GATE MN format:nat PYQs & Answers — Page 4

Questions 31–40 of 300. Imported answers require independent review unless marked reviewed.

Topic practice 300 questionsPage 4 of 30

The value of

is, _____ (rounded off to 1 decimal place)

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The box plot of a data set is shown below

Diagram for Mining Engineering question 30

The interquartile range of the data set is_____ (in integer)

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The unadjusted RMR of a tunnel roof is 64. A single joint set exists in the roof as shown in the figure.

Diagram for Mining Engineering question 31

Using the abridged RMR table for adjustment orientation, the RMR is _____ (in integer)

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In a ventilation network, three airways with resistances of 4.0 Ns

, 6.25 Ns

and 9.0 Ns

are connected in parallel. The equivalent resistance of the network in Ns

is_____ (rounded off to 2 decimal places)

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In a bord and pillar panel, the following data are obtained

Number of blasting rounds per shift : 8

Face dimension (m × m) : 4.2 × 2.5

Average pull (m) : 1.2

Specific gravity of coal : 1.4

Manpower per shift : 100

The OMS (output per manshift) of the panel, in tonne, is _____ (rounded off to 2 decimal places)

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If the in-situ density of coal is 1320 kg/m

and the density of blasted coal is 952 kg/m

, the swell factor is_____ (rounded off to 3 decimal places)

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The relevant information on metal extraction from a copper mine are given below

Selling price of copper (Rs./kg) = 900

Mining cost (Rs./tonne of ore) = 500

Processing cost (Rs./tonne of ore) = 2000

Overall recovery of copper metal (%) = 70

Ignoring all other costs, the breakeven cutof grade of copper, in %, is _____ (rounded off to 2 decimal places)

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A constant feed of 400 mL/s is maintained by a Xanthe column of height H as shown in the figure. The outlet cross section area is

. The acceleration due to gravity is 10 m/s². Neglecting friction and other losses, the value of H, in cm, is ____ (rounded off to 2 decimal places)

Diagram for Mining Engineering question 43

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A continuous miner serves two shuttle cars of 12 tonne capacity each. Shuttle cars I and II operate with a total cycle time of 12 minutes and 15 minutes respectively, which includes loading time of 8 minutes for each car. The production rate of the continuous miner, in tonne/hour, is ________ (rounded off to 2 decimal places)

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In a sublevel stope, a ringhole blast round is designed for winning 2500 tonne of ore with 8.0 % metal content. The blast results into breakage of 90.0 % of the design blast round. Overbreak of 250 tonne wallrock with 0.5 % metal content dilutes the blasted ore. The total metal content, in tonne, considering 95 % recovery of the blasted muck from the stope, is _______ (rounded off to 2 decimal places)

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GATE MN format:nat PYQs

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35

Question 43

Question 44

Question 45