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In ______________ type of drill, the grinding of rock into small particles is carried out through the Abrasive effect of a bit which rotates in the hole.

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In ______________ type of drill, the grinding of rock into small particles is carried out through the Abrasive effect of a bit which rotates in the hole.

(a) Percussion

(b) Abrasion

(c) Pyramidal

(d) Centre cut

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The question is from Equipments topic in portion Construction Equipments of Construction & Building Materials

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The correct choice is (b) Abrasion

The best explanation: Whereas, pyramidal is a cut pattern, in which the drill holes slope both in horizontal and vertical planes. And in Centre cut pattern, the drill holes are arranged nearly parallel in the horizontal plane with a slight inclination.

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