Coal Mining - Study Mode

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[#441] Number of persons required to operate a electric drill machine

(A) 2

(B) 3

(C) 4

(D) 5

Correct Answer

(C) 4

[#442] In horizon mining, the vertical distance between horizon is

(A) 20 - 40 m

(B) 40 - 60 m

(C) 60 - 200 m

(D) 200 - 250 m

Correct Answer

(C) 60 - 200 m

[#443] Cuttings from bottom of holes removed by circulating fluid under pressure called

(A) Flushing

(B) Water loss

(C) Deviation

(D) All of these

Correct Answer

(A) Flushing

[#444] Discontinuity which separate the sid and sima layer of crust is known

(A) Mohrovisic

(B) Corard

(C) Guttenberg

(D) Repiting

Correct Answer

(D) Repiting

[#445] Upto what gradient the bord and pillar mining adopted without special arrangements.

(A) 1 in 4

(B) 1 in 3

(C) 1 in 5

(D) 1 in 6

Correct Answer

(A) 1 in 4