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_______________ is a Rotary type drill and its abrasive power depends on the bit which is in the form of a section of steel pipe with serrated or a roughened lower end.

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_______________ is a Rotary type drill and its abrasive power depends on the bit which is in the form of a section of steel pipe with serrated or a roughened lower end.

(a) Shot drill

(b) Churn drill

(c) Piston drill

(d) Tripod drill

The question was posed to me by my school teacher while I was bunking the class.

My doubt is from Equipments topic in chapter Construction Equipments of Construction & Building Materials

1 Answer

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Right option is (a) Shot drill

Easy explanation: The Shot drill bit is rotated under pressure and the cuttings are removed by water which is supplied through the drill rod. Standard shot drills can drill holes to a depth of about 180 metres or more with diameter varying from 65 mm to 500 mm. It is possible to drill rock of any hardness with the help of these drills.

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