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Which type of fuel is lignite?

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Which type of fuel is lignite?

(a) Secondary fuel

(b) Primary fuel

(c) Liquid fuel

(d) Gaseous fuel

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This is a very interesting question from Classification of Fuel topic in portion Fuels and Combustion of Engineering Chemistry II

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The correct choice is (b) Primary fuel

Easiest explanation: Lignite is a primary fuel as it can be extracted from nature without any sort of transformation process. Lignite is soft brown coal. It is considered as the lowest rank of coal.

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