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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