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: Zinc is commonly extracted from
A) Sphalerite
B) Chalcopyrite
C) Hematite
D) Bauxite
✅ Correct Answer: A
Explanation: Sphalerite (ZnS) is the main ore of zinc.
Q: The function of Raschig rings in a tower
A) Pressure reduction
B) Heat transfer
C) Absorption
D) Increase surface area
✅ Correct Answer: D
Explanation: Raschig rings provide more contact area for gas-liquid interactions in packed columns.
Q: Nusselt number relates to
A) Mass transfer
B) Momentum transfer
C) Heat flux
D) Convective heat transfer
✅ Correct Answer: D
Explanation: The Nusselt number measures the enhancement of heat transfer through convection.
Q: The key controlling parameter in distillation
A) Temperature gradient
B) Reflux ratio
C) Pressure
D) Tray diameter
✅ Correct Answer: B
Explanation: Reflux ratio directly affects purity and separation efficiency in distillation.
Q: Fouling in heat exchangers causes
A) Pressure drop
B) Enhanced flow
C) Increased efficiency
D) Insulation failure
✅ Correct Answer: A
Explanation: Fouling reduces heat transfer efficiency and causes pressure losses.