Chemical Engineering MCQs

6108 MCQs  (Page 168 of 611)

The minimum liquid rate to be used in an absorber corresponds to an operating line__________________?
A. Of slope = 1
B. Of slope = 0.1
C. Tangential to the equilibrium curve
D. None of these
For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a ____________ of the equilateral triangular co-ordinates?
A. Binary mixture is represented by the apex
B. Binary mixture is represented by any point inside
C. Ternary mixture is represented by the sides
D. Pure component is represented by the apex
Leaching of uranium ore and gold ore is done in_____________________?
A. Centrifugal extractor
B. Pachuca tanks
C. Bollman extractor
D. None of these
Powdery materials can be guarded against caking tendency on storage by___________________?
A. Providing irregular grain size
B. Providing minimum percentage of voids
C. Having maximum possible points of contact
D. None of these
In a gas-liquid absorption column, for obtaining the maximum absorption efficiency___________________?
A. Liquid stream should be distributed uniformly
B. Gas stream should be distributed uniformly
C. Both gas as well as liquid streams should be distributed uniformly
D. By passing should be completely avoided
Lewis number (Le) is____________________?
A. Sc × pr
B. Pr × st
C. Sh × pr
D. St × sh
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ______________ plate requirement?
A. No change in theoretical
B. Marginal decrease in the number of
C. Major decrease in the number of
D. None of these
To get high tray efficiency___________________?
A. Interfacial surface between liquid and gas phase should be large
B. Time of contact between the two phases should be less
C. Gas velocity should be very low
D. Liquid entrainment should be severe