Chemical Engineering - Refractory Technology
Exercise :: Refractory Technology - Section 3
| 26. |
Which is an acidic refractory ? |
| A. |
Magnesite | | B. |
Dolomite | | C. |
Fireclay | | D. |
Chrome magnesite |
Answer: Option C
Explanation:
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| 27. |
Carborundum used for making crucibles for melting non-ferrous metals is chemically |
| A. |
silicon carbide | | B. |
silicon nitride | | C. |
crystalline magnesia | | D. |
zirconium sulphate |
Answer: Option A
Explanation:
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| 28. |
Which of the following impurities reduces the refractoriness of magnesite bricks ? |
| A. |
Al2O3 | | B. |
CaO | | C. |
SiO2 | | D. |
all (a), (b) & (c) |
Answer: Option D
Explanation:
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| 29. |
Crushing strength of a refractory |
| A. |
increases with rise in service temperature. | | B. |
decreases with rise in service temperature. | | C. |
is unaffected with change in service temperature. | | D. |
decreases with increase in porosity. |
Answer: Option B
Explanation:
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| 30. |
Ramming masses are used for |
| A. |
obtaining monolithic working faces. | | B. |
repairing construction of various furnace parts. | | C. |
both (a) & (b). | | D. |
neither (a) nor (b). |
Answer: Option C
Explanation:
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