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_________________ is a rotary drill and it consists of steel pipe stem on the bottom of which is attached to a roller bit.

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_________________ is a rotary drill and it consists of steel pipe stem on the bottom of which is attached to a roller bit.

(a) Blasthole

(b) Diamond

(c) Shot

(d) Percussion

I have been asked this question during an interview.

My question is taken from Equipments in division Construction Equipments of Construction & Building Materials

1 Answer

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Best answer
Correct choice is (a) Blasthole

Best explanation: The Blasthole drill bit, as it rotates over the rock, disintegrates it and the cuttings are removed by a stream of compressed air. The blast of compressed air also cools down the bit. The Blasthole drill is a self propelled drill.

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