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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?

Two scales (D) Signup and view all the answers

Which testing machine is specifically used for compression testing?

Compression testing machine (C) Signup and view all the answers

What is the aim of using proving rings?

To determine material mechanical properties (B) Signup and view all the answers

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

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

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

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

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

It increases as the core moves away from the center of the shell (B) Signup and view all the answers

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

Their ability to change electrical resistance proportionally to strain (A) 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?

It increases linearly (A) Signup and view all the answers

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

It is not sensitive enough to detect small changes in resistance (B) Signup and view all the answers

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

Axial deformation only (C) 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?

LVDT (Linear Variable Differential Transducer) (A) Signup and view all the answers

What is one advantage of using a mechanical dial gauge over an electrical strain gauge?

Can be used several times and for a long period (D) Signup and view all the answers

What property allows strain gauges to detect small deformations?