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In ______________ drilling pattern, the drill holes slope both in the horizontal and vertical planes.

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In ______________ drilling pattern, the drill holes slope both in the horizontal and vertical planes.

(a) Centre cut

(b) Parallel cut

(c) Pyramidal cut

(d) Straight line cut

I have been asked this question in homework.

Enquiry is from Equipments in chapter Construction Equipments of Construction & Building Materials

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The correct choice is (c) Pyramidal cut

Explanation: Four cut holes are arranged such a manner that when these holes are blasted, pyramidal shaped rock is removed from the surface of the rock. Whereas, in Centre cut pattern, the drill holes are arranged nearly parallel in horizontal plane with a slight inclination.

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