GATE MN topic:mining PYQs & Answers — Page 12

Questions 111–120 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 12 of 65

In a surface mine, blasting is carried out using electronic detonator and cartridge emulsion explosive with following details:

Burden = 3.5 m

Spacing = 4.5 m

Bench height = 10.0 m

Subgrade drilling = 1.0 m

Stemming = 4.0 m

Linear charge concentration = 16 kg/m

Cost of one detonator = Rs. 800

Cost of explosive = Rs. 30/kg

The cost of blasting material per cubic meter of blasted rock, in Rs., is ______ (rounded off to 2 decimal places).

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A pit slope has the following information:

Number of benches = 5

Height of each bench = 8 m

Bench slope angle = 70 degree

If width of one bench is 24 m and that of other four benches is 10 m each, the overall pit slope angle, in degree, is ________ (rounded off to 2 decimal places).

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A direct rope haulage has the following details

Output = 24 tonne/hour

Length of trip = 610 m

Gradient = 1 in 12

Capacity of mine car = 1.0 tonne

Tare weight of mine car = 0.5 tonne

Average rope speed = 1.694 m/s

Change over time of cars = 3 minute

Acceleration due to gravity = 10.0 m/s^2

Neglecting all frictional resistance and mass of the rope, the minimum power required, in kW, to raise the loaded mine cars is ______ (rounded off to 3 decimal places).

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A mine void of dimension 100.0 m x 2.0 m x 1.2 m is to be filled in 3 hours by hydraulic stowing. The sand to slurry ratio is 0.4. If the hydraulic fill factor is 0.9, the hourly consumption of water for the operation, in m^3, is____ (rounded off to 2 decimal places).

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A 2.5 tonne diesel locomotive hauls 5 mine cars upslope having a gradient of 1 in 20. The constant tractive force of the locomotive is 1800 kN. The gross weight of a car is 3 tonne. Acceleration due to gravity is 10.0 m/s^2. If the acceleration of the system is 0.5 m/s^2, the rolling resistance in kN/tonne is______ (rounded off to 3 decimal places).

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A longwall panel is to be developed in a flat seam at a depth of H m. The surface subsidence profile (s) of the area with the horizontal distance x is estimated as

where, S_ is the maximum subsidence at the centre of the panel, x is measured from the inflection point. The value of x is negative towards the panel centre and positive towards the panel boundary.

The ratio between the critical width of the panel and the depth is_____ (rounded off to 2 decimal places).

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The percent Fe content of a random sample consisting of five observations is shown.

62 | 64 | 63 | 60 | 61

If mean grade of the stockpile is estimated using the above data, the standard error of mean grade, in %, is _____ (rounded off to 3 decimal places).

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In a bord and pillar panel, a square pillar of size 35 m × 35 m (centre to centre) is extracted to form four equal square-shaped stooks as shown. The width of each gallery and crosscut is 5 m. The height of the working seam is 3 m. The reduction in safety factor after pillar splitting by using Bieniawski’s pillar strength formula, in %, is____ (rounded off to 2 decimal places)

Bieniawski’s pillar strength formula,

; where,

= strength of 0.9 m^3 of coal block,

= pillar width and

= mining height

Diagram for Mining Engineering question 53

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A five-member truss system is shown in the figure. The maximum vertical force P in kN that can be applied so that loads on the member CD and BC do NOT exceed 50 kN and 30 kN, respectively is________ (rounded off to 2 decimal places).

Diagram for Mining Engineering question 54

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The characteristic polynomial of a third order matrix, A, is given by

If one of the eigen values of A is 1, then sum of the other two eigen values is ______ (in integer)

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GATE MN topic:mining PYQs

Question 46

Question 47

Question 48

Question 49

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55