Size Measurement Methods Quiz
16 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the relationship between mesh number and mesh size?

  • As mesh number increases, mesh size increases.
  • Mesh size is the same regardless of mesh number.
  • As mesh number increases, mesh size decreases. (correct)
  • Mesh number and mesh size are independent of each other.
  • What is the primary purpose of sieve analysis?

  • To separate particles based on their size. (correct)
  • To increase the volume of solid material.
  • To mix different materials thoroughly.
  • To analyze the chemical composition of minerals.
  • What is the appropriate arrangement of sieves during the testing method?

  • Finest sieve at the top and coarsest at the bottom.
  • Coarsest sieve at the top and finest at the bottom. (correct)
  • Random arrangement of sieves is acceptable.
  • All sieves should be placed horizontally.
  • What is 'cumulative weight percentage passing' in sieve analysis?

    <p>The cumulative sum of individual weight percentages from the bottom of the table. (A)</p> Signup and view all the answers

    What are mesh numbers used for in sieve cloth?

    <p>To represent the number of apertures per linear inch. (C)</p> Signup and view all the answers

    During sieve analysis, why might hand sieving be performed after using a sieve shaker?

    <p>To enhance accuracy in measurement. (C)</p> Signup and view all the answers

    What does an increase in mesh number indicate concerning the size of the apertures?

    <p>The apertures will become smaller. (B)</p> Signup and view all the answers

    What is a key function of the pan or receiver placed below the bottom sieve?

    <p>To collect the final undersize materials. (C)</p> Signup and view all the answers

    Which size measurement method involves the use of optical or electron microscopy?

    <p>Visual methods (A)</p> Signup and view all the answers

    What does the equivalent diameter of an irregular particle represent?

    <p>The diameter of a spherical particle having the same controlling characteristics as the irregular particle (B)</p> Signup and view all the answers

    Which of the following is NOT a characteristic diameter used in size measurement?

    <p>Radius diameter (A)</p> Signup and view all the answers

    What is the primary purpose of using microscopy in size analysis?

    <p>To estimate particle range and dispersion (D)</p> Signup and view all the answers

    Which size measurement method employs techniques like laser diffraction and acoustic attenuation?

    <p>Field scanning methods (B)</p> Signup and view all the answers

    In sedimentation, which diameter refers to a spherical particle having the same settling velocity as the particle under Stokesian conditions?

    <p>Stokes’ diameter (B)</p> Signup and view all the answers

    Which of the following measurement methods includes techniques like sieving and impaction?

    <p>Separation methods (D)</p> Signup and view all the answers

    What is the diameter of a particle that shares the same volume as the irregular particle called?

    <p>Volume diameter (B)</p> Signup and view all the answers

    Flashcards

    Visual Methods in Size Measurement

    Methods using visual tools like microscopes, to determine particle size.

    Optical Microscopy Size Range

    Measurements of particle sizes between 3-1000 m using light microscopes.

    Equivalent Diameter

    Diameter of a sphere having the same characteristic (e.g., volume, surface area) as an irregularly-shaped particle.

    Volume Diameter (dv)

    Diameter of a sphere with the same volume as an irregular particle.

    Signup and view all the flashcards

    Surface Diameter (ds)

    Diameter of a sphere with the same surface area as an irregular particle.

    Signup and view all the flashcards

    Test Sieve

    A circular brass shell used for separating particles based on size (sieving).

    Signup and view all the flashcards

    Separation Methods (Size Measurement)

    Methods that physically isolate particles by size differences.

    Signup and view all the flashcards

    Microscopy Size Analysis

    A method of size analysis where individual particles are observed under a microscope.

    Signup and view all the flashcards

    Sieve Cloth

    Wire woven cloth with uniform square openings.

    Signup and view all the flashcards

    Mesh Number

    Number of openings per linear inch in a sieve.

    Signup and view all the flashcards

    Mesh Size

    Distance between two parallel wires of a sieve.

    Signup and view all the flashcards

    Sieve Analysis

    Method to determine particle size distribution in a sample.

    Signup and view all the flashcards

    Differential Analysis

    Calculating weight percentages of material retained on each sieve.

    Signup and view all the flashcards

    Cumulative Weight Percentage Retained

    Total weight of material retained to a certain mesh size.

    Signup and view all the flashcards

    Cumulative Weight Percentage Passing

    Total weight of material that passes through a certain mesh size.

    Signup and view all the flashcards

    Study Notes

    Size Measurement Methods

    • Methods and instruments for size measurement are categorized into six groups for simplicity.
    • Visual methods: Optical, electron, and scanning electron microscopy, image analysis.
    • Separation methods: Sieving, classification, impaction, electrostatic differential mobility.
    • Stream scanning methods: Electrical resistance zone, optical sensing zone measurements.
    • Field scanning methods: Laser diffraction, acoustic attenuation, photon correlation spectroscopy.
    • Sedimentation and Surface methods: Permeability and adsorption.

    Visual Methods: Microscopy

    • Microscopy is used alongside other size analysis methods to determine the size range and degree of dispersion.
    • It's the only method that allows visualization of individual particles.
    • Common measurement ranges include:
      • 3-1000 µm for optical microscopy
      • 2 nm to 1 µm for Transmission Electron Microscopy (TEM)
      • 20 nm to 1000 µm for Scanning Electron Microscopy (SEM)

    Equivalent Diameter

    • Defining the size of irregularly shaped particles is done by comparison with standard shapes, usually spheres.
    • Volume diameter (dv): The diameter of a sphere having the same volume as the irregular particle. Formula: dv = (6Vp/π)1/3 = 1.241Vp1/3
    • Surface diameter (ds): The diameter of a sphere having the same surface area as the irregular particle. Formula: ds= (4Ap/π)1/2= 0.564Ap1/2
    • Stokes' diameter: The diameter of a sphere having the same settling velocity as the particle under Stokesian conditions.
    • Newton's diameter: The diameter of a sphere having the same settling velocity as the particle under Newtonian conditions.

    Separation Methods: Sieving

    • Test sieves are circular brass shells used to separate particles based on size.
    • Sieve cloth made of wire with uniform square openings for separation.
    • Aperture (or Opening): Distance between parallel wires.
    • Mesh number: Number of apertures per linear inch.
    • Mesh size: Distance between wires. Mesh number and mesh size are inversely related. (Higher mesh number, smaller mesh size)
    • Sieve analysis: A mineral processing method where particles are separated based on size.
    • Procedure:
      • Arrange sieves into a nest (coarsest to finest).
      • Place the material to be tested on the topmost sieve.
      • Shake the sieves to allow particles to pass through.
      • Weigh the material retained on each sieve.
      • Calculate the percentage of material retained on each sieve to produce the differential analysis.

    Particle Size Distribution Data

    • Particle sizes are often measured and reported in tabular format (e.g., Table 1).
    • Weight percentages of retained material on each sieve are calculated for differential analysis.
    • Cumulative weight percentages are obtained by sequentially adding the individual weight percentages from either top or bottom of the table.
    • Mean particle sizes for each fraction are calculated (e.g., Table 2). Formula for calculating average size: Average size = 100/Σ (widi), where wi is the weight percent of the material retained by the sieve, and di is the mean size of the material retained by the same sieve.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Size Measurement Methods PDF

    Description

    Test your knowledge on various size measurement methods including visual, separation, stream scanning, and field scanning techniques. This quiz covers essential instruments used for size analysis, with a focus on microscopy and its applications. Challenge yourself to understand the methods and their respective measurement ranges.

    More Like This

    Bacterial Size and Measurement Quiz
    4 questions
    Virus Size Measurement
    16 questions
    Cell Structure and Size Quiz
    45 questions
    Use Quizgecko on...
    Browser
    Browser