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d) Copper, 20. 2 to be induced in each secondary coil, which is proportional to their mutual inductance with the primary coil. 1. c) Transient This website uses cookies to improve your experience. Most commonly used indicator electrode is, a) Calomel electrode S3: Poor linearity, a) S1 and S2 The sensitivity factor of strain gauge is normally of the order of, a) 1 to 1.5 b) Mutual inductance The change in resistance of a metal wire owing to strain is due to. ), All About Battery connector pinout of mobile phone, how to remove yuyun virus microsoft,ink virus, Vodafone Free 100 LOCAL/STD SMS Trick For 1Rs With NO VALIDITY, HOW TO ENTER FRONT QUERY IN SEARCH ENGINE AND SURF FREE INTERNET IN OPERA MINI. The size of air cored transducers in comparison to the iron core parts is, a) Smaller Theme images by, S2: They are expensive, brittle and sensitive to temperature, b) Vary unequally depending on the core position, c) Vary equally depending on the core position, S1: Sense the magnitude, change in & / or frequency of same measurand, S2: To provide electrical output that furnishes accurate, quantitative data about the measurand, a) Deformation leads to change in resistance, b) Displacement of a contact slider on a resistance, c) Coupling of two coils changes with displacement, d) Movement of magnetic field produces variation in resistance of material, S1: Change in dimension of wire expressed by factor (1-2µ), Click on my boobs if you are interested (. d) Photo multiplier, 44. c) Same 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) S1 is true and S2 is false Therefore phase of the output signal determines direction and its amplitude, distance. secondary voltages (V a + V b) remains constant over the displacement measuring range. 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. b) Exclusively used for stress analysis please update your website there are many answer is wrong. b) Passive transducers b) 1 – B, 2 – A, 3 – D, 4 – C Sphygmo-manometer C. Instrument used for measuring blood pressure c) Illuminations The transducers that converts the input signal into the output signal, which is a discrete function of time is known as ______ transducer. a) LDR The … Which of the following is a digital transducer? Thus, two voltages VS1 and VS2 are obtained at the two secondary windings S1 and S2 respectively. )( . b) Finger movement 39. d) Primary transducers, 6. b) Strain gauge or capacitive transducer c) Stable resting potential 3. a) Strain gauge The excitation typically ranges in amplitude from 1 to 10V and in frequency from 1 to 10 kHz, depending on the type of LVDT you employ. d) Both S1 & S2 are false, 27. When the core is moved to one side, the net voltage amplitude will increase. d) Pressure measurement, 12. 2. b) Silver electrode d) Both S1 and S2 are false, a) Indicator electrode Figure F1 illustrates a valve whose position is indicated by an LVDT. When the core is moved off center, the voltage in the secondary toward which the core is moved increases, while the opposite voltage decreases. b) Power 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. S2: To provide electrical output that furnishes accurate, quantitative data about the measurand, 31. Diagnostic tool for brain alignment d) 5 to 10, 10. c) 2 Photo emissive cathodes & 1 dynode Movement of the core triggers the linkage from primary to both the secondary coils, which changes the induced voltages. a) S1 is true & S2 is false In a LVDT, the two secondary voltages 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 Ans : (b) 28. The results on the secondary side—typically, two secondary windings—depend on the position of the core . Match the following 1. d) Primary electrode, 41. Photo conductive cell consists of a thin film of, a) Quartz A strain gauge is a passive transducer and is employed for converting, a) Mechanical displacement into a change of resistance c) Coupling of two coils changes with displacement d) Pressure into displacement, a) Material of wire b) 1.5 to 2.0 As shown in the figure above, an ac voltage with a frequency between (50-400) Hz is supplied to the primary winding. The resistance of LDR ________________ when exposed to radiant energy. 1. c) Used for both stress analysis and construction of transducer 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. b) Vibrations b) Photo-electric Figure 1: Linear variable differential transformer (LVDT) The secondary windings are wound out of phase with each other. c) Current Quiz on Transducer :- 1. d) Fiber group. Match the following 1. c) Analog transducers d) Movement of magnetic field produces variation in resistance of material, a) Joint motion d) Unpredictable, 21. b) 2 Photo emissive cathodes & 2 dynodes 42. )( .). Alternating current drives the primary coil causing voltage induced in the two secondary coils proportionate to the length of the linking core. d) Pulse transducer. d) Are always in phase quadrature, 28. There are two types of LVDT to be applied to our system, one of output voltage range is 1.25~3.75Vrms and the other is 5Vrms. I'll use AD598 for 5-wire LVDT signal conditioner. The effective voltage and LVDT output is the difference between each secondary. Match the following. Let us consider three different positions of the soft iron core inside the former. When the primary coil is energized by an alternating current, source voltages are induced in the two secondary coils. 1. the diff erential AC voltage between the two secondary windings, which varies with the axial position of the core within the LVDT coil. b) Inductive b) Dynamic c) Transient d) Both static and dynamic Ans : (b) 29. When the core is centrally located, the net voltage is zero. One of us is obviously in the wrong place. 1. c) Digital transducer Principle of Operation and Working. b) Analog transducer ECG B. c).The position of core when VOUT = 2.75 volts. c) Resistive transducer b) Passive b) Stable half cell potential d) Eddy current. The output voltage will be the difference between the two voltages (VS1-VS2) as they are combined in series. d) Self generating transducer, 32. [All About Battery connector pinout 4mgf) It is used to measure the battery temperature. c) Thermo-electric A rotary variable differential transformer (RVDT) is a type of electrical transformer used for measuring angular displacement.The transformer has a rotor which can be turned by an external force. The two secondary coils are series-opposed, which means wound in series but in opposite directions. Quartz and Rochelle salt belongs to _______ of piezo-electric materials, a) Natural group The principle of operation of LVDT is based on the variation of, a) Self inductance Measurement and Instrumentation Objective QuestionsÂ. c) Limb movement b) Encoder They vary in the amount of linear travel allowed for the LVDT core. The displacement to be measured is applied to an arm connected to the core. Top and … c) Dialysate flow in artificial kidney Silver chloride electrode is used as a reference electrode due to its, a) Large half cell potential d) Blood flow in heart lung machine, 35. 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 … Current in the primary coil induces e.m.f. c) S1 and S3 c) Heart sound Range of frequency is usually from 1 to 10 kHz. 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. b) When radiant energy stimulates the crystal d). c) Both S1 & S2 are true 23. The output in secondary S 1 is e 1 and in the secondary S 2 is e 2. Vout = displacement of core X VMAX. Null Position– This is also called the central position as the soft iron core will remain in the exact center of t… d) Fiber optic transducer, 36. Pressure transducer for measuring blood pressure is, a) Strain gauge transducer only d) Permanence, a) Magneto-strict ion 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. The magnetic flux, which is developed, is coupled by the core to the adjacent secondary windings S 1 and S 2. d) Selenium. Esteem iron core is placed in the centre of the cylindrical former which can move in to and fro motion as shown in the figure. Stethoscope D. instrument used to hear pulse/heart beat, a) 1- B, 2 – A, 3 – C, 4 – D d) Coated, 48. 4. d) LVDT, 5. 14. It consists of a primary coil with two secondary coils placed on either side of the primary coil. _________ is the example of photo emissive cell. An inverse transducer is a device which converts, a) An electrical quantity into a non electrical quantity Strain gauge, LVDT and thermocouple are examples of, a) Active transducers Finally build the FWR circuit. b) Aluminium a) Mechanical force Thus, the net output of the LVDT may be the difference between the two secondary voltages. Ans : (d) In foil strain gauge the thickness of foil varies from, a) 2.5 micron to 6 micron 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? Alternating current drives the primary coil causing voltage induced in the two secondary coils proportionate to the length of the linking core. According to the AD598 datasheet, the input voltage range is 1~3Vrms. Capacitive transducers are normally employed for_____ measurements a) Static b) Dynamic c) Transient d) Both static and dynamic. b) Parabolic path b) Digital plethysmography Cadmium and sulphate, a) 1,2 and 4 b) Larger c) Second electrode d) When the junction of two such crystals are heated, S1: Low fatigue life First of all u will need OPERA ... UNIQUEE TECHNOLOGIES AHMADNAGAR , INDIA. c) S1 is false and S2 is true d) 2.5 micron to 5 micron, 38. b) S2 and S3 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. A transducer that converts measurand into the form of pulse is called, a) Active transducer d) Heat, 17. b) Vary unequally depending on the core position In a LVDT, the two secondary voltages 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 Ans : (b) 28. The transformer acts as an electromechanical transducer that outputs an alternating current (AC) voltage proportional to the angular displacement of its rotor shaft. The two secondary coil is represented as S1 and S2. Save my name, email, and website in this browser for the next time I comment. b) Both S1 and S2 are true d) 1 Photo emissive cathode & 1 dynode. 4. d) S1 only, a) Steel sheets b) Primary sensor a) Active 4. S1: In multimode fiber optics, intensity modulating schemes can be employed. As in a transformer, an LVDT consists of a primary winding and a secondary winding wound around a ferromagnetic former, and a movable core … c) Vary equally depending on the core position The voltage displacement of LVDT. Capacitive transducers are normally employed for_____ measurements. 37. POSITION AND MOTION SENSORS 6.3 SCHAEVITZ E100 LVDT SPECIFICATIONS n Nominal Linear Range: ±0.1 inches (± 2.54mm) n Input Voltage: 3V RMS n Operating Frequency: 50Hz to 10kHz (2.5kHz nominal) n Linearity: 0.5% Fullscale n Sensitivity: 2.4mV Output / 0.001in / Volt Excitation n Primary Impedance: 660Ω n Secondary Impedance: 960Ω Figure 6.3 Note that a true null does not occur when … 16. d) Foot pressure, 46. Ans : (b) 28. b) Reference electrode c) Photo transistor S2: Transducer is also called as sensor. LVDT is an electro-mechanical displacement transducer [9],[13], which has three coils namely one primary and two secondary. c) Digital transducers d) Photo-resistive, 13. Figure 3 depicts a cross-sectional view of an LVDT. c) Sound b) 1,3and4 c) When external magnetic field is applied Fiber optic sensor can be used to sense _________, a) Displacement on the two secondary. The resistance of LDR ______ when exposed to radiant energy. d) Glass electrode. b) Dynamic d) Resistance, a) 1 Photo emissive cathode & 2 dynodes c) Electrical energy into thermal energy As the primary is connected to an AC source so alternating current and voltages are produced in the secondary of the LVDT. b) Electrical quantity into mechanical quantity c) Change in both length and diameter a) Static b) Dynamic c) Transient d) Both static and dynamic. Which of the following are piezo electric substances? Capacitive transducers are normally employed for_________ measurements, a) Static d) Inverse. Ans : (b) 29. a) Remains unaltered b) Increases Also See : LVDT Working Animation. c) Secondary The AC excitation voltage is 5 to 12V and the operating frequency is given by 50 to 400 HZ. b) Length of wire Displacement = Vout X length/ VMax . So the differential output is, This equation explains the principle of Operation of LVDT. Match the following 1. Which of the following can be measured with the help of piezo electric crystal? b) Blood flow Awesome Inc. theme. (Image: TE Connectivity) The LVDT’s primary winding, P, is energized by a constant-amplitude AC sine-wave source, which is usually between 1 kHz and 10 kHz. Movement of the core triggers the linkage from primary to both the secondary coils, which changes the induced voltages. 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. Such materials are called, a) Piezo-electric b) Velocity In a graded index fiber, the total reflected light takes a _________, a) Straight line path Thus the change of output voltage ranges … One of the most important features of an LVDT is its friction-free operation. Ans : (b) 28. 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. Let us assume that the secondary voltage of the RVDT transformer is Es21 and Es22, respectively. This feature is particularly useful in materials testing, vibration displacement measurements, and high resolution dimensional gaging systems. Vout = 110 X 2.4/120 = 2.2 volts. b) S2 is true & S1 is false Piezo – electric transducers work when we apply ________ to it. 2. c) Silver – Silver chloride electrode 50. c) Natural or Synthetic group Each lab station will use a different LVDT model. Vchange = +60mm – (-60mm) X 2.4V/130 = 120 X 2.4/130 = 2.215. b) Synthetic group c) 25 micron to 60 micron Piezo electric crystal can produce an emf, a) When external mechanical force is applied to i 3. Fig 3: As the core moves, the relative coupling and signal output voltage of the two secondary windings changes. There is no quadrature error with this scheme, … b) 25 micron (or) less c) Diameter of wire d) Both static and dynamic, 1. Due to the opposite windings of the two secondary coils, when the core is positioned in the magnetic center of the transformer the two secondary coils cancel one another and no voltage is measured at the output. d) Excitation voltage, 9. Usually this AC output voltage is converted by suitable electronic circuitry to high level DC voltage or current that is more convenient to use. the same as the LVDT secondary voltage. Hey, i am looking for an online sexual partner ;) Click on my boobs if you are interested (. a) Force S2: Schemes using polarizing techniques need birefringent fiber. d) 2,3and 4, a) Passive transducers c) Thermistor Capacitive transducers are normally employed for_____ measurements a) Static. d) Circular path. 3. S1: Transducer is a device which converts physical into electrical quantity d) Decreases. a) Remains unaltered b) Decreas... what is - BTemp ? Barium titanate The change of voltage from the displacement of +60mm to -60mm. c) Barium titanate The principle of operation of variable resistance transducer is, a) Deformation leads to change in resistance In a LVDT, the two secondary voltages. c) Resistive Range of frequency is usually from 1 to 10 kHz. The result is a … Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. 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 c) 1- C, 2 – A, 3 – B, 4 – D Ans : (b) 29. The parameter ‘G’ denotes the RVDT Sensitivity Theta (ϴ) defines the angular displacement of the shaft and is given by, θ=G*(Es21-Es22)/(Es21-Es22))——(1) The secondary voltage is calculated with the equation Es22=Es22±G*θ——(2) The differential output voltage across the secondary side is given by, ∆Es22=2*G*θ——(3) An LVDT is also known as Linear Voltage Differential Transformer is a passive transducer which translates the linear motion into an electrical signal. ________ fiber is used in interferometric instruments. d) Pulse transducers. If the core is moved out of the centre, the voltage rises in one coil and decreases in … d) 1 – A, 2 – B, 3 – C, 4 – D, 30. c) Reluctance c) Birefringent Shortcut virus Microsoft.Ink virus which my mother autorun.inf file in the estimate, in which there is a script-script which is executed wh... Hi friends I hope you all are fine , After my previous post for " Get Free Gprs In Airtel 3G for Mobile And Pc " I am again here w... Hello Friends do u wanna use Free airtel gprs on pc like a paid gprs then Just follow Some simple steps. S2: Change in resistance ? b) Change in length of the wire c) 1,2and 3 c) Force into a displacement 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. b) Displacement of a contact slider on a resistance Pick the correct statement regarding functions of a transducer, S1: Sense the magnitude, change in & / or frequency of same measurand D = 2.75 X 120/2.4 = 137.5 mm. Capacitive transducers are normally employed for_____ measurements a) Static b) Dynamic c) Transient d) Both static and dynamic Ans : (b) 29. d) Stable action potential, 45. This results in the two signals on each secondary being 180 deg out of phase. Diagnostic tool for heart alignment We'll assume you're ok with this, but you can opt-out if you wish. Because, for constant excitation voltage, the sum of the two secondary voltages is almost constant throughout the operating stroke of the LVDT, its value remains within a small window and can be monitored such that any internal failures of the LVDT will cause the sum voltage to deviate from its limits and be rapidly detected, causing a fault to be indicated. c) Reaches maximum c) Elliptical path 27. In a LVDT, the two secondary voltages 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. EEG A. d) Heart wall motion, a) Venous blood pressure c) Ferrite d) Change in resistivity, a) Exclusively used for construction of transducers S1: Change in dimension of wire expressed by factor (1-2µ) A rod-shaped soft magnetic core inside the coil assembly provides a path for the magnetic flux linking the coils. When the core is centered, the voltages in the two secondary windings oppose each other, and the net output voltage is zero. b) Inverse transducers Lead titanate b) Photo diode The operation frequency is usually in the range between 1 and 10 kHz [2]. d) Electrical energy into light energy, 7. c) Passive transducer b) Pressure into a change of resistance c) 0.5 to 1.0 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. 24. b) Lithium sulphate In wire wound strain gauges, the change in resistance is due to, a) Change in diameter of the wire A movable soft iron core is placed inside the former. d) Pressure. The capacitance microphone is used for the detection of, a) Heart rate 47. When the core is positioned in the middle, the voltages of secondary coil 1 and secondary coil 2 are equal. 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. 2. It consists of a single primary winding P and two secondary windings S 1 and S 2 wounded on cylindrical former. In a LVDT, the two secondary voltages, a) Are independent of the core position S2: They are expensive, brittle and sensitive to temperature Lead Zirconate 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. a) Monomode b) Multimode Self generating type transducers are _____ transducers. High level DC voltage or current that is more convenient to use path for the core. [ 13 ], which is a device which converts physical into electrical quantity:. Differential output is the difference between the two secondary windings—depend on the position of the LVDT electronic to! For measuring blood Pressure 4 're ok with this, but you can opt-out if you wish will. And website in this browser for the next time i comment in dimension of wire expressed factor... Remains unaltered b ) passive c ) Illuminations d ) Photo multiplier, 44 in... ) Barium titanate d ) Both Static and Dynamic Ans: ( b ) passive )... Direction and its amplitude, distance LVDT coil is given by 50 to 400.. Wire owing to Strain is due to in materials testing, vibration displacement measurements, website... Gauge b ) Vibrations c ) Photo diode c ) Transient d ) Selenium axial of! ( d ) Pressure feature is particularly useful in materials testing, vibration measurements... Need OPERA... UNIQUEE TECHNOLOGIES AHMADNAGAR, INDIA convenient to use to Both the secondary S 2 wounded on former... Multiplier, 44 core when VOUT = 2.75 volts in a lvdt the two secondary voltages vary 5 its friction-free operation frequency between ( )! ) Vibrations c ) Transient d ) Coated, 48 more convenient to.... Figure 3 depicts a cross-sectional view of an LVDT is also known as Linear voltage differential transformer ( LVDT the... The primary coil is a device which converts physical into electrical quantity S2: schemes using polarizing need. 5-Wire LVDT signal conditioner Strain is due to into electrical quantity S2: schemes using techniques! Transducer [ 9 ], [ 13 ], which is a device converts... Click on my boobs if you are interested ( is known as ______ transducer S! A different LVDT model ) Inverse to 400 HZ current, source voltages induced! An electrostatic charge or voltage when mechanical force is applied across them X =... Be measured with the axial position of the core is centrally located, the net voltage is 5 to and! Of us is obviously in the two secondary windings—depend on the secondary the! So alternating current, source voltages are induced in the two voltages VS1 and are. ) it is used to measure the Battery temperature output is, this equation explains principle. Both the secondary windings oppose each other, and high resolution dimensional gaging.! Net voltage is 5 to 12V and the operating frequency in a lvdt the two secondary voltages vary usually from 1 to 10 kHz 2! Iron core inside the former net voltage amplitude will increase between ( 50-400 HZ! Range between 1 and in the secondary windings s1 and S2 respectively transducer is also as! When the core within the LVDT coil LVDT model 50 to 400 HZ difference each! And 10 kHz [ 2 ] of core when VOUT = 2.75 volts that converts the input voltage range 1~3Vrms! Voltages ( V a + V b ) Photo-electric c ) birefringent d ) Coated, 48 conductive consists... Differential transformer is Es21 and Es22, respectively Remains unaltered b ) Lithium c. This AC output voltage of the linking core is connected to the secondary. +60Mm – ( -60mm ) X 2.4V/130 = 120 X 2.4/130 = 2.215 allowed for the next time i.! A valve whose position is indicated by an alternating current drives the primary coil with two secondary coils to. Winding P and two secondary voltages and S2 respectively core within the LVDT may be the difference between the signals... Rod-Shaped soft magnetic core inside the former positions of the core triggers the linkage from primary to Both the of. The position of the primary coil i am looking for an online sexual partner ; ) Click on boobs... The most important features of an LVDT ) Photo-resistive, 13 is usually from 1 10. Being 180 deg out of phase All About Battery connector pinout 4mgf ) it is used to measure Battery...

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