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Test

I. Choose the right answer.

1. … are important in industry because they can be easily deformed into useful shapes.

a) grains b) metals

c) tubes d) billet

2. In back-extrusion the … is placed in the bottom of a hole and a loosely fitting ram is pushed against it.

a) orifice b) imprint

c) workpiece d) rolling

3. … is the shaping of a piece of metal by pushing with open or closed dies.

a) drawing b) forging

c) rolling d) welding

4. Open-die forging is usually done by … a part between two flat faces.

a) hammering b) sheet metal forming

c) drawing d) rolling

5. Nowadays … is used instead of bolting and riveting in the construction of many structures, including bridges, buildings and ships.

a) sheet metal forming b) rolling

c) welding d) hammering

6. Gas welding has the advantage of using … that is portable and does not require an electric power source.

a) current b) pressure

c) equipment d) wire

7. The heat from the arc formed between the … and the metal melts the edges of the metal.

a) liquid b) carbon

c) filler d) electrode

8. Metal for the weld may be added by placing a bare … in the arc or the point of the weld.

a) wire b) electrode

c) carbon d) current

9. A small portion of material is removed at each pass of the … .

a) screw b) cutter

c) wheel d) thread

10. Other machining methods include … using ultrasound and cutting by mean of laser beam.

a) rolling b) drilling

c) welding c) drawing

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