Q411
If the gas emission in a mine is very high as may some. times occur in very deep mines, it is a safe practice to substitute electric power supply by . . . . . . . .
A.
Steam power
B.
Compressed air
AnswerC.
Hydraulic
D.
All of these
Answer: Option B
Solution
Answer: Option B
No explanation is given for this question Let's Discuss on Board