GATE MN topic:mining-engineering PYQs & Answers — Page 51

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Questions 501–510 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 51 of 65

A double ended ranging drum shearer operates in a longwall retreating panel. The following data are provided:

Face length: 200 m Web depth: 0.6 m Cutting height: 2.5 m Density of coal: 1.4 tonne/m

Average cutting speed: 1.5 m/min Average flitting speed: 4.0 m/min Number of shifts/day: 3

Method of cutting is unidirectional and each shift requires a non-operational time of 2.0 hours. The production per day in tonne (rounded off to one decimal place) is

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In the linear programming problem,

Maximize

Subject to:

, and

The value of Z is

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A shovel operates 300 days in a year, 2 shifts in a day, and 4 hours in a shift to achieve the target production of 30 Million tonne per annum. The following parameters relate to the loading operation:

Bucket capacity of shovel: 15 m

Shovel cycle time: 44 s Bucket fill factor: 0.85 Bulk density of the muck: 3.00 tonne/m

The minimum number of shovels required to achieve the production is

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A set of tubs is pulled by a 15 tonne diesel locomotive at a gradient of 1 in 100 with an acceleration of 0.05 m/s

. The coefficient of adhesion between the wheel and the track is 0.2 and the frictional resistance coefficient is 0.01. The maximum mass, in tonne, the locomotive can pull (rounded off to one decimal place) is

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The characteristic curves of two mine fans installed in series in a fan drift are

and

where P is pressure in Pa and Q is quantity in m

/s. If the mine quantity is 70 m

/s, the mine resistance, in Ns

(rounded off to two decimal places) is

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Three equipment A, B, and C located side by side and operating simultaneously produce a sound power level of 77.5 dB. The sound power levels of A and B are 68 dB and 70 dB respectively. The sound power level of C (rounded off to one decimal place) in dB, is

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The main surface fan of a mine as shown in the figure, has characteristic curve approximated by

, where P is pressure in Pa and Q is quantity in m

/s. A booster fan is installed in section A such that there is no air flow in section B. The operating pressure of the main surface fan, in Pa, (rounded off to two decimal places) is

Diagram for Mining Engineering question 42

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Two points A and B are located 150 m apart in the East-West orientation on the bank of a river as shown in the figure. Considering a station C on the north bank the bearings of AC and BC are observed to be 42° and 35° respectively. The width of the river, in m, (rounded off to two decimal places) is

Diagram for Mining Engineering question 43

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, the value of

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A pump delivers 3000 liter of water in 2.0 minutes through a pipe of length 1000 m laid on a gradient of 1 in 10. The combined efficiency of pump and motor is 70%. If friction and shock losses are negligible, the input power to the motor in kW (rounded off to one decimal place) is

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GATE MN topic:mining-engineering PYQs

Question 36

Question 37

Question 38

Question 39

Question 40

Question 41

Question 42

Question 43

Question 44

Question 45