| 1. | Epoxy resin is a polymer containing two or more following groups called epoxide group or ethoxyline group. It is a
 |
| a. | polyamide & an elastomer. |
| b. | good adhesive. |
| c. | surface coating agent. |
| d. | both (b) and (c). |
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Answer: (d).both (b) and (c).
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| 2. | Epoxy resins (i.e., epoxide polymers)
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (b).B
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| 3. | Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its |
| a. | non-wetting characteristic. |
| b. | high thermal conductivity. |
| c. | high crushing strength. |
| d. | none of these. |
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Answer: (a).non-wetting characteristic.
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| 4. | Firing temperature of magnesite bricks is about __________ °C. |
| a. | 800-1000 |
| b. | 1000-1200 |
| c. | 1600-1800 |
| d. | 2400-2600 |
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Answer: (c).1600-1800
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| 5. | Hollow refractory bricks are made by |
| a. | slip casting |
| b. | hand moulding |
| c. | pressing/machine moulding |
| d. | extrusion |
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Answer: (a).slip casting
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