Mine Ventilation MCQ Questions - Part 02 | Indian Minerology

🌬️ Mine Ventilation MCQ Questions - Part 02

16. Air Quantity (Q) in mine ventilation is given by:

• A. Q = v × A
• B. Q = p/h
• C. Q = R × L
• D. None

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Answer: A. Q = v × A (velocity × area)

17. The instrument used to measure mine air pressure is:

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

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Answer: A. Manometer

18. The main mine fans are generally installed at:

• A. Pit top (Surface)
• B. Underground face
• C. Inside gob
• D. On haulage road

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Answer: A. Pit top (Surface)

19. Which type of fan is commonly used as a main mine fan?

• A. Centrifugal Fan
• B. Propeller Fan
• C. Axial Flow Fan
• D. Roof Fan

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Answer: C. Axial Flow Fan

20. Booster fans are used for:

• A. Increasing airflow in districts
• B. Main ventilation only
• C. Cooling equipment
• D. Rescuing persons

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Answer: A. Increasing airflow in districts

21. Which law gives the relation between pressure drop and air quantity in mine airways?

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

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Answer: B. Atkinson’s Law

22. Ventilation efficiency is maximum when:

• A. Leakage is high
• B. Leakage is negligible
• C. Only blower fan used
• D. Natural ventilation only

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Answer: B. Leakage is negligible

23. Natural ventilation pressure (NVP) depends upon:

• A. Difference in temperature & height of shafts
• B. Fan power
• C. Air velocity
• D. Gob area

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Answer: A. Difference in temperature & height of shafts

24. Splitting of air in mines is done to:

• A. Divide air into parallel circuits
• B. Increase explosive risk
• C. Increase resistance
• D. Reduce fan efficiency

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Answer: A. Divide air into parallel circuits

25. In mine ventilation, “Equivalent orifice” is used to represent:

• A. Resistance of whole mine
• B. Fan efficiency
• C. Leakage
• D. Gas percentage

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Answer: A. Resistance of whole mine

26. Which of the following is used for auxiliary ventilation in headings?

• A. Centrifugal Fans with Ducts
• B. Main axial fans
• C. Booster fans only
• D. Gob wells

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Answer: A. Centrifugal Fans with Ducts

27. If current of air increases, pressure loss varies as:

• A. Directly proportional to Q
• B. ∝ Q²
• C. ∝ √Q
• D. Independent

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Answer: B. Proportional to Q²

28. Recirculation in ventilation is:

• A. Allowable always
• B. Re-use of return air at face
• C. Fresh air intake
• D. Use of booster fans

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Answer: B. Re-use of return air at face (dangerous)

29. Homotropal ventilation means:

• A. Airflow same direction as coal transport
• B. Airflow opposite to coal transport
• C. Airflow both ways
• D. No airflow

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Answer: A. Airflow same direction as coal transport

30. Antitropal ventilation means:

• A. Airflow same as coal transport
• B. Airflow opposite to coal transport
• C. Both same and opposite
• D. None

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Answer: B. Airflow opposite to coal transport

🌬️ Mine Ventilation MCQ Series

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