Drilling And Blasting - Study Mode

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[#351] The pressure of forcing fan has effect of keeping the gases in . . . . . . . .

(A) Face

(B) Goaf andold workings

(C) Junctions

(D) Raises

Correct Answer

(B) Goaf andold workings

[#352] For introduction of solid blasting need apporval from DGMS for exemption under following regulation.

(A) 173

(B) 175

(C) 168

(D) All

Correct Answer

(D) All

[#353] Water infusion is one of the method of prevention of dust at the faces.

(A) No

(B) Yes

(C) Some times No and sometimes correct

(D) None

Correct Answer

(B) Yes

[#354] When coal dust propagates explosion . . . . . . . . as in case of gas explosion.

(A) Flame back

(B) Flame up

(C) Flame down

(D) Flame front

Correct Answer

(D) Flame front

[#355] Coal more liable to spontanious heating when thesebands present

(A) Vltrain

(B) Durain

(C) Fusain

(D) Clairain

Correct Answer

(A) Vltrain