Mining Engineering
2025 · Paper 1
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Complete GATE MN 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 37–39 of 65. Imported answers require review unless explicitly marked reviewed.
Question 37
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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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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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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