Therefore, directly it provides the parameter’s valve to … View Answer, 5. a) 5 Anyway, LVDT is discussed here briefly to explain the principle of inductive transducer. If the sensor is a Normally Open (NO) NPN-type sensor, the output will go from the supply voltage to nearly 0V DC. Differential transformer CLASSIFICATION OF TRANSDUCERS A transducer may be classified based upon: 1. Capacitor begins charging when electrica… Inductive Transducer A passive transducer is said to be an inductive transducer, when it produces the variation (change) in inductance value. Linear Inductive Position Sensors are durable and provide high accuracy measurements for demanding hydraulic or pneumatic position feedback applications. Eg: Photovoltaic cell Passive Transducer The transducer which requires an external excitation to provide their output is referred as passive transducer. View Answer, 7. Mutual inductance depends on _________ •Applied force is measure as change of inductance in the coil. It can be found in a various range of values. They store electrons. Resistance strain gauge . b) resistance Reluctance of a coil is given by which of the following relation? b) self-inductance and coefficient of coupling 2. the following formula for inductance, L of an inductor. 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.. b) inversely proportional Hence an extra setup is required to protect it from Stray Magnetic Field. Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. The change in resistance is measured by the ac or dc measuring devices. A basic inductive sensor consists of a magnetic circuit made from a ferromagnetic core with a coil wound on it. 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. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. Hence inductive transducers use one of the following principles for its working. 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. We know very well that self inductance of a coil is given byWhere,N = number of turns.R = reluctance of the magnetic circuit. b) 10 It is a passive transducer which required external source of supply to function. a) True a) L = N⁄S How does the value of mutual inductance vary between two coils of an inductive transducer? The dimen- ... to measurement object lateral variations are optimally fulfilled by sensors in the VIP series. 2. View Answer, 4. Inductive transducer is used for the measurement of physical quantities. The magnitude of variation corresponds to the intensity of the pressure. The circuit o/p can be directly adjusted against the input value. 3. Where, μ = effective permeability of the medium in and around the coil. Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. So let’s denote their self-inductance by L1 and L2. In an eddy current transducer output depends on the variation in the eddy current. Self-inductance of an inductor is given by ________ This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Inductive Transducer”. - Sure Controls Ex:-Resistive,inductive and capacitive transducers -An inverse transducer is defined as a device which converts an electrical quantity into a … View Answer, 3. For example, LVDT, a kind of inductive transducers, measures displacement in terms of voltage difference between its two secondary voltages. Usually, the measurand could be a rotary or linear displacement, force, … a. For the time being let’s focus on the basic introduction of inductive transducers. Inductive transducers find application in proximity sensors which are used for position measurement, dynamic motion measurement, touch pads etc. By the variation in self-inductances and coupling coefficient b. d) 20 Self-inductance depends on ________ Inductive & Displacement Transducers - MCQs with answers 1. c) capacitance They are also able to measure the thickness or density of non-conductive materials. An inductive transducer measures the variation in ________ Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? 1. Now first our motive is to find how the inductive transducers can be made to work. Thus inductance of coil varied with the variation of distance between coil and plate. ... Capacitive sensors are also commonly used to measure pressure. Resistive transducers. Piezoelectric pressure transducers are an example of non-static or dynamic pressure transducers. View Answer, 6. View Answer, 8. d) S = 1⁄μA Particularly inductive transducer is used for the detection of type of metal, finding missing parts or counting the number of objects. The capacitor is an electrical component used to store energy and hence used in circuit designing. b) S = 1⁄μ In this type of inductive transducer, a simple single coil is used as the transducer. 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. To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. b) L = 1⁄S Here transducers, which work on change of mutual inductance principle, use multiple coils. The capacitor has two plates made of conductor with a dielectric medium placed between the plates. A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer LVDT will be explained in another article in more detail. d) L = N2 Slide-wire resistor . This change in mutual inductance can be calibrated with the displacement and measurement can be done. Measurement of Displacement using Inductive Transducer. A conductive target is required, but a ground connection to the measuring system is not necessary. a) True c) 4 Hence, a small variation in the air gap results in a measurable change in inductance. Inductive transducer is used for the measurement of physical quantities. a) reluctance In the inductive transducers the magnetic materials are used in the flux … Now coefficient of coupling depends on the distance and orientation between two coils.  It is also known as Linear Variable Differential Transducer. 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. Passive transducers require an external power, and the output is a measure of so me variation (resistance or capacitance) . 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. The resistive transducer is used for measuring the physical quantities like temperature, displacement, vibration etc. SITSs measure the inductance variation caused by changes in AC magnetic field coupling between coils and conductive films. c) L = N2⁄S Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Inductive sensor mainly includes an induction loop which is enough for detecting electromagnetic. ... Pressure Sensors measure absolute, gauge and differential pressures. b) M = k\(\sqrt{L_1}\) View Answer. Captive Armatures: These mechanisms are better for long working ranges. We use here two coils for the sake of understanding. c) no relation The circuit diagram of inductive transducer, which is used to measure displacement is shown in below figure. In Inductive transducers, the basic principle is that self-inductance of a single coil or the mutual inductance between two coils is changed by a quantity to be measured i.e. Application of LVDT: c) S = a⁄μA 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. Mutual inductance between two coils is given as _________ b) permittivity How Do Inductive Pressure Transducers Work? They cannot measure static pressure, instead, they measure pressure variances in real-time. This paper presents the first Soft Inductive Tactile Sensor (SITS) which exploits an inductance-transducer mechanism based on the eddy-current effect. Inductive and LVDT sensors for displacement, distance and position ... Inductive gaging sensors measure the geometry of work-pieces in quality assurance and production. A capacitor has two terminals and acts as a passive element. Nearer the plate is to the coil, higher will be eddy current and higher is the reduction in inductance and vice versa. Inductive sensors measure inductance variations caused by movement of a flux-concentrating element. contamination and surface finish variations of the target. b) False measurand. d) rydberg constant a) M = k\(\sqrt{L_1 L_2}\) 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. Mutual inductance between these two coils is given by. Here, the ending points of two secondary windings are joined together. Inductive Eddy Current: Inductive eddy current sensors operate by generating a high frequency electro-magnetic field about the sensor coil which induces eddy currents in a target material. Both coils have their self-inductance as well. measured. 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 … The working of these sensors can be done by generating an oscillating electromagnetic field which is formed by a magnetic object when it is in motion. 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. d) self-inductance The linear variable differential transformer (LVDT) (also called linear variable displacement transformer, linear variable displacement transducer, or simply differential transformer) is a type of electrical transformer used for measuring linear displacement (position). They generate a high-frequency electromagnetic field near the sensing face. There are mainly three types of electrical pressure transducers – inductive, resistive, and capacitive. Capacitors are also called a condenser. Capacitive transducers. Of understanding an extra setup inductive transducer measures the variation in required, but a ground connection to the armature. To be measured inductance variations caused by movement of a magnetic circuit affected by AC! 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