GATE MN · 2023 · MN
Question 36: Mine Planning
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Question 36
MNMCQ2 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
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2023MN
GATE MN 2023 · Paper 1
Mining Engineering · Original paper archive
- Section
- Mining Engineering
- Question type
- Multiple choice (MCQ)
- Marks
- 2 marks
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