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Emulsion is a mixture of ______and ______when mixed thoroughly.

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Emulsion is a mixture of ______and ______when mixed thoroughly.

(a) lubricating oil and acid

(b) water and acid

(c) lubricating oil and water

(d) lubricating oil and base

The question was asked during an interview.

My question is based upon Testing of Lubricants topic in portion Lubrication and Lubricants of Automotive Engine Design

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Correct option is (c) lubricating oil and water

For explanation: When lubricating oil mixes thoroughly with water, an intermediate mixture of the two knows as an emulsion. The lesser the emulsification tendency, the better the oil is. A good lubricant should be such that the emulsion is formed, should break off quickly.

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