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Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C. | |
A. | 5 [Wrong Answer] |
B. | 60 [Wrong Answer] |
C. | 20 [Correct Answer] |
D. | 40 [Wrong Answer] |