GATE MN topic:mining PYQs & Answers — Page 64

Questions 631–640 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 64 of 65

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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A sample of mine water has 100 mg/L of

and 10 mg/L of

. The equivalent weights of

and

are 20 mg/meq and 12.2 mg/meq respectively. The hardness of mine water in unit of mg/L as CaCO₃ is ________

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A 1.1 m wide belt conveyor carries materials of bulk density 1.35 t/m³ at a speed of 1.75 m/s. The average cross-sectional area of material is equal to

, where w is the width of the belt in m. The carrying capacity of the conveyor in t/h is ________

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In a book of 600 pages, there are 60 typographical errors. Assuming Poisson distribution for the number of errors per page, the probability of no errors in randomly chosen 4 pages is ________

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Match the special methods of shaft sinking with rock mass conditions and scope of application.

Your answerChoose one option.

A-S-3, B-R-2, C-Q-1, D-P-4

A-P-2, B-Q-1, C-S-4, D-R-3

A-R-3, B-P-1, C-S-2, D-Q-4

A-S-4, B-Q-1, C-P-2, D-R-3

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A wheel of radius 0.5 m rotates under a moment of 2000 N-m as shown in the figure. A block brake is used to stop the wheel.

Diagram for Mining Engineering question 55

If the coefficient of static friction between the wheel and the block brake is 0.3, the smallest force of P in N required to stop the wheel is ________

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GATE MN topic:mining PYQs

Question 46

Question 47

Question 48

Question 49

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55