Which type of mixer is preferred when a small volume of liquid is to be mixed with a large
quantity of solids?
quantity of solids?
Anonymous Quiz
27%
a) Sigma-blade mixer
11%
b) Planetary mixer
18%
c) Mulling mixer
44%
d) Roller mill
❤1
In solid-liquid mixing, what is the main purpose of adding the liquid slowly?
Anonymous Quiz
10%
a) To facilitate even distribution of particles
86%
b) To reduce the tendency of the particles to form a lump
2%
c) To create a vortex in the mixing vessel
2%
d) To increase the viscosity of the mixture
❤1
What type of equipment is used when solid particles tend to stick together due to the surface
tension of the coating liquid?
tension of the coating liquid?
Anonymous Quiz
56%
a) Equipment for pastes
16%
b) Equipment for fluids mixing
21%
c) Equipment for solids mixing
7%
d) Equipment for liquid-liquid mixing
❤3
What type of equipment is used when solid particles remain essentially free-flowing after
mixing with a liquid?
mixing with a liquid?
Anonymous Quiz
2%
a) Equipment for pastes
24%
b) Equipment for fluids mixing
68%
c) Equipment for solids mixing
6%
d) Equipment for liquid-liquid mixing
❤2
What is the main advantage of using a three-roller mill?
Anonymous Quiz
3%
a) It provides a vortex in the mixing vessel
33%
b) It is more efficient in distributing particles uniformly
4%
c) It is suitable for high viscosity fluids
60%
d) It allows for better crushing and shearing of the material
❤1
What is the primary factor in selecting appropriate mixing equipment?
Anonymous Quiz
36%
a) Economic considerations
10%
b) Time required for mixing
37%
c) Viscosity of the liquids
17%
d) Maintenance of the equipment
❤1
Which type of mixing device is suitable for low viscosity systems?
Anonymous Quiz
84%
a) Air jets, fluid jets, and high-speed propellers
6%
b) Flat blade turbine mixers
6%
c) Paddle mixers
4%
d) Sigma-blade mixers
What is the practical upper limit of viscosity for the application of devices used in low
viscosity systems?
viscosity systems?
Anonymous Quiz
78%
a) 10 poises
3%
b) 100 poises
9%
c) 1,000 poises
10%
d) 10,000 poises
In intermediate viscosity systems, what type of impeller is suitable for mixing fluids that are
difficult to generate turbulence within their bulk?
difficult to generate turbulence within their bulk?
Anonymous Quiz
16%
a) High-speed propellers
62%
b) Turbine with flat blade design
16%
c) Paddle mixers
7%
d) Sigma-blade mixers
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