Stress-Strain Measurement and Strain Gauges Quiz
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Questions and Answers

What is a key advantage of mechanical strain gauges?

  • Utilizes optical levers for amplification
  • Suitable for dynamic measurements
  • High sensitivity to ambient conditions
  • Self-contained magnification system (correct)

    • Why are optical strain gauges unsuitable for measuring dynamic strain?

  • Require auxiliary equipment for operation
  • They have high sensitivity to temperature and humidity
  • Inability to accommodate different gauge lengths
  • Slow response due to high inertia (correct)

    • What is the main function of an extensometer in mechanical strain gauges?

  • To accommodate a wide range of gauge lengths
  • To measure strain under static or gradually varying loading conditions (correct)
  • To provide real-time data visualization
  • To sense and magnify change in length

    • How do optical strain gauges amplify the relative displacement between knife edges?

    <p>By rotating while undergoing displacement</p> Signup and view all the answers

    Why are electrical strain gauges not mentioned in the given text?

    <p>The text does not cover them under types of strain gauges</p> Signup and view all the answers

    What is the definition of strain?

    <p>The change in length of a line segment divided by the original length of the segment</p> Signup and view all the answers

    What is the usual practice for strain measurement with respect to gauge lengths?

    <p>To make measurements over the shortest possible gauge lengths</p> Signup and view all the answers

    What do strain gauges measure?

    <p>Dimensional change on the surface of the structural member under test</p> Signup and view all the answers

    Where are strain gauges mostly used to measure strains?

    <p>On the free surface of a body</p> Signup and view all the answers

    What do the equations suggest about determining strains at any point on the surface of a body?

    <p>If the two displacements u and v can be measured at all points on the surface, strains at any point can be determined</p> Signup and view all the answers

    What is the primary purpose of a strain gauge?

    <p>To indicate strain at only one point on a structural member</p> Signup and view all the answers

    What are the Cartesian strain components used to characterize the state of strain at any point on the free surface of a body?

    <p>\( ho_{xx}, ho_{yy}, \ heta_{xy} \)</p> Signup and view all the answers

    What do the given equations suggest about determining strains at any point on the surface of a body?

    <p>Strains can be determined by measuring the displacement components u and v at all points on the surface of a body</p> Signup and view all the answers

    What is the usual practice for strain measurement with respect to gauge lengths?

    <p>Strain measurement is usually done over shortest possible gauge lengths</p> Signup and view all the answers

    What is a key requirement for good strain gauges according to the text?

    <p>Capability to indicate static, transient, and dynamic strain</p> Signup and view all the answers

    What is a major disadvantage of mechanical strain gauges?

    <p>Unsuitable for dynamic measurements and varying strain</p> Signup and view all the answers

    Which type of strain gauge uses a combination of mechanical and optical levers for amplifying relative displacement?

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

    What is the sensitivity of the Tuckerman optical gauge?

    <p>2 micro strain</p> Signup and view all the answers

    Why are electrical strain gauges not mentioned in the given text?

    <p>They are not commonly used in engineering applications</p> Signup and view all the answers

    What is the main advantage of optical strain gauges over mechanical strain gauges?

    <p>Suitable for dynamic measurements and varying strain</p> Signup and view all the answers

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