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