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: Isothermal process maintains constant
A) Volume
B) Entropy
C) Pressure
D) Temperature
✅ Correct Answer: D
Explanation: Isothermal means constant temperature.
Q: Entropy is a measure of
A) Energy
B) Heat
C) Pressure
D) Disorder
✅ Correct Answer: D
Explanation: Thermodynamic property indicating randomness.
Q: In P&ID diagrams, control valves are represented by
A) Diamonds
B) Squares
C) Triangles
D) Circles
✅ Correct Answer: C
Explanation: Symbols are standardized in instrumentation.
Q: Gas absorption is best when gas solubility is
A) Low
B) Constant
C) Negative
D) High
✅ Correct Answer: D
Explanation: Greater solubility improves absorption.
Q: First law of thermodynamics deals with
A) Heat loss
B) Energy conservation
C) Entropy
D) Power generation
✅ Correct Answer: B
Explanation: Energy can neither be created nor destroyed.
Q: Pressure drop in packed bed increases with
A) Channeling
B) Low viscosity
C) Less flow
D) High particle size
✅ Correct Answer: A
Explanation: Maldistribution raises pressure drop.
Q: Common drying mechanism
A) Radiation
B) Diffusion
C) Convection
D) All of these
✅ Correct Answer: D
Explanation: All may be involved depending on setup.
Q: Bubble point occurs when
A) Saturated liquid
B) Liquid is fully vaporized
C) Liquid starts boiling
D) Vapor condenses
✅ Correct Answer: C
Explanation: First vapor appears at bubble point.
Q: Activated sludge process is for
A) Sterilization
B) Water softening
C) Wastewater treatment
D) Oil recovery
✅ Correct Answer: C
Explanation: Biological method for treating sewage.
Q: Main use of venturi meter
A) Absorb shocks
B) Control temperature
C) Compress gases
D) Measure flow rate
✅ Correct Answer: D
Explanation: Uses pressure change to measure flow.