To make the roof stitching technique effective it is recommended that
A. Face should not advance more than 2.4 m from last tensioned rope
B. Short ropes should be used in between long ropes
C. Rope should be tensioned while using good wooden sleepers
D. All of these
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Supports And Strata Control
Related Questions on Mine Supports and Strata Control
The minimum length of sleeper used as chock support of the roof height to be supported excess of 3m.
A. 1.2 m
B. 1.5 m
C. 1.6 m
D. 1 m
The preferred shape of an opening in uniaxial stress field as
A. Circle
B. Ellipse
C. Ellipse with proper axis ratio
D. Ovaloid
Most of the Gondwana coals from any field are rich in . . . . . . . .
A. Durain
B. Fusain
C. Vitrain
D. Clairain
Join The Discussion