Question

What are primary fuels?

Answer 1

Primary fuels or primary energy sources are dense sources of primary  energy found as natural resources. Primary fuels are fuels that are found in nature and can be extracted, captured, cleaned, or graded without any sort of energy conversion or transformation process.....

Answer 2

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Primary Fuel

Fuels which are used in the same form as they occur in the nature are called primary fuels. For nample, wood, cow dung, agricultural wastes, natural gas, etc.