Means the amount of heat thrown away (KCal/hr.) by the cooling tower
Is equal to the number of kg, of water circulated times the cooling range
Both A & B
Neither A nor B
✅ The correct answer is option C.
Mass Transfer MCQs
Low viscosity absorbent is preferred for reasons of
Rapid absorption rates and good heat transfer characteristics
Improved flooding characteristics
Low pressure drop on pumping
All of the above
✅ The correct answer is option D.
__________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation.
Furfural
Benzol
Butyl acetate
Hexane
✅ The correct answer is option C.
Stage efficiency in a leaching process depends on the
Time of contact between the solid and the solution
Rate of diffusion of the solute through the solid and into the liquid
Both A & B
Vapour pressure of the solution
✅ The correct answer is option C.
Large quantity of silica gel is normally dried in a __________ dryer.
Freeze
Through circulation
Rotary vacuum
Tray
✅ The correct answer is option B.
Extraction of coffee from its seed is done by
Liquid-liquid extraction
Leaching
Extractive distillation
Steam distillation
✅ The correct answer is option B.
Absorption factor is defined as (where, S₁ = slope of the operating line S₂ = slope of the equilibrium curve)
S₂/S₁
S₁/S₂
S₁ – S₂
S₁ x S₂
✅ The correct answer is option B.
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.
5
9
12
28
✅ The correct answer is option C.
(NRe . NSc) is termed in mass transfer operation as the __________ number.
Stanton
Sherwood
Peclet
None of these
✅ The correct answer is option C.
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is
0.048
0.079
0.122
0.152
✅ The correct answer is option D.