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1
Extraction of coal by caving system may be permitted upto a thickness of . . . . . . . . m only.
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Answer: Option D
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2
Sub level caving should be done with
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Answer: Option B
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3
The type of boring suitable for drilling holes angle
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Answer: Option C
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4
The type of pumps generally used for dewatering of shaft sinking
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Answer: Option C
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