__________ treatment is done for appreciable improvement in viscosity index of lubricating oil.
A. Acid
B. Solvent extraction
C. Alkali
D. Clay
Answer: Option B
Related Questions on Petroleum Refinery Engineering
Aniline point test of an oil qualitatively indicates the __________ content of an oil.
A. Paraffin
B. Olefin
C. Aromatic
D. Naphthene
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