What is strain gauge dynamometer?
A strain-gauge dynamometer system in the form of a body of rotation is simple to make and convenient to use; some such gauges are available as circular plates for clamping on the outside diameter, with the load applied to a rigid center [I]. The wire device is mounted near the rim.
What is the working principle of strain gauge?
What is the working principle of Strain Gauge? A strain gauge works on the principle of electrical conductance and its dependence on the conductor’s geometry. Whenever a conductor is stretched within the limits of its elasticity, it doesn’t break but, gets narrower and longer.
Which of the following dynamometer uses strain gauge?
It is an electro-mechanical technique and the dynamometer used in process can be termed as electro-mechanical dynamometer. wheatstone bridge circuit is commonly used in connection with electrical strain gauges.
How does dynamometer measure force?
dynamometer, device for measuring mechanical force, or power, transmitted by a rotating shaft. Since power is the product of torque (turning force) and angular speed, all power-measuring dynamometers are essentially torque-measuring devices; the shaft speed is measured separately.
What is meant by 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 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. The gauge factor is defined as: where. ε = strain = = absolute change in length.
What is construction of strain gauge?
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 types of strain gauge?
The following different kind of strain gauges are available in the market:
- Linear strain gauges.
- Membrane Rosette strain gauges.
- Double linear strain gauges.
- Full bridge strain gauges.
- Shear strain gauges.
- Half bridge strain gauges.
- Column strain gauges.
- 45°-Rosette (3 measuring directions)
What are the types of strain gauge?
The three types of strain gage configurations, quarter-, half-, and full-bridge, are determined by the number of active elements in the Wheatstone bridge, the orientation of the strain gages, and the type of strain being measured.
What is the main use of strain gauge Mcq?
This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Strain Gauge Measurement Technique”. Explanation: Strain gauge makes use of the practical form of Wheatstone’s bridge to measure the strain developed by an element.
Where are dynamometers used?
Dynamometers are commonly referred to as a dynameter or dyno. They are used to measure power, output, force, and torque. A force is applied to the flexible metallic ring of the dynamometer, it bends, and the applied force is measured. They are used in a variety of industries from laboratory science to manufacturing.
What is the working principle of dynamometer?
In an engine dynamometer, water flow, proportional to the desired applied load, creates resistance to the engine. A controlled water flow through the inlet manifold is directed at the center of the rotor in each absorption section. This water is then expelled to the outer dynamometer body by centrifugal force.
What kind of dynamometer is used for strain gauges?
It is an electro-mechanical technique and the dynamometer used in process can be termed as electro-mechanical dynamometer. wheatstone bridge circuit is commonly used in connection with electrical strain gauges. The basic principle involved in this technique is that, the electric resistance of wire changes when it is stretched.
How is the torque measured on a dynamometer?
The power transmission dynamometers on the other side are measuring torque through sensors, usually strain-gauges that are placed on the driving shaft and deform as the axis rotate.
How are two sets of strain gauges connected?
Two sets of strain gauges are cemented, one set on top and bottom and second set on two vertical sides. These two sets are connected one each, to separate Wheatstone bridge circuits. During experiment, these two sets of strain gauges are subjected to tension and compression.
How does a dynamometer work in steady state?
In the steady state, the engine is kept running at a specific RPM value while the tester gradually applies more braking torque on the dynamometer (we use an absorption dynamometer in this instance).