Furnace Technology
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.

60
20
5
40

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Furnace Technology
Turn down ratio of a burner

Should be 1:1 for a batch type furnace.
Is the ratio of maximum to minimum permissible heat input rates
Is normally much more for a continuous furnace as compared to a batch furnace
Should be as low as possible i.e., 1 : 2

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