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