Question 31 : Pick out the wrong statement.
1. Diffusion co-efficient and mass transfer co-efficient are not same in any mass transfer operation.
2. Contacting cold vapor-gas mixture with hot liquid exemplifies humidification process.
3. Mass transfer co-efficient does not account for gase-liquid diffusion.
4. Contacting cold liquid with warm vapor-gas mixture exemplifies dehumidification process.
View Answer   Discuss with Members

Question 32 : During constant rate drying period, vaporisation rate per unit drying surface area
1. does not change with time,
2. increases with time.
3. decreases with time.
4. does not affect the moisture content of the wet solid.
View Answer   Discuss with Members

Question 33 : In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be
1. 5 metres above ground.
2. at ground level.
3. 2 metres above the ground.
4. 10 metres above ground.
View Answer   Discuss with Members

Question 34 : Raschig ring made of procelain cannot be used for treating concentrated
1. sulphuric acid
2. hydrochloric acid
3. nitric acid
4. alkalis
View Answer   Discuss with Members

Question 35 : Fractional solvent extraction
1. none of these
2. results in low interfacial tension
3. employs only one solvent
4. employs two solvents
View Answer   Discuss with Members

Question 36 : _________ is concerned with the adsorption equilibria.
1. Fick's law
2. Gibb's equation
3. Freundlich equation
4. none of these
View Answer   Discuss with Members

Question 37 : In stripping section of continuous distillation column, the
1. liquid is enriched with high boiler.
2. vapour is stripped of low boiler.
3. none of these.
4. liquid is stripped of high boiler.
View Answer   Discuss with Members

Question 38 : Molality is defined as the number of gm moles of solute per __________ of solvent.
1. kg
2. m
3. gm
4. litre
View Answer   Discuss with Members

Question 39 : Danckwerts developed the __________ theory.
1. none of these
2. surface renewal
3. penetration
4. film
View Answer   Discuss with Members

Question 40 : __________ is the separation technique used for desalination of sea water.
1. absorption
2. Thermal diffusion
3. Reverse osmosis
4. Adsorption
View Answer   Discuss with Members