_________________ 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) PercussionI have been asked this question during an interview.My question is taken from Equipments in division Construction Equipments of Construction & Building Materials

_________________ is a rotary drill and it consists of steel pipe stem

1.	_________________ 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) PercussionI have been asked this question during an interview.My question is taken from Equipments in division Construction Equipments of Construction & Building Materials
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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