Question

Select the incorrect statement from the following option.

(a) Viscosity helps in the selection of good lubricating oil

(b) Light oils have low densities and easy flowability

(c) Heavy oils are used on parts moving with high speed

(d) Light oils do not impose much drag on high-speed parts

I got this question in an online interview.

This interesting question is from Viscosity topic in chapter Criteria of Purity and Characterisation of Materials of Engineering Chemistry I

Answer 1

Correct choice is (c) Heavy oils are used on parts moving with high speed

For explanation: Heavy oils are used on parts moving with slow speed under heavy loads. All the other options are correct. Viscosity helps in the selection of good lubricating oil, light oils have low densities and easy flowability and do not impose much drag on high-speed parts.