Mining Engineering
GATE MN exam:gate PYQs
Build your understanding with focused practice from past exam papers.
Questions 101–110 of 650. Imported answers require independent review unless marked reviewed.
Question 36
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
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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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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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Based on the theodolite survey for a closed traverse PQRS, the following bearings are observed for the sides of the traverse.
Line | Fore bearing |
|---|---|
PQ | 60°30′ |
QR | 105°30′ |
RS | 220°30′ |
SP | 310°30′ |
The interior angles at P and R respectively are
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The CORRECT statement(s) of dragline operation is/are -
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A constant feed of 400 mL/s is maintained by a Xanthe column of height H as shown in the figure. The outlet cross section area is
. The acceleration due to gravity is 10 m/s². Neglecting friction and other losses, the value of H, in cm, is ____ (rounded off to 2 decimal places)
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A continuous miner serves two shuttle cars of 12 tonne capacity each. Shuttle cars I and II operate with a total cycle time of 12 minutes and 15 minutes respectively, which includes loading time of 8 minutes for each car. The production rate of the continuous miner, in tonne/hour, is ________ (rounded off to 2 decimal places)
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In a sublevel stope, a ringhole blast round is designed for winning 2500 tonne of ore with 8.0 % metal content. The blast results into breakage of 90.0 % of the design blast round. Overbreak of 250 tonne wallrock with 0.5 % metal content dilutes the blasted ore. The total metal content, in tonne, considering 95 % recovery of the blasted muck from the stope, is _______ (rounded off to 2 decimal places)
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