GATE 2017-2018 :: GATE Mining Engineering
- A 20 m steel tape used in a mine survey is found to be 20 cm short when compared with a standard tape. If the measured volume of a dump using the tape is 4000 m3, its actual volume in m3 is
- A mine worker inhales normal air; whereas, the exhaled air contains 16.65% O2 and 3.83% CO2. The respiratory quotient of breathing for the worker is
- The boundary of a mine is plotted on a scale of 1:2000. If a planimeter measures the plotted area as 58 cm2, the actual mine area in m2 is
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For a shrinkage stope the following data values are givenInsitu tonnage 9000 tonneInsitu grade 5.2 g/tonneAverage grade of waste 1.4 g/tonneLoss of ore in the stope 10%Dilution 20%The grade at the mill-head in g/tonne is ________
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In an experiment to determine specific gravity of a soil sample, the following data is obtained:Mass of empty pycnometer 20.4 gMass of pycnometer with soil sample 51.6 gMass of pycnometer with soil sample filled with water 88.6 gMass of pycnometer filled with water 70.4 gThe specific gravity of the sample is __________
- A cylindrical rock specimen of diameter 54 mm has Young's modulus of 68.97 GPa and Poisson's ratio of 0.35. The rock specimen fails in uniaxial compression at a lateral strain of 0.01%. The axial load at failure in kN is __________
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An open belt drive connects two pulleys on parallel shafts that are 3.6 m apart as shown in the figure. The diameters of the pulleys are 2.4 m and 1.6 m. The angle of contact on the smaller pulley in degrees is __________
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A two tonne mine car is released from the top of an incline at a height of 3 m as shown in the figure. The mine car travels 45 m along the inclined track and another 85 m along the horizontal track before coming to rest.
The specific rolling resistance of the car in N/tonne is ____________ - A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes ____________
- A core sample of a rock, having diameter 54 mm and length 108 mm, is subjected to axial loading. If the axial strain and Poisson's ratio are 2000 * 10-6 and 0.28 respectively, the value of volumetric strain , represented in micro-strain is ___________
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