FM 425 FINAL EXAM | 141 QUESTIONS | WITH COMPLETE
SOLUTIONS/NEWEST UPDATE
!@#$%%%%%
What are the benefits of grinding in feed manufacturing? - (ANSWERS)-Increase and improve
feed digestion %%%%%%
-Improve mixing efficiency
-Improves pellet durability and quality
-Increases homogeneity and prevents separation
What are some reasons for grinding? - (ANSWERS)-Animal characteristics and needs
-Feeding situation
-Feed form and ingredients
-Personnel (Vet, nutritionist)
What are the two main components of hammermills? - (ANSWERS)The feeder and the grinding
chamber
What are the two types of feeders? - (ANSWERS)Rotary feeder and variable screw feeder
What are the components of the grinding chamber? - (ANSWERS)-Inlet
-Disc plate
-Hammers
-Screens
As screen hole size increases, particle size...? - (ANSWERS)Particle size increases
What is tip speed? - (ANSWERS)The hammers speed, higher speed gives finer particles.
Tip speed is calculated using v=2πr X RPM
What are the advantages and disadvantages of a hammermill? - (ANSWERS)Advantages: wide
particle size range, minimal maintenance expense
Disadvantages: Higher energy consumption for larger particles, noise generation
In a roller mill, what is a roll gap? - (ANSWERS)Determines the distance between rolls and can
be adjusted to optimize particle size
Advantages of roller mill - (ANSWERS)-Low energy consumption
-Reduced noise
-Minimal heat generation
Disadvantages of a roller mill - (ANSWERS)-High intial investment costs
-Complicated operational requirements
-Limits in grinding fiberous material
, FM 425 FINAL EXAM | 141 QUESTIONS | WITH COMPLETE
SOLUTIONS/NEWEST UPDATE
!@#$%%%%%
When do we use the Pre-Grind System? - (ANSWERS)Suitable when delaing with 1 or 2 primary
ingredients %%%%%%
When do we use the Post-Grind System? - (ANSWERS)Suitable when handling multiple
ingredients. Large grinders are required.
What is the Re-Grind System? - (ANSWERS)Adds another grinding step post-mixing. Good for
aquaculture.
What is the Step-Grinding System? - (ANSWERS)Two-stage grinding, roller mill then
hammermill
What is Geometric Mean Diameter (DGW) in terms of particle size? - (ANSWERS)Represents
the size at which half the sample's weight is composed of larger particles and the other half of
smaller particles
What is Geometric Standard Deviation (SGW) in terms of particle size? - (ANSWERS)Indicates
width of distribution. Higher SGW suggests a wider distribution and vice versa.
DGW x SGW= - (ANSWERS)+1 Standard deviation
DGW / SGW= - (ANSWERS)-1 Standard deviation
What are the components of the sieving method? - (ANSWERS)-Sieve agitators
-Dispersion agents
-Sieve shakers
What are process scales? - (ANSWERS)Operate on load cells, integrated into automated
systems for efficiency
What are microsystems? - (ANSWERS)Used for measuring mino ingredients, employs both
single and multiple weigh hoppers or loss-in-weight systems
What are tote systems? - (ANSWERS)Ideal for ingredients that do not require large scale storage
but are not suitable for micro bins.
What is the batching sequence? - (ANSWERS)Major ingredients are added, then minor
ingredients, then micro ingredients
What are factors that affect mixing? - (ANSWERS)-Particle size and shape
-Density
-Electrostatic charge
SOLUTIONS/NEWEST UPDATE
!@#$%%%%%
What are the benefits of grinding in feed manufacturing? - (ANSWERS)-Increase and improve
feed digestion %%%%%%
-Improve mixing efficiency
-Improves pellet durability and quality
-Increases homogeneity and prevents separation
What are some reasons for grinding? - (ANSWERS)-Animal characteristics and needs
-Feeding situation
-Feed form and ingredients
-Personnel (Vet, nutritionist)
What are the two main components of hammermills? - (ANSWERS)The feeder and the grinding
chamber
What are the two types of feeders? - (ANSWERS)Rotary feeder and variable screw feeder
What are the components of the grinding chamber? - (ANSWERS)-Inlet
-Disc plate
-Hammers
-Screens
As screen hole size increases, particle size...? - (ANSWERS)Particle size increases
What is tip speed? - (ANSWERS)The hammers speed, higher speed gives finer particles.
Tip speed is calculated using v=2πr X RPM
What are the advantages and disadvantages of a hammermill? - (ANSWERS)Advantages: wide
particle size range, minimal maintenance expense
Disadvantages: Higher energy consumption for larger particles, noise generation
In a roller mill, what is a roll gap? - (ANSWERS)Determines the distance between rolls and can
be adjusted to optimize particle size
Advantages of roller mill - (ANSWERS)-Low energy consumption
-Reduced noise
-Minimal heat generation
Disadvantages of a roller mill - (ANSWERS)-High intial investment costs
-Complicated operational requirements
-Limits in grinding fiberous material
, FM 425 FINAL EXAM | 141 QUESTIONS | WITH COMPLETE
SOLUTIONS/NEWEST UPDATE
!@#$%%%%%
When do we use the Pre-Grind System? - (ANSWERS)Suitable when delaing with 1 or 2 primary
ingredients %%%%%%
When do we use the Post-Grind System? - (ANSWERS)Suitable when handling multiple
ingredients. Large grinders are required.
What is the Re-Grind System? - (ANSWERS)Adds another grinding step post-mixing. Good for
aquaculture.
What is the Step-Grinding System? - (ANSWERS)Two-stage grinding, roller mill then
hammermill
What is Geometric Mean Diameter (DGW) in terms of particle size? - (ANSWERS)Represents
the size at which half the sample's weight is composed of larger particles and the other half of
smaller particles
What is Geometric Standard Deviation (SGW) in terms of particle size? - (ANSWERS)Indicates
width of distribution. Higher SGW suggests a wider distribution and vice versa.
DGW x SGW= - (ANSWERS)+1 Standard deviation
DGW / SGW= - (ANSWERS)-1 Standard deviation
What are the components of the sieving method? - (ANSWERS)-Sieve agitators
-Dispersion agents
-Sieve shakers
What are process scales? - (ANSWERS)Operate on load cells, integrated into automated
systems for efficiency
What are microsystems? - (ANSWERS)Used for measuring mino ingredients, employs both
single and multiple weigh hoppers or loss-in-weight systems
What are tote systems? - (ANSWERS)Ideal for ingredients that do not require large scale storage
but are not suitable for micro bins.
What is the batching sequence? - (ANSWERS)Major ingredients are added, then minor
ingredients, then micro ingredients
What are factors that affect mixing? - (ANSWERS)-Particle size and shape
-Density
-Electrostatic charge
