30 Questions
What does a photoconductive transducer convert to change in resistance of semiconductor material?
Light
What do transducers convert?
Non-electrical quantity to electrical quantity
What type of transducer converts electrical quantity to a non-electrical quantity?
Resistive transducer
What is the resistive element provided with in a potentiometer?
Wiper
What does a strain gauge convert mechanical elongation and compression into?
Resistance change
What formula is used to express the resistance of a metal conductor?
$R = \rho L / A$
What type of external power source is used for transducers that are not self-generating?
DC power supply
What type of devices convert the physical quantity to be measured into mechanical signals in some transducers?
Primary transducers
In capacitive transduction transducers, the measurand is converted into a change in which parameter?
Capacitance
What is the purpose of the dielectric in a typical capacitor used in capacitive transduction?
To help the parallel plates maintain their stored electrical charges
What are electrical devices called that convert mechanical signals into corresponding electrical signals?
Secondary transducers
What do transducers produce as output signals in response to the quantity to be measured?
Variation in resistance, capacitance, inductance, or other electrical parameters
What type of strain gauge consists of a wire stretched between two points in an insulating medium?
Unbonded
Which material is commonly used for the wire in Unbonded strain gauges?
Copper
What is the primary function of Wire covering with thin material in Bonded strain gauges?
To prevent mechanical damage
Which type of strain gauge is used when a high gauge factor is desired?
Semiconductor gauge
What is the main characteristic of Thermistors used as strain gauges?
Negative temperature coefficient to resistivity
In a Thermocouple, what is the purpose of joining a pair of dissimilar metals at one end?
To generate a voltage proportional to temperature difference
What is the main purpose of an inductive transducer?
Convert physical motion into a change in inductance
Which type of transducer uses the basic generator principle to induce a voltage?
Self generating inductive transducers
What type of material is typically used in resistance thermometers for their wires?
Platinum
In what type of environment would you use a probe type sensor?
Immersion in a medium whose temperature needs to be measured or controlled
What is the main function of a sensor system?
Acquire information from the real world
What principle do variable-inductance transducers work on?
Variation in self inductance and mutual inductance
What is the relationship between the output voltage V0 and the input voltage Vs in a potentiometer?
$\frac{V_{0}}{Vs} = \frac{R_{23}}{R_{13}}$
In a strain gauge element, what does the fractional change in resistance (ΔR/R) depend on?
Strain applied to the material
How is the load voltage VL related to the output voltage V0 in the presence of a load resistance RL in a system?
Directly proportional if RL is infinite
What is the function of a capacitive displacement sensor in terms of resolution and accuracy?
Enhances resolution and accuracy
How is strain defined in relation to a flexible element with electrical resistance strain gauges?
Ratio of change in length to original length
What causes a resistance change in electrical resistance strain gauges mounted on a flexible element?
Deformation or displacement
Test your knowledge about different types of strain gauges including Wire gauge Unbonded and Bonded varieties, their uses, and construction details. Learn about the materials used, applications, and working principles of strain gauges.
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