Mining Engineering
2021 · Paper 1
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Complete GATE MN 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 40–42 of 65. Imported answers require review unless explicitly marked reviewed.
Question 30
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In a longwall panel, face is supported with shields of yield capacity 460 tonne per shield. The distance from the canopy tip to coal face is 0.15 m when the support is fully advanced. The depth of the web is 0.60 m. The shields are set skin to skin at the face. Length of the canopy of the shield is 3.25 m and width 1.5 m. Setting capacity is 80% of the yield capacity. The setting resistance at the maximum and minimum span of the coal face, in tonne/m², respectively are
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A 10 ml sample of wastewater is diluted with water having no BOD, to fill a 300 ml BOD bottle. The initial DO of the diluted waste water is 9.0 mg/l. If the BOD₅ of the waste water sample is 60 mg/l, the final DO of the diluted waste water in mg/l, is
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The Mohr circle of stress of a dry porous rock is shown in the figure. If the rock is fully saturated with a pore pressure
, then the Mohr circle takes the form of 
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