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 cutI got this question in homework.The question is from Equipments topic in portion Construction Equipments of Construction & Building Materials

In ______________ type of drill, the grinding of rock into small parti

1.	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 cutI got this question in homework.The question is from Equipments topic in portion Construction Equipments of Construction & Building Materials
Answer» 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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