UA STAR Pipefitting Mastery Certification Exam (2026
Updated Edition) | Verified Practice Questions, Correct
Answers & Expert Rationales | Professional Pipefitter Prep
| Instant PDF
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. The hot tap procedure allows:
A) Compressed air insertion
B) Pipe connections while the system remains under pressure
C) Rapid pipe freezing
D) Purging
Rationale: Hot tapping is used to modify active systems without
shutdown.
5. 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.
, 6. 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.
7. Which fitting changes one pipe size to another?
A) Coupling
B) Elbow
C) Reducer
D) Union
Rationale: Reducers allow transition between different pipe
diameters.
8. 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.
9. Purging stainless steel prevents:
A) Corrosion from oxygen
B) Pipe vibration
Updated Edition) | Verified Practice Questions, Correct
Answers & Expert Rationales | Professional Pipefitter Prep
| Instant PDF
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. The hot tap procedure allows:
A) Compressed air insertion
B) Pipe connections while the system remains under pressure
C) Rapid pipe freezing
D) Purging
Rationale: Hot tapping is used to modify active systems without
shutdown.
5. 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.
, 6. 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.
7. Which fitting changes one pipe size to another?
A) Coupling
B) Elbow
C) Reducer
D) Union
Rationale: Reducers allow transition between different pipe
diameters.
8. 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.
9. Purging stainless steel prevents:
A) Corrosion from oxygen
B) Pipe vibration
