✨طريقك نحو الرسوب✨
Regarding ball mill, all of the following about ball mill are correct EXCEPT:
الجواب a ، بس تكملة الb بالملاحظة خاف تريدون تقرون التكملة
Theory of comminution, What is true about the stress-diagram theory of comminution?
Anonymous Quiz
13%
a- The initial linear portion of the curve is defined by Young's law.
24%
b-Hooke's law expresses the stiffness or softness of a solid in dyne/cm2
18%
c- The stress-strain curve is linear beyond the yield point.
19%
d. The area under the curve represents the material's impact strength.
26%
e- The material is reversibly deformed when the force of impact does not go beyond range of Hooke
The choice of a mill, The choice of a mill is based on..
Anonymous Quiz
7%
a-capacity of the mill and production rate requirements
2%
b- ease of cleaning and sterilization
7%
c-versatility of operation
4%
d-auxiliary equipment
80%
e- All of the above
Type of mills, which type of mills can be used for size reduction of material from fresh
plant source?
plant source?
Anonymous Quiz
17%
a-Colloidal mill
15%
b- hammer mill
50%
c-Cutter mill
15%
d-roller mill
3%
e-ball mill
Methods of milling, a mill consist of the following
Anonymous Quiz
1%
a- Feed chamber
3%
b- Grinding chamber
6%
c- Discharge chamber
6%
d-heater
84%
e- Feed chamber, Grinding chamber, and Discharge chamber
Theory of drying showed that when drying rate is equal to zero, the temperature and
moisture content is:
moisture content is:
Anonymous Quiz
17%
a- Decreased
7%
b- increased
54%
c-remain constant
18%
d. equal to 100%
4%
e-equal to 50%
Regarding psychrometry study and its applications in drying, which of the following can
best define psychrometry?
best define psychrometry?
Anonymous Quiz
75%
a-Determines the vapor concentration and carrying capacity of the gas (air).
4%
b-Actual air temperature
13%
c-Equilibrium moisture content (EMC).
5%
d-Bound water.
4%
e-None of the above.
Regarding drying systems, spray dryer is:
Anonymous Quiz
12%
a- Specialized dryer
7%
b-Moved bed dryer
9%
c-Static bed dryer
51%
d-Pneumatic dryer
21%
e-All of the above
According to drying, which type of f dever result in uniform distribution
of heat.
of heat.
Anonymous Quiz
18%
a- Moving-bed dryers
37%
b- Fluidized-bed dryers
12%
c- Pneumatic dryers
18%
d-Static-bed dryers
15%
e- All of the above
Regarding to the dryer, advantage(s) of Fluidized Bed Dryer
Anonymous Quiz
8%
a-High drying rate due to efficient heat and mass transfer
9%
b-The drying occur at constant rate because all the surface of particles subjected to heat uniformly
8%
c-More spherical freeflowing particles can obtained reduce the problems of aggregation & migration
15%
d-Both a and b
60%
e-All a, b and c
Regarding to non-thermal method of sterilization, a number of vitamins, antibiotics and
hormones in the dry state have been successfully sterilized
hormones in the dry state have been successfully sterilized
Anonymous Quiz
15%
a-Dry heat
9%
b-Moist heat
35%
c- Radiation
16%
d-Surface disinfection
25%
e-None of the above
All the following statements are true regarding drying EXCEPT
Anonymous Quiz
11%
a- The extraction of liquid from a solid is a form of drying
15%
b-Drying and evaporation are different terms
12%
c- Thermal and non-thermal methods could be used for drying
44%
d-Drying is the complete removal of liquid from the material
17%
e-In drying moisture is transferred from the material inte an unsaturated vapor phase
Regarding drying, Non-thermal method/s of drying is/are
Anonymous Quiz
7%
a- squeezing of a wetted sponge
9%
b-extraction of liquid from a solid by use of a solvent
5%
c-use of desiccants
5%
d. use of a sulfuric acid column
74%
e. All of the above
Regarding solid drying, the ratio of the wt of water in sample to wt of drys multiply by
%100 isknown as
%100 isknown as
Anonymous Quiz
13%
a dry wt
11%
b-wet wt
18%
C-LOD
53%
d- MC
6%
e-None of the above
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Regarding industrial processing, what is industrial processing that provides reduction the
bulk and the weight of materials
bulk and the weight of materials
Anonymous Quiz
3%
a-mixing
18%
b-Milling
71%
c- drying
5%
d-Filtration
3%
e-Sterilization
Regarding drying of solids, the data from drying rate is plotted as moisture content versus
time, at no more moisture is replaced and dry spot appears that represent
time, at no more moisture is replaced and dry spot appears that represent
Anonymous Quiz
13%
a- Equilibrium moisture content
53%
b-Critical moisture content
14%
c-First falling rate period
12%
d-Second falling rate period
8%
e-Constant rate period
Regarding theory of drying, the driving force for heat transfer during drying process is:
Anonymous Quiz
35%
a-Temperature differential
9%
b-The rate of evaporation
15%
c-The latent heat of vaporization
7%
d. The rate of diffusion of moisture
34%
e- All of the above
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Regarding type of dryers, what are factors affecting selection of dryer?
Anonymous Quiz
16%
a-Heat sensitivity of the material to be dried and physical nature of the material
6%
b-Nature of liquid to be removed and the scale of operation
70%
c-Heat sensitivity of the material to be dried, physical nature of the material, nature of liquid ..
4%
d. The scale of operation
3%
e-Physical nature of the material
🔥1
Regarding drying, for effective drying conditions which processing factor is essential?
Anonymous Quiz
7%
a-size
8%
b-Weight
7%
c-Pressure
72%
d. Humidity
7%
e-None of the above
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