Chemical Engineering - Refractory Technology
Exercise :: Refractory Technology - Section 2
| 1. |
The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent. |
| A. |
fireclay | | B. |
silica | | C. |
magnesite | | D. |
corundum |
Answer: Option A
Explanation:
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| 2. |
Fusion point of an acidic refractory material is |
| A. |
increased by the addition of basic oxides. | | B. |
reduced by the addition of basic oxides. | | C. |
not affected by the addition of basic oxides. | | D. |
always more than 2500°C. |
Answer: Option B
Explanation:
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| 3. |
Which is required in an insulating refractory ? |
| A. |
High thermal conductivity | | B. |
Low porosity | | C. |
Both (a) and (b) | | D. |
Neither (a) nor (b) |
Answer: Option D
Explanation:
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| 4. |
'Super refractories' are made from pure |
| A. |
carbides | | B. |
oxides | | C. |
borides | | D. |
nitrides |
Answer: Option B
Explanation:
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| 5. |
Chromite refractories are |
| A. |
acidic refractory. | | B. |
neutral refractory. | | C. |
basic refractory. | | D. |
fired at a temperature of 600°C only. |
Answer: Option B
Explanation:
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