Chemical Engineering MCQs

6108 MCQs  (Page 181 of 611)

In rectifying section of a continuous distillation column, the____________________?
A. Vapour is enriched with low boilers
B. Vapour is enriched with high boilers
C. Liquid is stripped of high boilers
D. None of these
Plate efficiency_______________________?
A. Is a function of the mass transfer between liquid and vapour
B. Increases due to foaming
C. Increases due to liquid entrainment
D. Increases due to weeping and dumping of liquid
Weeping in a distillation column_____________________?
A. Increases tray efficiency
B. Provides large interfacial surface for mass transfer
C. Results due to very high gas velocity
D. Results due to very low gas velocity
In McCabe-Thiele method, at infinite reflux ratio___________________?
A. Number of plates is maximum
B. Overhead product is maximum
C. Both the operating lines coincide with the diagram
D. None of these
The expression, y(1 – x)/x(1 – y) is for_____________________?
A. Absorption factor
B. Relative volatility
C. Selectivity
D. Murphree efficiency
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?
A. Packing may be crushed due to thermal expansion/contraction of the components of the
EquIpments
B. Pressure drop in the equipment will be very high
C. Viscosity variation of the fluids may cause channelling/flooding
A binary mixture of benzene and cyclohexane is separated by___________________?
A. Flash vaporisation
B. Extractive distillation
C. Solvent extraction
D. Ordinary distillation