GATE MN 2017 Paper 1 — page 15

Questions 43–45 of 65. Imported answers require review unless explicitly marked reviewed.

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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2017 · Paper 1

Question 43

Question 44

Question 45