Any clay or shale which does not fuse, below 158°C called
A. Fire clay
B. China clay
C. Kaolin
D. Kaolinite
Answer: Option A
A. Fire clay
B. China clay
C. Kaolin
D. Kaolinite
Answer: Option A
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
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