Which outcome results when oil viscosity in rotary vacuum pump lubricating system decreases due to contamination?

💡 Explanation

When oil viscosity decreases, the oil's sealing efficiency is reduced, favoring increased backstreaming because the mean free path of the oil molecules increases, enhancing molecular diffusion. Therefore backstreaming increases, rather than reduced drag, vapor density increases, or elevated speed, each requiring high oil viscosity for the mechanisms involved to operate correctly.

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