Coal Mining - Study Mode

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[#311] The minimum thickness of the seam to adopt BG method.

(A) 10 m

(B) 4 m

(C) 6 m

(D) 7 m

Correct Answer

(D) 7 m

[#312] The stowing efficiency in penumatic stowing is

(A) 50%

(B) 60%

(C) 70%

(D) 80%

Correct Answer

(C) 70%

[#313] Broken working referred as

(A) Pillar cutting

(B) Solid wire blast

(C) Caving

(D) First working

Correct Answer

(A) Pillar cutting

[#314] The hydraulic prop built up its full bearing load with an yield less than . . . . . . . . cm.

(A) 2.54

(B) 3.5

(C) 2

(D) 1.8

Correct Answer

(A) 2.54

[#315] The roof fall which is not extended to surface

(A) Main fall

(B) Local fall

(C) Burst

(D) Air blast

Correct Answer

(B) Local fall