Which of the following statement is true for long wall mining?
A. maximum tensile stress remains at the edge of gob
B. maximum tensile stress remains at the centre of gob
C. maximum tensile stress will shift from edge to centre of the gob
D. maximum tensile stress shall remain away from the chain pillar
Answer: Option B
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
A. Normal distribution
B. Skewed distribution
C. Lognormal distribution
D. Poisson distribution
A. 3 level heading district
B. 4 level heading district
C. 5 level heading district
D. 6 level heading district
It is very difficult to control shaley roof if coal is not left with the shale why?
A. It is weak in nature
B. It has weathering effect
C. It has great affinity to absorb moisture and get departed from immediate roof
D. It reacts with coaly surface
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