Week 3

Question 1

Mode of reduction

Answer 1

Cutting
Compression (crushed)
Shear
Impact (strikes against hammer)
Attrition (rubbing action)

Question 2

Types of force in mode of reduction

Answer 2

Compressive: used for coarse crushing of hard materials
Impact: used to mill a wide variety of materials
Shear: applied for soft materials

Question 3

Characteristics of roller mills

Answer 3

For wheat milling
Compressive force

Question 4

Types of roller mills

Answer 4

Two roller mills
Four roller mills
Five and six roller mills

Question 5

Types of equipment with each force

Answer 5

compressive force: grinder mill, ball mill, crushers
impact force: hammer mill, cutter mill
shear force: disc mill, shredder, chopper

Question 6

Factors that influence the energy input

Answer 6

Moisture content of the food
Heat sensitivity of the food