Chemical Engineering MCQs

6108 MCQs  (Page 185 of 611)

Which of the following operations does not involve leaching ?
A. Dissolving gold from ores
B. Dissolving pharmaceutical products from bark or roots
C. Dissolving sugar from the cells of the beet
D. Removing nicotine from its water solution by kerosene
Flooding in a distillation column is detected by a sharp ___________________?
A. Increase in murphree plate efficiency
B. Decrease in pressure drop
C. Decrease in liquid hold up in the column
D. Increase in pressure drop
Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if____________________?
A. Mass transfer is accompanied by reaction
B. Diffusion of a is in stagnant medium b
C. Molecular mean free path is high
D. There is equimolar counter diffusion
Absorption accompanied by heat evolution results in____________________?
A. Increased capacity of the absorber
B. Increase in equilibrium solubility
C. Decrease in equilibrium solubility
D. None of these
The solvent used in liquid extraction should not have high latent heat of vaporisation, because ______________________?
A. The pressure drop and hence the pumping cost will be very high
B. It cannot be recovered by distillation
C. Its recovery cost by distillation may be prohibitively high
D. It will decompose while recovering by distillation