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31
Under ground gassification, development done towards
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Answer: Option A
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32
Cable drilling employed commonly employed for holes deeper than
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Answer: Option A
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33
In drilled shafts all the sinking work can be carried out by
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Answer: Option A
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34
Continuous record of bore hole deviation from top to bottom by an instrument by
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Answer: Option A
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35
While driving slices, what should be the minimum thickness of rib of coal to be left against adjacent goaf.
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Answer: Option A
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36
Pumps are employed when the make of water in the shaft exceed
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Answer: Option C
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37
Common rate of sand stowing in μ/g mines is A tons of sand per hour. Value of A is given by . . . . . . . .
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Answer: Option A
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38
The number of panels to be opened at a time decided by
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Answer: Option C
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39
Water infusion of coal face in ploughing causes.
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Answer: Option D
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40
With AFC the length of single unit face commonly
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Answer: Option B
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