Е. С. Закирова, П. А. Красавин Английский язык для технических вузов

Exercise 22. Make up general and disjunctive questions and answer them ac-

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• Exercise 23. Make up special questions according to the models and answer them to streamline your speaking skills. Model A

Exercise 22. Make up general and disjunctive questions and answer them ac- cording to the models to enhance your speaking skills. Model A:  Each of metalworking categories contains various processes.   Does each of metalworking categories contain various processes? —  Yes, it does.   Each of metalworking categories contains various processes, doesn’t  it? — Yes, it does. 1. A mold contains a hollow cavity. 2. A sand casting process uses sand as  the mold material. 3. Forging improves the mechanical properties of metals.  4. Forging minimizes the internal grain size. 5. The metal fills the die cavity. Model B: Most forging operations use metal dies.   Do most forging operations use metal dies? — Yes, they do.   Most forging operations use metal dies, don’t they? — Yes, they do. 1. Dies withstand the tremendous forces and pressure. 2. Forgings require  their considerable machining on completing open die forging process. 3. The  disadvantages of closed die forging include additional cost and the need for  lubrication and workpiece placement. 4. These forming processes involve the  application of mechanical force at room temperature. 5. Some recent develop- ments involve the heating of dies. Exercise 23. Make up special questions according to the models and answer  them to streamline your speaking skills. Model A: Modern metalworking processes are forming, cutting and joining.   What are modern metalworking processes? 1. The main forging operations are drawing out, upsetting, squeezing in  compression dies. 2. The main workpieces and machine parts manufacturing  processes are open die forging, impression die forging, closed die forging, sheet  metal forming. 3. Final metallurgy processes are rolling, extrusion and draw- ing. 4. The main sheet metal forming processes are stamping, punching and  bending. 5. The main kinds of casting are sand casting, shell-mold casting, die  casting, and spin casting. Model B:  Heated liquid material is usually poured into a mold.   What is usually poured into a mold? 1. A casting is ejected or broken out of the mold. 2. A sand casting is  characterized by using sand as the mold material. 3. A metal workpiece  151 is placed in a die. 4. A die is attached to the anvil. 5. A hammer is dropped  on the workpiece. жүктеу/скачать 4,38 Mb. Достарыңызбен бөлісу: