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 materials testing?

  • To analyze the chemical composition of the material
  • To determine the load-deformation relationship (correct)
  • To measure the electrical resistance of the material
  • To calculate the material's weight

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

  • Dial Gauges
  • Testing Machines (correct)
  • Strain Gauges
  • LVDT

    • What is the main function of a dial gauge in materials testing?

  • To apply load on the test specimen
  • To measure the deflection or deformation of different elements (correct)
  • To measure the electrical resistance of the material
  • To calculate the material's weight

    • What type of testing machines can be used for applying tension and compression loads?

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

    What is the purpose of proving rings in materials testing?

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

    Which device is attached at two points between which the relative movement is measured?

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

    What is the function of an extensometer in laboratory testing?

    <p>To measure the axial deformations of the 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 structure of the LVDT device?

    <p>Contains one primary and two secondary electric coils, with a magnetic core</p> Signup and view all the answers

    What property does a strain gauge measure?

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

    How is the deformation of a test specimen transferred to the strain gauge?

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

    What is the function of increasing the length of the strain gauge and reducing its cross-sectional area?

    <p>To increase the electric resistance of the gauge linearly proportional to the deformation occurred in the test specimen</p> Signup and view all the answers

    What is an advantage of using a mechanical dial gauge over an electrical strain gauge?

    <p>Can be used several times and for a long period</p> Signup and view all the answers

    Which laboratory testing device is used to measure small deformations within a certain gauge length?

    <p>Strain gauge</p> Signup and view all the answers

    What property does an LVDT measure?

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

    What does an electrical strain gauge consist of?

    <p>Foil or wire bonded to a thin base of plastic or paper, with one primary and two secondary electric coils</p> Signup and view all the answers

    What is the main target of using measuring devices in materials testing?

    <p>To determine the load-deformation relationship and calculate the material mechanical properties</p> Signup and view all the answers

    Which laboratory testing device is used to measure small deformations within a certain gauge length?

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

    What property does a strain gauge measure?

    <p>Deformation</p> Signup and view all the answers

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

    <p>Testing Machines</p> Signup and view all the answers

    What does LVDT stand for?

    <p>Linear Voltage Deformation Transducer</p> Signup and view all the answers

    What type of testing machines can be used for applying tension and compression loads?

    <p>Universal Testing Machines</p> Signup and view all the answers

    What is the purpose of an LVDT (Linear Variable Differential Transducer) in laboratory testing?

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

    What is the function of a strain gauge in materials testing?

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

    How does an LVDT work to measure deformations?

    <p>By providing an output voltage that depends on the value of the movement</p> Signup and view all the answers

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

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

    In which laboratory testing device can an increase in the length of the gauge and a reduction in its cross-sectional area lead to an increase in electric resistance?

    <p>Strain gauge</p> Signup and view all the answers

    What is the primary function of an extensometer in laboratory testing?

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

    What does a mechanical dial gauge offer as an advantage over an electrical strain gauge?

    <p>Can be used several times and for a long period</p> Signup and view all the answers

    What property does an LVDT measure?

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

    What property does a strain gauge measure?

    <p>The electrical resistance changes proportionally with deformation</p> Signup and view all the answers

    What is the function of increasing the length of the strain gauge and reducing its cross-sectional area?

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

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