d) camera attached stereomicroscope. a) Pure conductors This led to the understanding (second level) that an intrinsic material property like resistivity (or conductivity) is required that is not influenced by the particular geometry of the sample. Primary concerns are (1) ohmic contact quality and size, (2) sample uniformity and accurate thickness determination, (3) thermomagnetic effects due to nonuniform temperature, and (4) photoconductive and photovoltaic effects which can be minimized by measuring in a dark environment. d) Metals Examples of Van der Pauw configurations are shown in figure 2. In the early 1800s, the resistance R and conductance G were treated as measurable physical quantities obtainable from two-terminal I-V measurements (i.e., current I, voltage V). D. All. To measure the Hall voltage VH, a current I is forced through the opposing pair of contacts 1 and 3 and the Hall voltage VH (= V24) is measured across the remaining pair of contacts 2 and 4. a) Magnetic field Finally, one must accurately measure sample temperature, magnetic field intensity, electrical current, and voltage. The Hall effect can be used to measure the average drift velocity of the charge carriers by mechanically moving the Hall probe at different speeds until the Hall voltage disappears, showing that the charge carriers are now not moving with respect to the magnetic field. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. A sign of, uh, charge of the ions. The Hall effect is the production of a voltage difference across an electrical conductor, transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current. Which of the following represents correct expression for Lorentz force? a) Wein bridge b) Maxwell bridge c) Schering bridge d) Anderson bridge Ans: (b) 176. 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E. H. Putley, The Hall Effect and Related Phenomena, Butterworths, London (1960). b) Half A. E. H. Hall, "On a New Action of the Magnet on Electrical Current," Amer. n or p type is very important. If the measurement apparatus is set up as shown, the Hall voltage is negative for n-type semiconductors and positive for p-type semiconductors. Force exerted by magnetic field in Hall Effect transducers is ____________ A. a) EH/b When an electron moves along a direction perpendicular to an applied magnetic field, it experiences a force acting normal to both directions and moves in response to this force and the force effected by the internal electric field. C. Carrier concentration. Which of the following represents the output of Hall Effect transducer? D. C. Look, Electrical Characterization of GaAs Materials and Devices, John Wiley & Sons, Chichester (1989). In order to determine both the mobility µ and the sheet density ns, a combination of a resistivity measurement and a Hall measurement is needed. The instrument used to draw clear magnified sketches of objects under microscope is . d) Ionizing The voltage or electric field produced due to the application of magnetic field is also referred to as Hall voltage or Hall field. Your name: Your Email: Your Comments: 39. Utilizing the Hall effect to measure blood flow. Calculating the Hall emf: Hall Effect for Blood Flow Figure 3 above shows how this is done. Figure 26: Hall effect for positive charge carriers (left) and negative charge carriers (right). Increasing the temperature coefficient C. Increasing the susceptibility of measuring instrument D. Decreasing the frequency of recalibration Answer-D. 4.Moving coil instrument, having coil resistance of 4.5Ω gives a full scale deflection of 30 mA. Impulse voltage. To obtain the two characteristic resistances, one applies a dc current I into contact 1 and out of contact 2 and measures the voltage V43 from contact 4 to contact 3. (a) Does the sign of the ions … Which of the following represents the correct expression of Lorentz force? Um, And in here, the sign of the charge. D. L. Rode, "Low-Field Electron Transport," Semiconductors & Semimetals. This chapter cannot by its nature be all inclusive, but should stimulate ideas on the many additional ways Hall effect technology can be applied. In addition, the ohmmeter may also be used to determine the condition of semiconductor devices such as diodes and transistors. If the conducting layer thickness d is known, one can determine the bulk resistivity (r = RSd) and the bulk density (n = nS/d). b) False Please let us know if you agree to functional, advertising and performance cookies. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. (C) Wattmeter. Electrical characterization of materials evolved in three levels of understanding. We use cookies to give you the best online experience. This quiz contains practice questions for Measurement Of Physical Quantities (O Level).There are explanations for some of the questions after you submit the quiz. c) eV Sanfoundry Global Education & Learning Series – Instrumentation Transducers. Also, the sample lateral dimensions must be large compared to the size of the contacts and the sample thickness. If a material with a known density of charge carriers n is placed in a magnetic field and V is measured, then the field can be determined from Equation 11.29. Online Questions and Answers Topic Outline. As a result, the DC magnetic flux can be measured, and the DC current in the conductor can be calculated. Hall Effect was discovered by Edwin Hall in 1879. This manual may be used in a number of ways. May 18, 2017 by admin « Back CONTENTS Next » 1. 5 Points. The Lorentz force is given by, The Hall effect is illustrated in figure 1 for a bar-shaped sample in which charge is carried by electrons. d) None of the mentioned 7 people answered this MCQ question is the answer among for the mcq Hall's effect can be used to measure 2. The errors due to instruments being out of calibration can be rectified by A. d) Lorentz Voltage Creeping in energy metre implies (A) slow rotation of rotor with only voltage coil excited. There is a more detailed discussion on this area on the carrier type page. The hall effect element is a type of transducer used for measuring the magnetic field by converting it into a voltage. Since the electrons are travelling through a magnetic field, they are subject to an upwards Lorentz force and so drift to the top of the bar whilst maintaining their horizontal motion. Hall Effect transducer can be used to measure ___________ This phenomenon is known as Hall Effect. 3. a) Compound microscope. D. None of the above View Answer. No negative points for wrong answers. Um, it is not, Does not Our doesn't influence the magnitude of e l f. In other words, some the value of voltage. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. The Hall effect can be used also to measure the density of current carriers, their freedom of movement, or mobility, as well as to detect the presence of a current on a magnetic field. Directionality of the IMF. Each question carries 1 point. You need to score at-least 50% to pass the quiz i.e. Other types of investigations of carrier behavior are studied in the quantum Hall effect. High frequency and impulse currents are measured using: Inductive elements; Hall effect devices; Faraday effect devices; All of these; Correct answer: 4. Sphere gap is used to measure: AC Voltage; DC Voltage; Both of these; None of these; Correct answer: 3. Repts. Join our social networks below and stay updated with latest contests, videos, internships and jobs! The Lorentz force is given by The Hall effect is illustrated in figure 1 for a bar-shaped sample in which charge is carried by elec… High Voltage Engineering MCQ. R. Chwang, B. J. Smith and C. R. Crowell, "Contact Size Effects on the van der Pauw Method for Resistivity and Hall Coefficient Measurement," Solid-State Electronics. We prepared the Hall Effect Transducers Multiple Choice Questions for your practice. Theories of electrical conduction were constructed with varying degrees of success, but until the advent of quantum mechanics, no generally acceptable solution to the problem of electrical transport was developed. The Hall effect can be used to measure fluid flow in any fluid having free charges, such as blood. a) A b) B c) C d) D Ans: (c) 175. c) eEH View Answer, 10. J. View Answer, 8. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers . L. J. van der Pauw, "A Method of Measuring the Resistivity and Hall Coefficient on Lamellae of Arbitrary Shape," Philips Tech. Q.6 hall generators are normally used to measure. Explanation: Hall Effect transducers can be used to measure linear and angular displacement and magnetic field etc. Total radiation pyrometers are used to measure temperature in the range 700°C to 2000°C. Math. The Hall effect can be used to measure magnetic fields. The sheet resistance RS of the semiconductor can be conveniently determined by use of the Van der Pauw resistivity measurement technique. Figure 3. Later, it became obvious that the resistance alone was not comprehensive enough since different sample shapes gave different resistance values. Automotive fuel level indicator. The Hall sensor is used in some automotive fuel level indicators. C. Any type of impulse voltage. L. J. van der Pauw, "A Method of Measuring Specific Resistivity and Hall Effect of Discs of Arbitrary Shapes," Philips Res. It presents a number of ways to use Hall effect sensors to per-form a sensing function. This can either be … a) True MCQ on Measuring Instruments – 1. (B) Voltmeter. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. It was discovered by Edwin Hall in 1879. 3, can also be used for the Hall measurement. Figure 2. b) eEH/b The basic physical principle underlying the Hall effect is the Lorentz force. d) All of the mentioned For the first time, this allowed scientists to quantify the current-carrying capability of the material and carry out meaningful comparisons between different samples. C. Disc. Which of the following meter is an integrating type instrument? Which of the following is true about dark field microscopy? D. Coaxial tubular. This leads to a build up of negative charge on one side of the bar and positive charge on the other due to the lack of electrons. Once the Hall voltage VH is acquired, the sheet carrier density ns can be calculated via ns = IB/q|VH| from the known values of I, B, and q. The direct measurement of the magnetic field is not possible. Hall potential is inversely proportional to magnetic flux density. There are practical aspects which must be considered when carrying out Hall and resistivity measurements. a) True d) No proportionality a) BeV A Hall effect can also occur across a void or hole in a semiconductor or metal plate, when current is injected via contacts that lie on the boundary or edge of … a) Double View Answer, 5. Which of the following bridge will be used to measure the low values of resistance? Q5. a) Adding disc called ‘stop’ to the condenser will make bright field to dark filed. b) Magnetic You can get the Quiz Answers after submitting all quiz questions. 2 Pressure Measurement Multiple Choice Questions and Answers for competitive exams. (B) slow rotation of rotor with only current coil excited. Q.7 for measuring high impulse currents, the best type of shunt is. which will improve your skill. A Hall effect transducer measuring small distances. Hall Effect transducers attain equilibrium instantaneously. Carvey hall. b) Light microscope. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers. d) Electric force Next, one applies the current I into contact 2 and out of contact 3 while measuring the voltage V14 from contact 1 to contact 4 using a geometry shown in figure 3. The transducer converts the magnetic field into an electric quantity which is easily measured by the analogue and digital meters. c) Linear displacement B. d) B This leads to a potential difference between the two sides of the sample, that can be measured as the Hall voltage VH. c) Super conductors a) True b) False Ans: (a) 174. These short objective type questions with answers are very important for Board exams as well as competitive exams. Since sheet resistance involves both sheet density and mobility, one can determine the Hall mobility from the equation. c) camera lucida. The Hall voltage measurement consists of a series of voltage measurements with a constant current I and a constant magnetic field B applied perpendicular to the plane of the sample. Ballastic galvanometer can be used to measure the mutual inductance. One then obtains the equation, Thus, by measuring the Hall voltage VH and from the known values of I, B, and q, one can determine the sheet density ns of charge carriers in semiconductors. D. K. Schroder, Semiconductor Material and Device Characterization, 2nd Edition, John Wiley & Sons, New York (1998). Hall Effect is a/an _____________ Rev. Moving iron instruments can be used (a) To measure dc currents only (b) To measure ac currents only (c) To measure a.c. voltage only (d) To measure a.c. and d.c. currents and voltage. This led to the definitions of carrier density n and mobility µ (third level of understanding) which are capable of dealing with even the most complex electrical measurements today. 1. Van der Pauw demonstrated that there are actually two characteristic resistances RA and RB, associated with the corresponding terminals shown in Fig. Clearly, it is possible to determine the sign of the mobile charges in a current carrying conductor by measuring the Hall voltage. All the Best. (II) The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. 3) A 1/3 digit voltmeter having a resolution of 100Mv can be used to measure maximum voltage of. Answer d. Don’t Miss : Alternator Interview Questions. Answer b . This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on ” Hall Effect Transducers”. MCQ in BJT Amplifiers; MCQ in Amplifier Operation; MCQ in Transistor AC Models The basic physical principle underlying the Hall effect is the Lorentz force. Calibration of instrument is an important consideration in measurement system. B. Bifilar strip. Coronavirus (Covid-19): Latest updates and information, http://en.wikipedia.org/wiki/File:VanderPauwContactPlacement.jpg. The Hall effect was used to detect DC current in a superconducting DC transformer also. Former method can be used for AC only and the later method can be used for both AC and DC Former method can be used for DC only and the later method can be used only for AC Ans. Whena magnetic field is applied to a current carrying conductor in a direction perpendicular to that of the flow of current, a potential differenceor transverse electric field is created across a conductor. In Hall effect, the output voltage produced across the crystal is due to. D. L. Rode, C. M. Wolfe and G. E. Stillman, "Magnetic-Field Dependence of the Hall Factor for Isotropic Media," J. Appl. At equilibrium Lorentz forces will be ____________ of Hall Effect force. "Standard Test Methods for Measuring Resistivity and Hall Coefficient and Determining Hall Mobility in Single-Crystal Semiconductors," ASTM Designation F76, Annual Book of ASTM Standards, Vol. View Answer, 4. A. (D) Energy metre. Used to measure resistance. c) Magnetic force Figure 1: Illustration of the Hall effect in a bar of conducting material. a) 100 V. b) 200 V. c) 1000 V. d) 5000 V b) Semiconductors Electric field intensity. no holes or nonconducting islands or inclusions), thin-plate sample containing four very small ohmic contacts placed on the periphery (preferably in the corners) of the plate. 10. a) Electronic (A) Ammeter. (Note that the force on holes is toward the same side because of their opposite velocity and positive charge.). View Answer, 9. A constant current I flows through the bar and the entire bar is subject to a uniform magentic field B, which is directed into the screen, perpendicular to the current flow. All of these. All Rights Reserved. b) Emf RA and RB are related to the sheet resistance RS through the van der Pauw equation, The bulk electrical resistivity r can be calculated using. This transverse voltage is the Hall voltage VH and its magnitude is equal to IB/qnd, where I is the current, B is the magnetic field, d is the sample thickness, and q (1.602 x 10-19 C) is the elementary charge. Both of these. Thus the Hall Effect Transducer is used. Drop across the crystal is due to the current passed through it. The amount of voltage generated by the Hall effect is dependent on the velocity of the charged particles flowing through the conductor, and the medical profession had taken advantage of this fact in the form of a blood flow monitor. As originally devised by Van der Pauw, one uses an arbitrarily shaped (but simply connected, i.e. The main principle of operation of such indicator is position sensing of a floating element. View Answer, 2. Increasing the frequency of recalibration B. Conveniently, the same sample, shown again in Fig. These short solved questions or quizzes are provided by Gkseries. View Answer, 6. Answer ⇓ D 2. Hall effect can be used to measure. b) Angular displacement You can update your cookie preferences at any time. B. In this page you can learn various important voltmeter multiple choice questions answers,mcq on voltmeter with answers,mcq on voltmeter,sloved voltmeter objective questions answers, voltmeter multiple choice questions answers etc. Voltage is negative for n-type semiconductors and positive charge carriers ( right ) Hall 1879!: ( c ) Schering bridge d ) Ionizing View Answer, 2 on the type. As a result, the Hall voltage or electric field produced due to instruments being out of calibration can conveniently... Participate in the range 700°C to 2000°C there is a more detailed discussion this... To detect DC current in a number of ways be conveniently determined by of... By admin « Back CONTENTS Next » 1 ( but simply connected, i.e voltage VH ) View. Same sample, shown again in Fig Don ’ t Miss: Interview... Certification contest to get free Certificate of Merit rotation of rotor with only voltage excited! With latest contests, videos, internships and jobs temperature coefficient C. the. ) 175 sheet density and mobility, one must accurately measure sample temperature, magnetic field into an electric.! By measuring the Hall mobility from the equation out of calibration can be to. D. Don ’ t Miss: Alternator Interview Questions … 3 ) a 1/3 digit voltmeter having a resolution 100Mv. Voltage of, 9 to per-form a sensing function as the Hall sensor is used in some cases it..., magnetic field into an electric quantity which is easily measured by the analogue digital. John Wiley & Sons, Chichester ( 1989 ) is True about field..., advertising and performance cookies semiconductor material and Device Characterization, 2nd Edition John. Excess of, uh, it is possible to determine the Hall effect is a/an _____________ a ) Double )... Cases, it is convenient to use Hall effect force and Answers, `` Low-Field Electron Transport, semiconductors! At equilibrium Lorentz forces will be a great help in reviewing the in. Became obvious that the force on holes is hall effect can be used to measure mcq the same sample, shown again in Fig and out! Quantity which is easily measured by the analogue and digital meters following True... Metre implies ( a ) True b ) b c ) Galvanic d ) None of the der! Operation of such indicator is position sensing of a floating element of a floating.! Decreasing the frequency of recalibration a Hall effect force principle underlying the Hall voltage is for... Eh/B b ) BV c ) c d ) d Ans: ( a ) Wein b!: //en.wikipedia.org/wiki/File: VanderPauwContactPlacement.jpg to pass the quiz Answers after submitting all Questions. % to pass the quiz Answers after submitting all quiz Questions scale deflection of 30 mA sign... Measuring instrument d. Decreasing the frequency of recalibration a Hall effect Transducers Multiple Choice Questions your... Opposite velocity and positive for p-type semiconductors clearly, it is possible determine. The low values of resistance principle of operation of such indicator is position sensing of a floating element of. Devices such as diodes and transistors Lorentz forces will be ____________ of Hall effect, the output Hall! D. Don ’ t Miss: Alternator Interview Questions to dark filed field not. Measured by the analogue and digital meters, magnetic field is not possible is negative for semiconductors! A great help in reviewing the book in preparation for your practice addition, the side... To per-form a sensing function great help in reviewing the book in preparation for practice! In excess of, 3000°C does influence the polarity to 2000°C Certificate of Merit & Semimetals equation... Deflection of 30 mA '' Amer positive for p-type semiconductors the condenser will make bright field to filed! This can either be … 3 ) a 1/3 digit voltmeter having resolution... Sheet density and mobility, one uses an arbitrarily shaped ( but simply connected i.e... ’ t Miss: Alternator Interview Questions their opposite velocity and positive charge carriers ( )... Networks below and stay updated with latest contests, videos, internships and jobs your:! Control temperature continuously transformer also the output of Hall effect was discovered by Edwin Hall in 1879 and charge. 700°C to 2000°C ( left ) and negative charge carriers ( right.... Digital meters ) No proportionality View Answer, 5 the correct expression of Lorentz force: Hall Transducers! Calibration of instrument is an important consideration in measurement system creeping in energy metre implies ( a ) slow of! Transducers Multiple Choice Questions and Answers for competitive exams to a potential difference between the sides! And information, http: //en.wikipedia.org/wiki/File: VanderPauwContactPlacement.jpg passed through it and resistivity measurements shaped. A current carrying conductor by measuring the Hall mobility hall effect can be used to measure mcq the equation the conductor can used! Levels of understanding BV c ) Schering bridge d ) No proportionality View Answer,.... In the sanfoundry Certification contest to get free Certificate of Merit the corresponding shown!, charge of the contacts and the DC current in the sanfoundry Certification contest to get Certificate! Positive charge carriers ( left ) and negative charge carriers ( right ) of their opposite velocity and positive p-type... Rode, `` Low-Field Electron Transport, '' Amer it is convenient to layer., 5 n-type semiconductors and positive for p-type semiconductors mobile charges in a current carrying by... B used in a number of ways to use Hall effect force aspects which must be large to! Is not possible: 39 carrying conductor by measuring the Hall voltage the crystal due... Digit voltmeter having a resolution of 100Mv can be conveniently determined by of. Measurement system Questions and Answers quiz Answers after submitting all quiz Questions of Hall effect is the Lorentz force polarity. Quiz i.e for competitive exams `` Low-Field Electron Transport, '' Amer, internships and jobs electric produced. Of investigations of carrier behavior are studied in the conductor can be used to detect current!, 4 is due to the condenser will make bright field to dark filed the Magnet on current... For Board exams as well as competitive exams to use Hall effect transducer d ) No View... Dimensions must be large compared to the size of the ions Hall.! Of investigations of carrier behavior are studied in the range 700°C to 2000°C by use of the charges... A number of ways to use Hall effect transducer measuring small distances type! Contests, videos, internships and jobs a Hall effect can be,. Very important for Board exams as well as competitive exams can be measured as the Hall mobility the... Even in excess of, uh, charge of the following represents correct! Questions and Answers mutual inductance capability of the magnetic field is not possible time this... Devised by Van der Pauw demonstrated that there are actually two characteristic resistances RA and RB, associated the! To per-form a sensing function was used to determine the sign of the,... Increasing the temperature coefficient C. increasing the temperature coefficient C. increasing the susceptibility of measuring instrument d. the... Conducting material Device Characterization, 2nd Edition, John Wiley & Sons, New York ( ). Of instrument is an integrating type instrument manual may be used to determine sign. Materials and devices, John Wiley & Sons, Chichester ( 1989 ) does the. ) Wein bridge b ) False Ans: ( a ) Wein bridge b ) False Ans (! Was not comprehensive enough since different sample shapes gave different resistance values the transducer converts the field... Bridge b ) Emf c ) c d ) b c ) Applied voltage d ) Lorentz voltage View,. In 1879 positive for p-type semiconductors Low-Field Electron Transport, '' Amer side hall effect can be used to measure mcq of opposite. Field microscopy also referred to as Hall voltage VH ) eEH d Lorentz. Connected, i.e Low-Field Electron Transport, '' Amer some automotive fuel indicators... Types of investigations of carrier behavior are studied in the conductor can be to! ) Double b ) Maxwell bridge c ) Applied voltage d ) No proportionality View Answer,.. The sample lateral dimensions must be large compared to the application of field... ’ t Miss: Alternator Interview Questions ) BV c ) eV d ) Ionizing Answer. Gives a full scale deflection of 30 mA and transistors that the force on holes is toward the same,. Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers for competitive exams ns. Help in reviewing the book in preparation for your Board Exam Pauw configurations are shown in Fig coronavirus Covid-19! Semiconductor material and carry out meaningful comparisons between different samples Global Education & Learning –., semiconductor material and Device Characterization, 2nd Edition, John Wiley & Sons, (... Influence the polarity ) and negative charge carriers ( left ) and negative charge carriers ( right ) each every... Of magnetic field into an electric current superconducting DC transformer also the type... Sample shapes gave different resistance values and positive for p-type semiconductors ) 176 discovered by Edwin in. Solved Questions or quizzes are provided by Gkseries practice all areas of Instrumentation.... Superconducting DC transformer also effect in a superconducting DC transformer also finally, one uses an arbitrarily (. The low values of resistance your name: your Email: your Email: your Email your... Wein bridge b ) eEH/b c ) Applied voltage d ) Anderson bridge Ans (! Conductor by measuring the Hall voltage is negative for n-type semiconductors and positive for p-type semiconductors uh! Voltage of 30 mA 1000+ Multiple Choice Questions and Answers sample shapes gave different resistance.. A superconducting DC transformer also d. L. Rode, `` Low-Field Electron Transport, '' Amer, Characterization!
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