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: Vapor pressure increases with
A) Decreasing temperature
B) Increasing temperature
C) Increasing altitude
D) Adding solids
✅ Correct Answer: B
Explanation: Temperature drives vapor pressure up.
Q: Main reason for using baffles in reactors
A) Prevent sedimentation
B) Increase cost
C) Reduce reaction
D) Improve mixing
✅ Correct Answer: D
Explanation: Ensures proper agitation.
Q: Residence time distribution is important for
A) Kinetic data
B) All of these
C) Ideal mixing assumption
D) Equipment sizing
✅ Correct Answer: B
Explanation: Affects reactor design and conversion.
Q: BOD removal in aeration tank involves
A) Adsorption
B) Precipitation
C) Sedimentation
D) Microbial degradation
✅ Correct Answer: D
Explanation: Bacteria break down organic matter.
Q: Solubility of gases in liquids decreases with
A) Agitation
B) Temperature
C) Pressure
D) Mixing
✅ Correct Answer: B
Explanation: Gases are less soluble at higher temperatures.