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41
In case of an opencast blasting the danger zone comprises of area within the radius of
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Answer: Option C
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42
Load cell and convergence recorder is used
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Answer: Option B
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43
Vertical or steeply inclined openings is suitable for
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Answer: Option A
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44
Bhaska & Tipong method was practiced in
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Answer: Option B
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45
The parting left between any two seams or sections lying within 9 m of each other shall not be less than Am thickness at any place. A is given by
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Answer: Option D
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46
Adit is adopted for
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Answer: Option B
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47
At every below ground mine where more than A Persons are ordinarily employed belowground and there is no rescue station within its radius of 35 Km, the Owner shall establish a rescue room near the mine entrance. Ais given by
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Answer: Option D
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48
High production rates coupled with large scale and extensive subsidence results from the method of
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Answer: Option B
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49
Where any person is allowed to work or pass while the haulage is in motion, manholes for refuge shall be provided at intervals of not more than
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Answer: Option B
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50
Broken rock of 3684 m3 volume is heaped into a square pyramid of height 12 m. The surface area in m2 required is
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Answer: Option A
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