GATE MN format:nat PYQs & Answers — Page 27 — Exam Papers

Questions 261–270 of 300. Imported answers require independent review unless marked reviewed.

Topic practice 300 questionsPage 27 of 30

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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In a level terrain, a vertical orebody of 20 m uniform width is worked by surface mining method. The density of the ore is 2.5 tonne/m

. The ultimate pit has a depth of 60 m, width of 20 m at pit bottom, and a pit slope of 45°. The overall stripping ratio for this condition in m

/tonne is ____________________.

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A 20 m long steel tape used for survey is found to be short by 10 cm. If the area measured with the steel tape is 500

, the actual area in

is ____________________.

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The following figure shows the designed blast pattern of a bench. The explosive column is charged at 18 kg/m. If the unit weight of the blasted material is 2.5 tonne/m

, the powder factor for the blast in tonne/kg is ____________.

Diagram for Mining Engineering question 50

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Two points on the equator have longitudes 55°E and 25°W. Considering radius of earth as 6400 km, the distance between the two points in km is ________________.

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Sum of the series 5, 10, 15, …………, 500 is ____________________.

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The sample standard deviation for the following set of observations is ________________. 40, 45, 50 and 55

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For the given function

, the value of

at

and

is _____________________.

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