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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