Select the correct answer(s) 1. Mild steel belongs to the following category (a) low carbon steel....

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Select the correct answer(s) 1. Mild steel belongs to the following category (a) low carbon steel. (b) medium carbon steel. (d) alloy steel. (e) special steel. 2. Recrystallization temperature is one (a) at which crystals first start forming from molten metal when it is cooled. (b) at which new spherical crystals first begin to form from the old deformed one when as trained metal is heated. (c) at which change of allotropic form takes place. (d) at which crystals grow bigger in size. (e) at which crystals are destroyed on heating. 3. Which of the following constituents of steels is softest and least strong? (a) austenite. (b) pearlite. (c) ferrite. (d) cementlte. (e) bainite. 4. The following types of materials are usually the most ductile (a) face-centred cubic lattice. (c) high carbon steel. (b) body-centred cubic lattice. (c) hexagonal close-packed lattice. (d) all of the above. (e) none of the above. 5. The unique property of cast iron is its high (a) malleability. (b) ductility. (c) surface finish. (d) damping characteristics. (e) hardness. 6. Pick up the wrong statement: Nickel and chromium in steel help in (a) providing corrosion resistance. (b) improving machining properties. (c) providing high strength at elevated temperatures. (d) raising the elastic limit. (e) improving the resilience and ductility. 7. Machining properties of steel are improved by adding (a) sulphur, lead, phosphorous. (c) vanadium, aluminium. (d) chromium, nickel. (b) silicon, aluminium, titanium. 8. Solder is an alloy consisting of (a) tin, antimony, copper. (d) lead and zinc. (e) lead and copper. 2 (b) tin and copper. (e) lubricants. (c) tin and lead. Select the correct answer(s) 1. Mild steel belongs to the following category (a) low carbon steel. (b) medium carbon steel. (d) alloy steel. (e) special steel. 2. Recrystallization temperature is one (a) at which crystals first start forming from molten metal when it is cooled. (b) at which new spherical crystals first begin to form from the old deformed one when as trained metal is heated. (c) at which change of allotropic form takes place. (d) at which crystals grow bigger in size. (e) at which crystals are destroyed on heating. 3. Which of the following constituents of steels is softest and least strong? (a) austenite. (b) pearlite. (c) ferrite. (d) cementlte. (e) bainite. 4. The following types of materials are usually the most ductile (a) face-centred cubic lattice. (c) high carbon steel. (b) body-centred cubic lattice. (c) hexagonal close-packed lattice. (d) all of the above. (e) none of the above. 5. The unique property of cast iron is its high (a) malleability. (b) ductility. (c) surface finish. (d) damping characteristics. (e) hardness. 6. Pick up the wrong statement: Nickel and chromium in steel help in (a) providing corrosion resistance. (b) improving machining properties. (c) providing high strength at elevated temperatures. (d) raising the elastic limit. (e) improving the resilience and ductility. 7. Machining properties of steel are improved by adding (a) sulphur, lead, phosphorous. (c) vanadium, aluminium. (d) chromium, nickel. (b) silicon, aluminium, titanium. 8. Solder is an alloy consisting of (a) tin, antimony, copper. (d) lead and zinc. (e) lead and copper. 2 (b) tin and copper. (e) lubricants. (c) tin and lead.

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1 The correct answer is a Low carbon steel A ferrous metal consisting of iron and carbon is known as mild steel It is a cheap material with qualities that make it appropriate for the majority of gener... View the full answer