Multiple choice

Which one of the following fuels is an example of primary fuel?

  1. Petroleum

  2. Coal gas

  3. Water gas

  4. Producer gas
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A Correct answer
Explanation

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.

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