Which material are not used in drying in a freeze dryer?
Anonymous Quiz
16%
Seafood
16%
Fruits
43%
Pharmaceuticals
25%
Hormone
The final removal of liquid from solids by vaporization with the aid of heat is known as :
Anonymous Quiz
27%
Evaporration
48%
Drying
16%
Sublimation
8%
Desiccation
Drying involves .....transfer operation
Anonymous Quiz
15%
Mass
22%
Heat
61%
Mass & heat
2%
Either mass or heat
The adsorption of water from a solvent by the use of desiccants such as
Anonymous Quiz
60%
Anhydrous calcium chlorid
16%
Hydrous calcium chlorid
8%
Sulfuric acid
15%
Silica gel
Moisture removing material
Anonymous Quiz
20%
Anhydrous ca cl
10%
Hydrous ca cl
21%
Sulferic acid
50%
Silica gel
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Dried products are more stable such as
Anonymous Quiz
9%
Aspririn
10%
Penicillin
7%
Ascrobic acid
74%
All of them
Psychrometry detemine
Anonymous Quiz
8%
The vapor concetration
6%
Carrying capacity of the gas
80%
The vapor conc. and carrying capacity of the gas
6%
None of them
The conc. Of water vapor in gas is called
Anonymous Quiz
9%
Drying
25%
Evaporation
64%
Humidity
2%
None of them
CDE curve is the saturation humidity ( absolut humidity) at which the partial pressure of water vapor in the air .... the vapor pressure of free water at the same temperature
Anonymous Quiz
76%
Equal
12%
Higher
10%
Below
3%
None of them
Actual air temperature is measured by ordinary thermometer
Anonymous Quiz
23%
Wet bulb temp
77%
Dry bulb temp
When considering how to dry a material certain points should be considered except
Anonymous Quiz
25%
Heat sensitivty of the material to be dried
12%
Physical nature of the material
42%
Nature of solid to be removed
21%
The scale of operation
👍1
This type is a continuous shelf moving bed dryer consists of series of rotating annular trays arranged in a vertical stack rotating slwoly at 0.1 to 1.0 rpm
Anonymous Quiz
20%
Static bed system
56%
Turbo tray dryers
19%
Fluidized bed systems
5%
Pneumatic systems
Which of the following is an example of a non-thermal method of drying ?
Anonymous Quiz
20%
Heating a solid to remove liquid
55%
Seqeezing a wetted sponge
20%
Spraying a liquid onto a solid to remove the moisture
5%
None of above
❤1
What type of heat transfer is used in microwave drying ?
Anonymous Quiz
11%
Conduction
11%
Convection
34%
Radiation
43%
All of the above
How is loss on drying (LOD) calculating ?
Anonymous Quiz
27%
Wt of dry sample / wt of water in sample )* 100
63%
Wt of water in sample / wt of wet sample)*100
11%
Wt of wet sample / wt of water in sample )*100
❤1
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Which material are not used in drying in a freeze dryer?
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