Coal Mining - Study Mode

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[#56] Hangers diameter are

(A) 10 mm

(B) 15 mm

(C) 25 mm

(D) 30 mm

Correct Answer

(C) 25 mm

[#57] Fastest raising is

(A) Single compartment

(B) Double compartment

(C) Longhole

(D) Conventional drilling

Correct Answer

(C) Longhole

[#58] A coal bed with a methane content is greater than . . . . . . . . m 3 /te. has been considered coal and gas out burst prone.

(A) 2

(B) 5

(C) 9

(D) 15

Correct Answer

(C) 9

[#59] Sillicatisation is the process of

(A) Treating holes

(B) Test holes

(C) Weep holes

(D) Break holes

Correct Answer

(A) Treating holes

[#60] Stables usually . . . . . . . . ahead of face in advancing longwall.

(A) 6 - 8

(B) 4 - 6

(C) 8 - 10

(D) 10 - 12

Correct Answer

(C) 8 - 10