Dry bulb temperature of the gas is _____________ the wet bulb temperature?
A. Less than
B. More than
C. Equal to
D. None of these
Month: February 2019
Which of the following is not a unit of mass transfer co-efficient ?
Which of the following is not a unit of mass transfer co-efficient ?
A. Moles transferred/ [(time) (area) (mole fraction)]
B. Moles transferred/ [(time) (area) (mass A/mass B)]
C. Moles transferred/ [(time) (area) (pressure)]
D. None of these
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases ‘A’ and ‘B’ is____________?
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases ‘A’ and ‘B’ is____________?
A. 1
B. ∞
C. 0.5
D. 2
Rose oil is extracted from rose leaves using ____________ distillation?
Rose oil is extracted from rose leaves using ____________ distillation?
A. High pressure
B. Low pressure
C. Extractive
D. Steam
Back-trapping in a distillation column ?
Back-trapg in a distillation column ?
A. Increases tray efficiency
B. Decreases tray efficiency
C. Reduces pressure drop
D. Is desirable, as it provides improved vapour-liquid contact
In the constant rate period of the rate of drying curve for batch drying,_________________?
In the constant rate period of the rate of drying curve for batch drying,_________________?
A. Cracks develop on the surface of the solid
B. Rate of drying decreases abruptly
C. Surface evaporation of unbound moisture occurs
D. None of these
The most economical range of absorption factor is____________________?
The most economical range of absorption factor is____________________?
A. 0 to 0.5
B. 0 to 3
C. 1.25 to 2
D. 5 to 15
In case of absorption, both the operating and equilibrium lines will be straight for______________?
In case of absorption, both the operating and equilibrium lines will be straight for______________?
A. Isothermal operation
B. Dilute solutions
C. Dilute solutions and isothermal operation
D. None of these
Bollman extractor___________________?
Bollman extractor___________________?
A. Is a static bed leaching equipment
B. Is used for extraction of oil from oilseed
C. Is a centrifugal extractor
D. Employs only counter-current extraction
When the solvent dissolves very little of solute, then__________________________?
When the solvent dissolves very little of solute, then__________________________?
A. Solvent of low latent heat of vaporisation should be used
B. Solvent of low freezing point should be used
C. Large quantity of solvent is required to extract the solute
D. Very small quantity of solvent is required