GATE MN year:2019 PYQs & Answers — Page 6 — Exam Papers

Questions 51–60 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 6 of 7

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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If

, the value of

is

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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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A sand water slurry of specific gravity 1.45 contains sand of grain density 2.6 g/cc. The weight percent of sand in the slurry (rounded off to two decimal places) is

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For a mining company the unit transportation cost from a mine to a washery, and supply and demand are shown below:

		Washery			Supply
Mine		A	B	C	D
M1		30	0	40	20	500
M2		24	16	22	40	700
M3		0	32	28	36	800
Demand		300	400	600	700

The total cost of transportation using the Vogel’s approximation method is

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In a bord and pillar panel, 6 square pillars are developed as shown in the figure below. The depth of the seam is 300 m and the average unit weight of overburden rock is 25 kN/m

. If the pillar strength is 15 MPa, the safety factor of the shaded pillar zone (round off to two decimal places) is

Diagram for Mining Engineering question 48

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Water enters a sump having the shape of an inverted frustum at a rate of 500 m

/h. The sump is initially filled up to 2.0 m height. The time taken in days to fill the remaining part of the sump (rounded off to one decimal places) is

Diagram for Mining Engineering question 49

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The uniaxial stress-strain behavior of a rock sample is shown in the figure.

Diagram for Mining Engineering question 50

The elastic modulus E is 20,000 MPa. If

is the plastic strain, the value of the damage parameter D (rounded off to two decimal place) is _____.

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