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________________ based lubricants do not work well on diamond drill bits.

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in Construction & Building Materials by (190k points)
________________ based lubricants do not work well on diamond drill bits.

(a) Water

(b) Oil

(c) Grease

(d) Gum

I have been asked this question in a national level competition.

Question is taken from Equipments topic in division Construction Equipments of Construction & Building Materials

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Correct option is (b) Oil

To elaborate: Water or coolant must always be used to cool and lubricate the tip. The lubrication reduces heat, prolonging drill bit life and helps to avoid heat fractures in the material. Water is most often used as a lubricant, since it works very well and has no cost.

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