In order to estimate the NVP in a mine, measurements are made at the main fan as shown below.
| Fan speed (RPM) | Fan drift pressure (Pa) | Fan quantity (m3/s) |
| 800 | 655 | 82.2 |
| 950 | 730 | 85.5 |
A. 156.84
B. 256.84
C. 236.84
D. 246.84
Answer: Option B
This Question Belongs to Mining Engineering >> Mine Ventilation
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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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