30 Questions
What is the main target of using measuring devices in the context of the text?
To determine the load-deformation relationship for calculation of 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 dial gauges in laboratory testing devices?
To measure the deflection or deformation of different elements
What kind of testing machines are mentioned in the context?
Universal testing machines
What are dial gauges typically attached to in laboratory testing devices?
Frames or holders
Which device is used to measure the deflection or deformation of different elements?
Dial Gauges
What is the purpose of an Extensometer?
To measure the axial deformations of axially loaded elements
What does LVDT stand for?
Linear Variable Differential Transducer
What is the sensitivity range of commercial LVDTs?
0.003 to 0.25 V/mm
What does an LVDT consist of?
Non-magnetic shell and a magnetic core
What does a strain gauge measure?
Small deformations within a certain gauge length
What is the composition of an electrical strain gauge?
Foil or wire bonded to a thin base of plastic or paper
What happens to the electrical resistance of a strain gauge as the element is strained?
It changes proportionally
What happens to the electric resistance of a strain gauge when the length of the gauge is increased and its cross-sectional area is reduced?
Increases linearly proportional to the deformation occurred in the test specimen
What are the advantages of a mechanical dial gauge over an electrical strain gauge?
Easy to use, cheap, can be used several times and for a long period
What is the main purpose of testing machines in the context of the text?
To apply load on the test specimen and measure this load with the required accuracy
What is the function of dial gauges in laboratory testing devices?
To measure the deflection or deformation of different elements
What is the LVDT used for in laboratory testing devices?
To attach at two points between which the relative movement is measured
What is the role of strain gauges in laboratory testing devices?
To measure the electrical resistance of a strain gauge
What is the primary function of data acquisition systems in laboratory testing devices?
To collect, store, and analyze data from various measuring devices
What is the function of an Extensometer in laboratory testing devices?
Measuring the deflection or deformation of axially loaded elements
What is the composition of an electrical strain gauge?
Foil or wire bonded to thin base of plastic or paper
What is the main target of using measuring devices in the context of the text?
To measure the axial deformations of the axially loaded elements
What is the sensitivity range of commercial LVDTs?
0.003 to 0.25 V/mm
What does a strain gauge measure?
Small deformations within a certain gauge length
What is the main function of dial gauges in laboratory testing devices?
Reading measurements with very high accuracy and precision
What happens to the electric resistance of a strain gauge when the length of the gauge is increased and its cross-sectional area is reduced?
It increases linearly
What do LVDTs measure?
Small movements or deformations of the test specimens
What does an electrical strain gauge do when the element is strained?
Its electrical resistance changes proportionally
What is the concept behind the operation of an LVDT?
Deformation of metallic part moving across a magnetic field
This quiz covers the topic of measuring devices as part of the Structures and Properties of Materials course at the Egyptian Chinese University Faculty of Engineering. It encompasses laboratory testing devices such as Testing Machines, Dial Gauges, LVDT, Strain Gauges, and Proving Rings.
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