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 distillation column, what does the 'reflux ratio' represent?
Answer: Ratio of liquid returned to distillate withdrawn
The reflux ratio is the ratio of liquid returned to the top of the column to the distillate product withdrawn.
Which dimensionless number characterizes the ratio of inertial forces to viscous forces in fluid flow?
Answer: Reynolds number
The Reynolds number (Re = ρvL/μ) is the ratio of inertial to viscous forces and determines whether flow is laminar or turbulent.
What is the primary purpose of a heat exchanger's LMTD (Log Mean Temperature Difference)?
Answer: To determine the average driving force for heat transfer
LMTD represents the effective average temperature difference driving heat transfer between the two fluid streams.
In chemical kinetics, what does a second-order reaction with respect to reactant A mean?
Answer: The rate is proportional to the square of A's concentration
A second-order reaction in A means the rate law is r = k[A]², so doubling [A] quadruples the reaction rate.
Which equation describes the pressure drop for incompressible fluid flow through a pipe?
Answer: Darcy-Weisbach equation
The Darcy-Weisbach equation (ΔP = f·L/D·ρv²/2) applies to both laminar and turbulent incompressible flow in pipes.
What is the function of a catalyst in a chemical reaction?
Answer: Lowers the activation energy without being consumed
A catalyst provides an alternative reaction pathway with lower activation energy and is regenerated at the end of the reaction.
In absorption operations, which property of the solvent is most critical for effective gas separation?
Answer: High selectivity and solubility for the target gas
An effective absorption solvent must have high selectivity and solubility for the target component to achieve efficient separation.