Engineering Materials

31. 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.

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32. 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.

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33. 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.

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

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

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35. 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.

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36. 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.

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37. 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.

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38. 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%.

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

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

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40. Chilled cast iron has

1. no graphite
2. a very high percentage of graphite
3. a low percentage of graphite
4. graphite as its basic constituent of composition
5. none of the above is true.

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