When props and bars are used for supporting the long wall face. In Indian mines, which type of system is used for longwall face.
A. Triangular or straight bar system
B. Goaf bar system
C. Staggered bar system
D. Saw toothed bar system
Answer: Option A
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