{ "@context": "https://schema.org", "@type": "Organization", "name": "Brainscape", "url": "https://www.brainscape.com/", "logo": "https://www.brainscape.com/pks/images/cms/public-views/shared/Brainscape-logo-c4e172b280b4616f7fda.svg", "sameAs": [ "https://www.facebook.com/Brainscape", "https://x.com/brainscape", "https://www.linkedin.com/company/brainscape", "https://www.instagram.com/brainscape/", "https://www.tiktok.com/@brainscapeu", "https://www.pinterest.com/brainscape/", "https://www.youtube.com/@BrainscapeNY" ], "contactPoint": { "@type": "ContactPoint", "telephone": "(929) 334-4005", "contactType": "customer service", "availableLanguage": ["English"] }, "founder": { "@type": "Person", "name": "Andrew Cohen" }, "description": "Brainscape’s spaced repetition system is proven to DOUBLE learning results! Find, make, and study flashcards online or in our mobile app. Serious learners only.", "address": { "@type": "PostalAddress", "streetAddress": "159 W 25th St, Ste 517", "addressLocality": "New York", "addressRegion": "NY", "postalCode": "10001", "addressCountry": "USA" } }
Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

PARTECH (quiz 2) > size enlargement > Flashcards

size enlargement Flashcards

(60 cards)

Start Studying
1
Q

It is a particle that are set in motion by air and may be operate in batch and continuous mode.

a. Mixer granulators
b. Tumbling granulators
c. Fluidized bed granulators
d. Granulator

A

c. Fluidized bed granulators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Fracture of a granule to form two or more
pieces.
a. Attrition
b. Shear
c. Impact
d. Fragmentation

A

d. Fragmentation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Operates in continuous mode and able to deal with large through-puts.

a. Mixer granulators
b. Tumbling granulators
c. Fluidized bed granulators
d. Granulator

A

b. Tumbling granulators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

It occurs when there is a long period during which no increase in size occurs.

a. Unsteady Growth
b. Inductor Growth
c. Increases Growth
d. Induction Growth

A

d. Induction Growth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

It results in larger particles than those formed in spray dryers.

a. Pug mills
b. Prilling
c. Extruder
d. Dryer

A

b. Prilling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The size distribution of particles in an agglomeration process; it is determined by the kinetics of the many processes occurring simultaneously.

a. Population balance
b. Layering
c. Flotation
d. Nucleation

A

a. Population balance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Generating nuclei that re-enter the cycle again.

a. Shear
b. Impact
c. Compression
d. Attrition

A

d. Attrition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Increase in particle size but not in total mass of particles

a. Nuclei
b. Coalescence
c. Perikinetic process
d. Layering

A

b. Coalescence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Particles are ‘tumbled’ in an open cylinder, roughened walls were subjected to a combination of gravitational and centrifugal forces.

a. Mixer granulator
b. Fluidized beds
c. Drum agglomerators
d. Tumbling granulators

A

c. Drum agglomerators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Particularly used with large particles, the rapid circulation within the bed gives rise to a high level of inter-particle impacts.

a. Fluidized beds
b. Extruders
c. Spouted beds
d. None of the Above

A

c. Spouted beds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

For solid particles, the propensity ________ with particle size because of the availability of a larger number of weaker microcracks. Hence, larger particles break more ________ than smaller particles.

a. increases ; gradually
b. decreases ; frequently
c. increases ; frequently
d. decreases ; gradually

A

c. increases ; frequently

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Briquetting machines are used to create briquettes of material by compacting smaller pieces together. The following are the advantages of using briquetting machines except?

a. Rollers can wear down quickly
b. Briquettes are easy to transport.
c. Briquette formation is predictable and consistent.
d. Low operating costs

A

a. Rollers can wear down quickly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Like breakage frequency, the average number of daughter particles is dependent on _____________.

a. Particle Shape
b. Mechanical Properties
c. Surface Properties
d. Particle Size

A

d. Particle Size

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

I: Pellet mills compact powder in a confined space via a process called pressure agglomeration.
II: The pressure is increased in the compression step, causing brittle particles to break and malleable particles to deform.

a. Both statements are True
b. Both statements are False
c. Only statement I is True
d. Only statement II is True

A

a. Both statements are True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

This is the size distribution of daughter particles resulting from breakage of particles of a particular size.

a. Average number of daughter particles
b. Daughter distribution function
c. Breakage Frequency
d. Aggregation Efficiency

A

b. Daughter distribution function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Disc granulators, or pelletizing discs as they are known in the ore industry, work based on the tumbling technique of agglomeration. ______, magnetic, and electrostatic forces bind the agglomerates together. The strongest force against agglomeration is the ______ of the solid.

a. Forces due to Liquid Bridges ; density
b. Van der Waals ; density
c. Forces due to Liquid Bridges ; weight
d. Van der Waals ; weight

A

d. Van der Waals ; weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Aggregation efficiency is a function of size of both the aggregating particles in the pair and is denoted by______.

a. p(x｜x′ )
b. a(x-xl)b
c. a(x, x′ )
d. p(x′- x│x′)

A

c. a(x, x′ )

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The powder is chopped and mixed to produce a fine, free-flowing powder. Then a liquid binder is blended with the powder to produce granules.

a. Disc Granulator
b. Mixer Granulator
c. Powder Blender
d. Rotating Drum

A

b. Mixer Granulator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The ________ is usually a function of particle size and is denoted by Γ(x). The Γ(x) provides the fraction of particles that will break per unit ____.

a. breakage frequency ; time
b. powder layering ; mass
c. powder layering ; time
d. breakage frequency ; mass

A

a. breakage frequency ; time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

In __________, molten input is picked up by a rotating drum and moves toward the outer surface of the drum.

a. Mixer Agglomeration
b. Pressure Agglomeration
c. Thermal Agglomeration
d. Spray Agglomeration

A

c. Thermal Agglomeration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

It is a process by which smaller particles are put together to form larger masses in which the original particles can still be identified

a. Size Reduction
b. Crystallization
c. Size Enlargement
d. None of the Above

A

c. Size Enlargement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Size enlargement is one of the single most important process steps involving ___________in the process industries.

a. Liquids
b. Particulate Solids
c. Solids
d. Particulate Liquids

A

b. Particulate Solids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Size enlargement is mainly associated with the

a. Pharmaceuticals
b. Food Industries
c. Agricultural
d. All of the above

A

d. All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Methods by which size enlargement is brought about include granulation, compaction (e.g. tabletting), extrusion, _______, spray drying and prilling.

a. Reduction
b. Enlargement
c. Slintering
d. Sintering

A

d. Sintering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
I: Agglomeration is the formation of agglomerates or aggregates by sticking together of larger particles and granulation is agglomeration by agitation methods II: There are many reasons why we may wish to increase the mean size of a product or intermediate a. Both Statements are true b. Only statement I is true c. Only statement II is true d. Both statements are false
c. Only statement II is true
26
These are specifically important to granulation processes a. Liquid Bridge Forces b. Mixer granulator c. Extruder d. Fluidised beds
a. Liquid Bridge Forces
27
The rate processes are important to granulation and _____________ included in order to develop a ________ model for simulation for the granulation process. a. Material Balance ; complex b. Population Balance ; simple c. Material Balance ; simple d. Population Balance ; complex
b. Population Balance ; simple
28
There exist between all solids molecularly based attractive forces collectively known as a. Forces due to Adsorbed Liquid Layers b. Liquid Bridges Forces c. van der Waals forces d. Electrostatic Forces
c. van der Waals forces
29
The energy of these forces is of the order of ____ eV and decreases with the _____ power of the distance between molecules. a. 0.01 ; 7th b. 0.1 ; 8th c. 0.1 ; 6th d. 0.01 ; 5th
c. 0.1 ; 6th
30
The attractive force, Fvw, between a sphere and a plane surface as a result of van der Waals forces was derived by ____________ a. Hamaker (1937) b. Hamaker (1947) c. Hamaker (1957) d. Hamaker (1977)
a. Hamaker (1937)
31
Granules formed by _________ are usually not the ______ product in a granulation process. a. Electrostatic Forces ; end b. Liquid Bridges ; end c. Granulation ; end d. Solid Bridges ; start
b. Liquid Bridges ; end
32
Solid bridges between particles may take three forms: a. Crystalline Bridges, Liquid Binder Bridges, and Solid Binder Bridges b. Crystalline Bridges, Solid Binder Bridges, and Solid Binder Bridges c. Crystalline Bridges, Liquid Binder Bridges, and Liquid Binder Bridges d. Crystalline Bridges, Solid Binder Bridges, and Liquid Binder Bridges
a. Crystalline Bridges, Liquid Binder Bridges, and Solid Binder Bridges
33
If the material of the particles is soluble in the liquid added to create granules, crystalline bridges may be formed ________________. a. When the liquid condensates b. When the liquid distillates c. When the liquid evaporates d. When the liquid crystallize
c. When the liquid evaporates
34
I: The process of evaporation reduces the proportion of liquid in the granules producing high strength pendular bridges after crystals form. II: The liquid used initially to form the granules may contain a binder or glue which takes effect upon evaporation of solute. a. Both statements are true b. Both Statements are false c. Only statement I is true d. Only statement II is true
b. Both Statements are false
35
This is a finely ground ______ which reacts with the ______ present to produce a solid _______ to hold the particles together. a. Liquid ; Solid ; Cement b. Solid ; Gas ; Concrete c. Solid ; Liquid ; Cement d. Particle ; Liquid ; Cement
c. Solid ; Liquid ; Cement
36
The relative importance of the forces varies with changes in _______ properties and with changes in the humidity of the surrounding _______. a. Particle ; Boundaries b. Solids ; Environment c. Liquids ; Atmosphere d. Particle ; Atmosphere
d. Particle ; Atmosphere
37
There is considerable interaction between the _____________ a. Bonding Forces b. Solid Forces c. Binding Forces d. Agglomerating Forces
a. Bonding Forces
38
In aqueous systems adsorbed moisture can considerably increase ___________. a. Solid Bridge Forces b. Van der Waals Forces c. Electrostatic Forces d. Liquid Bridges Forces
b. Van der Waals Forces
39
I: Absorbed moisture can also reduce interparticle friction and potential for interlocking, making the powder more free-flowing. II: Liquid Bridges Forces decay rapidly if the humidity of the surrounding air is increased. a. Both Statements are true b. Both statements are false c. Only statement I is false d. Only statement II is false
b. Both statements are false
40
If humidity is further increased liquid bridge formation can result in a return to cohesive behaviour. This effect has been reported in powder mixing studies by _________ a. Coelo and Hamby (1978) and Kara and Fuerstenau (1977) b. Coelho and Harnby (1948) and Karra and Fuerstenau (1957) c. Coelho and Harnby (1978) and Karra and Fuerstenau (1977) d. Coellho and Harnby (1978) and Karra and Fuerstenaau (1977).
c. Coelho and Harnby (1978) and Karra and Fuerstenau (1977)
41
When the granules are very weak (Stdef > 0.2), they fall apart due to collisions and no granule growth occurs. This is the _______. a. Nucleation Regime b. Crumb Regime c. Slurry Regime d. Deform Regime
b. Crumb Regime
42
All collisions between wet granules will lead to coalescence and the rate of growth will be high. Stv < Stv*. a. Non-inertial Regime b. Inertial Regime c. Coating Regime d. Collision Regime
a. Non-inertial Regime
43
No collisions lead to coalescence. Granules grow very slowly by layering only. Stv > Stv*. a. Non-Inertial Regime b. Inertial Regime c. Coating Regime d. Collision Regime
c. Coating Regime
44
Some collisions will lead to coalescence. The rate of granule growth will be moderate and sensitive to formulation or process parameters that change Stv. Stv ≈ Stv*. a. Non-Inertial Regime b. Inertial Regime c. Coating Regime d. Collision Regime
b. Inertial Regime
45
When two granules collide within the granulator, what will the collision lead to if Stv > Stv*. a. Breakage b. Consolidation c. Coalescence d. Rebound
d. Rebound
46
If the viscous Stoke number of two colliding granules is Stv < Stv* , what will happen? a. Breakage b. Consolidation c. Coalescence d. Rebound
c. Coalescence
47
In this growth behavior, granules quickly reach a minimum porosity and there is lots of deformation on collision. a. Steady Growth b. Unsteady Growth c. Induction Growth d. Rapid Growth
a. Steady Growth
48
Where granules grow in size very quickly and any induction time is reduced to zero, this growth behavior occurs at very high liquid saturations. a. Steady Growth b. Unsteady Growth c. Induction Growth d. Rapid Growth
d. Rapid Growth
49
A simulation process used by engineers that is the suitable approach for wet agglomeration processes when more mathematics or precision are required a. Finite Element Analysis b. Overall Mass Balance c. Population Balance Modeling d. Solute Component Balance
c. Population Balance Modeling
50
A simulation process that is suitable for the compaction process because it uses a numerical method useful for computing stresses in solids under load and deformation. a. Finite Element Analysis b. Overall Mass Balance c. Population Balance Modeling d. Solute Component Balance
a. Finite Element Analysis
51
The primary potential driving forces for sintering includes; (except) a. The curvature of the particle surfaces b. An externally applied pressure c. A dense Solid d. A chemical reaction
c. A dense Solid
52
Low vacancy concentration; Concave Surface, High vacancy concentration; Convex Surface a. Both statements are true b. Both Statements are false c. Only statement I is true d. Only statement II is true
b. Both Statements are false
53
In polycrystalline materials, the mass transport ways that are responsible for sintering are; (except) a. diffusion via crystal lattice b. surface diffusion c. volume diffusion d. plastic diffusion
d. plastic diffusion
54
Layering is the dominant growth mechanism in the coating regime and is therefore most important for beds of large granules and low binder viscosity e.g. ammonium nitrate granulation, urea prill fattening and coating applications. Consolidation has a strong effect on the final porosity of granules produced by coalescence. a. Both statements are true b. Both Statements are false c. Only statement I is true d. Only statement II is true
a. Both statements are true
55
Low density, high velocity spout through which most of the air travels; and a low density, moving bed annular region through which air percolates at a low velocity. a. Both statements are true b. Both Statements are false c. Only statement I is true d. Only statement II is true
c. Only statement I is true
56
Mixer granulators find wide application for: a. Pharmaceuticals b. Clays and Ceramics c. Agricultural Chemicals d. Construction
d. Construction
57
Four major classes of particulate caking: (Except) a. Mechanical Caking b. Physical Caking c. Chemical Caking d. Plastic-Flow Caking
b. Physical Caking
58
Green agglomerates are formed from solid particles and binder. Green agglomerates are not cured a. Both statements are true b. Both Statements are false c. Only statement I is true d. Only statement II is true
c. Only statement I is true
59
The mode of operation to achieve and control agglomeration is characterized by several consecutive steps; (except) a. Cutting b. Mixing c. Spraying of binder and agglomeration d. Filling
a. Cutting
60
Spray drying represents an attractive alternative to traditional granulation and feed preparation methods used. Atomization of the liquid feed and contacting the spray with air are the critical features of spray dryers a. Both statements are true b. Both Statements are false c. Only statement I is true d. Only statement II is true
a. Both statements are true

PARTECH (quiz 2) (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions