Range. The transducers that converts the input signal into the output signal, which is a discrete function of time is known as _____ transducer. Accuracy. •High sensitivity: as high as 40 V/mm. These transducers work on the principle of magnetic induction, it may be self-generating or passive type. Measurement and Instrumentation Objective Questions 1. Transducers are broadly classified as self-generating or non-self-generating. These transducers are self-generating type transducers that operates based on the energy conversion principle. The output of the digital transducers is in the digital form that means it is in the form of digital pulses discrete in time. a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. The smallest difference between measured values that can be discriminated. These pulses from a unique code for each value sensed. b) Noise figure of more than 0 db. Transducers may be classified according to their application, method of energy conversion, nature of output signal, etc. The active transducers are self-generating devices which operate under the energy conversion principle. These transducers do not need any external source of power for their operation. Transducers, on the basis of methods of energy conversion used, may be classified into active and passive transducers. voltage or current) which is proportional to the quantity under measurement. Select one: True. It contains two parts that are closely related to each other i.e. When a plate of iron or other ferromagnetic material is moved with respect to the magnet, the flux field expands or collapses and a voltage is induced in the coil. It is achieved by displacing the core of the coil that is attached to a mechanical sensing element. These transducers draw the energy needed for their operation from the measuring system itself. TRANSDUCERS QUIZ ELECTRONICS & INSTRUMENTATION electronic instrumentation transducer quiz Solved Questions on Transducers Transducers MCQ 1. The block diagram of active transducer is shown in below figure. a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. And a lot more… mywbut.com electrical generator principle is used in self-generating type… For example, it corresponds to the last stable figure on a digital display. An active transducer is a self-generating type transducer that has the ability to generate electrical voltage or current as its output without using any external source of power. So they are not self generating type transducers. • In other word it is a device that is capable of converting the physical quantity into a proportional electrical Self generating type transducers are _____ transducers. For using electrical methods for measurement, such a nonelectrical quantity is required to be converted into corresponding electrical signal using a device called transducer. It modifies the inductance of the circuitas well as the equivalent output. Copyright © Electronics Club All rights reserved. Sub sequentially, some device is active or self-generating type transducers. Most appropriate transducer principle to be used for the given physical quantity. These transducers produce the output signal in the form of variation in resistance, capacitance or some other electrical parameter in response to the quantity to be measured. … Fig.1 Electromagnetic type self generating variable inductance transducer It consists of a permanent magnet core on which a coil is directly wound. See the answer. Active Transducers The transducer, which can produce one of the electrical quantities such as voltage and current is known as active transducer. 1. In most of the instrumentation systems, the input quantity is nonelectrical. a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. The energy requires for generating the output signals are obtained from the physical quantity which is to be measured. Sensors Types • There are several transducers that will be examined further in terms of their principles of operations. This chapter presents a general study of non-self-generating transducers. •As the output of active transducers we get an equivalent electrical output signal e.g. The electrical device then converts this mechanical signal into a corresponding electrical signal. A thermistor reacts to temperature variations. Self generating type transducers are _____ transducers. Sensitivity. III. Precision. Differences between MTI and Pulse Doppler Radar, Multiplexing | Frequency Division, Time Division. The principle of operation of variable resistance transducer is Capacitive transduction: In the case, the measurand is converted in the capacitance. Previous question Next question temperature or strain to electric potential, without any external source of … In any measurement system, section of appropriate transducer is the most important step in getting accurate results. Your email address will not be published. These transducers produce the output signal in the form of variation in resistance, capacitance, inductance or some other electrical parameter in response to the quantity to be measured. Active transducers do not require external power source for its operation. A transducer is also called as a pick-up element. Primary and Secondary Transducers Some transducers consist of a mechanical device along with an electrical device. Self Generated Transducers The self generated transducers don’t use the A DC power supply or an audio frequency generator is used as an external power source. II. Some transducers contain the mechanical as well as electrical devices. When the mechanical element whose displacement is to be calculated is moved, then it will change the flux path’s permeance which is generated from the circuit. The transducers that converts the input signal into the output signal, which is a discrete function of time is known as _____ transducer. • Those include : 1. False. The accuracy of the sensor is the maximum difference that will exist between the actual value and the indicated value at the output of the sensor. • The electromagnetic transducer are self generating active transducers • The motion between a piece of magnet and an electromagnet is responsible for the change in flux 13. Thus, the physical quantity under measurement may cause a change in resistance, inductance or capacitance using proper transducer and these change in turn cause corresponding changes in output voltage or current. a) Active b) Passive c) Secondary d) Inverse Ans : (a) 2. Electromagnetic transduction: In this transduction, the measurend is converted to the voltage induced in a conductor by the change in the magnetic flux, in the absence of excitation. Tansducers converts non-electrical quantity to electrical quantity while inverse transducers convert electrical quantity to a non electrical quantity. These transducers need the external power supply for their operation. the transducers, which develop their own electrical voltage or current without any auxiliary source, are called the active transducers. While defining the sensitivity, we assume that the input-output characteristic of the instrument is approximately linear in that range. List of project that utilize transducer to measure various varying quantity. The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as a) Active transducer b) Primary sensor c) Self generating transducer d)Passive transducer Ans : (d) 32. Active Transducers . A DC power supply or an audio frequency generator is used as an external power source. The active transducers further classified as. 1. Ø Active transducers are self-generating type of transducers. However, a sharp distinction in the classification is difficult and often results in overlapping. The transducers that converts the input signal into the output signal, which is a discrete function of time is known as ______ transducer. Inductive type transducers o Self generating and non-self generating types o LVDT → non-self generating type o E o = Es 1 ~ Es 2. o Advantages •Linearity: upto 5 mm. 1. •Velocity,temperature ,light intensity and force can be transduced with the help of vibrationsactive transducers . Telemetering system—when input and output are in electrical form. Solution for Active transducers are self generating type transducers. Resistive Position Transducers 2. They will produce current or voltage due to stimulation of some physical form of energy. Ø These transducers develop an electrical parameter (i.e. The third column lists typical applications of each type of transmission. It is a self-generating transducer. This problem has been solved! 31. • A transducer is a device that convert one form of energy to other form. . thermocouple. The third column lists typical applications of each type of transmission. 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