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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