Principles and Practice of Engineering
(PE) Practice Exam Question And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A |Instant
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1. What is the SI unit of force?
A. Joule
B. Watt
C. Newton
D. Pascal
Rationale: A Newton is the SI unit of force and is defined as the force
required to accelerate a one-kilogram mass by one meter per second
squared.
2. A stress-strain curve for ductile materials typically shows which point as the
onset of plastic deformation?
A. Ultimate point
B. Yield point
C. Fracture point
D. Elastic limit only
Rationale: The yield point marks the beginning of plastic (permanent)
deformation in ductile materials.
3. What type of load primarily causes shear stress in a beam?
A. Axial tensile load
B. Torsional load
C. Transverse load
D. Thermal load
, Rationale: Transverse loads act perpendicular to the beam’s axis and
create internal shear forces.
4. The process of adding lime to water is known as:
A. Carbonation
B. Coagulation
C. Slaking
D. Calcination
Rationale: Slaking is the exothermic reaction of quicklime (CaO) with
water to produce calcium hydroxide.
5. Which soil property measures resistance to deformation under load?
A. Porosity
B. Compressibility
C. Permeability
D. Plasticity index
Rationale: Compressibility indicates how much a soil will deform when
subjected to stress.
6. What is the purpose of a factor of safety in design?
A. To increase cost
B. To eliminate all failure risks
C. To provide a margin between capacity and actual load
D. To reduce material strength
Rationale: The factor of safety accounts for uncertainty in loads, material
properties, and construction quality.
7. In fluid mechanics, laminar flow generally occurs at Reynolds numbers:
A. Above 4000
B. Below 2000
C. Between 4000 and 10,000
D. Exactly at 3000
Rationale: Laminar flow typically exists when the Reynolds number is less
than about 2000.
, 8. Which test is used to determine the concrete compressive strength?
A. Slump test
B. Cylinder compression test
C. Air content test
D. Sieve analysis
Rationale: The cylinder compression test directly measures the
compressive strength of hardened concrete.
9. What is the primary function of a control volume in thermodynamics?
A. To measure temperature
B. To store energy
C. To analyze mass and energy flow
D. To eliminate heat loss
Rationale: A control volume is used to analyze systems where mass and
energy cross system boundaries.
10.Which device is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Rationale: An ammeter measures electric current in amperes.
11.The bending stress in a beam is calculated using which formula?
A. τ = V/A
B. σ = Mc/I
C. ε = ΔL/L
D. P = VI
Rationale: The flexure formula σ = Mc/I relates bending moment to
normal stress in beams.
12.Darcy’s law is used to calculate:
A. Soil compaction
B. Flow through porous media
C. Air velocity
(PE) Practice Exam Question And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A |Instant
Download Pdf
1. What is the SI unit of force?
A. Joule
B. Watt
C. Newton
D. Pascal
Rationale: A Newton is the SI unit of force and is defined as the force
required to accelerate a one-kilogram mass by one meter per second
squared.
2. A stress-strain curve for ductile materials typically shows which point as the
onset of plastic deformation?
A. Ultimate point
B. Yield point
C. Fracture point
D. Elastic limit only
Rationale: The yield point marks the beginning of plastic (permanent)
deformation in ductile materials.
3. What type of load primarily causes shear stress in a beam?
A. Axial tensile load
B. Torsional load
C. Transverse load
D. Thermal load
, Rationale: Transverse loads act perpendicular to the beam’s axis and
create internal shear forces.
4. The process of adding lime to water is known as:
A. Carbonation
B. Coagulation
C. Slaking
D. Calcination
Rationale: Slaking is the exothermic reaction of quicklime (CaO) with
water to produce calcium hydroxide.
5. Which soil property measures resistance to deformation under load?
A. Porosity
B. Compressibility
C. Permeability
D. Plasticity index
Rationale: Compressibility indicates how much a soil will deform when
subjected to stress.
6. What is the purpose of a factor of safety in design?
A. To increase cost
B. To eliminate all failure risks
C. To provide a margin between capacity and actual load
D. To reduce material strength
Rationale: The factor of safety accounts for uncertainty in loads, material
properties, and construction quality.
7. In fluid mechanics, laminar flow generally occurs at Reynolds numbers:
A. Above 4000
B. Below 2000
C. Between 4000 and 10,000
D. Exactly at 3000
Rationale: Laminar flow typically exists when the Reynolds number is less
than about 2000.
, 8. Which test is used to determine the concrete compressive strength?
A. Slump test
B. Cylinder compression test
C. Air content test
D. Sieve analysis
Rationale: The cylinder compression test directly measures the
compressive strength of hardened concrete.
9. What is the primary function of a control volume in thermodynamics?
A. To measure temperature
B. To store energy
C. To analyze mass and energy flow
D. To eliminate heat loss
Rationale: A control volume is used to analyze systems where mass and
energy cross system boundaries.
10.Which device is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
Rationale: An ammeter measures electric current in amperes.
11.The bending stress in a beam is calculated using which formula?
A. τ = V/A
B. σ = Mc/I
C. ε = ΔL/L
D. P = VI
Rationale: The flexure formula σ = Mc/I relates bending moment to
normal stress in beams.
12.Darcy’s law is used to calculate:
A. Soil compaction
B. Flow through porous media
C. Air velocity
