Furnace Technology
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.

4500
2000
3000
6000

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Furnace Technology
Turn down ratio of a burner

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

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