Coal Mining - Study Mode

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[#281] In longwall face cut by double back shuffle, can be only worked with

(A) Plough

(B) DERD

(C) Fixed drum shearer

(D) SERD

Correct Answer

(B) DERD

[#282] In shaft sinking the holes are generally drilled by

(A) Electric drills

(B) Stopers

(C) Jack hammer

(D) Well hole drills

Correct Answer

(C) Jack hammer

[#283] Wireline drilling is possible upto a depth of

(A) 250 m

(B) 500 m

(C) 750 m

(D) 1000 m

Correct Answer

(D) 1000 m

[#284] Flap valve provided in

(A) Core barrel

(B) Sludger

(C) Strirrup

(D) Bull dog safety device

Correct Answer

(B) Sludger

[#285] Once the pillar extraction is commenced the splitting of pillars may be done upto pillars ahead of the pillar is under extraction.

(A) 2

(B) 1

(C) 3

(D) 4

Correct Answer

(A) 2