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81
Dustyness of a place may be considered at dust content less than . . . . . . . . the air is not dusty as per Russian text book.
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Answer: Option A
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82
The flame safety lamp is safe as long as it is not allowed to get unduly . . . . . . . .
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Answer: Option D
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83
If the mines are said to be extremly dusty, if the dust content.
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Answer: Option B
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84
The interval of bore holes should not be more than . . . . . . . . while working near water lodged workings.
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Answer: Option B
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