MCQOPTIONS
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MCQOPTIONS
| 1. |
In compressed air tunneling, the volume of free air provided is______________? |
| A. | 6 mJ per second per m2 of face area |
| B. | 6 m3 per minute per m2 of face area |
| C. | 20 m3 per minute per m2 of face area |
| D. | 6 m3 per hour per m2 of face area |
| Answer» C. 20 m3 per minute per m2 of face area | |