Chemical detector tubes which are sealed at both ends can be stored for . . . . . . . . years.
A. 3 - 4
B. 5 - 6
C. 7 - 8
D. 1 - 2
Answer: Option D
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
Join The Discussion