Which of the following is a primary fuel ?
Correct answer: C. Natural gas
- A. Blast furnace coke
- B. Gasoline
- C. Natural gas
- D. Wood charcoal
Explanation
Natural gas is a primary fuel because it occurs naturally and is used directly for combustion. Gasoline, coke and charcoal are processed or manufactured fuels, so they are classified as secondary fuels.
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