History of Industrial Dust Diseases
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Questions and Answers

What does the value of E represent in the context of exposure to contaminants?

  • A factor that must not exceed 1.0 (correct)
  • A measure of the maximum contamination level permissible
  • The concentration of the contaminant found in the Z tables
  • The exposure limit for the particular contaminant

    • What does the ceiling limit for a toxic substance represent?

  • Average concentration over a work shift
  • Maximum exposure allowed for any amount of time (correct)
  • Variable concentration based on exposure time
  • Minimum concentration to avoid regulatory fines

    • How is the exposure level to mixtures of contaminants determined?

  • Multiplying the concentration by the exposure limit
  • Selecting the highest concentration as the exposure limit
  • Dividing the concentration by the exposure limit
  • Adding the exposure limits of the individual contaminants (correct)

    • What does 8-hr TWA PEL stand for in the context of exposure to contaminants?

    <p>Time-Weighted Average Permissible Exposure Limit</p> Signup and view all the answers

    When using the formula for mixtures of contaminants, what does a result like 0.925 imply?

    <p>The exposure is below the regulatory limit</p> Signup and view all the answers

    What is the purpose of Table Z-2 in determining exposure to contaminants with ceiling values?

    <p>To calculate the exposure based on substances listed</p> Signup and view all the answers

    What does 1910.1000(b)(1) specify about employee exposure to substances listed in Table Z-2?

    <p>Daily exposure should not exceed the 8-hour limit</p> Signup and view all the answers

    What does the 8-hour time weighted average limit in Table Z-2 define?

    <p>8-hour average for each exposure to contaminants</p> Signup and view all the answers

    Why do ceiling limits manifest differences from other standardized exposure limits?

    <p>Ceiling limits do not vary with exposure time</p> Signup and view all the answers

    What does the formula (500/1,000 + 45/200 + 40/200) = 0.925 indicate about the exposure levels?

    <p>The exposure level being within acceptable limits</p> Signup and view all the answers

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