The yeilding props which accept the maximum load with minimum yeild called
A. Lead bearing prop
B. Early bearing props
C. Yeild load
D. Setting load
Answer: Option B
A. Lead bearing prop
B. Early bearing props
C. Yeild load
D. Setting load
Answer: Option B
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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