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 34–36 of 65. Imported answers require review unless explicitly marked reviewed.
Question 34
Open questionMNNAT1 markNeeds review
A coal seam of 3.0 m height is mined with a double-ended range drum shearer (DERDS) for a web depth of 0.5 m. The coal density is 1.4 tonne/m³. If the panel width is 150 m, the production per cycle in tonne is______.
[rounded off to 1 decimal place]
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Open questionMNNAT1 markNeeds review
In a panel with 50 workers, a miner typically consumes 2.5 × 10⁻³ m³/min of oxygen. The percentage of oxygen in the intake air is 20.95%. To ensure minimum permissible oxygen in the return air as per CMR 2017 the quantity of ventilation air in m³/min to be supplied to the panel is_____.
[rounded off to 2 decimal places]
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 36
Open questionMNMCQ2 marksNeeds review
In a quality control process of coal supplied to a thermal plant, the 3-sigma control limits for fixed carbon (FC) are defined by 40% ± 15%. The process is termed “out of control” if:
Rule 1: 4 out of 5 successive values of FC are situated at the same side of the mean and at a distance more than 1 standard deviation.
Rule 2: Any one value crosses any of the 3-sigma control limits.
For the following continuous data of FC (%): 49, 51, 56, 20, 46, 48, 47, 49, 45, 41, 42, 40, the process is
Your answerChoose one option.
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