Coal Mining - Study Mode

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[#456] The average number of faces in the district if number of headings are Q.

(A) 2Q - 1

(B) 2(Q - 1)

(C) Q - 3

(D) 2(Q - 2)

Correct Answer

(A) 2Q - 1

[#457] Length of stowing pipes used in pneumatic stowing.

(A) 1 m

(B) 2 m

(C) 3 m

(D) 4 m

Correct Answer

(C) 3 m

[#458] The number of stowing machines types are

(A) 2

(B) 3

(C) 4

(D) 6

Correct Answer

(A) 2

[#459] Abutment load reaches its maximum value above . . . . . . . .

(A) 5 m

(B) 10 m

(C) 15 m

(D) 20 m

Correct Answer

(C) 15 m

[#460] The contribution of tertiary coal is about, what percent of the country coal resources is about.

(A) 4%

(B) 6%

(C) 1%

(D) 7%

Correct Answer

(C) 1%