UA STAR Pipefitter Certification Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
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1. Which type of pipe joint is commonly used for high-pressure steam lines?
A) Threaded
B) Welded
C) Soldered
D) Grooved
Rationale: Welded joints provide the strength required for high-pressure
steam applications.
2. What is the primary purpose of a pipefitter’s layout?
A) Inspecting existing piping
B) Ensuring accurate pipe fabrication and installation
C) Cleaning piping systems
D) Operating valves
Rationale: Layout determines exact lengths, angles, and positions to
ensure precise fit during installation.
3. Which alloy is most suitable for piping that carries high-temperature
corrosive chemicals?
A) Carbon steel
, B) Brass
C) Stainless steel
D) Copper
Rationale: Stainless steel resists corrosion and maintains strength at
elevated temperatures.
4. When using a pipe threader, what is essential to ensure a proper thread?
A) Use of solder
B) Applying cutting oil
C) Heating the pipe
D) Cooling with water
Rationale: Cutting oil lubricates the die, reduces friction, and produces a
clean thread.
5. Which code governs most mechanical piping installations in the U.S.?
A) NEC
B) NFPA 70
C) ASME B31.1 / B31.3
D) ASTM A106
Rationale: ASME B31.1 covers power piping and B31.3 covers process
piping, both standard references for pipefitters.
6. What is the function of a pipe support hanger?
A) Seal pipe joints
B) Support and secure piping to prevent sagging
C) Measure flow
D) Insulate pipe
Rationale: Hangers and supports maintain alignment, reduce stress, and
prevent movement of piping systems.
7. Which method is used to join black steel pipe in fire protection systems?
A) Soldering
B) Threaded coupling
C) Grooved coupling
D) Welding
, Rationale: Threaded black steel is standard for fire sprinkler systems due
to ease of assembly and strength.
8. What is a standard wall thickness schedule for a 4-inch steel pipe used in
industrial applications?
A) Schedule 10
B) Schedule 20
C) Schedule 40
D) Schedule 5
Rationale: Schedule 40 is a commonly used standard for medium-pressure
industrial piping.
9. Which type of pipe bending does not require heat?
A) Induction bending
B) Cold bending
C) Hot bending
D) Flame bending
Rationale: Cold bending uses mechanical force to bend pipe without
heating, suitable for certain diameters and wall thicknesses.
10.What is the main hazard associated with welding in confined spaces?
A) Noise
B) Heat
C) Toxic fumes and oxygen deficiency
D) Sparks
Rationale: Confined spaces may accumulate harmful gases and lack
oxygen, posing significant risk during welding.
11.What is the proper action if a pressure test shows a small leak at a welded
joint?
A) Ignore it
B) Apply sealant
C) Depressurize and repair the joint
D) Increase pressure to test further
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. Which type of pipe joint is commonly used for high-pressure steam lines?
A) Threaded
B) Welded
C) Soldered
D) Grooved
Rationale: Welded joints provide the strength required for high-pressure
steam applications.
2. What is the primary purpose of a pipefitter’s layout?
A) Inspecting existing piping
B) Ensuring accurate pipe fabrication and installation
C) Cleaning piping systems
D) Operating valves
Rationale: Layout determines exact lengths, angles, and positions to
ensure precise fit during installation.
3. Which alloy is most suitable for piping that carries high-temperature
corrosive chemicals?
A) Carbon steel
, B) Brass
C) Stainless steel
D) Copper
Rationale: Stainless steel resists corrosion and maintains strength at
elevated temperatures.
4. When using a pipe threader, what is essential to ensure a proper thread?
A) Use of solder
B) Applying cutting oil
C) Heating the pipe
D) Cooling with water
Rationale: Cutting oil lubricates the die, reduces friction, and produces a
clean thread.
5. Which code governs most mechanical piping installations in the U.S.?
A) NEC
B) NFPA 70
C) ASME B31.1 / B31.3
D) ASTM A106
Rationale: ASME B31.1 covers power piping and B31.3 covers process
piping, both standard references for pipefitters.
6. What is the function of a pipe support hanger?
A) Seal pipe joints
B) Support and secure piping to prevent sagging
C) Measure flow
D) Insulate pipe
Rationale: Hangers and supports maintain alignment, reduce stress, and
prevent movement of piping systems.
7. Which method is used to join black steel pipe in fire protection systems?
A) Soldering
B) Threaded coupling
C) Grooved coupling
D) Welding
, Rationale: Threaded black steel is standard for fire sprinkler systems due
to ease of assembly and strength.
8. What is a standard wall thickness schedule for a 4-inch steel pipe used in
industrial applications?
A) Schedule 10
B) Schedule 20
C) Schedule 40
D) Schedule 5
Rationale: Schedule 40 is a commonly used standard for medium-pressure
industrial piping.
9. Which type of pipe bending does not require heat?
A) Induction bending
B) Cold bending
C) Hot bending
D) Flame bending
Rationale: Cold bending uses mechanical force to bend pipe without
heating, suitable for certain diameters and wall thicknesses.
10.What is the main hazard associated with welding in confined spaces?
A) Noise
B) Heat
C) Toxic fumes and oxygen deficiency
D) Sparks
Rationale: Confined spaces may accumulate harmful gases and lack
oxygen, posing significant risk during welding.
11.What is the proper action if a pressure test shows a small leak at a welded
joint?
A) Ignore it
B) Apply sealant
C) Depressurize and repair the joint
D) Increase pressure to test further
