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Lubrication is needed in engines because of ___________

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in Farm Machinery by (38.9k points)
Lubrication is needed in engines because of ___________

(a) Viscosity

(b) High temperature

(c) Friction

(d) Higher draft

I got this question in a national level competition.

I would like to ask this question from Principles of Forced Feed System in chapter Lubrication System and Tractor’s Classification of Farm Machinery

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The correct choice is (c) Friction

Easiest explanation: Lubrication produces the following effect- reducing frictional effect, cooling effect, sealing effect, cleaning effect. Lubrication forms on oil fil between two moving surfaces and reduces friction and wear between two resulting surfaces.

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