Mining Engineering
GATE MN purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 161–170 of 650. Imported answers require independent review unless marked reviewed.
Question 31
Open questionMNNAT1 markNeeds review
The void ratio of an unconsolidated soil heap of volume 1000 m
is 1.0. If the soil heap is consolidated to a volume of 800 m
, the corresponding void ratio is_______. (round off up to 2 decimals)Log in to check the answer
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Open questionMNNAT1 markNeeds review
For a circular path of radius 300 m, the super elevation is restricted to 0.1 m for a width of 1.6 m. The maximum speed, in m/s, of vehicle to avoid overturn is ____. (round off up to 2 decimals)
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Open questionMNNAT1 markNeeds review
A scanline survey between points A and B of a rock mass is shown. Consider
,where,
is the frequency of discontinuity per m. The RQD of the rock mass is_______. (round off up to 2 decimals)
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Open questionMNNAT1 markNeeds review
In a VCR stope, blast holes of 165 mm diameter are drilled. For the blast hole to behave as a spherical charge, the maximum charge length, in m, is_____. (round off up to 2 decimals)
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Open questionMNNAT1 markNeeds review
A rectangular development heading of dimension 3 m × 2.8 m is to be blasted with holes of 2.4 m in length. If the pull factor is 0.95 and swell factor is 1.20, the volume of blasted rock per round, in m
, is_______. (round off up to 2 decimals)Log in to check the answer
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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
Your answerChoose one option.
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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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Open questionMNMCQ2 marksNeeds review
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.
Your answerChoose one option.
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Open questionMNMCQ2 marksNeeds review
Magnitude of error in the determination of the integral, I using Simpson’s 1/3 rule, taking step length as 1.0 is
Your answerChoose one option.
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