Mining Engineering
GATE MN format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 91–100 of 348. Imported answers require independent review unless marked reviewed.
Question 23
Open questionMNMCQ1 markNeeds review
The ore that is NOT used for commercial extraction of metal is
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The function of District Mineral Foundation established by state governments in India, is to
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The percentage Fe and corresponding net value for an iron ore mine is given below:
Fe (%) | Net value (INR per tonne) |
|---|---|
58 | 4000 |
62 | 4500 |
Assuming net value versus grade curve to be a straight line, and mining cost of waste is INR 1000 /m
, the correct representation of stripping ratio, SR (m
/tonne versus Fe (%) grade curve isYour answerChoose one option.
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The magnitude of the curl of the vector
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Open questionMNMCQ2 marksNeeds review
Data from two production faces of an open pit iron ore mine are given.
Item description | Face 1 | Face 2 |
|---|---|---|
Maximum production capacity (tonne/day) | 1600 | 2000 |
Fe (%) | 63 | 58 |
Production cost of ores (in INR/tonne) | 1500 | 1200 |
Ores from two different faces are blended and supplied with Fe grade not less than 60 %. Based on the demand, the combined production is limited to a maximum of 2500 tonne/day. If the selling price of blended iron ores is INR 4500 /tonne, the optimal production from two faces in tonne/day, for maximizing the profit, respectively are
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Open questionMNMCQ2 marksNeeds review
Four identical districts of a mine are ventilated with a quantity of 350 m
/min at a fan drift pressure of 1.15 kPa. When one of the districts is sealed off, the change in resultant resistance is 0.072 Ns
m
. If the fan is stopped, keeping a district sealed, the quantity through the mine becomes 850 m
/min. The natural ventilation pressure in Pa, isYour answerChoose one option.
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Matrix
, and
, then B isYour answerChoose one option.
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Open questionMNMCQ2 marksNeeds review
The roof convergence data for 30 days at a monitoring station in a coal mine gallery is given.
Day | Convergence reading (mm) |
|---|---|
0 | 0 |
5 | 4.7 |
10 | 11.3 |
16 | 19.6 |
22 | 28.8 |
30 | 34.8 |
The management decides on a Trigger Action Response Plan (TARP) if the following two premises occur simultaneously.
Premise 1: Rate of convergence exceeds 1.5 mm/day between two consecutive measurements.
Premise 2: Rate of cumulative increase in convergence exceeds 1.0 mm/day.
Identify the day on which TARP is enforced in that gallery.
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Magnitude of error in the determination of the integral, I using Simpson’s 1/3 rule, taking step length as 1.0 is
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In a closed traverse, ABC, the bearings of two lines AB and BC are given.
Line | Length (m) | Bearing |
|---|---|---|
AB | 100 | 90° |
BC | 120 | 150° |
The length, in m and bearing of line CA, in degree, respectively, are
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