Particle Size Analysis ASTM D422

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Particle Size Analysis ASTM D422 - Quiz

Particle Size Analysis ASTM D422


Questions and Answers
  • 1. 

    The sedimentation cylinder shall be what capacity?

    • A.

      1000 ml

    • B.

      500 ml

    • C.

      100 ml

    Correct Answer
    A. 1000 ml
    Explanation
    The sedimentation cylinder should have a capacity of 1000 ml. This is because a larger capacity allows for a larger sample size to be tested, providing a more accurate representation of the sedimentation process. Additionally, a larger cylinder allows for more precise measurements to be taken, reducing the margin of error in the experiment. Therefore, a 1000 ml capacity is ideal for sedimentation testing.

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  • 2. 

    The thermometer used for ASTM D422 shall be readable to what?

    • A.

      0.1 c

    • B.

      0.5 c

    • C.

      1 c

    Correct Answer
    B. 0.5 c
    Explanation
    The thermometer used for ASTM D422 shall be readable to 0.5 c. This means that the thermometer should have markings or divisions that allow for measurements to be read with an accuracy of 0.5 degrees Celsius. This level of readability ensures that the temperature measurements taken during the ASTM D422 test are precise and reliable.

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  • 3. 

    The dispersing agent is made up of what?

    • A.

      Sodium hydroxide

    • B.

      Sodium bi-carbonate

    • C.

      Sodium hexametaphospahte

    Correct Answer
    C. Sodium hexametaphospahte
    Explanation
    Sodium hexametaphosphate is the dispersing agent in this scenario. Dispersing agents are used to prevent the clumping or aggregation of particles in a solution. Sodium hexametaphosphate is a commonly used dispersing agent due to its ability to bind to particles and keep them separate. Sodium hydroxide and sodium bicarbonate are not typically used as dispersing agents, making sodium hexametaphosphate the correct answer.

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  • 4. 

    The hygroscopic moisture shall be ______ to __________?

    • A.

      10g, 15g

    • B.

      20g, 25g

    • C.

      110g, 120g

    Correct Answer
    A. 10g, 15g
    Explanation
    The hygroscopic moisture refers to the amount of moisture that a substance can absorb from the surrounding environment. In this case, the correct answer suggests that the substance should be able to absorb a range of 10g to 15g of moisture.

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  • 5. 

    The hygroscopic moisture shall be dryed back to a constant weight at what temperature?

    • A.

      110 +/- 5 c

    • B.

      200 +/- 9 f

    • C.

      110 +/- 5 f

    • D.

      None of the above

    Correct Answer
    A. 110 +/- 5 c
    Explanation
    The hygroscopic moisture needs to be dried back to a constant weight at a temperature of 110 +/- 5 degrees Celsius. This means that the moisture should be heated to a temperature within the range of 105 to 115 degrees Celsius in order to remove all the moisture and reach a stable weight.

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  • 6. 

    The coarse sieve shall be perfomed on what fraction of the sample?

    • A.

      Plus #4

    • B.

      Plus #10

    • C.

      Plus #16

    • D.

      Plus #8

    Correct Answer
    A. Plus #4
    Explanation
    The coarse sieve shall be performed on the Plus #4 fraction of the sample. This means that particles larger than the size of the openings in the #4 sieve will be retained on the sieve, while smaller particles will pass through. The #4 sieve has larger openings compared to the #10, #16, and #8 sieves, indicating that it is designed to separate larger particles from the sample.

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  • 7. 

    What would the weight of the sample be for the hydrometer if the material was sandy? 

    • A.

      50 g

    • B.

      100 g

    • C.

      110 g

    • D.

      200 g

    Correct Answer
    B. 100 g
    Explanation
    If the material is sandy, it means that the sample being measured by the hydrometer contains sand particles. Sand is relatively dense and heavy, so it would contribute to the overall weight of the sample. Therefore, the weight of the sample for the hydrometer would be 100 g.

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  • 8. 

    How much dispersing agent is added to the sample for the soaking period?

    • A.

      125 ml

    • B.

      150 ml

    • C.

      100 ml

    • D.

      200 ml

    Correct Answer
    A. 125 ml
    Explanation
    The correct answer is 125 ml. This amount of dispersing agent is added to the sample for the soaking period.

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  • 9. 

    How long does the sample soak in the dipersing agent?

    • A.

      12 hours

    • B.

      10 hours

    • C.

      4 hours

    • D.

      16 hours

    Correct Answer
    D. 16 hours
    Explanation
    The sample is required to soak in the dispersing agent for 16 hours. This duration allows for proper dispersion of the sample particles within the agent, ensuring accurate and reliable results. A longer soaking time allows for better dispersion and avoids any potential errors or inconsistencies in the analysis.

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  • 10. 

    After the sample is put into the 1000 ml beaker it gets turned upside down and back for how long?

    • A.

      10 seconds

    • B.

      60 seconds

    • C.

      110 seconds

    • D.

      30 seconds

    Correct Answer
    B. 60 seconds
    Explanation
    The sample is turned upside down and back for 60 seconds. This duration of time allows for proper mixing and agitation of the sample in the beaker.

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  • 11. 

    The hydrometer bubble gets placed in the soil solution how long prior to taking the reading?

    • A.

      5 to 10 seconds

    • B.

      10 to 25 seconds

    • C.

      1 minute

    • D.

      1 to 2 minutes

    Correct Answer
    B. 10 to 25 seconds
    Explanation
    The hydrometer bubble should be placed in the soil solution 10 to 25 seconds prior to taking the reading. This allows enough time for the bubble to stabilize and for an accurate measurement to be obtained.

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  • 12. 

    The thermometer is placed in suspension and the temperature recorded after each hydrometer reading.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement is suggesting that the thermometer is suspended and the temperature is recorded after each hydrometer reading. This implies that the temperature is being measured accurately and separately from the hydrometer reading. Therefore, the statement is true.

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  • 13. 

    What sieve is the sample washed after the final hydrometer reading?

    • A.

      #40

    • B.

      #10

    • C.

      #200

    • D.

      #100

    Correct Answer
    C. #200
    Explanation
    After the final hydrometer reading, the sample is washed using a sieve with a #200 mesh size. The mesh size of a sieve refers to the number of openings per linear inch. In this case, a #200 sieve has 200 openings per linear inch, indicating that it has a fine mesh size. Washing the sample through this sieve helps to separate any remaining particles that are larger than the #200 mesh size, ensuring a more accurate and precise final measurement.

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