M(Xo – XF)
M(Xo/XF)
M ln(Xo/XF)
MXo ln(Xo/XF)
✅ The correct answer is option D.
Mass Transfer MCQs
The ‘shanks system’ of leaching (i.e., counter-current multiple contact leaching) is used for
Recovery of tannis from the tree barks and woods
Leaching sodium nitrate from Chilean nitrate bearing rock
Both A & B
Neither A nor B
✅ The correct answer is option C.
The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity Dsub>BA (for component B diffusing in A) for a binary mixture of
Newtonion liquids
Non-Newtonion liquids
Ideal gases
Real gases
✅ The correct answer is option C.
Dew point of an air-water vapor mixture
Decreases with decrease in pressure
At constant humidity & total pressure is fixed
Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
All of the above
✅ The correct answer is option D.
With increase in temperature, the leaching rate increases because of the
Increased diffusivity
Decreased viscosity of liquid
Both A and B
Neither A nor B
✅ The correct answer is option C.
Which of the following is an undesirable property in a tower packing?
Large surface per unit volume
Large free cross-section
Low weight per unit volume
Large weight of liquid retained
✅ The correct answer is option D.
Leaching of coarse solid lumps is also termed as
Decoction
Dissolution
Percolation
Agitation and settling
✅ The correct answer is option C.
Which of the following employs an accessory known as ‘drift eliminator’ ?
Multiple effect evaporator
Mechanical draft cooling tower
Rotary dryer
Rotating disc contactor
✅ The correct answer is option B.
The recovery of pencillin from the acidified fermentation broth is done by
Distillation
Evaporation
Absorption
Liquid extraction
✅ The correct answer is option D.
‘Absorption with chemical reaction’ is involved in the removal of
Carbon dioxide from gaseous stream using alkaline solution
Benzol from coke oven gas using solar oil/wash oil
Ammonia from coke oven gas using refrigerated water
Tar from coke oven gas in primary gas coolers using chilled water
✅ The correct answer is option A.