A. less than 1 cu.m/ton of coal produced
B. more than 1 cu.m. but less than 5 cu.m
C. more than 1 cu.m. but less than 10 cu.m
D. more than 10 cu.m
Answer: Option C
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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