1|Page
Boiler Operator Licensing Exam (NEW UPDATED VERSION) LATEST ACTUAL
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS AND
ANSWERS)- GUARANTEED PASS A+ UPDATED
1.
The First Law of Thermodynamics is best expressed as:
A. Energy can be created but not destroyed
B. Energy is conserved
C. Heat always flows from hot to cold
D. Entropy always increases
Answer: B
Rationale: The First Law states that energy cannot be created or destroyed, only converted
from one form to another.
2.
Which property is a measure of a system’s ability to do work?
A. Enthalpy
B. Entropy
C. Exergy
D. Internal energy
Answer: C
Rationale: Exergy represents the maximum useful work obtainable as a system reaches
equilibrium with its surroundings.
3.
In a closed system undergoing a constant pressure process, the work done is equal to:
A. ΔU
B. mRT
C. PΔV
D. ΔH
2026 2027 GRADED A+
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Answer: C
Rationale: Boundary work at constant pressure equals pressure multiplied by the change in
volume.
4.
Which thermodynamic process occurs in an ideal Rankine cycle turbine?
A. Isothermal
B. Isochoric
C. Isentropic
D. Polytropic
Answer: C
Rationale: An ideal turbine expansion is assumed to be reversible and adiabatic, thus
isentropic.
5.
Entropy generation is a direct result of:
A. Heat transfer
B. Work transfer
C. Irreversibilities
D. Energy conservation
Answer: C
Rationale: Entropy generation occurs due to irreversibilities such as friction, turbulence, and
heat transfer across finite temperature differences.
6.
Which of the following is an intensive property?
A. Mass
B. Volume
C. Enthalpy
D. Temperature
2026 2027 GRADED A+
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Answer: D
Rationale: Intensive properties are independent of system size; temperature does not depend
on mass.
7.
What happens to entropy during a reversible adiabatic process?
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero
Answer: C
Rationale: A reversible adiabatic process is isentropic; entropy remains constant.
8.
In steam tables, the term hg represents:
A. Enthalpy of saturated liquid
B. Enthalpy of evaporation
C. Enthalpy of superheated steam
D. Enthalpy of saturated vapor
Answer: D
Rationale: hg is the specific enthalpy of saturated vapor at a given pressure or temperature.
9.
What is the primary reason reheating is used in a Rankine cycle?
A. Reduce condenser pressure
B. Increase turbine moisture content
C. Improve thermal efficiency
D. Reduce boiler size
Answer: C
Rationale: Reheating increases average heat addition temperature, improving cycle
efficiency and reducing moisture in later turbine stages.
2026 2027 GRADED A+
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10.
The quality of steam is defined as:
A. Ratio of vapor pressure to total pressure
B. Ratio of vapor volume to total volume
C. Ratio of vapor mass to total mass
D. Ratio of latent heat to sensible heat
Answer: C
Rationale: Steam quality (dryness fraction) is the mass fraction of vapor in a saturated
mixture.
11.
Which process adds the most entropy to a system?
A. Reversible compression
B. Reversible expansion
C. Irreversible heat transfer
D. Isentropic expansion
Answer: C
Rationale: Irreversible heat transfer across finite temperature differences generates entropy.
12.
In the Rankine cycle, the condenser primarily:
A. Produces power
B. Rejects heat
C. Adds heat
D. Increases pressure
Answer: B
Rationale: The condenser removes heat from exhaust steam, converting it back to liquid.
2026 2027 GRADED A+
Boiler Operator Licensing Exam (NEW UPDATED VERSION) LATEST ACTUAL
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS AND
ANSWERS)- GUARANTEED PASS A+ UPDATED
1.
The First Law of Thermodynamics is best expressed as:
A. Energy can be created but not destroyed
B. Energy is conserved
C. Heat always flows from hot to cold
D. Entropy always increases
Answer: B
Rationale: The First Law states that energy cannot be created or destroyed, only converted
from one form to another.
2.
Which property is a measure of a system’s ability to do work?
A. Enthalpy
B. Entropy
C. Exergy
D. Internal energy
Answer: C
Rationale: Exergy represents the maximum useful work obtainable as a system reaches
equilibrium with its surroundings.
3.
In a closed system undergoing a constant pressure process, the work done is equal to:
A. ΔU
B. mRT
C. PΔV
D. ΔH
2026 2027 GRADED A+
,2|Page
Answer: C
Rationale: Boundary work at constant pressure equals pressure multiplied by the change in
volume.
4.
Which thermodynamic process occurs in an ideal Rankine cycle turbine?
A. Isothermal
B. Isochoric
C. Isentropic
D. Polytropic
Answer: C
Rationale: An ideal turbine expansion is assumed to be reversible and adiabatic, thus
isentropic.
5.
Entropy generation is a direct result of:
A. Heat transfer
B. Work transfer
C. Irreversibilities
D. Energy conservation
Answer: C
Rationale: Entropy generation occurs due to irreversibilities such as friction, turbulence, and
heat transfer across finite temperature differences.
6.
Which of the following is an intensive property?
A. Mass
B. Volume
C. Enthalpy
D. Temperature
2026 2027 GRADED A+
,3|Page
Answer: D
Rationale: Intensive properties are independent of system size; temperature does not depend
on mass.
7.
What happens to entropy during a reversible adiabatic process?
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero
Answer: C
Rationale: A reversible adiabatic process is isentropic; entropy remains constant.
8.
In steam tables, the term hg represents:
A. Enthalpy of saturated liquid
B. Enthalpy of evaporation
C. Enthalpy of superheated steam
D. Enthalpy of saturated vapor
Answer: D
Rationale: hg is the specific enthalpy of saturated vapor at a given pressure or temperature.
9.
What is the primary reason reheating is used in a Rankine cycle?
A. Reduce condenser pressure
B. Increase turbine moisture content
C. Improve thermal efficiency
D. Reduce boiler size
Answer: C
Rationale: Reheating increases average heat addition temperature, improving cycle
efficiency and reducing moisture in later turbine stages.
2026 2027 GRADED A+
, 4|Page
10.
The quality of steam is defined as:
A. Ratio of vapor pressure to total pressure
B. Ratio of vapor volume to total volume
C. Ratio of vapor mass to total mass
D. Ratio of latent heat to sensible heat
Answer: C
Rationale: Steam quality (dryness fraction) is the mass fraction of vapor in a saturated
mixture.
11.
Which process adds the most entropy to a system?
A. Reversible compression
B. Reversible expansion
C. Irreversible heat transfer
D. Isentropic expansion
Answer: C
Rationale: Irreversible heat transfer across finite temperature differences generates entropy.
12.
In the Rankine cycle, the condenser primarily:
A. Produces power
B. Rejects heat
C. Adds heat
D. Increases pressure
Answer: B
Rationale: The condenser removes heat from exhaust steam, converting it back to liquid.
2026 2027 GRADED A+
