16 Questions
What is the main target of using measuring devices?
To determine the load-deformation relationship and calculate material mechanical properties
Which device is used to apply load on the test specimen and measure this load with the required accuracy?
Testing Machines
What is the main function of a dial gauge?
To measure deflection or deformation of different elements
How many scales do most dial gauges have?
Two scales
Which testing machine is specifically used for compression testing?
Compression testing machine
What is the aim of using proving rings?
To determine material mechanical properties
What is the purpose of an extensometer in laboratory testing devices?
To measure the axial deformations of the axially loaded elements
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
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
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
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
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
What type of deformation does a strain gauge measure within a test specimen?
Axial deformation only
In which laboratory testing device does a metallic part move across a magnetic field to produce an output voltage?
LVDT (Linear Variable Differential Transducer)
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
What property allows strain gauges to detect small deformations?
Their ability to change electrical resistance proportionally to strain
Explore the fundamental concepts of measuring devices used in materials engineering, taught by Dr. Engy Hany at the Egyptian Chinese University's Faculty of Engineering. Understand the purpose of testing machines, dial gauges, LVDT, strain gauges, and proving rings in determining material mechanical properties.
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