Which of the following statement is true for panel system of working?
A. control of subsidence is difficult and crushing of pillars happens frequently
B. chances for spon heating is maximum resulting in closure of mines
C. it has independent transport, ventilation and loading system
D. crushing of barriers may result in joining of 2 faces
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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