The smoke volatility index is calculated as the smoke point plus______________________?
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Answer: A. 0.42 × (% distilled at 204°C)
Explanation
The smoke volatility index combines the smoke point and a factor related to the distillation percentage at 204°C. This index correlates laboratory combustion behavior with actual field burning performance. Multiplying the 204°C distillation fraction by 0.42 provides the required volatility adjustment. Smoke volatility index is a critical quality standard specifically applied to jet and aviation fuels. Combustion performance depends on both the chemical smoke point and fuel vaporization rates. Distillation curves determine the exact percentage of fuel evaporating at 204 degrees Celsius.
Aviation turbine fuels must satisfy strict smoke volatility limits to ensure safe engine operation. Inadequate volatility can cause incomplete combustion and carbon buildup in high-altitude engines. Refinery quality control engineers calculate this index routinely to verify jet fuel compliance. Adding a fixed 5 mm value ignores the critical distillation percentage component entirely. Using a factor of 0.84 overestimates the volatility contribution in the standard equation. Adding an approximate 10 mm offset lacks the mathematical precision of the established formula.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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