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: Reynolds number helps to determine
A) Fluid velocity
B) Flow regime
C) Heat transfer rate
D) Pressure loss
✅ Correct Answer: B
Explanation: Indicates laminar or turbulent flow.
Q: Flash point is the temperature at which
A) Liquid freezes
B) Vapor ignites briefly
C) Liquid boils
D) Auto-ignition happens
✅ Correct Answer: B
Explanation: Flash point is crucial for safety.
Q: Centrifugal pumps are typically used for
A) High pressure
B) High viscosity
C) Low flow
D) Low viscosity
✅ Correct Answer: D
Explanation: Suitable for low-viscosity fluids.
Q: Hydraulic diameter is relevant in
A) Compressors
B) Open channels
C) Heat exchangers
D) Packed towers
✅ Correct Answer: C
Explanation: Used in non-circular duct flow calculations.
Q: Most common refrigerant in air-conditioning systems
A) Helium
B) Freon
C) Ammonia
D) CO₂
✅ Correct Answer: B
Explanation: Freon (CFCs) is widely used.