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Which of the following is not used as a fuel in an open hearth furnace?

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in Casting-Forming-Welding II by (119k points)
Which of the following is not used as a fuel in an open hearth furnace?

(a) Atomised oil

(b) Natural gas

(c) Peat

(d) Producer gas

The question was asked in class test.

I'd like to ask this question from Open Hearth Surface topic in chapter Metal Furnace and Practice of Casting-Forming-Welding II

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The correct option is (c) Peat

For explanation I would say: Only gaseous fuels are used for the burning process in an open hearth furnace. Peat is a very basic form of coal and cannot be used as a fuel here.

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