| 1. | Which of the following is the most suitable for preheating combustion air above 650°C ? |
| a. | Regenerator |
| b. | Metallic recuperator |
| c. | Ceramic recuperator |
| d. | None of these |
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Answer: (c).Ceramic recuperator
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| 2. | Soaking pits are meant for heating steel |
| a. | ingots |
| b. | coils |
| c. | sheets |
| d. | slabs |
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Answer: (a).ingots
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| 3. | The purpose of controlling the furnace atmosphere is to prevent surface attack by |
| a. | oxidation/scaling |
| b. | decarburising |
| c. | sulphur penetration |
| d. | either of the above |
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Answer: (d).either of the above
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| 4. | Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. |
| a. | 20 |
| b. | 40 |
| c. | 65 |
| d. | 80 |
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Answer: (b).40
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| 5. | In producer gas making furnace, steam is added along with air to mainly control the |
| a. | fusion of coal ash & clinker formation. |
| b. | C. V. of producer gas. |
| c. | temperature of producer gas. |
| d. | tar content in producer gas. |
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Answer: (a).fusion of coal ash & clinker formation.
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