Rerarding measuring the size, which method can be used for measuring the size distribution
of particles
of particles
Anonymous Quiz
7%
a-Microscopy
9%
d-Sieving and sedimentation
10%
b-Sieving
3%
c-Sedmentation
71%
e- Sieving sedimentation, and microscopy
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Regarding factors influencing milling, what Happens to materials with low melting points
during milling?
during milling?
Anonymous Quiz
9%
a-They remain unchanged
58%
B-They become soft and plastic
16%
c-They get degraded
12%
d-They become explosive
6%
E-They get hydrated
Regarding milling industrial process, what factor can hinder comminution and produce a
sticky mass upon milling?
sticky mass upon milling?
Anonymous Quiz
4%
a-Particle shape
54%
b-Moisture content
7%
c-Polymorphism
3%
d. Temperature
33%
e- All of the above
Regarding techniques of milling, what is the effect of an increase in moisture on the rate of
milling to a specified product size?
milling to a specified product size?
Anonymous Quiz
10%
a-It increases the rate of milling
51%
b-It decreases the rate of milling
8%
c-It has no effect on the rate of milling
8%
d-It depends on the type of material being milled
22%
e-Increase moisture content to 5% lead to wet milling
———— is a measure of the resistance to permanent deformation
Anonymous Quiz
20%
a-Young's modulus
13%
b- Elastic region
11%
c-Fracture point
6%
d-Plastic region
50%
e-Yield point
Regarding milling equipment, used for tough, fibrous materials
Anonymous Quiz
11%
a-roller mills
68%
b- cutter mills
12%
c- hammer mills
8%
d-ball mills
2%
e-fluid energy mills
Regarding milling application, milling has an impact on the following EXCEPT
Anonymous Quiz
9%
a- blending
11%
b- dissolution
54%
c-molecular weight
15%
d-drying
10%
e-formulation
Regarding ball mill, all of the following about ball mill are correct EXCEPT:
Anonymous Quiz
62%
a- The main mechanism of ball roll at low speed is by impaction and at high speed by attrition
15%
b-the ball mill consists of a horizontally rotating hollow vessel of cylindrical shape ...
6%
c- The mill is partially filled with balls of steel or pebbles, which act as the grinding medium
15%
d-Most ball mills utilized in pharmacy are batchoperated, however continuous bali mili are available
1%
e- The outlet is covered with a coarse screen to prevent the loss of the balls
✨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