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Furnace Technology-Data Intensity 4 Multiple Questions and Answers.
| 1. | Which of the following is not a directly fired furnace ? | ||
| A. | By-product coke oven | ||
| B. | Calcination kiln | ||
| C. | Sintering furnace | ||
| D. | Open hearth furnace | ||
| 2. | Thermal efficiency of an open hearth furnace may be about ______ percent? | ||
| A. | 5 | ||
| B. | 20 | ||
| C. | 50 | ||
| D. | 80 | ||
| 3. | The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____ furnace? | ||
| A. | Arc | ||
| B. | Resistance | ||
| C. | Low frequency induction | ||
| D. | High frequency induction | ||
| 4. | 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 above | ||
| 5. | Artificial draught produced by a fan in the furnace can be controlled by the___? | ||
| A. | Speed of the fan | ||
| B. | Damper | ||
| C. | Variation in the pitch of fan blades | ||
| D. | All of Above | ||
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