An instrument used to find relative humidity of air in mines.
A. whirling hydrometer
B. whirling hygrometer
C. kata thermometer
D. 'u' tube manomet
Answer: Option B
This Question Belongs to Mining Engineering >> Mine Ventilation
Related Questions on Mine Ventilation
The mechanical mixture of gases existing in a mine given off after explosion called
A. White damp
B. Stink damp
C. Black damp
D. After damp
A Drager Gas Mask does not filter
A. Water vapour
B. Nitrous fumes
C. Carbon monoxide
D. Carbon dioxide
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