Mining Engineering
2019 · Paper 1
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Complete GATE MN 2019 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.
Question 48
Open questionMNNAT2 marksNeeds review
In a bord and pillar panel, 6 square pillars are developed as shown in the figure below. The depth of the seam is 300 m and the average unit weight of overburden rock is 25 kN/m
. If the pillar strength is 15 MPa, the safety factor of the shaded pillar zone (round off to two decimal places) is 
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Water enters a sump having the shape of an inverted frustum at a rate of 500 m
/h. The sump is initially filled up to 2.0 m height. The time taken in days to fill the remaining part of the sump (rounded off to one decimal places) is 
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The uniaxial stress-strain behavior of a rock sample is shown in the figure.
The elastic modulus E is 20,000 MPa. If
is the plastic strain, the value of the damage parameter D (rounded off to two decimal place) is _____.Log in to check the answer
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