Usually this AC output voltage is converted by suitable electronic circuitry to high level DC voltage or current that is more convenient to use. b) Aluminium 1. b) S2 and S3 EEG A. Alternating current drives the primary coil causing voltage induced in the two secondary coils proportionate to the length of the linking core. d) Photo-resistive, 13. Vout = displacement of core X VMAX. S1: Transducer is a device which converts physical into electrical quantity d) Change in resistivity, a) Exclusively used for construction of transducers So the differential output is, This equation explains the principle of Operation of LVDT. d) 1 Photo emissive cathode & 1 dynode. c) Electrical energy into thermal energy Lead titanate d) Permanence, a) Magneto-strict ion Vchange = +60mm – (-60mm) X 2.4V/130 = 120 X 2.4/130 = 2.215. Match the following 1. [All About Battery connector pinout 4mgf) It is used to measure the battery temperature. b) Encoder Moving the extension between the primary and secondary windings of a transformer causes the inductance between the two windings to vary, thereby varying the output voltage proportional to the position of the valve or control rod extension. b) Lithium sulphate By designing the signal conditioning electronic circuitry to measure the difference over sum ratio (V - V b) / (V + V ), one can see that the first order of the temperature coefficient of sensitivity is eliminated. One of the most important features of an LVDT is its friction-free operation. As in a transformer, an LVDT consists of a primary winding and a secondary winding wound around a ferromagnetic former, and a movable core … When the core is positioned in the middle, the voltages of secondary coil 1 and secondary coil 2 are equal. When the core is moved to one side, the net voltage amplitude will increase. An LVDT, the cylindrical soft iron core is used to calculate the linear displacement, whereas the cam-shaped rotary ferromagnetic core in RVDT for angular displacement measurements. Each lab station will use a different LVDT model. c) Same Fig 3: As the core moves, the relative coupling and signal output voltage of the two secondary windings changes. The size of air cored transducers in comparison to the iron core parts is, a) Smaller c) Diameter of wire Diagnostic tool for heart alignment b) Dynamic c) Transient d) Both static and dynamic Ans : (b) 29. A strain gauge is a passive transducer and is employed for converting, a) Mechanical displacement into a change of resistance c) Birefringent However, when the core moves away from this central position the amount of induced flux that is coupled into the two secondary coils becomes unequal, which creates a voltage differential in the … Barium titanate The result is a … Ans : (b) 29. Figure 1: Linear variable differential transformer (LVDT) The secondary windings are wound out of phase with each other. c) Thermo-electric a) S1 is true and S2 is false c) S1 is false and S2 is true 2. The two secondary coils are series-opposed, which means wound in series but in opposite directions. Let us consider three different positions of the soft iron core inside the former. c) Change in both length and diameter b) Analog transducer The operation frequency is usually in the range between 1 and 10 kHz [2]. LVDT is an electro-mechanical displacement transducer [9],[13], which has three coils namely one primary and two secondary. Accept Read More, Measurement and Instrumentation Objective Questions – Part 5, Measurement and Instrumentation Objective Questions – Part 4, Temperature Balance System Objective Questions, Flow Measurement Multiple Choice Questions, High Pressure Liquid Chromatography Questions & Answers, Analytical Measurement Multiple Choice Questions, What is FAT and SAT? Diagnostic tool for brain alignment d) Heat, 17. b) Passive transducers b) 1.5 to 2.0 b) Silver electrode b) Length of wire b) Photo-electric 47. b) Passive secondary voltages (V a + V b) remains constant over the displacement measuring range. c) 1,2and 3 S1: In multimode fiber optics, intensity modulating schemes can be employed. Pressure transducer for measuring blood pressure is, a) Strain gauge transducer only In a LVDT, the two secondary voltages, a) Are independent of the core position d) Fiber group. c) Dialysate flow in artificial kidney b) When radiant energy stimulates the crystal b) Primary sensor d) Fiber optic transducer, 36. a) Active a) S1 is true & S2 is false b) Blood flow c) 0.5 to 1.0 a) LDR d). As the primary is connected to an AC source so alternating current and voltages are produced in the secondary of the LVDT. d) 1 – A, 2 – B, 3 – C, 4 – D, 30. )( . c) Elliptical path b) Pressure into a change of resistance Capacitive transducers are normally employed for_________ measurements, a) Static A movable soft iron core is placed inside the former. a) Static b) Dynamic c) Transient d) Both static and dynamic. It consists of a single primary winding P and two secondary windings S 1 and S 2 wounded on cylindrical former. d) Eddy current. c) Heart sound c) Digital transducers b) Mutual inductance d) Selenium. 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 d) Circular path. c) When external magnetic field is applied This website uses cookies to improve your experience. The transducers that converts the input signal into the output signal, which is a discrete function of time is known as ______ transducer. 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