Mine Dust PreventionTest Example  

 

一、Terminologies

1 Mine Dust  

 

二、Blanks 

1 All exhaust systems, whether simple or complex, have in common the use of________, ________, and __________and __________ that leads to __________.

三、Explanations

1. List the mine dust hazards?

四、Calculations 

1. For Coal mining operations, If a dust sample contains 25% quartz, what would be the regulation standard for the dust?

五、Essay questions

1 The longwall mining is the most widely used mining method. Please make a statement of coal dust control in a longwall mining working face.

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