Chemical Engineering - Refractory Technology
Exercise :: Refractory Technology - Section 3
| 41. |
Addition of zircon to silica refractory brick improves its |
| A. |
crushing strength | | B. |
resistance to slag attack | | C. |
both (a) and (b) | | D. |
neither (a) nor (b) |
Answer: Option B
Explanation:
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| 42. |
Which is a neutral refractory ? |
| A. |
Graphite | | B. |
Magnesite chrome | | C. |
Silica | | D. |
Magnesia |
Answer: Option A
Explanation:
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| 43. |
Permeability of bricks is a measure of the |
| A. |
refractoriness. | | B. |
melting point. | | C. |
rate at which a fluid will pass through the pores. | | D. |
expansion during heating. |
Answer: Option C
Explanation:
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| 44. |
With increase in the density of silica refractories, its |
| A. |
resistance to slag attack increases. | | B. |
spalling resistance reduces. | | C. |
both (a) and (b). | | D. |
neither (a) nor (b). |
Answer: Option C
Explanation:
|
| 45. |
Magnesite chrome refractories |
| A. |
have better spalling resistance than chrome magnesite refractories. | | B. |
have very low thermal co-efficient of expansion. | | C. |
are not at all resistant to the corrosive action of iron oxide. | | D. |
have very low (50 kg/cm2 ) cold crushing strength (C.C.S.), and can not be used in metalcase form. |
Answer: Option A
Explanation:
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