IX. Find the proper function to the following handling equipment mechanisms.

1. A jack a) are used for auxiliary construction purposes

2. Hydraulic jacks b) is used for assembling machines

3. Hand-operated winches c) is used for raising a load to a small height

4. A hoist d) are used to lift heavy equipment

X. Complete the sentences using variants (a), (b) or (c).

1. A jack is the simplest load lifting appliance for

a) … raising heavy equipment

b) … assembling machines

c) … raising a load to a small height

2. Rack-and-pinion jacks can handle

1. … from 3 to 500 tons

2. … from 0.5 to 10 tons

3. … from 1 to 20 tons

3. A hoist is a simple suspension-type small-size mechanism used for

1. … lifting 0.25 to 10 tons

2. … raising structures weighing thousands of tons

3. … assembling machines

4. To raise structures weighing thousands of tons

1. … two jacks are jointed together

2. … several jacks are used

3. … one jack is used

5.The winch is driven by an electric motor through

a) gear box

b) a V-belt drive

c) a V-belt drive and a pair of gear wheels

Fig. 1. Jacks: a) rack-and-pinion, b) hydraulic

Fig.2.

Fig. 3.

XI. Replace the underlined words by their synonyms given below.

Liquid, some, powered, lift, basically, used, work, lifting.

1. A jack is used for raising a load to a small height.

2. A rack-and pinion jack is more dangerous in operation than a screw jack.

3. Hydraulic jacks are employed to erect heavy equipment.

4. Piston rises when liquid is forced into the cylinder.

5. Several jacks are jointed together to raise heavy structures.

6. The winch is driven by an electric motor through a V-belt drive and a pair of gear wheels.

7. Hoists are mainly used for assembling machines.

XII. Make up sentences according to the scheme:

It is interesting to note that a… b

A B

1.The support of a rack-and-pinion a) while hand-operated hoists can

jack lift from 0.25 to 10 tons

2. Rack-and-pinion jacks have no b) can be placed under a lower

brakes lying load

3. Hand-operated winches used for c) so they are more dangerous in

Auxiliary construction purposes operation

4. Electric hoists handle from 0.125 d) develop a pull of up to 10 tons

to 10 tons

XIII. Make up questions according to the models using the words given below:

Models: 1. What types of jacks are there?

winches

hoists

cranes

tractors