The visual color of a gasoline sample serves as a qualitative indicator of its _________________?
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Answer: C. Gum forming tendency & thoroughness of refining
Explanation
Visual color of a gasoline sample serves as a qualitative indicator of refining thoroughness. Discoloration in refined gasoline points toward the presence of unstable compounds forming gum deposits. Clean visual appearance helps operators quickly spot contamination or inadequate chemical treatment stages. Gasoline is naturally a clear or pale yellow liquid composed of volatile light hydrocarbons. Gum formation occurs when reactive olefins oxidize and polymerize during prolonged storage periods. Refineries use various washing and sweetening steps to remove reactive gum precursors completely.
Quality control laboratories rely on visual checks alongside standard ASTM tests to ensure product stability. Gum deposits in fuel systems can clog carburetor jets and form sticky intake valve deposits. Ensuring high refining thoroughness prevents customer vehicle performance issues and fuel system failures. Option A requires specialized cooperative engines rather than simple visual inspection methods. Option B evaluates lead response characteristics through standardized laboratory blending test procedures. Option D is incorrect because visual color provides valuable qualitative information about refining quality.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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