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Insoluble residue test is used to determine______

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Insoluble residue test is used to determine______

(a) additives

(b) insoluble particles

(c) pour point

(d) fire point

The question was asked in my homework.

The question is from Testing of Lubricants in chapter Lubrication and Lubricants of Automotive Engine Design

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Best answer
Right option is (b) insoluble particles

Easy explanation: A known weight of the lubricating oil is dissolved in spirit .the solution is filtered and the residue is washed with pure solvent, dried, and weighed. From this percentage of insoluble residue in the oil is calculated.

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