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________________ type of drill consists of a long Steel bit which is mechanically lifted up and dropped down to disintegrate the rock.

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________________ type of drill consists of a long Steel bit which is mechanically lifted up and dropped down to disintegrate the rock.

(a) Stop hammer

(b) Drop hammer

(c) Steam hammer

(d) Churn drill

This question was posed to me during an interview.

Question is from Equipments in portion Construction Equipments of Construction & Building Materials

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The correct choice is (d) Churn drill

Explanation: Churn Drill can be used to drill holes vertically only. With the help of these drills, it is possible to drill holes of 150 mm diameter or so to a considerable depth, irrespective of the hardness of the rock.

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