Chemical Engineering MCQs
Chemical Engineering MCQs provide a strong foundation for those preparing for competitive exams and interviews in the chemical industry. The questions cover core topics including process calculations, heat transfer, mass transfer, chemical reaction engineering, plant design, safety, and environmental concerns. Whether you are a fresh graduate or preparing for job assessments through FPSC, PPSC, or NTS, this section helps reinforce key concepts and identify knowledge gaps. The MCQs reflect actual exam trends and are especially useful for test-based recruitment and academic success in the chemical engineering field.
Q: Le Chatelier’s principle relates to
A) Kinetics
B) Thermodynamics
C) Chemical equilibrium
D) Fluid flow
✅ Correct Answer: C
Explanation: Describes response to system changes.
Q: Fouling in heat exchangers leads to
A) Reduced corrosion
B) Better heat transfer
C) Increased pressure
D) Lower efficiency
✅ Correct Answer: D
Explanation: Fouling decreases thermal efficiency.
Q: Material commonly used in reactor linings
A) PVC
B) Graphite
C) Stainless steel
D) Copper
✅ Correct Answer: B
Explanation: Graphite resists high temperatures and corrosion.
Q: In a batch reactor, conversion depends on
A) Reactor size
B) Time
C) Flow rate
D) Heat exchanger
✅ Correct Answer: B
Explanation: No inflow/outflow; time governs conversion.
Q: Packing in distillation columns increases
A) Pressure drop
B) Flow resistance
C) Viscosity
D) Surface area
✅ Correct Answer: D
Explanation: Enhances contact between vapor and liquid.
Q: Role of catalyst in chemical reaction
A) Increases yield
B) Decreases pressure
C) Reduces temperature
D) Increases rate
✅ Correct Answer: D
Explanation: Speeds up reaction without consumption.
Q: Dimensionless number for natural convection
A) Prandtl
B) Reynolds
C) Grashof
D) Nusselt
✅ Correct Answer: C
Explanation: Grashof number governs buoyancy-driven flow.
Q: Main component of natural gas
A) Methane
B) Ethane
C) Butane
D) Propane
✅ Correct Answer: A
Explanation: Methane is the primary constituent.
Q: Ziegler-Natta catalysts are used in
A) Reforming
B) Oil refining
C) Ethylene polymerization
D) Alkylation
✅ Correct Answer: C
Explanation: Used to produce polymers like polyethylene.
Q: Humidification is used to
A) Add moisture
B) Cool gases
C) Remove heat
D) Dry air
✅ Correct Answer: A
Explanation: Increases water content in air/gases.