The support used in sound roof with minimum lateral roof movement is
A. Chock type
B. Bar type
C. Shield type
D. Prop type
Answer: Option A
A. Chock type
B. Bar type
C. Shield type
D. Prop type
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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