GATE MN 2018 Paper 1 — page 19

Questions 55–57 of 65. Imported answers require review unless explicitly marked reviewed.

The experiment to determine permeability of a soil sample is illustrated below. The cross-sectional area of the sample is 20.0

. The permeability of the soil sample in cm/s is ____________.

Diagram for Mining Engineering question 45

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In underground face blasting, the pull is found to be 10% less than the drillhole length. The headings of 3.6 m width are supported by prop density of 1.44/m

. The hole length is 1.5 m, and 6 rounds of blasting are done in the panel per shift. The number of props to be erected in a shift is ____________________.

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The immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m x 1.2 m grid pattern. If the unit weight of roof rock is 2.25 tonne/m

and load carrying capacity of each bolt is 7.5 tonne, the factor of safety of the support system is ________________.

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2018 · Paper 1

Question 45

Question 46

Question 47