Mine Foreman Exam Instruments And Apparatus (Anemometer)

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  • 1/10 Questions

    How are air velocities determined by an anemometer?

    • By the linear feet of air travel
    • It's recorded on dials
    • By lineal feet of air travel as recorded on the dials
    • An anemometer does not determine air velocity
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About This Quiz

This quiz focuses on the use of anemometers in mine foreman exams, assessing knowledge on air velocity measurements, usage in mine environments, and calculations related to air flow in specified dimensions. Essential for those in mining safety and engineering roles.

Mine Foreman Exam Instruments And Apparatus (Anemometer) - Quiz

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  • 2. 

    What period of time is usually taken for measuring air velocities?

    • For 30 seconds

    • For one minute

    • For two minutes

    • For 150seconds

    Correct Answer
    A. For one minute
    Explanation
    Air velocities are typically measured over a period of one minute. This duration allows for a sufficient amount of time to accurately capture and average the velocity of the air. It provides a representative measurement of the air movement within a given space or environment.

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  • 3. 

    What is an anemometer?

    • A large measuring instrument

    • An instrument that resembles a disk fan

    • An instrument that measures lineal feet in air travel

    • Both A & B

    • Both B & C

    • Both C & A

    Correct Answer
    A. Both B & C
    Explanation
    An anemometer is an instrument that measures lineal feet in air travel and resembles a disk fan. This means that it can measure the distance traveled by air as well as have a physical appearance similar to a fan with a disk shape.

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  • 4. 

    How is an anemometer used to obtain velocities in mines?

    • It is held in the air current

    • It is laid on the ground for a certain amount of time to determine lineal feet of air passing each minute

    • It is held in an air current for a given period of time to determine lineal feet of air passing each minute

    • It just need to be turned on laid flat

    Correct Answer
    A. It is held in an air current for a given period of time to determine lineal feet of air passing each minute
    Explanation
    An anemometer is used to measure the velocity of air currents. In mines, it is held in an air current for a specific duration to determine the lineal feet of air passing each minute. By measuring the distance the air travels within a set time frame, the anemometer can calculate the velocity of the air current. This information is crucial for assessing ventilation and air quality in mines.

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  • 5. 

    What is meant by CFM?

    • Cubed foot per microsecond

    • Cubic foot per moment

    • Cubic feet per minute

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    Correct Answer
    A. Cubic feet per minute
    Explanation
    CFM stands for Cubic Feet per Minute. It is a unit of measurement used to quantify the volume of airflow in a given time. This measurement is commonly used in various industries, such as HVAC (Heating, Ventilation, and Air Conditioning) systems, to determine the efficiency and capacity of air circulation.

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  • 6. 

    What shall be done prior to taking an air velocity reading?

    • All dials shall be set to zero

    • All dials shall be set to one

    • All dials shall be set to 0.5

    • You just have to note which number each dial is on before reading

    Correct Answer
    A. All dials shall be set to zero
    Explanation
    Prior to taking an air velocity reading, it is necessary to set all dials to zero. This ensures that there is no initial reading or measurement on the dials that could affect the accuracy of the air velocity reading. By setting all dials to zero, any previous measurements or readings are reset, allowing for a fresh and accurate reading to be taken.

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  • 7. 

    What is the cross sectional area of an entry 4 feet high and 10 feet wide?

    • 10 square feet

    • 20 square feet

    • 40 square feet

    • 80 square feet

    Correct Answer
    A. 40 square feet
    Explanation
    The cross-sectional area of a shape is calculated by multiplying its height by its width. In this case, the entry is 4 feet high and 10 feet wide. Therefore, the cross-sectional area is 4 feet multiplied by 10 feet, which equals 40 square feet.

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  • 8. 

    How is the cross-sectional area of an entry determines?

    • Entry height plus entry width

    • Entry width divided by entry height

    • Entry height minus entry width

    • Entry height multiplied by entry width

    Correct Answer
    A. Entry height multiplied by entry width
    Explanation
    The cross-sectional area of an entry is determined by multiplying the entry height by the entry width. This is because the cross-sectional area of an object is calculated by multiplying the dimensions that define the shape of the object. In this case, the entry height and entry width are the dimensions that determine the shape of the entry, and multiplying them together gives the cross-sectional area.

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  • 9. 

    What is the quantity of air moving through an airway five feet high and twelve feet wide and the anemometer reading is five hundred CFM.

    • 20, 000

    • 22, 000

    • The formula is highXwideXreading=CFM

    • 30,000

    • Both A &C

    • Both C&D

    Correct Answer
    A. Both C&D
    Explanation
    The correct answer is Both C&D. The formula given in option C (highXwideXreading=CFM) is incorrect as it does not accurately calculate the quantity of air moving through the airway. Therefore, option C is incorrect. Option D (30,000) is also incorrect as it is not a valid calculation based on the given information. Thus, the correct explanation is that neither option C nor option D provides the correct quantity of air moving through the airway.

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  • 10. 

    What is the cross sectional area of an entry 6 1/2 feet high and 20 feet wide?

    • 115 square feet

    • 120 square feet

    • 125 square feet

    • 130 square feet

    Correct Answer
    A. 130 square feet
    Explanation
    The cross-sectional area of a rectangular entry can be calculated by multiplying its height by its width. In this case, the entry is 6 1/2 feet high and 20 feet wide. To find the cross-sectional area, we convert the height to a decimal by adding 1/2 to 6, resulting in 6.5 feet. Then, we multiply 6.5 by 20, which equals 130 square feet.

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  • Current Version
  • Oct 12, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 05, 2012
    Quiz Created by
    Leonardandsarah
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