Question

98. Which of the following are considered the two wear modes for lubricated surfaces (a) Sliding and Rolling. (b) Contact and non-contact. (c) Adhesive and Abrasive. (d) None of the above.

99. Which factor is important in establishing a hydrodynamic film between two surfaces. (a) viscosity (b) speed (c) pressure (d) All of the above.

100. Galling, scuffing, seizing and severe sliding are synonyms of what kind of wear? (a) Corrosion (b) Adhesion (c) Abrasion (d) Erosion

Answer 1

98.correct option B(Contact and non-contact)

Reason:In this wear modes the lubricant film exits.

Reasons for incorrect options:

Adhesive and Abrasive: used for plastic contact between surfaces

Sliding and Rolling:It is not considered as lubricant surface

99.Correct Option D(All the above)

Reason:The important factor is viscosity,as it provides more thickness film whenever we use liquid having more viscosity

And also speed and pressure are internally interlinked with viscosity as

At High speed , high viscosity and a sufficient pressures will develop which is important in establishing the hydrodynamic film between two surfaces

100.Correct Option B(Adhesion)

Reason:Galling is a form of wear which is caused by adhesion

Reasons for incorrect options:

The given synonyms are not related to these wears.