GATE 2017-2018 :: GATE Mining Engineering
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Given the following,Excavating/loading machine Transportation schemeP Bucket Wheel Excavator 1 Mine tubQ Continuous Miner 2 Armoured flexible chain conveyorR Shearer 3 Shiftable ConveyorS Load Haul Dumper 4 Shuttle carthe correct match is
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A sub-critical subsidence profile is shown in the figure below. The points A, B, C, and D represent respectively the points of
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The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria the maximum principal stress at failure in MPa is (consider rock constants as m = 7.88, s = 1.0 and a = 0.5)
- A wire of length L is cut into two pieces to construct a circle and an equilateral triangle such that the combined area is minimum. The length of the wire used to construct the circle is
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Pressure characteristic of a mine fan is given by, P = -0.06 Q2 + 400, where P is the pressure in Pa and Q the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8.The mine quantity in m3/s is
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Pressure characteristic of a mine fan is given by, P = -0.06 Q2 + 400, where P is the pressure in Pa and Q the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8.An identical fan is installed in the mine to operate in series with the existing fan. The new mine quantity in m3/s is
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The following observations are taken during a closed traverse.
The closing error of the traverse in mm is -
Economic analysis of an iron ore deposit reveals that the net value of the ore is related to the grade mined as shown in the table.
Assuming linear relationship between the net value and grade, the break-even cut-off grade in % Fe is -
Economic analysis of an iron ore deposit reveals that the net value of the ore is related to the grade mined as shown in the table.Assuming that the grade follows normal distribution with mean 62.7%, and standard deviation 10.0% (A portion of the standard normal distribution table is given below),
the percentage of waste in the deposit based on the break-even cut-off grade is -
A 4.6 m wide vein dipping at 800 is mined by horizontal cut-and-fill stoping method. The fill is to be placed in the stope along the length of 46 m and to a height of 3.0 m. If the specific weight of the fill material is 15.86 kN/m3 and the porosity is 35%, under fully saturated conditionsthe volume of water in the fill in m3 is
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A.
zero vertical displacement, maximum tension, inflexion, maximum compression
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B.
inflexion, maximum tension, maximum compression, zero vertical displacement
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C.
maximum tension, inflexion, maximum compression, zero vertical displacement
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D.
maximum compression, maximum tension, inflexion, zero vertical displacement
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