Coal Mining - Study Mode

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[#361] Minimum life of mine should be more than . . . . . . . . years for adopting horizon mining.

(A) 10

(B) 20

(C) 30

(D) 40

Correct Answer

(C) 30

[#362] If the water bearing strata may have several feeders of water at various depths these are sealed by this lining

(A) Brick lining

(B) Concrete lining

(C) Tubbing

(D) Manolith lining

Correct Answer

(C) Tubbing

[#363] The . . . . . . . . holes left in brick wall at the curb level during their construction for escape of water called.

(A) Sleep

(B) Weep

(C) Free

(D) Blast

Correct Answer

(B) Weep

[#364] The relative distance between roof and floor in a vertical plane called

(A) Strain

(B) Bed separation

(C) Subsidence

(D) Convergence

Correct Answer

(D) Convergence

[#365] Drop shaft methods are also called

(A) Caisson methods

(B) Freezing

(C) Cementation

(D) Tubbing methods

Correct Answer

(A) Caisson methods