What is the effect of milling on the surface area per unit weight of a particle?
Anonymous Quiz
3%
a) No change
79%
b) Increases
15%
c) Decreases
4%
d) Cannot be determined
❤1👨💻1
Which of the following is NOT a pharmaceutical application affected by milling?
Anonymous Quiz
3%
a) Dissolution and therapeutic efficacy
0%
b) Extraction
3%
c) Drying
94%
d) Flavor enhancement
❤2
How does milling affect the drying process of wet masses?
Anonymous Quiz
28%
a) Increases drying time
55%
b) Decreases drying time
1%
c) No effect on drying time
16%
d) Drying time depends on the specific material
❤1
Which pharmaceutical application benefits from milling by ensuring uniform product
production?
production?
Anonymous Quiz
19%
a) Dissolution and therapeutic efficacy
5%
b) Extraction
15%
c) Drying
61%
d) Flowability
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In the context of mixing or blending solid pharmaceutical ingredients, why is milling
beneficial?
beneficial?
Anonymous Quiz
7%
a) It increases the viscosity of the mixture
77%
b) It provides a greater uniformity of dose
10%
c) It reduces the need for additional ingredients
6%
d) It enhances the flavor of the final product
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How does milling affect the function of lubricants in compressed tablets and capsules?
Anonymous Quiz
6%
a) It reduces the effectiveness of lubricants
3%
b) It has no effect on lubricant function
90%
c) It enhances the function of lubricants by creating a fine particle size
1%
d) It changes the chemical composition of the lubricants
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What is the stress-strain curve used to illustrate?
Anonymous Quiz
4%
a) The viscosity of liquids
86%
b) The mechanical behavior of solids under stress
5%
c) The heat transfer in solids
5%
d) The electrical conductivity of materials
What is Hooke's law in the context of stress-strain curve?
Anonymous Quiz
6%
a) Stress is inversely proportional to strain
85%
b) Stress is directly proportional to strain
3%
c) Strain is directly proportional to the temperature
7%
d) Stress is proportional to the square of the strain
❤1
What does Young's modulus represent in the stress-strain curve?
Anonymous Quiz
13%
a) The yield point of the material
81%
b) The stiffness or softness of a solid
5%
c) The energy of fracture
1%
d) The impact strength of the material
What does the yield point on the stress-strain curve indicate?
Anonymous Quiz
79%
a) The resistance to permanent deformation
8%
b) The elastic limit of a materia
7%
c) The start of the linear portion of the curve
6%
d) The maximum stress a material can withstand
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In milling processes, which statement is true regarding particle fracturing?
Anonymous Quiz
8%
a) Particle fracturing is deterministic
63%
b) Particle fracturing is random
23%
c) Particle fracturing always produces uniform particle sizes
6%
d) Particle fracturing is unaffected by the impact energy
❤1
What happens when a material is subjected to a force that does not exceed the elastic limit?
Anonymous Quiz
16%
a) The material undergoes irreversible deformation
6%
b) The material is permanently fractured
76%
c) The material experiences reversible deformation or stress
2%
d) The material loses all its mechanical properties
❤1
What is the useful work in milling proportional to?
Anonymous Quiz
69%
a) The length of new cracks produced
19%
b) The size of the particles
10%
c) The force applied during milling
1%
d) The temperature of the material
What are the four main methods of effecting size reduction in mills?
Anonymous Quiz
96%
a) Cutting, compression, impact, and attrition
1%
b) Heating, cooling, compression, and impact
3%
c) Impact, cutting, stretching, and compression
0%
d) Attrition, heating, cooling, and cutting
❤1
How does the cutting method of size reduction work?
Anonymous Quiz
92%
a) By applying force over a narrow area using a sharp edge
3%
b) By gripping the material between two surfaces and applying pressure
5%
c) By creating internal stresses in the particle using a fast-moving part
1%
d) By subjecting the material to pressure and shear forces
❤1
What is the primary mechanism of size reduction in attrition?
Anonymous Quiz
7%
a) Cutting with a sharp edge
14%
b) Application of pressure between two surfaces
10%
c) Creation of internal stresses using a fast-moving part
70%
d) Application of pressure and shear forces between moving surfaces
👎1
What are the three basic parts of a mill?
Anonymous Quiz
29%
a) Grinding chamber, feed chute, and discharge chute
4%
b) Rotor, stator, and classifier
66%
c) Feed chute, grinding mechanism, and discharge chute
2%
d) Classifier, grinding chamber, and rotor
🤝1
What type of material is best suited for cutting mills?
Anonymous Quiz
3%
a) Soft, flexible materials
86%
b) Tough, fibrous materials
8%
c) Granular, crystalline materials
3%
d) Fine powders
What is the primary mechanism of size reduction in roller mills?
Anonymous Quiz
8%
a) Impact
14%
b) Attritio
7%
c) Cutting
70%
d) Compression and shearing
🤝1
In a hammer mill, what happens to the material that is small enough to pass through the
screen?
screen?
Anonymous Quiz
14%
a) It is further ground by the hammers
20%
b) It is retained for additional size reduction
59%
c) It is discharged almost as fast as it is formed
7%
d) It is sent to a classifier for further processing
Which factors affect the particle size achievable in a hammer mill?
Anonymous Quiz
49%
a) Type of milling tool, rotor speed, and solid density in the mill
13%
b) Hammer tip speed, screen thickness, and type of milling tool
7%
c) Rotor speed, screen size, and solid feed rate
31%
d) Hammer tip speed and hammer mill screen size