TEXAS PROFESSIONAL ENGINEER MECHANICAL ENGINEERING LICENSING EXAM ACTUAL 2026 VERIFIED QUESTIONS WITH ANSWERS COMPREHENSIVE & RATIONALE|INSTANT DOWNLOAD

TEXAS PROFESSIONAL ENGINEER
MECHANICAL ENGINEERING LICENSING
EXAM ACTUAL 2026 VERIFIED QUESTIONS
WITH ANSWERS COMPREHENSIVE &
RATIONALE|INSTANT DOWNLOAD

1. A mechanical engineer designing a pressure vessel must primarily
consider which ASME code section for unfired pressure vessels?
A. ASME Section I
B. ASME Section II
C. ASME Section VIII
D. ASME Section IX
Answer: C. ASME Section VIII
Rationale: ASME Section VIII provides requirements for the design,
fabrication, inspection, and certification of pressure vessels. Section I
focuses on power boilers, Section II covers materials, and Section IX
addresses welding qualifications.


2. A steel shaft is subjected to a pure torsional load. The maximum
shear stress occurs at which location?
A. Center of the shaft
B. Halfway between center and surface
C. Outer surface of the shaft
D. Uniformly throughout the shaft
Answer: C. Outer surface of the shaft



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,Rationale: In torsion, shear stress varies linearly with radius
according to τ = Tr/J. The maximum stress occurs at the outer radius
where r is greatest.


3. The Reynolds number is primarily used to determine:
A. Heat transfer coefficient
B. Flow regime classification
C. Pressure vessel thickness
D. Pump efficiency
Answer: B. Flow regime classification
Rationale: Reynolds number compares inertial forces to viscous forces
and determines whether flow is laminar, transitional, or turbulent.


4. For incompressible steady flow through a pipe, reducing the pipe
diameter while maintaining constant flow rate will:
A. Reduce velocity
B. Increase velocity
C. Eliminate friction losses
D. Maintain constant velocity
Answer: B. Increase velocity
Rationale: Continuity requires Q = AV. When area decreases while
flow rate remains constant, velocity must increase.


5. A centrifugal pump operates most efficiently near:
A. Shutoff head
B. Best efficiency point


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,C. Maximum flow condition
D. Zero pressure condition
Answer: B. Best efficiency point
Rationale: Pumps are designed to operate near their Best Efficiency
Point (BEP), where hydraulic losses, vibration, and energy
consumption are minimized.


6. The second law of thermodynamics introduces the concept of:
A. Energy conservation
B. Entropy
C. Mass conservation
D. Momentum conservation
Answer: B. Entropy
Rationale: The second law defines the direction of energy transfer and
introduces entropy as a measure of irreversibility.


7. In a vapor-compression refrigeration cycle, the compressor
performs which function?
A. Removes heat from the conditioned space
B. Expands refrigerant
C. Raises refrigerant pressure and temperature
D. Condenses refrigerant
Answer: C. Raises refrigerant pressure and temperature
Rationale: The compressor increases refrigerant pressure, causing a
corresponding increase in temperature before entering the condenser.




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, 8. The coefficient of performance (COP) of a refrigerator is defined
as:
A. Work input divided by cooling output
B. Cooling output divided by work input
C. Heat rejected divided by work input
D. Work output divided by heat input
Answer: B. Cooling output divided by work input
Rationale: COP measures refrigeration effectiveness and is calculated
as desired cooling effect divided by compressor work input.


9. A beam experiencing bending stress has maximum normal stress
at:
A. Neutral axis
B. Centroid
C. Outer fibers
D. Shear center
Answer: C. Outer fibers
Rationale: Bending stress follows σ = My/I. The maximum distance
from the neutral axis produces the highest stress.


10. The primary purpose of a flywheel is to:
A. Increase friction
B. Store rotational energy
C. Reduce shaft diameter
D. Increase temperature
Answer: B. Store rotational energy


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