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What is the principle of strain gauge measurement Mcq?

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What is the principle of strain gauge measurement Mcq?

Explanation: An electrical strain gauge works on the basis of change in resistance as a function of strain. The wire resistance increases with tension and reduces with compression. 2.

What is strain gauge?

A strain gauge is a type of electrical sensor. It’s primary use is to measure force or strain. The resistance of a strain gauge changes when force is applied and this change will give a different electrical output. Strain gauges use this method to measure pressure, force, weight and tension.

What is strain gauge and types?

The strain gauge is a passive transducer that converts the mechanical elongation and compression into the resistance strain. It is invented in 1938 by Arthur Claude Ruge and Edward E. In the geotechnical field, the strain gauges are the important sensors. …

Where are strain gauges used?

Strain gauges are used to measure the torque applied by a motor, turbine, or engine to fans, generators, wheels, or propellers. This equipment is found in power plants, ships, refineries, automobiles and industry at large.

What is strain gauge transducer?

A strain gauge type transducer converts physical quantity such as load, pressure or displacement into mechanical strain on the strain generating body (elastic body), and the mechanical strain is converted into electrical output using strain gauges mounted on the elastic body.

What is meant by gauge factor?

Gauge factor (GF) or strain factor of a strain gauge is the ratio of relative change in electrical resistance R, to the mechanical strain ε.

What is strain gauge construction?

A strain gauge is constructed by forming a grid made of fine electric resistance wire or photographically etched metallic resistance foil on an electrical insulation base (backing), and attaching gauge leads.

What are the two types of strain gauge?

Different Types of Strain Gauge Geometries

  • Linear Strain Gauge. A linear strain gauge is used to record strain in the direction in which its measuring grid is aligned.
  • Shear Strain Gauge.
  • Rosette Strain Gauge.
  • Chain Strain Gauge.
  • Full-bridge Strain Gauge.

How is strain gauge measured?

Therefore, to measure the strain, you have to accurately measure very small changes in resistance. For example, suppose a test specimen undergoes a strain of 500 me. A strain gage with a GF of 2 exhibits a change in electrical resistance of only 2 (500 x 10-6) = 0.1%. For a 120 Ω gage, this is a change of only 0.12 Ω.

What is gauge factor formula?

Gauge Factor: The gauge factor is defined as the ratio of per unit change in resistance to per unit change in length. It is a measure of the sensitivity of the gauge. Gauge factor, Δ R R = G f Δ L L = G f ε

Why is strain gauge considered so important?

The main function of a strain gauge is to measure fatigues in metals. It is considered as important measuring equipment for ensuring productivity and safety. There are various categories of measuring instruments and many more if the products within each category are counted.

What is the principle of the operation of strain gauge?

A strain gauge is an electrical transducer which is used for measuring mechanical surface strain. Basic Principle of Strain Gauge When stress is applied to the metal conductor, its resistance changes owing to change in length and cross-sectional area of the conductor.

What would one use a strain gauge for?

Strain gauges are used to determine or verify component or structure stresses, or by manufacturers of load cells, pressure and torque transducers, etc., where they utilise the physical parameter being measured to strain a part of the transducer in a linear way.

How can I calibrate a strain gauge?

Determine R R = 2/3 = 0.667 R = 2.14/3.00 = 0.7133

  • Determine+Full Scale = (F T/R)*+Full Scale = (100/0.667) = 150 psi+Full Scale = (30,000/0.7133) = 42,058 microstrain
  • Determine a baseline calibration value.†‡