CMSP Mine Ventilation & Atmospheric Monitoring 2

Question 1

What is the MSHA permissible exposure limit (PEL) for carbon monoxide in underground mine atmospheres?

Accepted Answer

50 ppm

Answer

25 ppm

Answer

100 ppm

Answer

200 ppm

Question 2

In the Coward's Flammability Triangle, which three gases are used to describe explosive atmospheres?

Accepted Answer

Methane (or fuel gas), oxygen, and nitrogen

Answer

Oxygen, nitrogen, and carbon dioxide

Answer

Hydrogen sulfide, methane, and carbon monoxide

Answer

Carbon monoxide, propane, and oxygen

Question 3

What does a water-gauge manometer measure in a mine ventilation survey?

Accepted Answer

The pressure differential (ventilation pressure) between two points in the mine

Answer

Temperature difference between intake and return air

Answer

The percentage of methane in the mine atmosphere

Answer

The total volume of air passing through an airway per minute

Question 4

Auxiliary ventilation in underground mining is used to:

Accepted Answer

Ventilate dead-end headings and development faces where main airflow cannot reach

Answer

Replace the main mine fan when it fails

Answer

Provide emergency breathing air in rescue operations

Answer

Reverse airflow direction during a mine fire

Question 5

Which type of ventilation system is characterized by two separate airway systems where intake and return air travel in opposite directions through parallel entries?

Accepted Answer

Antitropal ventilation

Answer

Homotropal ventilation

Answer

U-tube ventilation

Answer

Forcing ventilation

Question 6

In a flame safety lamp, what indicates the presence of flammable gas (methane) in the mine atmosphere?

Accepted Answer

The flame elongates and develops a blue cap above it

Answer

The flame turns blue and goes out

Answer

The glass darkens and becomes opaque

Answer

The flame turns red and increases in size

Question 7

What is the purpose of conducting a ventilation survey in an underground mine?

Accepted Answer

To measure airflow quantities and pressures to evaluate ventilation system efficiency and plan improvements

Answer

To identify areas where blasting operations can occur

Answer

To locate hidden ore deposits using air sampling

Answer

To determine worker exposure to noise levels in mine entries