Thus the change of output voltage ranges … Range of frequency is usually from 1 to 10 kHz. The displacement to be measured is applied to an arm connected to the core. ALL ABOUT THE SCIENCE AND TECHNOLOGY...."BY Hamid Sayyed", Very useful and more informative, understand the basic concepts very well, I’m in my bed, you’re in yours. Thus, the net output of the LVDT may be the difference between the two secondary voltages. d) Inverse. c) Dialysate flow in artificial kidney 24. d) LVDT, 5. This results in the two signals on each secondary being 180 deg out of phase. When the core is moved to one side, the net voltage amplitude will increase. The change in resistance of a metal wire owing to strain is due to. d) Change in resistivity, a) Exclusively used for construction of transducers This website uses cookies to improve your experience. b) Synthetic group Figure 1: Linear variable differential transformer (LVDT) The secondary windings are wound out of phase with each other. First of all u will need OPERA ... UNIQUEE TECHNOLOGIES AHMADNAGAR , INDIA. These inductive sensors use a primary coil to generate an AC magnetic field; the magnetic field then couples onto two secondary coils to generate voltages. ________ fiber is used in interferometric instruments. 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? The 0.22µF capacitors on the U1 power pins don’t affect the LVDT operation – they only prevent the op amps from oscillating due to the long leads from the power supply to the breadboard. d) Pulse transducer. The output voltage will be the difference between the two voltages (VS1-VS2) as they are combined in series. Range of frequency is usually from 1 to 10 kHz. b) Analog transducer LVDT is an electro-mechanical displacement transducer [9],[13], which has three coils namely one primary and two secondary. Let us consider three different positions of the soft iron core inside the former. Quiz on Transducer :- 1. I'll use AD598 for 5-wire LVDT signal conditioner. Match the following. d) Heat, 17. A transducer that converts measurand into the form of pulse is called, a) Active transducer When the core is centrally located, the net voltage is zero. If the core is moved out of the centre, the voltage rises in one coil and decreases in … a) Remains unaltered b) Decreas... what is - BTemp ? A rod-shaped soft magnetic core inside the coil assembly provides a path for the magnetic flux linking the coils. 50. Pressure transducer for measuring blood pressure is, a) Strain gauge transducer only d) Heart wall motion, a) Venous blood pressure d) Decreases. 1. b) Mutual inductance Also See : LVDT Working Animation. b) Multimode c) Elliptical path b) Change in length of the wire d) Permanence, a) Magneto-strict ion Thus, two voltages VS1 and VS2 are obtained at the two secondary windings S1 and S2 respectively. c) Analog transducers Generally, when the moveable core/slug is positioned symmetrically relative to the two secondary windings (at the “null” position), the differential output may be approximately zero, because the voltage of each secondary coil winding is equal but of opposite phase. Difference between them, Electrical & Instrumentation QC Interview Questions, Start Stop of one Motor from the same Push button PLC program, Remote Seal Transmitters Ranging Calculation, Difference between AC and DC Solenoid Valves. Quartz and Rochelle salt belongs to _______ of piezo-electric materials, a) Natural group The sensitivity range of LVDT is high, ranging 2.4mV per the voltage and per degree change in moments and 2 to 3 mV per voltage per degree rotation in RVDT. c) Both S1 & S2 are true a) Static b) Dynamic c) Transient d) Both static and dynamic. d) Both S1 & S2 are false, 27. Which of the following are piezo electric substances? In normal use, there is no mechanical contact between the LVDT's core and coil assembly, so there is no rubbing, dragging, or other source of friction. b) Dynamic d) Excitation voltage, 9. b) S2 and S3 Movement of the core triggers the linkage from primary to both the secondary coils, which changes the induced voltages. The two secondary coil is represented as S1 and S2. The magnetic flux, which is developed, is coupled by the core to the adjacent secondary windings S 1 and S 2. Stethoscope D. instrument used to hear pulse/heart beat, a) 1- B, 2 – A, 3 – C, 4 – D S2: Schemes using polarizing techniques need birefringent fiber. a) LDR Capacitive transducers are normally employed for_____ measurements a) Static b) Dynamic c) Transient d) Both static and dynamic Ans : (b) 29. b) Length of wire on the two secondary. The AC excitation voltage is 5 to 12V and the operating frequency is given by 50 to 400 HZ. d) Both static and dynamic, 1. a) Are independent of the core position b) Vary unequally depending on the core position c) Vary equally depending on the core position d) Are always in phase quadrature. According to the AD598 datasheet, the input voltage range is 1~3Vrms. 14. b) 2 Photo emissive cathodes & 2 dynodes b) Exclusively used for stress analysis b) Power c) Limb movement d) Electrical energy into light energy, 7. S2: Transducer is also called as sensor. c) Birefringent Alternating current drives the primary coil causing voltage induced in the two secondary coils proportionate to the length of the linking core. d) When the junction of two such crystals are heated, S1: Low fatigue life If the two secondary coils are wired in series opposition, as shown in Figure (4.6), then the two voltages will subtract; that is, the differential voltage is formed. d) Pulse transducers. d). The resistance of LDR ________________ when exposed to radiant energy. S1: In multimode fiber optics, intensity modulating schemes can be employed. b) 1 – B, 2 – A, 3 – D, 4 – C Vout = displacement of core X VMAX. The voltage displacement of LVDT. b) Strain gauge or capacitive transducer In a graded index fiber, the total reflected light takes a _________, a) Straight line path This feature is particularly useful in materials testing, vibration displacement measurements, and high resolution dimensional gaging systems. c) Digital transducers 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) Digital plethysmography c) When external magnetic field is applied d) Self generating transducer, 32. One of the most important features of an LVDT is its friction-free operation. Displacement = Vout X length/ VMax . D = 2.75 X 120/2.4 = 137.5 mm. _________ is the example of photo emissive cell. Diagnostic tool for brain alignment b) Larger b) 1,3and4 The … d) Foot pressure, 46. Fiber optic sensor can be used to sense _________, a) Displacement It consists of a primary coil with two secondary coils placed on either side of the primary coil. Current in the primary coil induces e.m.f. Barium titanate b) Vary unequally depending on the core position a) Remains unaltered 4. The transformer acts as an electromechanical transducer that outputs an alternating current (AC) voltage proportional to the angular displacement of its rotor shaft. 3. Null Position– This is also called the central position as the soft iron core will remain in the exact center of t… When the core moves away from the center of the LVDT, known as the null point, the signal from the primary will be coupled to one secondary more than the other. a) Monomode c) Same b) Vibrations Figure F1 illustrates a valve whose position is indicated by an LVDT. 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