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Fuels are classified as primary and secondary fuel based on the __________

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Fuels are classified as primary and secondary fuel based on the __________

(a) Capacity to burn

(b) Availability

(c) State

(d) Occurrence

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The question is from Types of Fuels in division Steam Power Plant of Energy Engineering

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Right option is (d) Occurrence

Explanation: Based on the occurrence, fuels are classified as primary fuels and secondary fuels. A primary fuel is available in nature E.g., wood, peat, lignite, natural gas, petroleum, etc. A primary fuel is also called as a natural fuel. A secondary fuel is not available in nature, but it is prepared from primary fuel by artificial means e.g. gasoline, diesel, coke gas, blast furnace gas, kerosene etc. A secondary fuel is also known as artificial fuel.

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