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Question
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 ?
Options:
A .  5
B .  60
C .  20
D .  40
Answer: Option C
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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