Bachelor of Chemical Engineering Flashcards
7 cards from real BE/B Eng Bachelor of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Bachelor of Chemical Engineering flashcards as text
In a binary liquid-vapor system, what is an azeotrope?
Answer: A mixture whose vapor composition equals its liquid composition at a given T and P
An azeotrope is a mixture where the vapor and liquid have identical compositions, making separation by ordinary distillation impossible.
Which dimensionless number represents the ratio of momentum diffusivity to thermal diffusivity in a fluid?
Answer: Prandtl number
The Prandtl number (Pr = μcₚ/k = ν/α) is the ratio of kinematic viscosity (momentum diffusivity) to thermal diffusivity.
In process design, a 'pinch point' in a heat exchanger network represents:
Answer: The point where the hot and cold composite curves approach most closely (minimum ΔT)
The pinch point is where the hot and cold composite curves on a T-H diagram have the minimum temperature approach, setting the minimum utility requirements.
What is the purpose of a 'recycle stream' in a chemical process?
Answer: To return unreacted feed material to the reactor to improve overall conversion
Recycle streams return unconverted reactants from the separator back to the reactor inlet, increasing the overall conversion per pass through the process.
In electrochemical engineering, Faraday's law states that the mass of material deposited or dissolved is proportional to:
Answer: The total charge passed through the electrolyte
Faraday's law: m = (M·Q)/(n·F), where the deposited mass is directly proportional to the total charge Q passed through the cell.
Which type of flow regime in a fluidized bed is characterized by solid particles behaving like a boiling liquid with large bubbles rising through the bed?
Answer: Bubbling fluidization
Bubbling fluidization occurs when gas velocity exceeds the minimum fluidization velocity, causing gas bubbles to form and rise through the particle bed.
What is the primary advantage of using a packed column over a plate column in distillation?
Answer: Packed columns have lower pressure drop, making them suitable for vacuum distillation
Packed columns typically have lower pressure drop per theoretical stage compared to tray columns, making them preferred for vacuum and heat-sensitive distillations.