Say if the following statements are true or false. If the statement is false

and explain why:

1) A grinding mill crushes material between two closely placed, heavy objects like stones.
2) Dry chemicals can be ground to a dissimilar particle size.
3) A grinding machine can produce powder from various flammable and non-explosive mineral materials.
4) Cinder isn’t used for producing powder by grinding.
5) A ball mill grinds material to the necessary fineness by friction and impact with the tumbling balls.
6) Flint pebbles, stainless steel balls and ceramic can’t be used as grinding media in an industrial grinder.
7) The preliminary stage of crushing and the final stage of grinding are economically combined into one operation.
8) Impact crushers involve the use of impact rather than pressure to crush material.

6. Сhoose the correct item to complete the following statements:

1. In materials processing a grinder is a machine for producing fine particle size reduction through ______

a) compression

b) attrition

c) friction

2. In industrial and manufacturing process there are different types of industrial grinders used for breaking down and mixing rough material like_____

a) paints

b) gravel

c) rocks

3. Ball mill rotates on a horizontal axis and has a cylindrical______

a) design

b) casing

c) form

4. The final stage of crushing and the preliminary stage of grinding are economically combined into one______

a) unit

b) action

c) operation

5. Impact crushers offer the lowest capital______

a) price

b) cost

c) expense

6. Impact crushers can be adapted for wet crushing and grinding to produce ______

a) liquor

b) solution

c) slurry

5. Match the words to make up possible word combinations and translate them into Ukrainian:

1) solid	a) size	1)
2) cylindrical	b) mills	2)
3) coking	c) clay	3)
4) porcelain	d) forces	4)
5) specified	e) chemicals	5)
6) ball	f) chambers	6)
7) dry	g) fineness	7)
8) grain	h) coal	8)
9) compressive	i) design
10) crushing	j) matters

6. Fill in the gaps using a suitable word from the table:

a) powder b) material c) machine d) diameter e) pressure f) media g) screens h) crushing

1. In materials processing a grinder is a______ for producing fine particle size reduction.

2. A grinding mill crushes______ between two closely placed, heavy objects like stones.

3. Grinding machines are mainly applied for the______ processing of mineral products.

4. Ball mills are characterized by their smaller______ and longer length.

5. Impact crushers can be used to combine _______and grinding, in one operation.

6. Impact crushers involve the use of impact rather than______ to crush material.

7. Stainless steel balls and ceramic can be used as grinding ______in an industrial grinder.

8. With different forms of crushing chambers and discharge______, impact crushers can handle and reduce almost any material that is not too abrasive.

7. Find out the sentences containing gerundial constructions and define the function of Gerund:

1. A grinder is a machine for producing fine particle size reduction.

2. A grinding mill crushes material between two closely placed, heavy objects.

3. Mechanical forces trench the structure by overcoming of the interior bonding forces.

4. Different types of industrial grinders used for breaking down and mixing rough material.

5, A rotating cylinder is partially filled with balls, usually stone or metal.

In industrial and manufacturing process there are different types of industrial grinders.

6. Cascading effect decreases the material to a very fine and give it powder shape.

7. Impact crushers can be adapted for wet crushing to produce a slurry.

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<== попередня сторінка	\|	наступна сторінка ==>
Grinders	\|	Make a brief engineering report explaining the difference between a ball mill and an impact crusher. Mention the design, the principle of work and materials to be processed.

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