UA STAR Pipefitter Certification Exam Questions And
Correct Answers (100% Verified Answers) With
Rationales | Latest Update 2026/2027 | Graded A+.
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 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.
10. Which drawing shows a piping system as it appears from above?
A) Isometric
B) Sectional
C) Plan view
D) Elevation
Rationale: Plan view is a top-down representation of piping layout.
11. What tool is used to thread a steel pipe?
A) Pipe cutter
B) Pipe threader
C) Die grinder
D) Pipe wrench
Rationale: Pipe threaders cut threads into the pipe ends for fittings.
12. The main difference between ferrous and nonferrous metals is:
Correct Answers (100% Verified Answers) With
Rationales | Latest Update 2026/2027 | Graded A+.
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 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.
10. Which drawing shows a piping system as it appears from above?
A) Isometric
B) Sectional
C) Plan view
D) Elevation
Rationale: Plan view is a top-down representation of piping layout.
11. What tool is used to thread a steel pipe?
A) Pipe cutter
B) Pipe threader
C) Die grinder
D) Pipe wrench
Rationale: Pipe threaders cut threads into the pipe ends for fittings.
12. The main difference between ferrous and nonferrous metals is:
