газохим2

<question>The intensity of the evaporation process depends on

• <variant>from the type of liquid.

• <variant>depending on the availability of ventilation

• <variant>of surface temperature

• <variant>from the free surface area

• <variant>from the value of the Archimedean force.

<question>Vaporization –

• < variant>boiling

• <variant>the process of transition of a substance from a liquid state to a solid state

• <variant>the process of transition of a substance from a gaseous state to a liquid one;

• <variant>the process of transition of a substance from a liquid state to a gaseous one;

• <variant>no correct answer

<question>Modern mass spectrometers are manufactured in

• <variant>Of Russia

• <variant>Germany

• <variant>Brazil

• <variant>In China

• <variant>Of Ethiopia

<question>Permissible methane (CH4) concentration in degassing pipelines, % (by volume).

• <variant>up to 3.5 and more than 25;

• <variant>4,5 or more than 25;

• <variant>up to 3.2 and more than 20

• <variant>all correct

• <variant>no correct answer

<question>Types of methane gas accumulation->

• <variant>ordinary, vented, sudden;

• <variant>local, layered, and full gassing of the workings.

• <variant>lower, middle, upper;

• <variant>vented, sudden;

• <variant>no correct answers

<question>Types of methane gas release->

• <variant>ordinary and local

• <variant>no correct answers

• <variant>local, layered

• <variant>ordinary, vented, sudden

• <variant>local, layered, full

<question>The temperature of the air entering the mine workings must not be lower than>

• <variant>70With

• <variant>90With

• <variant>20With

• <variant>50With

• <variant>40With

<question>The maximum permissible concentration of carbon monoxide (CO) in active mine workings is, % (by volume)

• <variant>0.00080%

• <variant>0.00030%

• variant>0.0<0040%

• <variant>0,00010%

• <variant>0,0017%

<question>The maximum permissible concentration of hydrogen (H) in the charging chambers is

• <variant>0,5%;

• <variant>0,75%;

• <variant>1%.

• <variant>2%

• <variant>1,5%

<question>The content of carbon dioxide (CO2) in the mine air in workings with the outgoing jet of the wing of the mine, the horizon and the mine as a whole should not exceed

• <variant>1,5%

• <variant>2%

• <variant>1%.

• <variant>0,5%;

• <variant>0,75%;