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Which fuel is commonly available in both caking and Non-caking forms?(a) Lignite(b) Bituminous coal(c) Peat(d) AnthraciteI have been asked this question in exam.My enquiry is from Types of Fuels topic in chapter Steam Power Plant of Energy Engineering

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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