Mining Engineering
2023 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE MN 2023 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 46–48 of 65. Imported answers require review unless explicitly marked reviewed.
Question 46
Open questionMNNAT2 marksNeeds review
A continuous miner served by two shuttle cars produces 240 tonne/hr. The capacity of each shuttle car is 10 tonne. When a single shuttle car operates, the cycle time becomes 4 min. In case one of the shuttle cars is under break-down, the reduction in hourly production from that of two cars in percent is _____.
[rounded off to 1 decimal place]
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Open questionMNNAT2 marksNeeds review
A circular tunnel is developed in a biaxial in situ stress field as shown in the figure. If the ratio between tangential stress at the boundary point A and that at the boundary point B is 2.0, the value of k is _____.
[rounded off to 2 decimal places]
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Open questionMNNAT2 marksNeeds review
Strength of a rectangular coal pillar in MPa is given by
where
,
(
) and
are width, length and height of the pillar, respectively. The parameter
is constant.A 30 m square pillar is split into two halves as shown in the figure. The height of the pillar is 3 m. The ratio of safe factors between one half-pillar and the original square pillar is _____.
[rounded off to 2 decimal places]
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