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: Purpose of a cyclone separator
A) Heat transfer
B) Gas compression
C) Fluid mixing
D) Particle separation
✅ Correct Answer: D
Explanation: Removes particulates using centrifugal force.
Q: Residence time in CSTR is defined as
A) Volume/Flow rate
B) Volume/Area
C) Area/Velocity
D) Flow rate/Volume
✅ Correct Answer: A
Explanation: Important for reaction performance.
Q: Prandtl number represents ratio of
A) Thermal to molecular diffusivity
B) Heat to mass transfer
C) Viscosity to density
D) Pressure to velocity
✅ Correct Answer: A
Explanation: Key in heat transfer calculations.
Q: Operation involving simultaneous heat and mass transfer
A) Evaporation
B) All of these
C) Distillation
D) Absorption
✅ Correct Answer: B
Explanation: All involve both heat and mass movement.
Q: Material balancing requires knowledge of
A) Process flow diagrams
B) Reaction kinetics
C) Stoichiometry
D) Equipment design
✅ Correct Answer: C
Explanation: Balancing is stoichiometry-based.
Q: Steam reforming is used for producing
A) Hydrogen
B) Propylene
C) Methanol
D) Ethylene
✅ Correct Answer: A
Explanation: Converts hydrocarbons into hydrogen.
Q: Knudsen number helps in analyzing
A) Heat loss
B) Pressure drop
C) Molecular flow
D) Viscosity
✅ Correct Answer: C
Explanation: Useful in micro/nano-scale fluid dynamics.
Q: Primary function of a boiler
A) Condense steam
B) Absorb heat
C) Cool gas
D) Generate steam
✅ Correct Answer: D
Explanation: Converts water to steam.
Q: Mass transfer coefficient units
A) mol/m³
B) mol/m²·s
C) kg/m³·s
D) mol/s·m²
✅ Correct Answer: B
Explanation: Represents mass flux per unit area per time.
Q: Shell-and-tube exchangers are used for
A) Mixing chemicals
B) Compressing gases
C) Mass transfer
D) Heat exchange
✅ Correct Answer: D
Explanation: Common for heat transfer between fluids.