8. Purging stainless steel prevents:
A) Corrosion from oxygen
B) Pipe vibration
C) Chromium carbide precipitation
D) Misalignment
Rationale: Purging protects weld integrity from oxidation.
9. Which test ensures leakage detection in a completed pipeline?
A) Radiography
B) Ultrasonic test
C) Hydrostatic test
D) Magnetic flux test
Rationale: Hydrotesting confirms pressure holding and sealing.
10. One advantage of flanged piping systems:
A) Lower cost than welded
B) Easier disassembly for maintenance
C) No gaskets required
D) Zero leak potential
Rationale: Flanges allow access to equipment and components.
11. A shutoff valve with quick quarter-turn operation:
Questions And Correct Answers (Verified Answers)
With Rationales | Newest Update 2026/2027.
1. What is the primary purpose of a pipe support system?
A) Improve insulation
B) Maintain pipe alignment and reduce stress
C) Increase pipe temperature
D) Prevent fluid flow
Rationale: Proper supports prevent pipe sagging, misalignment, and
stress on joints.
2. The most accurate method for measuring pipe length for fabrication is:
A) Steel tape only
B) Visual estimation
C) Use of measuring tape with take-up for fittings
D) Digital laser only
Rationale: Accounting for fitting allowances ensures correct final
length.
3. What type of valve provides the best throttling control?
A) Gate valve
B) Check valve
C) Globe valve
, D) Ball valve
Rationale: Globe valves are designed for precise flow regulation.
4. A correct root opening for SMAW welding on pipe is typically:
A) Closed
B) 1/8 inch depending on procedure
C) 1/2 inch
D) 3/4 inch
Rationale: Proper fit-up improves penetration and weld integrity.
5. The best choice of pipe material for high-pressure steam is:
A) PVC
B) Copper
C) Carbon steel
D) PEX
Rationale: Carbon steel withstands high temperature and pressure
conditions.
6. Which fitting changes one pipe size to another?
A) Coupling
B) Elbow
C) Reducer
D) Union
Rationale: Reducers allow transition between different pipe diameters.
7. The take-out of a 90° elbow depends on:
A) Pipe schedule only
, B) Elbow center-to-end dimension
C) Pipe coating
D) Thread pitch
Rationale: Take-out is determined by fitting geometry.
8. Purging stainless steel prevents:
A) Corrosion from oxygen
B) Pipe vibration
C) Chromium carbide precipitation
D) Misalignment
Rationale: Purging protects weld integrity from oxidation.
9. Which test ensures leakage detection in a completed pipeline?
A) Radiography
B) Ultrasonic test
C) Hydrostatic test
D) Magnetic flux test
Rationale: Hydrotesting confirms pressure holding and sealing.
10. One advantage of flanged piping systems:
A) Lower cost than welded
B) Easier disassembly for maintenance
C) No gaskets required
D) Zero leak potential
Rationale: Flanges allow access to equipment and components.
11. A shutoff valve with quick quarter-turn operation:
