GATE MN topic:mining PYQs & Answers — Page 10

Questions 91–100 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 10 of 65

In a shovel dumper combination, the loading time of a dumper is 3 minutes. The shovel serves 8 dumpers. If the cycle time of a dumper including its loading time is 22 minutes, the waiting time of a dumper, in minute, is_____ (in integer)

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An HMX explosive having Velocity of Detonation (VOD) of 10500 m/s is tested by D’Autriche method with a detonating fuse of VOD 7000 m/s, as shown in the figure. The impression mark on lead plate will be obtained at a distance (L), in m, from the mid point of the fuse, is ___ (rounded off to two decimal places)

Diagram for Mining Engineering question 27

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Hydraulic fracturing method is used to determine the major principal stress (

) in an underground rock strata having tensile strength of 6 MPa. The minor principal stress (

) in the strata is 8 MPa. If fluid pressure of 10 MPa is required to fracture the vertical bore in that strata, the magnitude of

, in MPa, is _____ (rounded off to 2 decimal places)

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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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GATE MN topic:mining PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35