Mining Engineering
GATE MN discipline:mining-engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 441–450 of 650. Imported answers require independent review unless marked reviewed.
Question 41
Open questionMNNAT2 marksNeeds review
An underground copper mine sends 250 tonnes of ore per day to the concentrator plant having an average grade of 1.2% Cu. The plant produces concentrate of 25.0% Cu with a recovery of 93.0%. The solids portion of tailings generated from the plant per day in tonnes is ________ (round off to 1 decimal place).
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Open questionMNNAT2 marksNeeds review
A mine gallery is supported by regularly placed roof bolts of 100 kN allowable pull force per bolt, as shown below. Assuming unit weight of the immediate roof is 25 kN/m
, the factor of safety of the support system is ________ (round off to 2 decimal places).
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The slip circle of radius 30.0 m in an overburden slope is shown with the centre of slip circle at point O. The tension crack is completely filled with water. For one meter width of the slope, the moment exerted by the force of water about O in kN-m is ________ (round off to 1 decimal place).
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Open questionMNNAT2 marksNeeds review
The function values at four points of
are shown in the table. The area under the function, using trapezoidal method, is ________ (round off to 1 decimal place). | 2 | 4 | 8 | 9 |
|---|---|---|---|---|
| 8 | 12 | 9 | 10 |
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A particle starting from rest moves in a straight line such that after time
(seconds), the acceleration becomes
cm/s
. When the acceleration becomes zero, the velocity of the particle in cm/s is ________ (round off to 1 decimal place).Log in to check the answer
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Open questionMNNAT2 marksNeeds review
A parallelepiped has edge vectors as shown below.
The volume of the parallelepiped is ________ (round off to 1 decimal place).
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For a development heading, the blasting parameters are
Cross-section: 6.0 m × 5.0 m
Total number of holes: 72
Number of trimmer holes: 30
Depth of each hole: 3.5 m
Charge per hole (except trimmers): 3.5 kg
Charge per trimmer hole: 1.8 kg
Pull per round: 90% of hole depth
The powder factor for the development round in m
/kg is ________ (round off to 2 decimal places).Log in to check the answer
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Open questionMNNAT2 marksNeeds review
The following figure represents the observations from the level survey of an underground gallery.
If the reduced level of station A is 100.0 m, the reduced level of station D in m is ________ (round off to 1 decimal place).
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Open questionMNNAT2 marksNeeds review
A tacheometer was set up at station P and the following readings were taken at two stations A and B with the staff held vertical and the line of sight horizontal.
Line | Bearing | Staff intercept |
|---|---|---|
PA | 210° | 1.2 m |
PB | 135° | 1.4 m |
The additive and multiplying constants of the tacheometer are 0 and 100, respectively. The length of AB in m is ________ (round off to 1 decimal place).
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Open questionMNNAT2 marksNeeds review
The geometry of a simple planar curve (ADB) is shown below. The value of the mid-ordinate of the curve in m is ________ (round off to 1 decimal place).
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