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Which fuel is commonly available in both caking and Non-caking forms?

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Which fuel is commonly available in both caking and Non-caking forms?

(a) Lignite

(b) Bituminous coal

(c) Peat

(d) Anthracite

I have been asked this question in exam.

My enquiry is from Types of Fuels topic in chapter Steam Power Plant of Energy Engineering

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Best answer
The correct choice is (b) Bituminous coal

Best explanation: Bituminous coal is the most commonly used form of coal. It is available in both caking and non-caking forms. It burns with a yellow flame. It has calorific value of about 32000 kJ/kg. It consists of 81%C; 5%H2; 8% O2; 1.5% N2; 1% S; and 3.5% ash. Caking bituminous coal softens and forms a pasty mass if heated at higher temperature. This coal is used to manufacture coke. Non-caking bituminous coal doesn’t soften on heating and hence it is used in steam power plants.

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