Mining Engineering
GATE MN year:2025 PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 65. Imported answers require independent review unless marked reviewed.
Question 31
Open questionMNNAT1 markNeeds review
The unadjusted RMR of a tunnel roof is 64. A single joint set exists in the roof as shown in the figure.
Using the abridged RMR table for adjustment orientation, the RMR is _____ (in integer)
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Open questionMNNAT1 markNeeds review
In a ventilation network, three airways with resistances of 4.0 Ns
m
, 6.25 Ns
m
and 9.0 Ns
m
are connected in parallel. The equivalent resistance of the network in Ns
m
is_____ (rounded off to 2 decimal places)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 33
Open questionMNNAT1 markNeeds review
In a bord and pillar panel, the following data are obtained
Number of blasting rounds per shift : 8
Face dimension (m × m) : 4.2 × 2.5
Average pull (m) : 1.2
Specific gravity of coal : 1.4
Manpower per shift : 100
The OMS (output per manshift) of the panel, in tonne, is _____ (rounded off to 2 decimal places)
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Open questionMNNAT1 markNeeds review
If the in-situ density of coal is 1320 kg/m
and the density of blasted coal is 952 kg/m
, the swell factor is_____ (rounded off to 3 decimal places)Log in to check the answer
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Open questionMNNAT1 markNeeds review
The relevant information on metal extraction from a copper mine are given below
Selling price of copper (Rs./kg) = 900
Mining cost (Rs./tonne of ore) = 500
Processing cost (Rs./tonne of ore) = 2000
Overall recovery of copper metal (%) = 70
Ignoring all other costs, the breakeven cutof grade of copper, in %, is _____ (rounded off to 2 decimal places)
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Open questionMNMCQ2 marksNeeds review
Match the type of deposit with the corresponding process of formation
Deposit type | Process of formation
P. Hydrothermal deposit | I. Alteration arising in rocks due to hot igneous solutions
Q. Metasomatic deposit | II. Leaching away of soluble minerals leaving behind valuable minerals at or near the surface
R. Placer deposit | III. Formed from highly fluid solution of magma
S. Lateritic deposit | IV. Transported and subsequent concentration of broken materials from parent rock
Your answerChoose one option.
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Open questionMNMCQ2 marksNeeds review
Following information are given for three mines of a company receiving explosives from three suppliers.
Explosive suppliers | Mine-1 | Mine-2 | Mine-3 | Supply capacity (tonne) |
|---|---|---|---|---|
Supplier - S | 10 | 15 | 50 | 2500 |
Supplier - O | 5 | 2 | 100 | 2500 |
Supplier - I | 30 | 40 | 20 | 3000 |
Explosive demand (tonne) | 1000 | 2000 | 500 | |
Considering the initial basic feasible solution of this transportation problem, using North-West corner method, the transportation cost of explosives supplied to the company, in Rs., is
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Open questionMNMCQ2 marksNeeds review
A triaxial test on a sandstone sample is conducted at a confining pressure of 10 MPa. The elastic axial and volumetric strains at axial stress of 50 MPa are recorded to be
and
respectively. The modulus of elasticity, in GPa, and Poisson’s ratio of the sample, respectively are close toYour answerChoose one option.
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Open questionMNMCQ2 marksNeeds review
A ground reaction curve (GRC) of a 3 m radius unlined circular tunnel is shown in the figure. The tunnel is supported by 300 mm thick shotcrete lining. The uniaxial compressive strength (
), modulus of elasticity (
) and Poisson’s ratio (
) of shotcrete material are 20 MPa, 15 GPa and 0.25 respectively. The maximum capacity (
) of the lining and its stiffness (
) are given as
where
= radius of the unlined tunnel and
= thickness of the lining.If the lining is constructed after 5 mm radial deformation, the support reaction is best represented by the line
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Open questionMNMCQ2 marksNeeds review
A fixed quantity of air needs to be sent through a cross section, as shown in the figure. The perimeter of the cross section is 20 m. The radius (r) of the semicircle, in m, to minimize the air velocity through the section is
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