GATE MN topic:mineral-processing PYQs & Answers — Page 63

Questions 621–630 of 650. Imported answers require independent review unless marked reviewed.

The series-parallel configuration of a system, consisting of 6 independent components A, B, C, D, E, and F with their individual reliability, is shown in the figure:

Diagram for Mining Engineering question 36

The reliability of the system is

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500 coal miners were randomly selected from an underground coal mine. It was found that 50 workers experienced an injury in the year 2014. The distribution of injury based on younger age group (age ≤ 40 years) and older age group (age > 40 years) generated the following cross classification table.

| Age group | Injured | Non-injured | Row total | | Younger age group | 20 | 130 | 150 | | Older age group | 30 | 320 | 350 | | Column total | 50 | 450 | 500 |

The odds of injury for the younger age group compared to the older age group is

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A bord and pillar panel is being planned at a depth of 300 m. The dimension of square pillar is 35 m centre-to-centre. The average unit weight of the overburden rock is 25 kN/m³. If the strength of the pillar is 14.0 MPa, the gallery width in m for a safety factor of 1.3 is

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A sandstone sample having 15% moisture content and volume of 75 cm³ weighs 180 g. If the grain density is 2.6 g/cm³, porosity of the sample in % is

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Let

and

are major and minor principal stresses respectively. The equation

denotes the failure envelop of a rock as shown in the figure. Match the zones (P, Q, R and S) with the legend code.

Code	Name
1.	Safe zone
2.	Tensile zone
3.	Infeasible zone
4.	Unsafe zone

Diagram for Mining Engineering question 40

Your answerChoose one option.

P-1, Q-2, R-4, S-3

P-3, Q-1, R-4, S-2

P-3, Q-1, R-2, S-4

P-1, Q-4, R-3, S-2

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A blasted muck of mass

is being lifted from a shaft of diameter

by an arrangement of two pulleys as shown in the figure. Ignoring friction in the pulleys, as the height

decreases, tension in the ropes

Diagram for Mining Engineering question 41

Your answerChoose one option.

increases

decreases

remains constant

increases until

, then decreases

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The longitudinal section of a stope is given in the figure. Match the different labeled stope features (P, Q, R, S, and T) with their corresponding nomenclatures.

Code	Name
1	Box hole
2	Raise
3	Crown Pillar
4	Access drift
5	Rib Pillar

Diagram for Mining Engineering question 42

Your answerChoose one option.

P-2, Q-3, R-1, S-5, T-4

P-5, Q-1, R-2, S-3, T-4

P-3, Q-5, R-4, S-2, T-1

P-1, Q-5, R-3, S-4, T-2

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To break a volume of 30000 cubic meter of overburden per month in an open cast mine, the number of blast hole drills required for the following data is ________

Spacing and burden of blast holes: 6.0 m x 4.0 m Hours scheduled per shift: 5 Number of shifts per day: 2 Weeks per month: 4 Drilling days per week: 5 Drilling rate: 30.67 m/h

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Two inclined coal seams with their accesses are shown in the figure. Match the labeled accesses (P, Q, R, S) with their corresponding names.

Code/Name:

Code	Name
1	Horizon
2	Adit
3	Inclined shaft
4	Incline

Diagram for Mining Engineering question 44

Your answerChoose one option.

P-4, Q-3, R-1, S-2

P-4, Q-3, R-2, S-1

P-3, Q-4, S-2, R-1

P-3, Q-4, R-2, S-1

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Ground reaction curve (GRC) of a tunnel roof under hydrostatic stress field is given by

, where

is the required support pressure in MPa and

is radial displacement in m. A uniform support is installed at the boundary of the tunnel providing support reaction (SR) as

, for

m. Considering GRC = SR, the support pressure in MPa is ________

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GATE MN topic:mineral-processing PYQs

Question 36

Question 37

Question 38

Question 39

Question 40

Question 41

Question 42

Question 43

Question 44

Question 45