Engineering Materials

21. An important property of malleable cast iron in comparison to grey cast iron is the high

1. compressive strength
2. ductility
3. carbon content
4. hardness
5. surface finish.

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22. Annealing of white cast iron results in production of

1. malleable iron
2. nodular iron
3. spheroidal iron
4. grey iron
5. none of the above.

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23. Argentite is the principal ore or raw material for

1. aluminium
2. tin
3. zinc
4. lead
5. silver.

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24. Austenite rs a combination of

1. ferrite and cementite
2. cementite and gamma iron
3. ferrite and austenite
4. ferrite and iron graphite
5. pearlite and ferrite.

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25. Babbit metal is a

1. lead base alloy
2. tin base alloy
3. copper base alloy
4. all of the above
5. (a) and (c) above.

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26. Balls for ball bearings are made of

1. cast iron
2. mild steel
3. stainless steel
4. carbon-chrome steel
5. high carbon steel.

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27. Basic constituents of Monel metal are

1. nickel, copper
2. nickel, molybdenum
3. zinc, tin, lead
4. nickel, lead and tin
5. none of the above.

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28. Basic solution is one which has pH value

1. greater than 7
2. equal to 7
3. less than 7
4. pH value has nothing to do with basic solution
5. none of the above.

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29. Bell metal 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. 70-75% copper and rest zinc and tin.

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30. Blast furnace produces following by reduction of iron ore

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

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