4. Answer the questions to the text:

1) What is a grinding mill designed for?

2) How does a grinding mill work?

3) What purposes in engineering may grinding serve?

4) What mineral materials are used for producing powder by a grinding machine?

5) What is the most commonly used industrial grinder

6) How does a ball mill operate?

7) What machines are used to combine crushing and grinding in one operation?

8) What materials are impact crushers designed to handle and reduce?

5. 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.