GATE MN topic:mining-engineering PYQs & Answers — Page 6

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Questions 51–60 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 6 of 65

An economic block model along with extraction sequence is shown. The numbers given at the centre of the block represent the year of extraction, and that at the corners represent the block economic value in ₹ (lakhs). If the discount rate is 10%, the net present value (NPV), in lakhs, is ₹ __________. (rounded off to two decimal place)

Diagram for Mining Engineering question 51

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A main mechanical ventilator installed for an underground mine develops a pressure of 25 mm wg. A natural ventilation pressure (NVP) of 15 mm wg acting in the mine aids the ventilator, and a total 500 m

min

of air is circulated in the mine. Considering the same NVP aiding the ventilator, the pressure required, in mm wg, to be generated by the ventilator to circulate 1000 m

min

of air, is ____________. (answer in integer)

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Dust particles from a blasting operation rise up in the atmosphere to a height of 500 m. The viscosity of air is 1.80 × 10

kg m

. Assume the particles have quiescent settling (no turbulence) in atmosphere. Neglecting air density, the settling time, in days, of a dust particle of 2.5 μm diameter and 3600 kg m

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

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In a biochemical oxygen demand (BOD) test, 15 ml of wastewater sample was diluted with distilled water to completely fill a 300 ml BOD bottle and incubated at 20 °C for 5 days. The dissolved oxygen (DO) level before and after incubation are 9.2 mg liter

and 4.4 mg liter

, respectively. The BOD of the sample, in mg liter

, is ____________. (answer in integer)

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A rake of wagons, with inter-wagon gap of 100 cm, is moving at a speed of 0.4 km per hour under a silo loading system. The dimensions of the wagon are 8 m (L) × 3 m (W) × 3 m (H). The silo stops discharging the material between the wagons. Considering the fill factor of the wagon as 0.95 and the bulk density of coal as 1.2 tonne per cubic meter, the loading rate of the silo, in tonne per hour, is ____________. (rounded off to nearest integer)

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A turbine pump is designed to generate water head of 60 m. The impeller speed of the pump is 2000 rpm and the manometric efficiency is 70%. Neglecting the impeller blade curvature, the impeller diameter of the pump, in cm, is _____________. (rounded off to two decimal places)

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The information for a dragline operation is given:

Bucket capacity: 20 m

Bucket fill factor: 0.9

Digging and filling time: 20 s

Swinging (to and fro) time: 32 s

Dumping time: 10 s

Dragline utilization: 90%

The output of the dragline, in m

, is ________. (rounded off to one decimal place)

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In a bench blasting, as shown, 49 kg of explosive is put in each hole. The detonation time of holes, in millisecond, and the associated scale distance (SD) vs. peak particle velocity (PPV) plot for the given blast pattern is shown. The PPV at a distance of 100 m, in mm s

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

Diagram for Mining Engineering question 58

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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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GATE MN topic:mining-engineering PYQs

Question 51

Question 52

Question 53

Question 54

Question 55

Question 56

Question 57

Question 58

Question 59

Question 60