How many Co-tubes to be kept at the surface of the mine where no rescue room is located close to the mine entrance?
A. 4
B. 6
C. 8
D. 10
Answer: Option D
A. 4
B. 6
C. 8
D. 10
Answer: Option D
Combustable oils or materials not used for filling in . . . . . . . . Equipment
A. Hydraulic
B. Chemical
C. Biological
D. Eletrical
Out of the following belt conveyor related items which one is provided for safety for the persons?
A. Loop-take-up
B. Idler set
C. Audio-visual alarm
D. sequential control switch
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