MCE132 Measuring Devices in Materials Engineering Quiz

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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?

Testing Machines 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?

Testing Machines Signup and view all the answers

What is a load cell specifically used for?

Applying load on the test specimen with required accuracy Signup and view all the answers

What is the main function of LVDT in laboratory testing?

To measure the small movements or deformations of test specimens Signup and view all the answers

What is the purpose of an Extensometer in laboratory testing?

To measure the axial deformations of axially loaded elements Signup and view all the answers

What does LVDT stand for in laboratory testing devices?

Linear Variable Differential Transducer Signup and view all the answers

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

It increases proportionally Signup and view all the answers

How is the output voltage obtained in an LVDT?

By moving the metallic part across a magnetic field Signup and view all the answers

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

To measure the small movements or deformations of test specimens Signup and view all the answers

What do LVDTs vary widely in?

Sensitivity and range Signup and view all the answers

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

Special electric circuits Signup and view all the answers

What kind of device is a Strain Gauge?

Electrical device Signup and view all the answers

What kind of device is an Extensometer?

Mechanical device Signup and view all the answers

Which process is used to produce polymers?

Polymerization Signup and view all the answers

What is the primary distinguishing feature of polymers?

They are good electrical and thermal insulators Signup and view all the answers

Which elements are polymers chemically based on?

Carbon, hydrogen, and nonmetallic elements Signup and view all the answers

What is an example of a thermoset polymer?

Polyester Signup and view all the answers

Which of the following is not a common polymer?

Aluminum oxide (Al2O3) Signup and view all the answers

What is the primary drawback of polymers?

Low strength Signup and view all the answers

What is the primary function of additives in polymers?

To improve or modify mechanical, chemical, physical properties Signup and view all the answers

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

Thermosets polymers Signup and view all the answers

What distinguishes elastomers (synthetic rubber) from other polymers?

They have the ability to be deformed and spring back to their original form Signup and view all the answers

What is the main characteristic of thermosets polymers?

Tightly linked molecular chains Signup and view all the answers

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

Degree of crystallinity Signup and view all the answers

What is the characteristic of thermoplastic polymers when heated?

They soften and eventually liquefy Signup and view all the answers

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

Easily formed into thin, flexible, airtight film for food packaging Signup and view all the answers

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

"Spring back" to their original form after deformation Signup and view all the answers

How do thermosets polymers differ from thermoplastic polymers?

"Tightly linked" molecular chains vs "not rigidly connected" Signup and view all the answers

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

To produce large molecules, or polymers, from small molecules Signup and view all the answers