BE/B Eng Bachelor of Engineering Bachelor of Chemical Engineering 2

Question 1

In a distillation column, what does the 'reflux ratio' represent?

Accepted Answer

Ratio of liquid returned to distillate withdrawn

Answer

Ratio of vapor to liquid on a tray

Answer

Ratio of feed to bottoms flow rate

Answer

Ratio of reboiler duty to condenser duty

Question 2

Which dimensionless number characterizes the ratio of inertial forces to viscous forces in fluid flow?

Accepted Answer

Reynolds number

Answer

Prandtl number

Answer

Nusselt number

Answer

Grashof number

Question 3

What is the primary purpose of a heat exchanger's LMTD (Log Mean Temperature Difference)?

Accepted Answer

To determine the average driving force for heat transfer

Answer

To calculate the pressure drop across the exchanger

Answer

To find the shell-side velocity

Answer

To estimate fouling resistance

Question 4

In chemical kinetics, what does a second-order reaction with respect to reactant A mean?

Accepted Answer

The rate is proportional to the square of A's concentration

Answer

Two moles of A are produced per reaction

Answer

The rate doubles when temperature doubles

Answer

A reacts in two separate steps

Question 5

Which equation describes the pressure drop for incompressible fluid flow through a pipe?

Accepted Answer

Darcy-Weisbach equation

Answer

Clausius-Clapeyron equation

Answer

Hagen-Poiseuille restricted to laminar only

Answer

Bernoulli equation without friction terms

Question 6

What is the function of a catalyst in a chemical reaction?

Accepted Answer

Lowers the activation energy without being consumed

Answer

Increases the equilibrium conversion of reactants

Answer

Raises the reaction temperature for faster kinetics

Answer

Shifts the equilibrium toward products permanently

Question 7

In absorption operations, which property of the solvent is most critical for effective gas separation?

Accepted Answer

High selectivity and solubility for the target gas

Answer

High viscosity to retain gas bubbles

Answer

High volatility to recycle easily

Answer

Low density to maximize buoyancy