Principles and Practice of Engineering
(PE) Mechanical Actual Exam 2026
Complete Questions and Verified
Answers with Detailed Rationales 100%
Correct Grade A Pass Guaranteed - A+
Graded
1. A simply supported beam carries a concentrated load at its midpoint. Where
is the maximum bending moment located?
A. At the left support
B. One-quarter of the span from the left support
C. At the midpoint of the beam
D. At the right support
Answer: C. At the midpoint of the beam
Rationale: For a simply supported beam with a single concentrated load applied at
midspan, the bending moment increases linearly from each support to the center.
The maximum bending moment occurs directly beneath the applied load.
2. Which SI unit is equivalent to one joule?
A. Newton per meter
B. Newton-meter
C. Pascal-meter
D. Watt-second squared
,Answer: B. Newton-meter
Rationale: A joule is the SI unit of energy and is defined as one newton acting
through a distance of one meter (1 J = 1 N·m). Although torque also has units of
N·m, energy and torque represent different physical quantities.
3. The first law of thermodynamics is primarily an expression of the
conservation of:
A. Momentum
B. Mass
C. Energy
D. Entropy
Answer: C. Energy
Rationale: The first law states that energy cannot be created or destroyed, only
transferred or converted between forms.
4. Increasing the diameter of a circular shaft primarily increases its resistance to
torsion because the:
A. Density increases
B. Polar moment of inertia increases
C. Elastic modulus increases
D. Thermal conductivity increases
Answer: B. Polar moment of inertia increases
Rationale: The torsional stiffness and strength of a circular shaft depend strongly
on its polar moment of inertia, which increases rapidly as diameter increases.
5. Which property measures a material's resistance to elastic deformation?
,A. Toughness
B. Hardness
C. Young's modulus
D. Ductility
Answer: C. Young's modulus
Rationale: Young's modulus, or modulus of elasticity, describes the relationship
between stress and elastic strain within the proportional limit.
6. Bernoulli's equation assumes flow is:
A. Compressible and unsteady
B. Turbulent
C. Steady, incompressible, and along a streamline
D. Supersonic
Answer: C. Steady, incompressible, and along a streamline
Rationale: Bernoulli's equation is derived under assumptions including steady
flow, negligible viscosity, incompressible fluid, and application along a streamline.
7. The Reynolds number primarily predicts:
A. Heat transfer rate
B. Pressure
C. Flow regime
D. Vapor pressure
Answer: C. Flow regime
Rationale: Reynolds number compares inertial forces to viscous forces and
indicates whether flow is likely to be laminar or turbulent.
, 8. Fourier's law describes:
A. Fluid friction
B. Radiation
C. Heat conduction
D. Diffusion
Answer: C. Heat conduction
Rationale: Fourier's law states that conductive heat transfer is proportional to the
negative temperature gradient.
9. Which HVAC component removes moisture while cooling air?
A. Furnace
B. Cooling coil
C. Humidifier
D. Expansion tank
Answer: B. Cooling coil
Rationale: When air is cooled below its dew point, moisture condenses on the
cooling coil, reducing humidity.
10. The efficiency of a heat engine is always less than 100% because of:
A. Newton's First Law
B. The Second Law of Thermodynamics
C. Hooke's Law
D. Pascal's Law
Answer: B. The Second Law of Thermodynamics
(PE) Mechanical Actual Exam 2026
Complete Questions and Verified
Answers with Detailed Rationales 100%
Correct Grade A Pass Guaranteed - A+
Graded
1. A simply supported beam carries a concentrated load at its midpoint. Where
is the maximum bending moment located?
A. At the left support
B. One-quarter of the span from the left support
C. At the midpoint of the beam
D. At the right support
Answer: C. At the midpoint of the beam
Rationale: For a simply supported beam with a single concentrated load applied at
midspan, the bending moment increases linearly from each support to the center.
The maximum bending moment occurs directly beneath the applied load.
2. Which SI unit is equivalent to one joule?
A. Newton per meter
B. Newton-meter
C. Pascal-meter
D. Watt-second squared
,Answer: B. Newton-meter
Rationale: A joule is the SI unit of energy and is defined as one newton acting
through a distance of one meter (1 J = 1 N·m). Although torque also has units of
N·m, energy and torque represent different physical quantities.
3. The first law of thermodynamics is primarily an expression of the
conservation of:
A. Momentum
B. Mass
C. Energy
D. Entropy
Answer: C. Energy
Rationale: The first law states that energy cannot be created or destroyed, only
transferred or converted between forms.
4. Increasing the diameter of a circular shaft primarily increases its resistance to
torsion because the:
A. Density increases
B. Polar moment of inertia increases
C. Elastic modulus increases
D. Thermal conductivity increases
Answer: B. Polar moment of inertia increases
Rationale: The torsional stiffness and strength of a circular shaft depend strongly
on its polar moment of inertia, which increases rapidly as diameter increases.
5. Which property measures a material's resistance to elastic deformation?
,A. Toughness
B. Hardness
C. Young's modulus
D. Ductility
Answer: C. Young's modulus
Rationale: Young's modulus, or modulus of elasticity, describes the relationship
between stress and elastic strain within the proportional limit.
6. Bernoulli's equation assumes flow is:
A. Compressible and unsteady
B. Turbulent
C. Steady, incompressible, and along a streamline
D. Supersonic
Answer: C. Steady, incompressible, and along a streamline
Rationale: Bernoulli's equation is derived under assumptions including steady
flow, negligible viscosity, incompressible fluid, and application along a streamline.
7. The Reynolds number primarily predicts:
A. Heat transfer rate
B. Pressure
C. Flow regime
D. Vapor pressure
Answer: C. Flow regime
Rationale: Reynolds number compares inertial forces to viscous forces and
indicates whether flow is likely to be laminar or turbulent.
, 8. Fourier's law describes:
A. Fluid friction
B. Radiation
C. Heat conduction
D. Diffusion
Answer: C. Heat conduction
Rationale: Fourier's law states that conductive heat transfer is proportional to the
negative temperature gradient.
9. Which HVAC component removes moisture while cooling air?
A. Furnace
B. Cooling coil
C. Humidifier
D. Expansion tank
Answer: B. Cooling coil
Rationale: When air is cooled below its dew point, moisture condenses on the
cooling coil, reducing humidity.
10. The efficiency of a heat engine is always less than 100% because of:
A. Newton's First Law
B. The Second Law of Thermodynamics
C. Hooke's Law
D. Pascal's Law
Answer: B. The Second Law of Thermodynamics
