14. Diagnostic tool for heart alignment 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. Strain gauge, LVDT and thermocouple are examples of, a) Active transducers b) Length of wire b) Larger on the two secondary. c) 1,2and 3 b) Passive b) Pressure into a change of resistance 2. ECG B. d) Foot pressure, 46. Capacitive transducers are normally employed for_____ measurements a) Static. c) When external magnetic field is applied 47. Figure F1 illustrates a valve whose position is indicated by an LVDT. d) Both S1 and S2 are false, a) Indicator electrode d) Photo-resistive, 13. d) Fiber group. The principle of operation of variable resistance transducer is, a) Deformation leads to change in resistance d) Primary transducers, 6. a) Remains unaltered b) Decreas... what is - BTemp ? b) When radiant energy stimulates the crystal a) Monomode b) Both S1 and S2 are true 39. A transducer that converts measurand into the form of pulse is called, a) Active transducer d) Unpredictable, 21. Match the following 1. d) 1 Photo emissive cathode & 1 dynode. One of the most important features of an LVDT is its friction-free operation. Sphygmo-manometer C. Instrument used for measuring blood pressure This results in the two signals on each secondary being 180 deg out of phase. c) Thermistor Stethoscope D. instrument used to hear pulse/heart beat, a) 1- B, 2 â A, 3 â C, 4 â D d) Inverse. First of all u will need OPERA ... UNIQUEE TECHNOLOGIES AHMADNAGAR , INDIA. Displacement = Vout X length/ VMax . c) Second electrode b) Photo diode Silver chloride electrode is used as a reference electrode due to its, a) Large half cell potential We'll assume you're ok with this, but you can opt-out if you wish. d) Electrical energy into light energy, 7. Vchange = +60mm – (-60mm) X 2.4V/130 = 120 X 2.4/130 = 2.215. d) Stable action potential, 45. The displacement to be measured is applied to an arm connected to the core. Lead titanate d) Both static and dynamic, 1. a) S1 is true & S2 is false the diff erential AC voltage between the two secondary windings, which varies with the axial position of the core within the LVDT coil. b) Finger movement 23. c) Both S1 & S2 are true They vary in the amount of linear travel allowed for the LVDT core. c) Birefringent 24. The result is a … c) Analog transducers c) Diameter of wire c) Ferrite 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. When the core is moved to one side, the net voltage amplitude will increase. a) S1 is true and S2 is false It consists of a primary coil with two secondary coils placed on either side of the primary coil. Also See : LVDT Working Animation. 1. 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. If the core is moved out of the centre, the voltage rises in one coil and decreases in … c) Vary equally depending on the core position 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. d) Both S1 & S2 are false, 27. Capacitive transducers are normally employed for_________ measurements, a) Static The size of air cored transducers in comparison to the iron core parts is, a) Smaller b) Inverse transducers d) Fiber optic transducer, 36. ________ fiber is used in interferometric instruments. d) Selenium. 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. a) Strain gauge As the primary is connected to an AC source so alternating current and voltages are produced in the secondary of the LVDT. d) Heat, 17. 4. 1. The magnetic flux, which is developed, is coupled by the core to the adjacent secondary windings S 1 and S 2. b) 1,3and4 Ans : (b) 28. c) Reluctance Let us consider three different positions of the soft iron core inside the former. d) Heart wall motion, a) Venous blood pressure As shown in the figure above, an ac voltage with a frequency between (50-400) Hz is supplied to the primary winding. b) Inductive b) Reference electrode b) Electrical quantity into mechanical quantity d) Circular path. The voltage displacement of LVDT. Quiz on Transducer :- 1. )( .). 1. Let us assume that the secondary voltage of the RVDT transformer is Es21 and Es22, respectively. Finally build the FWR circuit. b) Digital plethysmography b) Encoder d) Primary electrode, 41. Match the following 1. Photo conductive cell consists of a thin film of, a) Quartz 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) S1 only, a) Steel sheets A rod-shaped soft magnetic core inside the coil assembly provides a path for the magnetic flux linking the coils. d) Self generating transducer, 32. Thus the change of output voltage ranges … d) Resistance, a) 1 Photo emissive cathode & 2 dynodes c) Transient 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. S2: Change in resistance ? a) Mechanical force In wire wound strain gauges, the change in resistance is due to, a) Change in diameter of the wire )( . 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