Sticky material can be dried in a ________________ dryer ?
A. Tray
B. Rotary
C. Fluidised bed
D. None of these
Month: February 2019
Drying operation under vacuum is carried out to __________________?
Drying operation under vacuum is carried out to __________________?
A. Dry those materials which have very high unbound moisture content
B. Reduce drying temperature
C. Increase drying temperature
D. Dry materials having high bound moisture content
In case of absorption with exothermic reaction, for fluids having ___________________?
In case of absorption with exothermic reaction, for fluids having ___________________?
A. Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change
in the degree of turbulence
B. Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
C. Both A. and B.
D. Pr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of
turbulence
At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?
A. 0.0
B. 0.2
C. 0.4
D. 1.0
In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?
In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?
A. Increases
B. Decreases
C. Remains unchanged
D. Depends on the pressure of the system
In saturated gas, the__________________?
In saturated gas, the__________________?
A. Vapour is in equilibrium with the liquid at the gas temperature
B. Vapour is in equilibrium with the liquid at the room temperature
C. Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
D. None of these
Which of the following remains constant during sensible cooling process ?
Which of the following remains constant during sensible cooling process ?
A. Specific humidity
B. Partial pressure of vapour
C. Both A. and B.
D. Neither A. nor B.
For contacting a highly soluble gas with a liquid ____________________?
For contacting a highly soluble gas with a liquid ____________________?
A. Bubble the gas through liquid
B. Spray the liquid on gas stream
C. Either A. or B. would suffice
D. None of these
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?
The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?
A. Parallel
B. Straight
C. Both parallel and straight
D. Neither parallel nor straight
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?
A. Viscosity with concentration
B. Degree of ideality of the solution
C. Both A. and B.
D. Neither A. nor B.