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: Distillation efficiency is measured by
A) Residence time
B) Plate count
C) Murphree efficiency
D) Reflux ratio
✅ Correct Answer: C
Explanation: Indicates tray performance.
Q: Dehumidification involves
A) Reducing temperature
B) Removing moisture
C) Adding water
D) Adding heat
✅ Correct Answer: B
Explanation: Removes moisture from air.
Q: Sublimation is transition from
A) Solid to gas
B) Gas to solid
C) Liquid to gas
D) Solid to liquid
✅ Correct Answer: A
Explanation: Direct solid-to-gas conversion.
Q: Diffusion coefficient increases with
A) Increased pressure
B) Higher viscosity
C) Smaller molecules
D) Lower temperature
✅ Correct Answer: C
Explanation: Smaller molecules diffuse faster.
Q: Main advantage of fluidized bed reactor
A) Uniform temperature
B) High cost
C) Poor control
D) Catalyst deactivation
✅ Correct Answer: A
Explanation: Fluidization ensures even heat distribution.
Q: Fourier’s law governs
A) Heat conduction
B) Momentum
C) Mass transfer
D) Radiation
✅ Correct Answer: A
Explanation: Relates heat flux to temperature gradient.
Q: Langmuir isotherm explains
A) Vapor pressure
B) Fluid flow
C) Adsorption
D) Evaporation
✅ Correct Answer: C
Explanation: Describes monolayer adsorption behavior.
Q: Bernoulli’s equation relates
A) Pressure, velocity, and height
B) Temperature and volume
C) Mass and time
D) Enthalpy and entropy
✅ Correct Answer: A
Explanation: Derived from energy conservation in fluids.
Q: Azeotropes are
A) Solids
B) Liquids
C) Constant boiling mixtures
D) Ideal gases
✅ Correct Answer: C
Explanation: Show fixed boiling behavior at certain compositions.
Q: Flash distillation is suitable for
A) High viscosity liquids
B) Binary mixtures
C) Solids
D) Reactive chemicals
✅ Correct Answer: B
Explanation: Separates components quickly using pressure/temperature drop.