Regarding mixing, the following categories are all mixing mechanisms of fluid, EXCEPT
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63%
a-Radial motion
8%
b- Bulk transport
10%
c-Turbulent flow
4%
d-Laminar flow
14%
e-Molecular diffusion
Concerning in line liquid mixer, what is the most appropriate answer regarding in line
(continuous liquid mixing)
(continuous liquid mixing)
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12%
a- The in line liquid mixing produces an uninterrupted supply of freshly mixed material
24%
b- It is often desirable when very large volumes of materials are to be handled
10%
c- It can be accomplished essencally either in a tube through which the material flows or ....
5%
d- devices such as vanes, baffles, are placed in the mixing tub
49%
e- All of the above
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The milling mechanisms could be comminution mechanisms.
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4%
A-Cutting
2%
b-Attrition.
10%
c-Compression.
4%
d. Impact.
81%
e- All of them
Regarding miling techniques, which of the following techniques is applied to overcome the polymorphism problem during milling?
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25%
a-Using a hammer mill
37%
b- Using wet milling
14%
c-Using cutter mill
13%
d-Increase milling temperature.
11%
e-None of the above
Regarding to the selection of mill technique, the choice of a mill is based on
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5%
a-Cost
3%
b-Health hazards
3%
c-Cooling system
10%
d. Particles size
80%
e- All of the above
Regarding the concept of milling, what is milling?
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5%
A-The process of increasing the size of solids
79%
b. The process of reducing the size of solids
9%
C-The process of converting solids into liquids
3%
d. The process of separating solids from liquids
5%
e-The process of randomization of dissimilar materials
Regarding the size distribution, what is the conventionally used unit for expressing size in
milling?
milling?
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5%
a-Micron
7%
b-Millimeter
5%
c-Meter
82%
d. Mesh
1%
e- Nanometer
Rerarding measuring the size, which method can be used for measuring the size distribution
of particles
of particles
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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?
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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?
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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?
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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
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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
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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
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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:
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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?
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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..
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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?
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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
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1%
a- Feed chamber
3%
b- Grinding chamber
6%
c- Discharge chamber
6%
d-heater
84%
e- Feed chamber, Grinding chamber, and Discharge chamber