Coal Mining - Study Mode

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[#221] The fall which takes place soon after withdrawal of supports called

(A) Normal Collapse

(B) Local fall

(C) Main fall

(D) Premature fell

Correct Answer

(B) Local fall

[#222] Double tube core barrel is suitable for rocks of

(A) Hard

(B) Homogeneous

(C) Soft

(D) Very hard

Correct Answer

(C) Soft

[#223] Hydrogenation invented in the year

(A) 1904

(B) 1924

(C) 1934

(D) 1914

Correct Answer

(D) 1914

[#224] During development the height of the gallery should not exceed

(A) 2 m

(B) 3 m

(C) 4 m

(D) 5 m

Correct Answer

(B) 3 m

[#225] The strata through which shaft has to be sunk may be divided into . . . . . . . . groups.

(A) 1

(B) 2

(C) 3

(D) None

Correct Answer

(C) 3