MCE132 Measuring Devices in Materials Engineering Quiz

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Questions and Answers

What is the main target of all the measuring devices mentioned in the text?

  • To analyze chemical compositions of materials
  • To determine the load-deformation relationship to calculate material mechanical properties (correct)
  • To test the electrical conductivity of materials
  • To measure temperature and pressure accurately

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

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

What type of scales do most dial gauges have?

  • Three scales
  • One scale
  • Two scales (correct)
  • Five scales

Which lab testing device can be used for tension, compression, and universal tests?

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

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

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

What is a load cell specifically used for?

<p>Applying load on the test specimen with required accuracy (D)</p> Signup and view all the answers

What is the main function of LVDT in laboratory testing?

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

What is the purpose of an Extensometer in laboratory testing?

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

What does LVDT stand for in laboratory testing devices?

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

How does the electrical resistance of a Strain Gauge change when it is strained?

<p>It increases proportionally (D)</p> Signup and view all the answers

How is the output voltage obtained in an LVDT?

<p>By moving the metallic part across a magnetic field (A)</p> Signup and view all the answers

What is the primary function of a Strain Gauge in laboratory testing?

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

What do LVDTs vary widely in?

<p>Sensitivity and range (A)</p> Signup and view all the answers

What is used to detect the change in resistance in a Strain Gauge?

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

What kind of device is a Strain Gauge?

<p>Electrical device (A)</p> Signup and view all the answers

What kind of device is an Extensometer?

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

Which process is used to produce polymers?

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

What is the primary distinguishing feature of polymers?

<p>They are good electrical and thermal insulators (C)</p> Signup and view all the answers

Which elements are polymers chemically based on?

<p>Carbon, hydrogen, and nonmetallic elements (B)</p> Signup and view all the answers

What is an example of a thermoset polymer?

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

Which of the following is not a common polymer?

<p>Aluminum oxide (Al2O3) (D)</p> Signup and view all the answers

What is the primary drawback of polymers?

<p>Low strength (D)</p> Signup and view all the answers

What is the primary function of additives in polymers?

<p>To improve or modify mechanical, chemical, physical properties (D)</p> Signup and view all the answers

Which type of polymers become permanently hard during their formation and do not soften upon heating?

<p>Thermosets polymers (D)</p> Signup and view all the answers

What distinguishes elastomers (synthetic rubber) from other polymers?

<p>They have the ability to be deformed and spring back to their original form (A)</p> Signup and view all the answers

What is the main characteristic of thermosets polymers?

<p>Tightly linked molecular chains (B)</p> Signup and view all the answers

What is the primary difference between amorphous and semi-crystalline polymers?

<p>Degree of crystallinity (B)</p> Signup and view all the answers

What is the characteristic of thermoplastic polymers when heated?

<p>They soften and eventually liquefy (C)</p> Signup and view all the answers

What is a common application of polyethylene due to its properties?

<p>Easily formed into thin, flexible, airtight film for food packaging (A)</p> Signup and view all the answers

What is the primary characteristic of elastomers (synthetic rubber)?

<p>&quot;Spring back&quot; to their original form after deformation (D)</p> Signup and view all the answers

How do thermosets polymers differ from thermoplastic polymers?

<p>&quot;Tightly linked&quot; molecular chains vs &quot;not rigidly connected&quot; (A)</p> Signup and view all the answers

What is the purpose of polymerization in the context of polymers?

<p>To produce large molecules, or polymers, from small molecules (D)</p> Signup and view all the answers

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