CMSP Mine Ventilation & Atmospheric Monitoring

Question 1

According to MSHA regulations (30 CFR 75.323), at what methane concentration must all miners be withdrawn from an underground coal mine working section?

Accepted Answer

2.0%

Answer

At 2.0% methane, all miners must be withdrawn from the affected area; at 1.0% production stops, and at 1.5% all but those correcting the hazard must withdraw.

Question 2

What is 'blackdamp' as encountered in underground mining?

Accepted Answer

A mixture of carbon dioxide and nitrogen that displaces oxygen

Answer

Blackdamp is a mixture primarily of CO2 and N2 that displaces oxygen and can cause asphyxiation; it is heavier than air and tends to accumulate in low areas.

Question 3

Which instrument is most commonly used to measure air velocity in underground mine airways?

Accepted Answer

Vane anemometer

Answer

A vane anemometer measures airflow velocity by using rotating vanes; it is the standard tool for ventilation surveys in mine airways.

Question 4

What is the minimum required oxygen percentage in the atmosphere of an underground metal/nonmetal mine according to MSHA (30 CFR 57.5005)?

Accepted Answer

19.5%

Answer

MSHA requires a minimum of 19.5% oxygen in underground mine atmospheres; below this level, the atmosphere is considered oxygen-deficient.

Question 5

What is the primary function of a main mine fan installed on the surface?

Accepted Answer

Circulating air throughout the entire mine to dilute and remove contaminants

Answer

The main mine fan creates the pressure differential that drives fresh air through the entire mine ventilation circuit, diluting and removing methane, dust, and other hazardous contaminants.

(CMSP) Certified Mine Safety Professional Practice Test

(CMSP) Certified Mine Safety Professional Practice Test

CMSP Mine Ventilation & Atmospheric Monitoring