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Boiler License Exam 2025 – Complete Questions and Correct Answers (Engineering Certification Study Material)

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This document provides the full set of 100 questions and correct answers for the Boiler License Exam 2025. It covers essential topics in boiler operation, maintenance, and safety — including combustion principles, heat transfer, steam systems, pumps, feedwater treatment, efficiency, and ASME standards. The material is ideal for students and professionals preparing for licensing exams or upgrading their technical knowledge in boiler engineering and power plant operations.

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BOILER LICENSE EXAM 2025 QUESTIONS
AND CORRECT ANSWERS


1. are necessary for complete combustion.
A. Forced draft, air, time, and temperature
B. Mixture, atomization, time, and temperature

C. Time, temperature, and draft

D. Heat, draft, and turbulence - ANSWER****B. Mixture, atomization, time,
temperature


2. If a steam pressure gauge indicates 80 psig, the absolute pressure is psia.
A. 14.7

B. 65.3

C. 80.0

D. 94.7 - ANSWER****D. 94.7



3. A neutral solution is on the
pH scale.
A.0.0
B. 7.0
C.8.3
D. 11.0 - ANSWER****B 7.0


4. A (n) test is used to determine smoke density
A. pH

,B. Ringelmann

C. MATT

D. Orsat - ANSWER****B. Ringelmann




5. A steam pressure gauge has a between the boiler and the pressure gauge to
protect the gauge.

A.siphon
B. Strainer
C. Water column
D. Vent - ANSWER****A. Siphon


6. Draft is measured with a .
A. Bourdon Tube

B. Hydrometer

C. Manometer

D. Viscometer - ANSWER****C. Manometer



7. IN an
inverted bucket steam trap, the bucket as the trap fills with
condensate.
A. Rotates

B. Sinks

C. Rises

D. Tilts - ANSWER****B. Sinks


8. A hole is drilled in the end of a stay bolt to .

, A. Warn of a corroded stay
B. Increase strength

C. Allow for expansion and contraction

D. Increase Corrosion resistance - ANSWER****A. Warn of a corroded stay


9. When coal is classified, refers to hardness.
A. Volatiles

B. Clinker

C. Grade
D. Rank - ANSWER****D. Rank



10. A higher than normal oxygen (o2) reading in the gases of combustion may
result from .
A. Complete combustion

B. Stoichiometric

C. Too much excess air
D. Poor electrostatic precipitator operation - ANSWER****C. Too much excess
air


11. An economizer uses heat from the to heat feed water.
A. Gases of combustion
B. Superheater

C. Desuperheater

D. Live steam - ANSWER****A. Gases of combustion


12.A straight-tube watertube boiler with one hundred 3" diameter tubes that are
12' long has
sq. ft.

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