In high viscosity systems, what type of mixer efficiently mixes viscous ointments?
Anonymous Quiz
13%
a) Air jets, fluid jets, and high-speed propellers
25%
b) Flat blade turbine mixers
51%
c) Paddle mixers
12%
d) Sigma-blade mixers
What is the main mixing action employed for thicker pastes and plastic masses?
Anonymous Quiz
57%
a) Kneading, stretching, and folding
23%
b) High degree of turbulence and circulation
14%
c) Laminar mixing and molecular diffusion
6%
d) Generation of intense shearing forces
What type of mixer is commonly used for high viscosity systems with thick pastes and plastic
masses?
masses?
Anonymous Quiz
8%
a) Air jets, fluid jets, and high-speed propellers
16%
b) Flat blade turbine mixers
34%
c) Paddle mixers
42%
d) Sigma-blade mixers and muller mixers
Which type of flow properties do low solid-disperse phase concentrations in intermediate
viscosity systems exhibit?
viscosity systems exhibit?
Anonymous Quiz
27%
a) Non-Newtonian
22%
b) Newtonian
33%
c) Turbulent
18%
d) Laminar
👍1
In intermediate viscosity systems, what is the desired mixing method when the dispersed
components oppose settling?
components oppose settling?
Anonymous Quiz
30%
a) Increase the impeller size and decrease its speed
30%
b) Generate high degree of turbulence
27%
c) Rely on laminar mixing and molecular diffusion
12%
d) Use high-speed propellers
10- dIn high viscosity systems, what is the main function of paddle mixers?
Anonymous Quiz
10%
a) Generate turbulence within the bulk of the fluid
10%
b) Induce laminar mixing and molecular diffusion
76%
c) Produce shearing action between 2 surfaces in close proximity and moving at different velocities
3%
d) Create intense shearing forces
Why is mixing considered a critical factor in the manufacturing process of tablets or
granules?
granules?
Anonymous Quiz
10%
a) It affects the flowability of the powder
79%
b) It ensures a uniform distribution of additives and active ingredients
8%
c) It reduces the size of the particles
2%
d) It changes the shape of the particles
What is the best type of mix likely to be obtained in practice when mixing powders?
Anonymous Quiz
11%
a) Perfect mix
3%
b) Point uniformity
77%
c) Random mix
8%
d) Segregated mix
What is the main cause of segregation in powder mixes?
Anonymous Quiz
14%
a) Differences in particle shapes
7%
b) Differences in particle charges
65%
c) Differences in particle sizes
13%
d) Differences in processing techniques
Which particle shape exhibits the greatest flowability and is more easily mixed?
Anonymous Quiz
78%
a) Spherical
9%
b) Irregular
10%
c) Needle-shaped
3%
d) Cubic
What is an undesirable consequence of surface charging of particles during mixing?
Anonymous Quiz
27%
a) Increase in interparticulate diffusion
60%
b) Decrease in interparticulate diffusion
7%
c) Improved flowability
7%
d) Improved mixing efficiency
Which type of mixing involves the inversion of the powder bed using blades or paddles?
Anonymous Quiz
66%
a) Convective mixing/Macro mixing
15%
b) Shear mixing
9%
c) Diffusion mixing/Micro mixing
11%
d) Centrifugal mixing
What type of mixing breaks down forces of attraction, allowing each particle to move on its
own between regions of different components?
own between regions of different components?
Anonymous Quiz
13%
a) Convective mixing/Macro mixing
43%
b) Shear mixing
32%
c) Diffusion mixing/Micro mixing
12%
d) Centrifugal mixing
Which type of mixing involves the random motion of particles within the powder bed?
Anonymous Quiz
12%
a) Convective mixing/Macro mixing
3%
b) Shear mixing
71%
c) Diffusion mixing/Micro mixing
13%
d) Centrifugal mixing
How can segregation problems due to particle size differences be reduced?
Anonymous Quiz
10%
a) Increasing the moisture content of the powder
70%
b) Selecting particular sized fractions and milling of components
14%
c) Changing the shape of the particles
7%
d) Generating more surface charge during mixing
What can help reduce the tendency to segregate particles based on their shape?
Anonymous Quiz
86%
a) Controlled crystallization during production of the drug/excipients
6%
b) Increasing the moisture content of the powder
7%
c) Adding more additives to the mix
1%
d) Generating more surface charge during mixing
What is the main purpose of baffles, lifter blades, or container shape in tumbling mixers?
Anonymous Quiz
33%
a) To increase the speed of rotation
47%
b) To accentuate the tumbling motion
17%
c) To reduce the efficiency of the mixer
3%
d) To generate more heat during mixing
Which factor highly affects the efficiency of tumbling mixers?
Anonymous Quiz
54%
a) The geometric shape of the container
9%
b) The type of material being mixed
34%
c) The speed of rotation
3%
d) The size of the mixer
What advantage do agitator mixers have over tumblers for mixing solids?
Anonymous Quiz
8%
a) They depend entirely on gravity
74%
b) They are useful in mixing wetted, sticky, or plastic solids
18%
c) They are less efficient in breaking up lumps or aggregates
0%
d) They have lower shear forces