Structures and Properties of Materials MCE132 Measuring Devices
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Questions and Answers

What is the main target of using measuring devices in the context of the text?

  • To determine the load-deformation relationship for calculation of material mechanical properties (correct)
  • To calculate the volume and density of materials
  • To measure temperature and pressure of materials
  • To analyze the chemical composition of materials

    • Which device is used to apply load on the test specimen and measure this load with the required accuracy?

  • Proving Rings
  • Testing Machines (correct)
  • Dial Gauges
  • LVDT

    • What is the main function of dial gauges in laboratory testing devices?

  • To calculate the volume and density of materials
  • To measure temperature and pressure of materials
  • To measure the deflection or deformation of different elements (correct)
  • To analyze the chemical composition of materials

    • What kind of testing machines are mentioned in the context?

    <p>Universal testing machines</p> Signup and view all the answers

    What are dial gauges typically attached to in laboratory testing devices?

    <p>Frames or holders</p> Signup and view all the answers

    Which device is used to measure the deflection or deformation of different elements?

    <p>Dial Gauges</p> Signup and view all the answers

    What is the purpose of an Extensometer?

    <p>To measure the axial deformations of axially loaded elements</p> Signup and view all the answers

    What does LVDT stand for?

    <p>Linear Variable Differential Transducer</p> Signup and view all the answers

    What is the sensitivity range of commercial LVDTs?

    <p>0.003 to 0.25 V/mm</p> Signup and view all the answers

    What does an LVDT consist of?

    <p>Non-magnetic shell and a magnetic core</p> Signup and view all the answers

    What does a strain gauge measure?

    <p>Small deformations within a certain gauge length</p> Signup and view all the answers

    What is the composition of an electrical strain gauge?

    <p>Foil or wire bonded to a thin base of plastic or paper</p> Signup and view all the answers

    What happens to the electrical resistance of a strain gauge as the element is strained?

    <p>It changes proportionally</p> Signup and view all the answers

    What happens to the electric resistance of a strain gauge when the length of the gauge is increased and its cross-sectional area is reduced?

    <p>Increases linearly proportional to the deformation occurred in the test specimen</p> Signup and view all the answers

    What are the advantages of a mechanical dial gauge over an electrical strain gauge?

    <p>Easy to use, cheap, can be used several times and for a long period</p> Signup and view all the answers

    What is the main purpose of testing machines in the context of the text?

    <p>To apply load on the test specimen and measure this load with the required accuracy</p> Signup and view all the answers

    What is the function of dial gauges in laboratory testing devices?

    <p>To measure the deflection or deformation of different elements</p> Signup and view all the answers

    What is the LVDT used for in laboratory testing devices?

    <p>To attach at two points between which the relative movement is measured</p> Signup and view all the answers

    What is the role of strain gauges in laboratory testing devices?

    <p>To measure the electrical resistance of a strain gauge</p> Signup and view all the answers

    What is the primary function of data acquisition systems in laboratory testing devices?

    <p>To collect, store, and analyze data from various measuring devices</p> Signup and view all the answers

    What is the function of an Extensometer in laboratory testing devices?

    <p>Measuring the deflection or deformation of axially loaded elements</p> Signup and view all the answers

    What is the composition of an electrical strain gauge?

    <p>Foil or wire bonded to thin base of plastic or paper</p> Signup and view all the answers

    What is the main target of using measuring devices in the context of the text?

    <p>To measure the axial deformations of the axially loaded elements</p> Signup and view all the answers

    What is the sensitivity range of commercial LVDTs?

    <p>0.003 to 0.25 V/mm</p> Signup and view all the answers

    What does a strain gauge measure?

    <p>Small deformations within a certain gauge length</p> Signup and view all the answers

    What is the main function of dial gauges in laboratory testing devices?

    <p>Reading measurements with very high accuracy and precision</p> Signup and view all the answers

    What happens to the electric resistance of a strain gauge when the length of the gauge is increased and its cross-sectional area is reduced?

    <p>It increases linearly</p> Signup and view all the answers

    What do LVDTs measure?

    <p>Small movements or deformations of the test specimens</p> Signup and view all the answers

    What does an electrical strain gauge do when the element is strained?

    <p>Its electrical resistance changes proportionally</p> Signup and view all the answers

    What is the concept behind the operation of an LVDT?

    <p>Deformation of metallic part moving across a magnetic field</p> Signup and view all the answers

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