Engine : Engineering Safety - 300/968
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| The explosive range of methane is 5% to 15% by volume in air. This means a vapor/air mixture of __________. |
| A) 3 percent methane by volume is too rich to burn |
| B) 5 percent methane by volume will give a reading of 100 percent L.E.L. on a combustible gas indicator |
| C) 10 percent methane by volume is too rich to burn |
| D) 20 percent methane by volume is too lean to burn |
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