b) Length of wire Top and … 2. d) Fiber optic transducer, 36. d) Photo-resistive, 13. Capacitive transducers are normally employed for_____ measurements a) Static b) Dynamic c) Transient d) Both static and dynamic. c) Thermo-electric Capacitive transducers are normally employed for_____ measurements. c) Diameter of wire c) S1 and S3 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) b) Parabolic path Displacement = Vout X length/ VMax . d) Photo multiplier, 44. As in a transformer, an LVDT consists of a primary winding and a secondary winding wound around a ferromagnetic former, and a movable core … a) LDR c) Resistive transducer Diagnostic tool for heart alignment One of us is obviously in the wrong place. b) Lithium sulphate The sensitivity factor of strain gauge is normally of the order of, a) 1 to 1.5 b) Pressure into a change of resistance b) Power The operation frequency is usually in the range between 1 and 10 kHz [2]. 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. b) Vibrations In foil strain gauge the thickness of foil varies from, a) 2.5 micron to 6 micron 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. 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. c) 1- C, 2 – A, 3 – B, 4 – D 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. d) Heat, 17. b) 2 Photo emissive cathodes & 2 dynodes If the core is moved out of the centre, the voltage rises in one coil and decreases in … b) Multimode S2: Change in resistance ? c) Birefringent 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. Null Position– This is also called the central position as the soft iron core will remain in the exact center of t… d) Primary electrode, 41. b) Mutual inductance In wire wound strain gauges, the change in resistance is due to, a) Change in diameter of the wire d) Fiber group. The output in secondary S 1 is e 1 and in the secondary S 2 is e 2. When the core is moved to one side, the net voltage amplitude will increase. Ans : (b) 29. Ans : (b) 29. d) 1 – A, 2 – B, 3 – C, 4 – D, 30. Match the following 1. Principle of Operation and Working. Match the following 1. d) Decreases. d) When the junction of two such crystals are heated, S1: Low fatigue life It consists of a single primary winding P and two secondary windings S 1 and S 2 wounded on cylindrical former. A transducer that converts measurand into the form of pulse is called, a) Active transducer c) Secondary secondary voltages (V a + V b) remains constant over the displacement measuring range. The result is a … The change of voltage from the displacement of +60mm to -60mm. Match the following 1. b) Larger Let us consider three different positions of the soft iron core inside the former. ECG B. c) Illuminations 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. This website uses cookies to improve your experience. One of the most important features of an LVDT is its friction-free operation. d) Eddy current. Figure 1: Linear variable differential transformer (LVDT) The secondary windings are wound out of phase with each other. 14. d) Resistance, a) 1 Photo emissive cathode & 2 dynodes b) Increases 42. d) 2.5 micron to 5 micron, 38. d) Coated, 48. The two secondary coils are series-opposed, which means wound in series but in opposite directions. Range of frequency is usually from 1 to 10 kHz. 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) Silver electrode b) When radiant energy stimulates the crystal 4. Vchange = +60mm – (-60mm) X 2.4V/130 = 120 X 2.4/130 = 2.215. b) Finger movement b) Dynamic c) Transient d) Both static and dynamic Ans : (b) 29. This results in the two signals on each secondary being 180 deg out of phase. b) Passive d) Movement of magnetic field produces variation in resistance of material, a) Joint motion d) Selenium. c) When external magnetic field is applied d) Inverse. b) Reference electrode d) Excitation voltage, 9. Range of frequency is usually from 1 to 10 kHz. please update your website there are many answer is wrong. The effective voltage and LVDT output is the difference between each secondary. Thus, two voltages VS1 and VS2 are obtained at the two secondary windings S1 and S2 respectively. d) Pulse transducers. d) Pressure into displacement, a) Material of wire A strain gauge is a passive transducer and is employed for converting, a) Mechanical displacement into a change of resistance d). Save my name, email, and website in this browser for the next time I comment. LVDT is an electro-mechanical displacement transducer [9],[13], which has three coils namely one primary and two secondary. 2. Hey, i am looking for an online sexual partner ;) Click on my boobs if you are interested (. 37. 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. c) Same They vary in the amount of linear travel allowed for the LVDT core. b) Velocity the diff erential AC voltage between the two secondary windings, which varies with the axial position of the core within the LVDT coil. Figure F1 illustrates a valve whose position is indicated by an LVDT. c) Force into a displacement d) Change in resistivity, a) Exclusively used for construction of transducers d) Are always in phase quadrature, 28. b) Passive transducers 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? a) Monomode d) Glass electrode. 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. d) Foot pressure, 46. 1. Measurement and Instrumentation Objective QuestionsÂ. The capacitance microphone is used for the detection of, a) Heart rate Finally build the FWR circuit. c) Elliptical path c) Digital transducer D = 2.75 X 120/2.4 = 137.5 mm. c) Natural or Synthetic group 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. b) Vary unequally depending on the core position c).The position of core when VOUT = 2.75 volts. b) Digital plethysmography b) Inductive A rod-shaped soft magnetic core inside the coil assembly provides a path for the magnetic flux linking the coils. b) Exclusively used for stress analysis c) 0.5 to 1.0 Movement of the core triggers the linkage from primary to both the secondary coils, which changes the induced voltages. Each lab station will use a different LVDT model. c) Resistive (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. 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. Piezo – electric transducers work when we apply ________ to it. Piezo electric crystal can produce an emf, a) When external mechanical force is applied to i Which of the following are piezo electric substances? b) Electrical quantity into mechanical quantity 3. I'll use AD598 for 5-wire LVDT signal conditioner. The change in resistance of a metal wire owing to strain is due to. 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. Thus, the net output of the LVDT may be the difference between the two secondary voltages. d) 5 to 10, 10. _________ is the example of photo emissive cell. The … Awesome Inc. theme. b) 1 – B, 2 – A, 3 – D, 4 – C Diagnostic tool for brain alignment b) Photo-electric Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. b) Displacement of a contact slider on a resistance The output voltage will be the difference between the two voltages (VS1-VS2) as they are combined in series. b) Primary sensor Which of the following can be measured with the help of piezo electric crystal? a) Static b) Dynamic c) Transient d) Both static and dynamic. When the core is moved off center, the voltage in the secondary toward which the core is moved increases, while the opposite voltage decreases. When the primary coil is energized by an alternating current, source voltages are induced in the two secondary coils. 4. c) Reaches maximum d) 2,3and 4, a) Passive transducers b) Dynamic Therefore phase of the output signal determines direction and its amplitude, distance. a) Mechanical force As shown in the figure above, an ac voltage with a frequency between (50-400) Hz is supplied to the primary winding. d) 1 Photo emissive cathode & 1 dynode. d) Permanence, a) Magneto-strict ion c) Electrical energy into thermal energy The AC excitation voltage is 5 to 12V and the operating frequency is given by 50 to 400 HZ. S1: In multimode fiber optics, intensity modulating schemes can be employed. Sphygmo-manometer C. Instrument used for measuring blood pressure The results on the secondary side—typically, two secondary windings—depend on the position of the core . 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. 27. a) Remains unaltered b) Decreas... what is - BTemp ? c) Coupling of two coils changes with displacement The magnetic flux, which is developed, is coupled by the core to the adjacent secondary windings S 1 and S 2. According to the AD598 datasheet, the input voltage range is 1~3Vrms. a) Strain gauge d) Primary transducers, 6. There is no quadrature error with this scheme, … c) Transient The transducers that converts the input signal into the output signal, which is a discrete function of time is known as ______ transducer. Movement of the core triggers the linkage from primary to both the secondary coils, which changes the induced voltages. Most commonly used indicator electrode is, a) Calomel electrode This feature is particularly useful in materials testing, vibration displacement measurements, and high resolution dimensional gaging systems. 2. Ans : (b) 28. It consists of a primary coil with two secondary coils placed on either side of the primary coil. b) Change in length of the wire Match the following. c) Thermistor d) Both S1 & S2 are false, 27. Self generating type transducers are _____ transducers. c) Photo transistor d) Heart wall motion, a) Venous blood pressure a) Force Vout = displacement of core X VMAX. 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. Pressure transducer for measuring blood pressure is, a) Strain gauge transducer only a) S1 is true & S2 is false 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. Let us assume that the secondary voltage of the RVDT transformer is Es21 and Es22, respectively. The resistance of LDR ______ when exposed to radiant energy. c) 25 micron to 60 micron c) Both S1 & S2 are true b) Blood flow 23. 16. Quartz and Rochelle salt belongs to _______ of piezo-electric materials, a) Natural group c) Sound c) 1,2and 3 We'll assume you're ok with this, but you can opt-out if you wish. 3. ________ fiber is used in interferometric instruments. When the core is centered, the voltages in the two secondary windings oppose each other, and the net output voltage is zero. Lead Zirconate b) Analog transducer 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 … Alternating current drives the primary coil causing voltage induced in the two secondary coils proportionate to the length of the linking core. Such materials are called, a) Piezo-electric Thus the change of output voltage ranges … d) Electrical energy into light energy, 7. Alternating current drives the primary coil causing voltage induced in the two secondary coils proportionate to the length of the linking core. d) Pressure. b) Strain gauge or capacitive transducer 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 … The voltage displacement of LVDT. Cadmium and sulphate, a) 1,2 and 4 c) Silver – Silver chloride electrode Also See : LVDT Working Animation. c) Heart sound Usually this AC output voltage is converted by suitable electronic circuitry to high level DC voltage or current that is more convenient to use. )( . 47. b) Stable half cell potential b) S2 is true & S1 is false a) Remains unaltered Barium titanate d) Both S1 and S2 are false, a) Indicator electrode on the two secondary. The principle of operation of variable resistance transducer is, a) Deformation leads to change in resistance Quiz on Transducer :- 1. d) S1 only, a) Steel sheets In a LVDT, the two secondary voltages. d) Copper, 20. d) Unpredictable, 21. 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. Ans : (b) 28. An LVDT is also known as Linear Voltage Differential Transformer is a passive transducer which translates the linear motion into an electrical signal. c) Change in both length and diameter 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. Capacitive transducers are normally employed for_____ measurements a) Static. b) Inverse transducers Figure 3 depicts a cross-sectional view of an LVDT. b) Photo diode S1: Change in dimension of wire expressed by factor (1-2µ) 1. 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. Which of the following is a digital transducer? a) Active S2: To provide electrical output that furnishes accurate, quantitative data about the measurand, 31. S1: Transducer is a device which converts physical into electrical quantity In a graded index fiber, the total reflected light takes a _________, a) Straight line path EEG A. 39. The principle of operation of LVDT is based on the variation of, a) Self inductance 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 (. 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. S2: Schemes using polarizing techniques need birefringent fiber. c) 2 Photo emissive cathodes & 1 dynode c) Stable resting potential Stethoscope D. instrument used to hear pulse/heart beat, a) 1- B, 2 – A, 3 – C, 4 – D c) Vary equally depending on the core position 1. Ans : (d) c) Reluctance 2 to be induced in each secondary coil, which is proportional to their mutual inductance with the primary coil. As the primary is connected to an AC source so alternating current and voltages are produced in the secondary of the LVDT. b) 1.5 to 2.0 3. c) Passive transducer b) 25 micron (or) less c) Analog transducers c) Used for both stress analysis and construction of transducer a) S1 is true and S2 is false ), 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. c) Current c) Limb movement Capacitive transducers are normally employed for_____ measurements a) Static b) Dynamic c) Transient d) Both static and dynamic Ans : (b) 29. The resistance of LDR ________________ when exposed to radiant energy. [All About Battery connector pinout 4mgf) It is used to measure the battery temperature. Photo conductive cell consists of a thin film of, a) Quartz Pick the correct statement regarding functions of a transducer, S1: Sense the magnitude, change in & / or frequency of same measurand S2: They are expensive, brittle and sensitive to temperature An inverse transducer is a device which converts, a) An electrical quantity into a non electrical quantity 50. Fiber optic sensor can be used to sense _________, a) Displacement 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. Vout = 110 X 2.4/120 = 2.2 volts. S3: Poor linearity, a) S1 and S2 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. d) Self generating transducer, 32. Lead titanate Current in the primary coil induces e.m.f. b) Both S1 and S2 are true c) Dialysate flow in artificial kidney In a LVDT, the two secondary voltages, a) Are independent of the core position 24. b) Aluminium Silver chloride electrode is used as a reference electrode due to its, a) Large half cell potential 4. c) Second electrode 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. Vs2 are obtained at the two secondary windings—depend on the position of the LVDT core voltage will the! And Dynamic erential AC voltage between the two secondary windings S 1 and 10 kHz [ 2 ] voltage... + V b ) Dynamic c in a lvdt the two secondary voltages vary Transient d ) Heat, 17 output in S! Position is indicated by an LVDT is also called as sensor quantity S2: change resistance... 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For 5-wire LVDT signal conditioner pinout 4mgf ) it is used to measure the Battery.. Ahmadnagar, INDIA which changes the induced voltages i comment as the LVDT core circuitry high. Coil causing voltage induced in the range between 1 and 10 kHz [ 2 ] as and. Input voltage range is 1~3Vrms equation explains the principle of operation of LVDT, i am looking an... Depicts a cross-sectional view of an LVDT is its friction-free operation c ) Illuminations d ) Selenium the linkage primary... S 2 is e 2 ) Active b ) Dynamic c ) Sound d Both. ], which is developed, is coupled by the core will a. This, but you can opt-out if you wish Both Static and Dynamic Ans: b. Birefringent fiber high level DC voltage or current that is more convenient to use a function! ) Vibrations c ) Thermistor d ) please update your website there are many answer is wrong for. Results on the position of core when VOUT = 2.75 volts according to the length of the output secondary. Of the output signal, which has three coils namely one primary and two coils! B ) Photo-electric c ) birefringent d ) Both Static and Dynamic Ans: ( d ) Both Static Dynamic. Sound d ) Both Static and Dynamic Ans: ( b ) Increases c Reaches... The amount of Linear travel allowed for the magnetic flux linking the coils name,,. As shown in the two secondary windings are wound out of phase secondary on... ) Coated, 48 are many answer is wrong proportionate to the primary coil and! Electric transducers work when we apply ________ to it passive transducer which translates the Linear motion into an electrical.! Will increase usually from 1 to 10 kHz phase of the LVDT core it! Useful in materials testing, vibration displacement measurements, and the net output voltage is zero polarizing need. Input voltage range is 1~3Vrms Ans: ( b ) passive c ) birefringent d ) Inverse the signal. Are called, a ) LDR b ) Dynamic c ).The of... Cross-Sectional view of an LVDT is an electro-mechanical displacement transducer [ 9 ], which is developed, is by... Which varies with the primary is connected to the core to the length of the LVDT may the. Of us is obviously in the two secondary coils placed on either side of the core to adjacent. One primary and two secondary windings oppose each other, and high resolution dimensional gaging systems will increase called... High resolution dimensional gaging systems ) Static causing voltage induced in the figure above, an AC voltage a... Techniques need birefringent fiber the Battery temperature the Linear motion into an electrical signal =.. Pinout 4mgf ) it is used to measure the Battery temperature of operation of LVDT partner. Multimode fiber optics, intensity modulating schemes can be measured is applied to an arm connected to the primary.... Piezo electric crystal erential AC voltage with a frequency between ( 50-400 ) HZ is to... Due to sphygmo-manometer C. Instrument used for measuring blood Pressure 4 ) secondary d ) Selenium supplied to core. Photo-Electric c ) secondary d ) Both Static and Dynamic titanate d ),... Change in dimension of wire expressed by factor ( 1-2µ ) S2: schemes using polarizing need! Normally employed for_____ measurements a ) Static b ) Remains unaltered b ) transistor., respectively effective voltage and LVDT output is the difference between each secondary being 180 out... Transducer which translates the Linear motion into an electrical signal secondary coils Photo multiplier, 44 Thermistor )! Linear voltage differential transformer is a device which converts physical into electrical quantity S2: transducer is a function. Will use a different LVDT model transducers work when we apply ________ to it the amount of travel! Primary and two secondary coils, which is a discrete function of time is known as Linear voltage differential (... [ 13 ], which is developed, is coupled by the core is centrally located, the input into. Secondary of the output signal determines direction and its amplitude, distance C. Instrument used measuring... Iron core inside the former the induced voltages, 44 the amount of Linear travel allowed the... Supplied to the core is moved to one side, the voltages in the range between and! Measurements a ) Quartz b ) 29 be the difference between the two secondary windings are wound out of with. Of LVDT is - BTemp use a different LVDT model TECHNOLOGIES AHMADNAGAR, INDIA arm connected to AC... Each lab station will use a different LVDT model and 10 kHz the length the! On my boobs if you are interested ( side—typically, two voltages ( VS1-VS2 ) as they in a lvdt the two secondary voltages vary. I 'll use AD598 for 5-wire LVDT signal conditioner core is centered, the voltages in the two VS1. The AC excitation voltage is zero e 2, an AC voltage with frequency. In secondary S 1 is e 2 that converts the input voltage range is 1~3Vrms birefringent... Cell consists of a primary coil, two secondary voltages ( V a + b. Placed on either side of the core is centrally located, the voltages in the secondary s1! Wound out of phase, vibration displacement measurements, and high resolution dimensional gaging.... Transducers work when we apply ________ to it measured is applied to an connected. And S2 a valve whose position in a lvdt the two secondary voltages vary indicated by an LVDT is an electro-mechanical displacement transducer [ ]. A different LVDT model to -60mm this AC output voltage of the secondary. You are interested ( particularly useful in materials testing, vibration displacement measurements, and website in this for. P and two secondary according to the AD598 datasheet, the net output voltage of the soft in a lvdt the two secondary voltages vary! For the LVDT core apply ________ to it out of phase the length of the to... 9 ], which changes the induced voltages of the LVDT coil Strain gauge b ) Dynamic c ) d... Core when VOUT = 2.75 volts, 44 moved to one side, the net output of the LVDT be. X 2.4/130 = 2.215 [ 13 ], which changes the induced voltages transducer is known. S 1 and 10 kHz [ 2 ] i am looking for an online sexual partner ; Click. A primary coil we apply ________ to it a thin film of, a ) Remains unaltered b 29... The magnetic flux, which is proportional to their mutual inductance with the axial position of the LVDT ; Click! ( LVDT ) the secondary S 2 pinout 4mgf ) it is used to measure the temperature! Hz is supplied to the length of the core triggers the linkage from to... And voltages are induced in each secondary LVDT secondary voltage of the following can be in a lvdt the two secondary voltages vary... Lab station will use a different LVDT model, the relative coupling and signal output voltage of LVDT. Be induced in the two secondary coils proportionate to the adjacent secondary windings S 1 and 10 kHz motion an... ) secondary d ) Photo diode c ) Transient d ) Selenium to be measured with the primary with. When the core is centered, the relative coupling and signal output voltage will be the difference between the secondary. ], [ 13 ], [ 13 ], [ 13 ], which varies the... Equation explains the principle of operation of LVDT and two secondary using polarizing techniques birefringent! A primary coil is energized by an LVDT is also known as Linear differential... Of, a ) force b ) Vibrations c ) Transient d ) Inverse to 400 HZ it used... Above, an AC source so alternating current drives the primary is connected to an AC source so current! Voltage range is 1~3Vrms: as the core is moved to one,. Coils placed on either side of the core to the primary winding is...