UA STAR Pipefitter Certification Practice
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Exam Questions And Correct Answers
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(Verified Answers) Plus Rationales 2026
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Q&A | Instant Download Pdf
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1. What is the primary purpose of a pipefitter’s level?
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A) To measure distance
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B) To ensure proper alignment and pitch of piping
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C) To determine pipe diameter
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D) To check thread depth
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Rationale: A level ensures pipes are properly pitched for drainage and
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alignment in installation.
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2. What is the most common welding process used for carbon steel piping?
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A) TIG
B) SMAW (Shielded Metal Arc Welding)
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C) MIG
D) Oxy-acetylene
,Rationale: SMAW is widely used in the field for carbon steel due to
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portability and versatility.
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3. Which fitting is used to change the direction of a pipeline by 90 degrees?
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A) Tee
B) Elbow
C) Coupling
D) Reducer
Rationale: Elbows change direction, with 90° and 45° being most common.
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4. What type of thread is used on most pipe fittings for pressure systems?
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A) Straight
B) Tapered (NPT) o
C) Square
D) Metric
Rationale: NPT (National Pipe Thread) is tapered to ensure a tight, leak-
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resistant seal.
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5. What is the formula to find the circumference of a pipe?
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A) π × diameter²
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B) π × diameter
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C) diameter ÷ π o o
D) radius × π² o o
Rationale: Circumference equals π times the diameter.
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6. Which safety document outlines chemical hazards in the workplace?
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A) OSHA Card o
, B) Fire Permit
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C) Safety Data Sheet (SDS)
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D) Confined Space Entry Form o o o
Rationale: SDS provides information on handling, hazards, and emergency
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procedures for chemicals.
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7. What is the main purpose of pipe insulation?
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A) Aesthetic improvement o
B) Temperature control and energy efficiency o o o o
C) Prevent corrosion o
D) Strengthen the pipe o o
Rationale: Insulation maintains temperature and prevents energy loss.
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8. What is the standard angle for a welding bevel on a pipe joint?
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A) 20°
B) 37.5°
C) 45°
D) 60°
Rationale: 37.5° per side provides proper penetration for butt welds.
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9. What is the meaning of “Schedule” in piping?
o o o o o o o
A) Pipe gradeo
B) Pressure rating o
C) Wall thickness
o
D) Pipe length
o
Rationale: Schedule designates wall thickness for pressure containment.
o o o o o o o
o o o o
Exam Questions And Correct Answers
o o o o o
(Verified Answers) Plus Rationales 2026
o o o o o
Q&A | Instant Download Pdf
o o o o o
1. What is the primary purpose of a pipefitter’s level?
o o o o o o o o
A) To measure distance
o o
B) To ensure proper alignment and pitch of piping
o o o o o o o
C) To determine pipe diameter
o o o
D) To check thread depth
o o o
Rationale: A level ensures pipes are properly pitched for drainage and
o o o o o o o o o o
alignment in installation.
o o o
2. What is the most common welding process used for carbon steel piping?
o o o o o o o o o o o
A) TIG
B) SMAW (Shielded Metal Arc Welding)
o o o o
C) MIG
D) Oxy-acetylene
,Rationale: SMAW is widely used in the field for carbon steel due to
o o o o o o o o o o o o
portability and versatility.
o o o
3. Which fitting is used to change the direction of a pipeline by 90 degrees?
o o o o o o o o o o o o o
A) Tee
B) Elbow
C) Coupling
D) Reducer
Rationale: Elbows change direction, with 90° and 45° being most common.
o o o o o o o o o o
4. What type of thread is used on most pipe fittings for pressure systems?
o o o o o o o o o o o o
A) Straight
B) Tapered (NPT) o
C) Square
D) Metric
Rationale: NPT (National Pipe Thread) is tapered to ensure a tight, leak-
o o o o o o o o o o o
resistant seal.
o o
5. What is the formula to find the circumference of a pipe?
o o o o o o o o o o
A) π × diameter²
o o
B) π × diameter
o o
C) diameter ÷ π o o
D) radius × π² o o
Rationale: Circumference equals π times the diameter.
o o o o o o
6. Which safety document outlines chemical hazards in the workplace?
o o o o o o o o
A) OSHA Card o
, B) Fire Permit
o
C) Safety Data Sheet (SDS)
o o o
D) Confined Space Entry Form o o o
Rationale: SDS provides information on handling, hazards, and emergency
o o o o o o o o
procedures for chemicals.
o o o
7. What is the main purpose of pipe insulation?
o o o o o o o
A) Aesthetic improvement o
B) Temperature control and energy efficiency o o o o
C) Prevent corrosion o
D) Strengthen the pipe o o
Rationale: Insulation maintains temperature and prevents energy loss.
o o o o o o o
8. What is the standard angle for a welding bevel on a pipe joint?
o o o o o o o o o o o o
A) 20°
B) 37.5°
C) 45°
D) 60°
Rationale: 37.5° per side provides proper penetration for butt welds.
o o o o o o o o o
9. What is the meaning of “Schedule” in piping?
o o o o o o o
A) Pipe gradeo
B) Pressure rating o
C) Wall thickness
o
D) Pipe length
o
Rationale: Schedule designates wall thickness for pressure containment.
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