MCE132 Measuring Devices in Materials Engineering
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Questions and Answers

What is the main target of using measuring devices?

  • To measure the electrical conductivity of materials
  • To determine the load-deformation relationship and calculate material mechanical properties (correct)
  • To measure temperature accurately
  • To calculate the volume of materials

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

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

    • What is the main function of a dial gauge?

  • To calculate material density
  • To measure deflection or deformation of different elements (correct)
  • To measure electrical resistance
  • To measure temperature

    • How many scales do most dial gauges have?

    <p>Two scales</p> Signup and view all the answers

    Which testing machine is specifically used for compression testing?

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

    What is the aim of using proving rings?

    <p>To determine material mechanical properties</p> Signup and view all the answers

    What is the purpose of an extensometer in laboratory testing devices?

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

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

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

    How is the output voltage of an LVDT affected by the position of the core within the shell?

    <p>It increases as the core moves away from the center of the shell</p> Signup and view all the answers

    What property of strain gauges allows them to measure small deformations within a certain gauge length?

    <p>Their ability to change electrical resistance proportionally to strain</p> Signup and view all the answers

    How is the electric resistance of a strain gauge affected by increasing the length of the gauge and reducing its cross-sectional area?

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

    What is a disadvantage of using an ohmmeter to detect changes in resistance in strain gauges?

    <p>It is not sensitive enough to detect small changes in resistance</p> Signup and view all the answers

    What type of deformation does a strain gauge measure within a test specimen?

    <p>Axial deformation only</p> Signup and view all the answers

    In which laboratory testing device does a metallic part move across a magnetic field to produce an output voltage?

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

    What is one 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

    What property allows strain gauges to detect small deformations?

    <p>Their ability to change electrical resistance proportionally to strain</p> Signup and view all the answers

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