GATE MN format:nat PYQs & Answers — Page 3 — Exam Papers

Questions 21–30 of 300. Imported answers require independent review unless marked reviewed.

Topic practice 300 questionsPage 3 of 30

A regular shaped cut and fill stope is shown. Pillars of size 4 m × 4 m are left at an interval of 13 m along the length of the stope. If the density of the mined ore is 2.5 tonne m

, and slices are extracted to the full stope width, the total tonnage of ore recovered from the 1

slice of the stope is __________ × 10

. (rounded off to one decimal place)

Diagram for Mining Engineering question 59

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A coal seam of 2.4 m thickness is mined with a DERD shearer at a cutting speed of 0.6 km h

. The web depth of the cut is 0.5 m. The average cross-sectional area of coal on the AFC during transportation is 0.24 m

. For the evacuation of cut coal from the face with 10% spillage, the required minimum velocity of the AFC, in m s

, is ____________. (rounded off to two decimal places)

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A bord and pillar panel has 24 developed pillars of size 40 m × 40 m (centre to centre) under extraction. The following information is given:

Gallery width = 4 m Extraction height = 3 m Extraction ratio during depillaring = 80% Specific gravity of coal = 1.4 Incubation period = 6 months Average working days per month = 25

In order to extract the panel within the incubation period, the minimum rate of production, in tonne per day, is ______________. (rounded off to one decimal place)

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Following observations were taken using a Tacheometer with staff held vertical. The additive and multiplying constants of the instrument are 0 and 100, respectively. The reduced level (RL) of the staff station R, in m, is _____________. (rounded off to two decimal places)

Instrument station P; staff stations Q and R. Staff readings at Q: 1.4, 2.7, 3.9; vertical angle: 7°; at R: 2.1, 2.8, 3.6; vertical angle: 5°. RL of Q = 102 m.

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A truss PQR carries vertical load of 10 kN at Q as shown. The force in member PR, in kN, is ________________. (rounded off to two decimal places)

Diagram for Mining Engineering question 63

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Two blocks P and Q weighing 100 kN and 200 kN, respectively, are connected by a string passing through a massless and frictionless pulley as shown. The friction coefficient between blocks P and Q is 0.4, and that between block Q and surface is 0.3. The minimum force, F, in kN, required to pull the block Q, is ______________. (answer in integer)

Diagram for Mining Engineering question 64

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In a uniaxial compressive strength test, a 120 Ω strain gauge of gauge factor 2.0 is pasted on the rock sample as shown. At the end of the test, the change in resistance of the strain gauge is 0.5 Ω. The longitudinal deformation of the sample, in mm, is ________________. (rounded off to two decimal places)

Diagram for Mining Engineering question 65

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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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