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What gaseous Fuel is obtained by passing steam over candescent coke?

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What gaseous Fuel is obtained by passing steam over candescent coke?

(a) Producer gas

(b) Water gas

(c) Coal gas

(d) Coke over gas

I had been asked this question during an internship interview.

I'd like to ask this question from Gaseous Fuels & Nuclear Fuels in section Steam Power Plant of Energy Engineering

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The correct option is (b) Water gas

The explanation: Water gas is obtained by passing steam over candescent coke. It burns with a blue flame and hence it is known as blue water gas. It has calorific value ranging between10500KJ/mm^3 to 2300KJ/mm^3. It is used in welding and in furnaces.

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