Chemical Engineering MCQs

6108 MCQs  (Page 205 of 611)

The expression, ln(F/W) = ∫xF xW [dx/y* – x)] is_____________________?
A. Differential distillation equation
B. For ntog in absorption for dilute mixture
C. Slope of q-line in mccabe-thiele method
D. For relative volatility
Molecular diffusion is caused by the________________?
A. Transfer of molecules from low concentration to high concentration region
B. Thermal energy of the molecules
C. Activation energy of the molecules
D. Potential energy of the molecules
The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by___________________?
A. Increasing the gas film co-efficient
B. Increasing the liquid film co-efficient
C. Increasing the total pressure
D. Decreasing the total pressure
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) ?
A. Increases pressure drop, increases surface area
B. Increases pressure drop, decreases surface area
C. Decreases pressure drop, increases surface area
D. Decreases pressure drop, decreases surface area
Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the_________________?
A. Relative volatility is reasonably constant
B. Mixture (to be separated) shows negative deviation from ideality
C. Mixture (to be separated) shows positive deviation from ideality
D. Multi-component distillation is involved