Civil Engineering - Building Materials
Exercise :: Building Materials - Section 2
41. |
The slag which floats on the surface of the molten iron generally contains |
A. |
Lime (CaO) 45% | B. |
Silica (SiO2) 35% | C. |
Alumina (Al2O3) 12% | D. |
MgO, CaSO4, KMnO2 and FeO 8% | E. |
all the above. |
Answer: Option E
Explanation:
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42. |
Minimum of 40% of iron, is available in |
A. |
Magnetite | B. |
Red haemetite | C. |
Limonite | D. |
Siderite | E. |
Black band. |
Answer: Option E
Explanation:
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43. |
If the iron ore contains clay as an impurity, the flux added during calcination, is |
A. |
clay | B. |
lime stone | C. |
argillaceous iron ore | D. |
all the above. |
Answer: Option B
Explanation:
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44. |
Cement is said to be of good quality if |
A. |
its colour is not greenish grey | B. |
one feels cool by thrusting one's hand in the cement bag | C. |
it is not smooth when rubbed in between fingers | D. |
a handful of cement thrown into a bucket of water does not float | E. |
none of these. |
Answer: Option E
Explanation:
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45. |
Cast steel is manufactured by |
A. |
Cementation process | B. |
Crucible process | C. |
Bessemer process | D. |
Open hearth process. |
Answer: Option B
Explanation:
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