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Master Steamfitter License Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf
- What is the primary purpose of a steam trap in a steam system?
a) Reduce pipe noise
b) Increase steam pressure
c) Remove condensate from steam lines
d) Measure steam temperature
Rationale: Removing condensate improves system efficiency and
prevents water hammer.
- What type of expansion joint is commonly used to accommodate
thermal movement in long steam pipelines?
a) Rubber bushing
b) Bellows expansion joint 1 / 3
c) Threaded union
d) Welded flange
Rationale: Bellows joints are designed specifically for thermal
expansion in high-temperature piping.
- The most common pipe material used for high-pressure steam
systems is:
a) Copper
b) Carbon steel
c) PVC
d) Aluminum
Rationale: Carbon steel withstands high temperatures and pressures.
- What causes “water hammer” in steam systems?
a) Over-lubrication of pumps
b) Condensate accumulation in pipes
c) Excess air pressure
d) Chemical corrosion
Rationale: Sudden condensate movement creates shock waves.
- Which fitting is typically used to allow thermal movement while
maintaining alignment?
a) Socket weld
b) Threaded coupling
c) Expansion loop
d) Tee 2 / 3
Rationale: Expansion loops provide flexible piping displacement
during heating.
- Which code governs steam boiler construction?
a) NEC
b) ASME Section I
c) NFPA 13
d) API 510
Rationale: ASME Section I applies to power boilers and steam
generation.
- Which of the following best describes saturated steam?
a) Steam cooled below boiling point
b) Steam containing moisture at boiling conditions
c) Steam heated to very high dryness
d) Supercooled steam droplets
Rationale: Saturated steam is steam in equilibrium with liquid water
at the boiling point.
8. A steam system pressure gauge must be calibrated to read up to:
- 50% above operating pressure
- 1.5 times the safety valve setting
c) Twice the maximum flow rate
d) Same as relief valve setting
Rationale: Code requirements ensure accurate pressure monitoring.
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