Mine Ventilation MCQ Questions - Part 01 | Indian Minerology

🌬️ Mine Ventilation MCQ Questions - Part 01

1. The main purpose of mine ventilation is:

• A. To cool machinery
• B. To provide fresh air and dilute gases
• C. To improve illumination
• D. To drain water

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Answer: B. To provide fresh air and dilute gases

2. Which gas is called "firedamp" in mines?

• A. Methane
• B. Carbon Monoxide
• C. Nitrogen
• D. Hydrogen

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Answer: A. Methane

3. The normal oxygen percentage in mine air should be at least:

• A. 14%
• B. 16%
• C. 19%
• D. 21%

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Answer: D. 21%

4. Blackdamp in mines is a mixture of:

• A. CO + CH4
• B. CO2 + N2 with low oxygen
• C. SO2 + O2
• D. Only nitrogen

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Answer: B. CO2 + N2 with low oxygen

5. Which unit is used to measure airflow in mines?

• A. m/s
• B. m³/s or m³/min
• C. Pascal
• D. kg/m³

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Answer: B. m³/s or m³/min

6. The statutory limit of CO in airways is:

• A. 25 ppm
• B. 50 ppm
• C. 100 ppm
• D. 200 ppm

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Answer: A. 25 ppm

7. The term "Quantity of Air" in mines refers to:

• A. Air pressure
• B. Air volume per unit time
• C. Fan speed
• D. Gas % only

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Answer: B. Air volume per unit time

8. The normal velocity of intake air in mine roadways is usually:

• A. 0.1–0.5 m/s
• B. 0.5–2.5 m/s
• C. 3–5 m/s
• D. Above 10 m/s

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Answer: B. 0.5–2.5 m/s

9. The instrument used to measure air velocity in mines is:

• A. Psychrometer
• B. Anemometer
• C. Barometer
• D. Hygrometer

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Answer: B. Anemometer

10. Methane explosive range in air is between:

• A. 1% – 5%
• B. 2% – 8%
• C. 5% – 15%
• D. 15% – 30%

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Answer: C. 5% – 15%

11. Threshold limit value (TLV) of CO2 in mine air is about:

• A. 0.25%
• B. 0.5%
• C. 1%
• D. 2%

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Answer: A. 0.25%

12. Which law governs the pressure loss due to air friction in mine airways?

• A. Boyle’s Law
• B. Dalton’s Law
• C. Atkinson’s Law
• D. Charles’ Law

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Answer: C. Atkinson’s Law

13. The main pollutant gas during spontaneous heating of coal is:

• A. Methane
• B. Carbon monoxide
• C. Hydrogen
• D. Nitrogen

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Answer: B. Carbon monoxide

14. The SI unit of mine air pressure is:

• A. Pascal (Pa)
• B. Torr
• C. bar
• D. mmHg

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Answer: A. Pascal (Pa)

15. The statutory minimum quantity of air per person in an Indian coal mine is:

• A. 2 m³/min
• B. 3.5 m³/min
• C. 6 m³/min
• D. 10 m³/min

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Answer: B. 3.5 m³/min

🌬️ Mine Ventilation MCQ Series

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