Which fuel is called secondary stage in the formation of coal?(a) Lignite(b) Bituminous coal(c) Peat(d) AnthraciteI had been asked this question in an online interview.Origin of the question is Types of Fuels topic in section Steam Power Plant of Energy Engineering

Which fuel is called secondary stage in the formation of coal?(a) Lign

1.	Which fuel is called secondary stage in the formation of coal?(a) Lignite(b) Bituminous coal(c) Peat(d) AnthraciteI had been asked this question in an online interview.Origin of the question is Types of Fuels topic in section Steam Power Plant of Energy Engineering
Answer» Correct option is (a) Lignite Easiest explanation: Lignite is the secondary stage in the formation of coal. It is brown in COLOR and hence known as brown coal. It is used as a LOW grade fuel especially for domestic use and also as a boiler fuel. It is the intermediate stage between bituminous coal and peat. It has a calorific value of about 12500 kJ/kg. It consists of 66% C; 5% H2; 20% O2; 1% N2; 1% S and 3.5% ash and other incombustible.

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Which fuel is called secondary stage in the formation of coal?(a) Lignite(b) Bituminous coal(c) Peat(d) AnthraciteI had been asked this question in an online interview.Origin of the question is Types of Fuels topic in section Steam Power Plant of Energy Engineering

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