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February 2019

As the reflux ratio in a distillation column is increased from the minimum, the______________________?

Mass Transfer /
As the reflux ratio in a distillation column is increased from the minimum, the______________________?

A. Slope of the operating line in stripg section decreases
B. Number of plates decreases very slowly first and then more and more rapidly
C. Total cost first decreases and then increases
D. Liquid flow increases while the vapor flow decreases for a system

As the reflux ratio in a distillation column is increased from the minimum, the______________________? Read More »

Mass Transfer

Positive deviation from Raoult’s law means a mixture whose total pressure is___________________?

Mass Transfer /
Positive deviation from Raoult’s law means a mixture whose total pressure is___________________?

A. Greater than that computed for ideality
B. Less than that computed for ideality
C. Less than the sum of the vapour pressure of the components
D. None of these

Positive deviation from Raoult’s law means a mixture whose total pressure is___________________? Read More »

Mass Transfer

One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ?

Mass Transfer /
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ?

A. The product composition but not the fraction vaporised
B. The product composition as well as the fraction vaporised
C. The fraction vaporised but not the product composition
D. Neither the product composition nor the fraction vaporised

One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ? Read More »

Mass Transfer

The rate of solid-liquid extraction is limited by the_________________?

Mass Transfer /
The rate of solid-liquid extraction is limited by the_________________?

A. Phase change of the solute as it dissolves in the solvent
B. Diffusion of the solute through the solvent in the pores to the outside of the particle
C. Diffusion of the solute from the solution in contact with the particle to the main bulk of the
solution
D. All A , B. & C.

The rate of solid-liquid extraction is limited by the_________________? Read More »

Mass Transfer