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.Management Sciences
Category: Mass Transfer
In stripping section of continuous distillation column, the_______________________?
A. Liquid is stripped of high boiler
B. Liquid is enriched with high boiler
C. Vapour is stripped of low boiler
D. None of these
Very tall packed towers are divided into series of beds to___________________?
A. Reduce the overall pressure drop
B. Avoid channelling
C. Reduce liquid hold-up
D. Avoid flooding
Tea percolation employs___________________________?
A. Liquid-liquid extraction
B. Leaching
C. Absorption
D. None of these
High pressure at the bottom of a distillation tower handling heat sensitive materials results in____________________?
A. Thermal decomposition of bottoms
B. Increased relative volatility
C. Erosion of the tower
D. Very efficient operation
At __________________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation?
A. Operating
B. Total
C. Minimum
D. Maximum permissible
Dryer widely used in a textile industry is ______________ dryer?
A. Festoon
B. Cylinder
C. Conveyor
D. Tunnel
With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent ?
A. Increases
B. Decreases
C. Remain same
D. Either A. or B., depends on the system
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 rough value of diffusion co-efficient of water vapor into air at 25°C may be about ______________ cm2/sec?
A. 0.25
B. 2.5
C. 1.25
D. 0.0025
Which of the following is not fixed by the process requirements, in the design of absorbers ?
A. Flow rate of the entering gas
B. Composition of the entering liquid
C. Terminal concentrations of gas stream
D. None of these
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