Engineering Materials

31. Blast furnace produces following by reduction of iron ore

1. cast iron
2. pig iron
3. wrought iron
4. malleable iron
5. white iron.

View answer

32. Brass (alloy of copper and zinc) is an example of

1. substitutional solid solution
2. interstitial solid solution
3. intermetallic compounds
4. all of the above
5. none of the above.

View answer

33. Brass contains

1. 70% copper and 30% zinc
2. 90% copper and 10% tin
3. 85-92% copper and rest tin with little lead and nickel
4. 70-75% copper and rest tin
5. 70% copper and 30% tin.

View answer

34. Bronze contains

1. 70% copper and 30% zinc
2. 90% copper and 10% tin
3. 85-92% copper and rest tin with little lead and nickel
4. 70-75% copper and rest tin
5. 90% copper and 10% zinc.

View answer

35. By severely deforming a metal in a particular direction it becomes

1. ductile
2. malleable
3. homogeneous
4. isotropic
5. anisotropic.

View answer

36. Carbon in iron is an example of

1. substitutional solution
2. interstitial solid solution
3. intermetallic compounds
4. all of the above
5. none of the above.

View answer

37. Carbon steel is

1. made by adding carbon in steel
2. refined from cast iron
3. an alloy of iron and carbon with varying quantities of phosphorus and sulphur
4. extensively used for making cutting tools
5. extremely brittle.

View answer

38. Cast iron has

1. high tensile strength
2. its elastic limit close to the ultimate breaking strength
3. high ductility
4. all of the above
5. none of the above.

View answer

39. Cast iron is characterised by minimum of following %age of carbon

1. 0.2%
2. 0.8%
3. 1.3%
4. 2%
5. 6.3%.

View answer

40. Cemented carbide tools are not found to be suitable for cutting

1. brass
2. cast iron
3. aluminium
4. steel
5. non-ferrous alloys.

View answer