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Which of the following transducers is classified as an active transducer a from ECE MISC at CHAITANYA ENGINEERING COLLEGE There are various electrical and electronic components are used to build the circuits and projects for engineering students. Active transducer is a transducer, which converts the non-electrical quantity into an electrical quantity. Mathematically, it can be represented as, $$e \alpha \left ( T_{1}-T_{2} \right )$$. A transducer is a device that converts one type of energy to another. Hence, we will get the following three active transducers depending on the non-electrical quantity that we choose. Thermocouple transducer is the most commonly used thermoelectric transducer. Hence, we will get the following three active transducers depending on the non-electrical quantity that we choose. Measurement and Instrumentation Objective Questions 1. Ability to withstand environmental conditions. In general, the process of transduction involves the conversion of one form of energy into another form. Active and Passive Transducer . The resistor, which depends on temperature is called thermal resistor. Looking for active transducer? Thermocouple, Photovoltaic cell and more are the best examples of the transducers. Let us consider the non-electrical quantities such as pressure, illumination of light and temperature. The transducer whose output is obtained in the form of voltage or current without any additional auxiliary source is known as the active transducer. In short, it is called Thermistor. Photoelectric B . Selected transducer must be free from errors. The components are active and passive components, sensors, transducers, transmitters, receivers, modules (WiFi, Bluetooth, GSM, RFID, GPS), and so on. Mathematically, the relation between resistance of thermistor and temperature can be represented as, $$R_{1}=R_{2}e^\left ( \beta \left [ \frac{1}{T_{1}}-\frac{1}{T_{2}} \right ] \right )$$, $R_{1}$ is the resistance of thermistor at temperature ${T_{1}}^{0}K$, $R_{2}$ is the resistance of thermistor at temperature ${T_{2}}^{0}K$. Learn ultrasound physics transducers with free interactive flashcards. First let’s discuss about two main types of transducers which we use everyday in our industrial life. The temperature coefficient of thermistor is negative. 4. For example, a thermocouple is an active transducer. The output voltage can be measured across the metal electrodes, which are placed on two sides of quartz crystal. Here input quantity is non-electrical quantity. An example is the thermocouple; here, the fact that a current will flow in a continuous circuit of two metals, if the two junctions are at different temperatures, is used to generate electricity.… They produce an electrical signal proportional to the input (physical quantity). Active Transducer. They produce electrical output themselves. It must have high degree of accuracy and repeatability. Choose from 500 different sets of ultrasound physics transducers flashcards on Quizlet. Let the temperature at junction, 1 is $T_{1}$. Log in. Ø These transducers develop an electrical parameter (i.e. The transduction medium may be resistive, inductive or capacitive depends on the conversion process that how input transducer converts the input signal into resistance, inductance and capacitancerespectively. The output quantity may or may not be electrical quantity. Active transducers are those which do not require any power source for their operation. The major difference between active and passive transducer is that an active transducer has the ability to convert one form of energy into another form (electrical) without using an external source of power. Find out information about active transducer. An example of a passive transducer is differential transformers. The PZT is one-half wavelength thick. Answer to Which of the following is active transducer ? B. An active transducer is said to be piezo electric transducer, when it produces an electrical quantity which is equivalent to the pressure input. Consider a constant reference temperature, $T_{2}$ at junction 2. The part of the circuit, which lies between hot & cold junctions including those two junctions is an equivalent model of basic thermocouple. The active transducer generates its own electrical voltage during conversion. Thermocouple generates an emf (electro motive force), whenever the values of $T_{1}$ and $T_{2}$ are different. College. 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