Coal Mining - Study Mode

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[#231] The gallaries driven through the pillar for forming stooks called . . . . . . . .

(A) Split

(B) Stooks

(C) Slices

(D) Judds

Correct Answer

(A) Split

[#232] The type of drill bit suitable for any type of rock

(A) Fish tail rotory bit

(B) Tricone rock roller bit

(C) Percussive bit

(D) Thermal bit

Correct Answer

(B) Tricone rock roller bit

[#233] In shallow seams to prevent breathing of air to depillared area through cracks to the surface the cracks have to be blanketted with a minimum thickness of layer of sand or earth nearly

(A) 1.2 m

(B) 2 m

(C) 1.5 m

(D) 1 m

Correct Answer

(A) 1.2 m

[#234] When the mineral extracted from underground the void filled with incombustable material, the process called as . . . . . . . .

(A) Goat packing

(B) Pack walling

(C) Stirring

(D) Caving

Correct Answer

(A) Goat packing

[#235] Roads driven parallel to strike in horizon mining tailed

(A) Cross cuts

(B) Levels

(C) Drifts

(D) Laterals

Correct Answer

(D) Laterals