GATE Mining Engineering - GATE 2017-2018 Questions and Answers

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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 ____________

654 to 656

335 to 337

267 to 269

483 to 485

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