In a gassy mine of 2nd & 3rd degree the average...

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In a gassy mine of 2^nd & 3^rd degree the average monthly output of which exceeds 'A' tonnes, the Manager shall be assisted by a Ventilation Officer. 'A' is given by,

A. 1000 t

B. 2500 t

C. 5000 t

D. 7500 t

Answer: Option B

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