Chemical Engineering MCQs
Chemical Engineering MCQs cover process calculations, heat/mass transfer, reaction engineering, plant design, safety, and environment, helping FPSC, PPSC, NTS candidates and graduates strengthen concepts, match exam trends, and prepare for competitive tests and chemical industry careers.
Q: Mean free path is important in
A) Thermodynamics
B) Surface tension
C) Mass transfer
D) Molecular diffusion
✅ Correct Answer: D
Explanation: Average distance between molecular collisions.
Q: Spray dryers convert
A) Gas to solid
B) Vapor to liquid
C) Liquid to powder
D) Powder to liquid
✅ Correct Answer: C
Explanation: Used for drying heat-sensitive materials.
Q: In distillation, higher reflux ratio leads to
A) Less purity
B) Higher separation
C) Shorter column
D) Lower efficiency
✅ Correct Answer: B
Explanation: Improves separation of components.
Q: Absorption accompanied by chemical reaction is called
A) Reactive absorption
B) Simple absorption
C) Dissolution
D) Chemisorption
✅ Correct Answer: D
Explanation: Chemical bonding involved in absorption.
Q: Critical point is when
A) Solid = Liquid
B) Vapor = Solid
C) Liquid = Vapor
D) No phase exists
✅ Correct Answer: C
Explanation: At this point, gas and liquid become indistinguishable.