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.Management Sciences
Category: Mass Transfer
Which of the following remains constant during evaporative cooling process with recirculated water supply ?
A. Relative humidity
B. Partial pressure of vapour
C. Wet bulb temperature
D. None of these
Ion exchange process is similar to___________________?
A. Absorption
B. Adsorption
C. Extraction
D. Leaching
Which of the following is not a batch drier ?
A. Truck drier
B. Agitated pan drier
C. Fluidised bed drier
D. Vacuum shelf drier
A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))_____________?
A. M(Xo – XF)
B. M(Xo/XF)
C. M ln(Xo/XF)
D. MXo ln(Xo/XF)
In case of non-ideal gases and liquids, the molal diffusivity ________________?
A. Varies inversely as the pressure
B. Varies directly as the pressure
C. Is independent of pressure
D. Is equal to the volumetric diffusivity
‘ADDUCTS’ and ‘CLATHRATES’ are used in case of_____________________?
A. Extractive distillation
B. Crystallisation
C. Absorption
D. None of these
In an absorber, HETP does not vary with the____________________?
A. Flow rate of liquid
B. Flow rate of gas
C. Type and size of packing
D. None of these
In liquid extraction, if the selectivity is unity, then___________________?
A. Separation of the constituents is the most effective
B. No separation will occur
C. Amount of solvent required will be minimum
D. Solvent flow rate should be very low
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