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 (C)</p> Signup and view all the answers

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

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

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

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

What is the purpose of an Extensometer?

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

What does LVDT stand for?

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

What is the sensitivity range of commercial LVDTs?

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

What does an LVDT consist of?

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

What does a strain gauge measure?

<p>Small deformations within a certain gauge length (A)</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 (C)</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 (D)</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 (C)</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 (A)</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 (C)</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 (B)</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 (D)</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 (C)</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 (A)</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 (D)</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 (C)</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 (C)</p> Signup and view all the answers

What is the sensitivity range of commercial LVDTs?

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

What does a strain gauge measure?

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

What do LVDTs measure?

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

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