What compositional data is provided by an ultimate analysis of fuel_____________________?
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Answer: B. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
Explanation
An ultimate analysis provides a comprehensive elemental breakdown of a fuel sample by measuring chemical constituents. It determines exact mass percentages of carbon, hydrogen, nitrogen, sulfur, oxygen, and non-combustible ash present. These percentages are expressed strictly as weight fractions to facilitate accurate combustion stoichiometry and flue gas calculations. Ultimate analysis requires laboratory equipment such as gas chromatographs and elemental analyzers to burn and measure combustion products. Knowing carbon and hydrogen weight fractions allows engineers to calculate theoretical oxygen and air requirements for complete combustion. It differs fundamentally from proximate analysis, which measures moisture, volatile matter, fixed carbon, and ash percentages.
Option A incorrectly specifies percentages by volume rather than the standard mass fractions used in ultimate analysis. Options C and D describe a proximate analysis, which categorizes fuel constituents like moisture and volatiles rather than elements. Option E refers to heating value metrics rather than the elemental chemical composition determined by ultimate analysis.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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