Drilling And Blasting - Study Mode

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[#661] Where a pair of taudem cages (accommodating 2 tubs) the finished diameter of shaft may be . . . . . . . .

(A) 2 - 4 m

(B) 5 - 6 m

(C) 6 - 7 m

(D) 8 - 10 m

Correct Answer

(B) 5 - 6 m

[#662] The size of pillar increases with . . . . . . . .

(A) Width

(B) Angle of dip

(C) Depth

(D) None

Correct Answer

(C) Depth

[#663] Door should be open against the air so that air pressurenormally kept closed.

(A) Foul air

(B) Intake air

(C) Return air

(D) Gassy air

Correct Answer

(B) Intake air

[#664] Fine dust of coal defined by its content of . . . . . . . . fraction particles.

(A) -60

(B) -70

(C) -80

(D) -90

Correct Answer

(C) -80

[#665] The weight of 2 hr. duration drager apparatus of BG 174 is . . . . . . . . in kg.

(A) 17.2

(B) 14.5

(C) 13.5

(D) 12.8

Correct Answer

(D) 12.8