Metal Mining - Study Mode

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[#136] Which blast indicator of an explosive shows its ability to break solid hard rock.

(A) Strength

(B) Detonation impedence

(C) Detonation pressure

(D) Vod

Correct Answer

(C) Detonation pressure

[#137] In raise drilling, the drill machine normally operated by a crew of . . . . . . . . men.

(A) 3

(B) 2

(C) 4

(D) 1

Correct Answer

(B) 2

[#138] The mining method in which masses, panels of ore are under cut to induce caving, permitting the broken ore to be drawn off below.

(A) Sublevel caving

(B) Intergal caving

(C) Block caving

(D) Blasting gallery

Correct Answer

(C) Block caving

[#139] Can we use the crater blasting in under ground mines?

(A) Yes

(B) No

(C) Partially Yes

(D) Partially No

Correct Answer

(A) Yes

[#140] No working shall be extended further than a specified distance, from the boundaries of any mine the specified distance . . . . . . . .

(A) 15 m

(B) 7.5 m

(C) 60 m

(D) 15 m

Correct Answer

(B) 7.5 m