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They are also able to measure the thickness or density of non-conductive materials. Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. Application of LVDT: It modifies the inductance of the circuitas well as the equivalent output. They generate a high-frequency electromagnetic field near the sensing face. Full disclaimer here. b) M = k$$\sqrt{L_1}$$ Self-inductance depends on ________ One end of the capacitor terminal stores positive energy and the other terminal stores negative energy. •Can measure both static and dynamic changes. Now first our motive is to find how the inductive transducers can be made to work. Inductive & Displacement Transducers - MCQs with answers 1. Definition: The transducer whose resistance varies because of the environmental effects such type of transducer is known as the resistive transducer. View Answer, 4. For the time being let’s focus on the basic introduction of inductive transducers. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering.  It measures force in terms of displacement of ferromagnetic core of a transformer. ... Capacitive sensors are also commonly used to measure pressure.  It converts translational or linear displacement into electrical voltage. Inductive and LVDT sensors for displacement, distance and position ... Inductive gaging sensors measure the geometry of work-pieces in quality assurance and production. Mutual inductance between two coils is given as _________ Actually what happens? c) plank’s constant a) permeability c) L = N2⁄S Slide-wire resistor . The variation of resistance ‘R’ with temperature ‘T’ can be presented as: R=R0 (1+α1T+α2T2+…) Passive transducers require an external power, and the output is a measure of so me variation (resistance or capacitance) . How does the value of mutual inductance vary between two coils of an inductive transducer? b) self-inductance and coefficient of coupling The inductive type consists of a Linear Voltage Differential Transformer (LVDT) where core is positioned by the pressure through a diaphragm or a bellows element as shown in the figure below.. Secondary voltages are nothing but the result of induction due to the flux change in the secondary coil with the displacement of the iron bar. b) inversely proportional The circuit o/p can be directly adjusted against the input value. measured. This change in mutual inductance can be calibrated with the displacement and measurement can be done. It can be found in a various range of values. ... Pressure Sensors measure absolute, gauge and differential pressures. •Applied force is measure as change of inductance in the coil. Definition: Capacitive Transducer is a device which changes its capacitance with change in the physical phenomena to be measured. When a coil is placed near to coil carrying alternating current, a circulating current is induced in it which in turn produces its own flux which try to reduce the flux of the coil carrying the current and hence inductance of the coil changes. With the change in distance in displacement coefficient of coupling changes and it causes the change in mutual inductance. Here transducers, which work on change of mutual inductance principle, use multiple coils. Hence an extra setup is required to protect it from Stray Magnetic Field. This paper presents the first Soft Inductive Tactile Sensor (SITS) which exploits an inductance-transducer mechanism based on the eddy-current effect. Strain gauge (resistive transducer) A strain gauge is a passive transducer which uses electrical resistance variation in wires to sense the strain produced by a force on the wire. It is a passive transducer which required external source of supply to function. View Answer, 6. Linear Variable Differential Transformer (LVDT)  LVDT is an inductive type passive transducer. What is the relation between the self-inductance and the reluctance of a coil? Hence, a small variation in the air gap results in a measurable change in inductance. Both coils have their self-inductance as well. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Capacitive displacement sensors "are non-contact devices capable of high-resolution measurement of the position and/or change of position of any conductive target". Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. Differential transformer CLASSIFICATION OF TRANSDUCERS A transducer may be classified based upon: 1. For the sake of understanding we can say that if the displacement is to be measured by the inductive transducers, it should change any of the above parameter for causing in the change in self inductance. Inductive transducer is used for the measurement of physical quantities. The transducer which does not requires any external excitation to provide their outputs are referred as active transducer. LVDT sensors are installed parallel to the absorber cylinders and measure their travel range continuously. Resistive transducers. Measurement of Power & Related Parameters, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Electrical Measurements Questions and Answers – Pressure Sensor, Next - Electrical Measurements Questions and Answers – Capacitive Transducer, Electrical Measurements Questions and Answers – Pressure Sensor, Electrical Measurements Questions and Answers – Capacitive Transducer, Mechanical Behaviour & Testing of Materials Questions and Answers, Instrumentation Transducers Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Electrical Engineering Questions and Answers, Design of Electrical Machines Questions and Answers, Electrical Machines Questions and Answers, Electrical Measurements Questions and Answers, Basic Electrical Engineering Questions and Answers, Basic Electrical Engineering Questions and Answers – Energy Stored in an Inductor, Basic Electrical Engineering Questions and Answers – Alternating Current in a Resistive & Inductive Circuit, Instrumentation Transducers Questions and Answers – Inductive Transducers, Basic Electrical Engineering Questions and Answers – Inductance in Terms of Flux Linkages Per Ampere, Electrical Measurements Questions and Answers – Shunts and Multipliers, Electrical Measurements Questions and Answers – Advanced Problems on Measurement of Inductance using AC Bridges, Electrical Measurements Questions and Answers – Low Power Factor Wattmeter, Electrical Measurements Questions and Answers – Qmeter, Electrical Measurements Questions and Answers – Classification of Transducers. A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer Inductive Transducer A passive transducer is said to be an inductive transducer, when it produces the variation (change) in inductance value. The transduction element of capacitive transducer is a capacitor which may be a parallel plate, cylindrical or angular capacitor. Mutual inductance between these two coils is given by.  It is also known as Linear Variable Differential Transducer. Self-inductance of an inductor is given by ________ Anyway, LVDT is discussed here briefly to explain the principle of inductive transducer. Therefore, directly it provides the parameter’s valve to … b) 10 The circuit diagram of inductive transducer, which is used to measure displacement is shown in below figure. b) False To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. The inductive transducers work on the principle of the magnetic induction of magnetic material. (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula. This can be done by changing the flux with the help of measured and this changing flux obviously changes the inductance and this inductance change can be calibrated in terms of measured. View Answer, 8. b) False Since LVDT is Inductive Transducer, so it is sensitive to Stray Magnetic Field. In an eddy current transducer output depends on the variation in the eddy current. For low-pressure measurements generally, resistance type (load cell) type transducer is used otherwise we use the inductive type in which core moves inside the coil proportional to … a) directly proportional This principle is used in such type of inductive transducers. 2. d) L = N2 d) rydberg constant They cannot measure static pressure, instead, they measure pressure variances in real-time. So let’s denote their self-inductance by L1 and L2. You measure this using a voltmeter with the black test lead on 0V (common) and the red test lead on the BK (output) of the sensor and the meter set to measure DC Voltage. a. SITSs measure the inductance variation caused by changes in AC magnetic field coupling between coils and conductive films. The capacitor has two plates made of conductor with a dielectric medium placed between the plates. d) 20 A basic inductive sensor consists of a magnetic circuit made from a ferromagnetic core with a coil wound on it. Measurement of Displacement using Inductive Transducer. A conductive target is required, but a ground connection to the measuring system is not necessary. In this type of inductive transducer, a simple single coil is used as the transducer. b) L = 1⁄S c) no relation View Answer, 7. Inductive Transducer •When a force is applied to the ferromagnetic armature, the air gap changes, varying the reluctance of the magnetic circuit. Capacitors are also called a condenser. Inductive distance sensors (AlphaProx) are based on the same measuring principle as inductive proximity switches. LD400:Miniature DC Output Displacement Transducers with Acetal Bearings LVDT Sensors - determine whether you need to measure a relative current: C-in, AC-out, DC-in, DC-out; or measuring resonant frequencies of coils as a function of coil position, frequency based devices. An inductive transducer measures the variation in ________ Now coefficient of coupling depends on the distance and orientation between two coils. Inductive transducer is used for the measurement of physical quantities. d) permittivity of air Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Just as the resistance of the electric conductor depends on number of factors, the induction of the magnetic material depends on a number of variables like the number of turns of the coil on the material, the size of the magnetic material, and the permeability of the flux path. - Sure Controls Nearer the plate is to the coil, higher will be eddy current and higher is the reduction in inductance and vice versa. LVDT will be explained in another article in more detail. Since it is an electromagnetic device, so it also gets affected by the vibrations and temperature variation. Reluctance of a coil is given by which of the following relation? a) reluctance View Answer. c) capacitance Captive Armatures: These mechanisms are better for long working ranges. Thus for the measurement of displacement we can fix one coil and make other movable which moves with the source whose displacement is to be measured. d) constant Based on self-inductance of a coil, how many types of inductive transducers are available? Ex:-Resistive,inductive and capacitive transducers -An inverse transducer is defined as a device which converts an electrical quantity into a … This property is used for the measurement of temperature and each transducer is called Resistive Thermometer and falls in the category of electrical resistive transducer. Piezoelectric pressure transducers are an example of non-static or dynamic pressure transducers. a) True Particularly inductive transducer is used for the detection of type of metal, finding missing parts or counting the number of objects. 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