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ÿþI. Complete the blanks with the following words: toughness, concrete, tempering, pure, steel, potential, length, corrosion- resistant, friction, ore. 1. ---------- is measured in meters. 2. Plastics are lighter and more ---------- than metals, but are not usually as strong. 3. Engineers reduce --------- by using very highly polished materials and by lubricating their surfaces with oil and grease. 4. ---------- is a kind of heat treatment. 5. Aluminium bronze is an example of ----------. 6. ---------- is a cheap building material. 7. Concorde is built mainly of ----------. 8. We rarely find ---------- materials in nature. 9. Iron is easy to extract from iron ----------. 10. Alloying is an important method of acquiring whatever special properties are required; strength, ---------- , resistance to wear, magnetic properties, high electrical resistance or corrosion- resistance. 11. Energy depending mainly on the position of an object is called ---------- energy. II. Match: 1) ferrous a) nonmetallic impurities present in the cast ingot 2) primary process b) internal casting defect caused by the presence of hydrogen gas defects dissolved in the metal at high temperature and forced out at the grain boundaries as the metal cools 3) use defects c) caused by conditions which occur during the use of the metal 4) reduction d) removing chemically combined oxygen 5) inclusions e) surface defects caused by brief interruptions in the hot metal flow 6) fatigue f) gas inclusions or empty voids in the ingot rolled in to flat thin defects 7) laminations g) refers to iron 8) porosity h) occur in the early formation of the metal 9) inherent defects i) cracks occurring on the metal surface where work loads are highest 10) cold shuts j) are present in the material before fabrication takes place Key: Excercise I. 1. length 5. alloy 9. ore 2. corrosion- resistant 6. concrete 10. toughness 3. friction 7. steel 11. potential 4. tempering 8. pure Excercise II. 1 g 2 h 3 c 4 d 5 a 6 i 7 f 8 b 9 j 10 e

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