Q355
In a coal mine the depth of working is 200 m from surface, width of galleries 3 m, height of galleries 3 m and distance of square pillars between centres of bords is 22.5 m. What is strength of the pillar
A.
128.53 kg/cm2
B.
138.97 kg/cm2
C.
142.05 kg/cm2
D.
139.97 kg/cm2
AnswerAnswer: Option D
Solution
Answer: Option D
No explanation is given for this question Let's Discuss on Board