GATE MN year:2017 PYQs & Answers — Page 5

Questions 41–50 of 65. Imported answers require independent review unless marked reviewed.

A blasted muck of mass

is being lifted from a shaft of diameter

by an arrangement of two pulleys as shown in the figure. Ignoring friction in the pulleys, as the height

decreases, tension in the ropes

Diagram for Mining Engineering question 41

Your answerChoose one option.

increases

decreases

remains constant

increases until

, then decreases

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The longitudinal section of a stope is given in the figure. Match the different labeled stope features (P, Q, R, S, and T) with their corresponding nomenclatures.

Code	Name
1	Box hole
2	Raise
3	Crown Pillar
4	Access drift
5	Rib Pillar

Diagram for Mining Engineering question 42

Your answerChoose one option.

P-2, Q-3, R-1, S-5, T-4

P-5, Q-1, R-2, S-3, T-4

P-3, Q-5, R-4, S-2, T-1

P-1, Q-5, R-3, S-4, T-2

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To break a volume of 30000 cubic meter of overburden per month in an open cast mine, the number of blast hole drills required for the following data is ________

Spacing and burden of blast holes: 6.0 m x 4.0 m Hours scheduled per shift: 5 Number of shifts per day: 2 Weeks per month: 4 Drilling days per week: 5 Drilling rate: 30.67 m/h

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Two inclined coal seams with their accesses are shown in the figure. Match the labeled accesses (P, Q, R, S) with their corresponding names.

Code/Name:

Code	Name
1	Horizon
2	Adit
3	Inclined shaft
4	Incline

Diagram for Mining Engineering question 44

Your answerChoose one option.

P-4, Q-3, R-1, S-2

P-4, Q-3, R-2, S-1

P-3, Q-4, S-2, R-1

P-3, Q-4, R-2, S-1

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Ground reaction curve (GRC) of a tunnel roof under hydrostatic stress field is given by

, where

is the required support pressure in MPa and

is radial displacement in m. A uniform support is installed at the boundary of the tunnel providing support reaction (SR) as

, for

m. Considering GRC = SR, the support pressure in MPa is ________

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If the rank of the following matrix is less than 3, the values of

are

Your answerChoose one option.

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The discharge rate of a water pump is 0.25 m³/s. The diameter of the discharge and suction nozzles are 300 and 350 mm respectively. The measured pressure at the discharge end located 0.25 m above the center line of the impeller is 150 kN/m² and the pressure at the suction gage located at the centre line of the impeller is 20 kN/m². Specific weight of water is 9810 N/m³. The total dynamic head for the above installation in m is ________

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In a mine, 200 and 250 persons are deployed in the Panels A and B (shown in figure) respectively in the largest shift.

Diagram for Mining Engineering question 48

The panels produce 400 and 500 tonne/day respectively. The resistances of panels A and B are 0.3 Ns²m⁻⁸ and 0.4 Ns²m⁻⁸ respectively and the combined resistance of shaft and trunk airways is 0.5 Ns²m⁻⁸. The operating static pressure of the fan in Pa to provide the minimum air quantities in the panels as per CMR 1957 is ________

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In an auxiliary ventilation system, a fan is installed inside a 100 m long and 600 mm diameter duct to ventilate a blind heading face. The frictional coefficient of the duct is 0.0066 Ns²m⁻⁴ and the static pressure characteristic of the fan is represented by:

where,

is in Pa and Q is in m³/s. The quantity of air delivered by the fan in m³/s is ________

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A stream flowing at 15 m³/s has a tributary feeding into it with a flow rate of 7 m³/s. The concentrations of chloride at the upstream of the junction and that of the tributary are 30 mg/L, and 50 mg/L respectively. Treating chloride as conservative substance and assuming complete mixing of two streams, the concentration of chloride in mg/L at the downstream is ________

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GATE MN year:2017 PYQs

Question 41

Question 42

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 49

Question 50