Coal Mining - Study Mode

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[#206] Each bore rod one end is male other end

(A) Female

(B) Naught

(C) Drill bit

(D) None

Correct Answer

(A) Female

[#207] Ducting pipes diameter nearly

(A) 0.2 m

(B) 0.4 m

(C) 0.6 m

(D) 0.8 m

Correct Answer

(C) 0.6 m

[#208] Solid coal pillar left intact during extraction of stook pillar called

(A) Fender

(B) Chowkidar

(C) Slice

(D) Judds

Correct Answer

(A) Fender

[#209] Maximum chances of air blast is associated with

(A) B.G

(B) L/W

(C) Hydraulic

(D) B.P

Correct Answer

(C) Hydraulic

[#210] The shape of the pillar that gives maximum percentage of recovery with speed reduced amount of lift for loading is

(A) Square

(B) Circular

(C) Rhombus

(D) Rectangular

Correct Answer

(D) Rectangular