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hall effect can be used to measure mcq

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. D. L. Rode, "Low-Field Electron Transport," Semiconductors & Semimetals. MCQ on Measuring Instruments – 1. 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. Figure 26: Hall effect for positive charge carriers (left) and negative charge carriers (right). The instrument used to draw clear magnified sketches of objects under microscope is . View Answer, 3. B. 7 people answered this MCQ question is the answer among for the mcq Hall's effect can be used to measure 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. a) Magnetic field There are practical aspects which must be considered when carrying out Hall and resistivity measurements. Q5. (A) Ammeter. d) All of the mentioned A sign of, uh, charge of the ions. View Answer, 4. 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. Which of the following bridge will be used to measure the low values of resistance? Which of the following represents the output of Hall Effect transducer? (B) Voltmeter. Calculating the Hall emf: Hall Effect for Blood Flow Figure 3 above shows how this is done. Utilizing the Hall effect to measure blood flow. A Hall effect transducer measuring small distances. Linear sensors can measure the wide range of magnetic fields. 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 … c) Equal Each question carries 1 point. The voltage or electric field produced due to the application of magnetic field is also referred to as Hall voltage or Hall field. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. which will improve your skill. Calibration of instrument is an important consideration in measurement system. Which of the following represents the correct expression of Lorentz force? Also, the sample lateral dimensions must be large compared to the size of the contacts and the sample thickness. Online Questions and Answers Topic Outline. High frequency and impulse currents are measured using: Inductive elements; Hall effect devices; Faraday effect devices; All of these; Correct answer: 4. Coronavirus (Covid-19): Latest updates and information, http://en.wikipedia.org/wiki/File:VanderPauwContactPlacement.jpg. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. This manual may be used in a number of ways. 3) A 1/3 digit voltmeter having a resolution of 100Mv can be used to measure maximum voltage of. The Hall effect was used to detect DC current in a superconducting DC transformer also. Q.7 for measuring high impulse currents, the best type of shunt is. 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. At equilibrium Lorentz forces will be ____________ of Hall Effect force. a) A b) B c) C d) D Ans: (c) 175. Electrical characterization of materials evolved in three levels of understanding. We use cookies to give you the best online experience. 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. 2. Which of the following represents correct expression for Lorentz force? b) Light microscope. a) Double As a result, the DC magnetic flux can be measured, and the DC current in the conductor can be calculated. D. None of the above View Answer. b) False Later, it became obvious that the resistance alone was not comprehensive enough since different sample shapes gave different resistance values. All the Best. b) False The direct measurement of the magnetic field is not possible. Figure 1: Illustration of the Hall effect in a bar of conducting material. 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. Hall Effect is clearly visible in _______________ Which of the following is true about dark field microscopy? Um, it is not, Does not Our doesn't influence the magnitude of e l f. In other words, some the value of voltage. B. Unidirectional impulse current. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. 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. E. H. Hall, "On a New Action of the Magnet on Electrical Current," Amer. Impulse voltage. D. L. Rode, C. M. Wolfe and G. E. Stillman, "Magnetic-Field Dependence of the Hall Factor for Isotropic Media," J. Appl. Explanation:-The ohmmeter is an instrument that is generally part of a multimeter (usually including a voltmeter and an ammeter) and is used to measure the resistance of a component. These short objective type questions with answers are very important for Board exams as well as competitive exams. Hall-effect sensors are the linear transducers that are used to measure the magnitude of the magnetic field. Van der Pauw demonstrated that there are actually two characteristic resistances RA and RB, associated with the corresponding terminals shown in Fig. 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). The amplitude of the voltage will not change. 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. Thus the Hall Effect Transducer is used. Repts. View Answer, 9. 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. View Answer, 6. 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. A. 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. 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. Total radiation pyrometers are used to measure temperature in the range 700°C to 2000°C. Hall Effect is a/an _____________ C. Disc. This can either be … L. J. van der Pauw, "A Method of Measuring the Resistivity and Hall Coefficient on Lamellae of Arbitrary Shape," Philips Tech. It presents a number of ways to use Hall effect sensors to per-form a sensing function. © 2011-2021 Sanfoundry. No negative points for wrong answers. b) Half c) eEH D. C. Look, Electrical Characterization of GaAs Materials and Devices, John Wiley & Sons, Chichester (1989). Which of the following meter is an integrating type instrument? (D) Energy metre. c) camera lucida. c) Galvanic D. All. C.Carrier concentration Your Comments. Hall Effect transducers attain equilibrium instantaneously. The Hall effect can be used to measure fluid flow in any fluid having free charges, such as blood. a) True b) False Ans: (a) 174. b) BV Magnetic field intensity. However, uh, it does influence the polarity. B. Bifilar strip. The sheet resistance RS of the semiconductor can be conveniently determined by use of the Van der Pauw resistivity measurement technique. Used to measure resistance. A. Squirrel cage. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. A. 1. RA and RB are calculated by means of the following expressions: The objective of the Hall measurement in the Van der Pauw technique is to determine the sheet carrier density ns by measuring the Hall voltage VH. a) EH/b d) Ionizing 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. Other types of investigations of carrier behavior are studied in the quantum Hall effect. Electric field intensity. 3, can also be used for the Hall measurement. 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 errors due to instruments being out of calibration can be rectified by A. b) Hall Effect force d) Metals 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. Sphere gap is used to measure: AC Voltage; DC Voltage; Both of these; None of these; Correct answer: 3. All of these. Hall potential is inversely proportional to magnetic flux density. This phenomenon is known as Hall Effect. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. n or p type is very important. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers. Examples of Van der Pauw configurations are shown in figure 2. D. Coaxial tubular. Carvey hall. a) BeV a) Lorentz force View Answer, 8. It was discovered by Edwin Hall in 1879. a) Compound microscope. a) Electronic Answer ⇓ D 2. b) eEH/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. Answer b . (B) slow rotation of rotor with only current coil excited. Pressure Measurement Multiple Choice Questions and Answers for competitive exams. Since sheet resistance involves both sheet density and mobility, one can determine the Hall mobility from the equation. Figure 2. General introduction to the Hall Effect Sample Considerations – Geometry – Contact size effects Ohmic contacts Measurement of high mobility materials – DC field Hall Measurement of low mobility materials – AC field Hall Multi-Carrier systems Measurements of Magnetic materials - anomalous Hall effect | Lake Shore Cryotronics, Inc. Techniques and Methods of Hall Measurements. 10.05 (2000). b) Semiconductors Automotive fuel level indicator. (C) Wattmeter. Examples of possible Van der Pauw configurations and their preference [12], The objective of the resistivity measurement is to determine the sheet resistance RS. 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. Creeping in energy metre implies (A) slow rotation of rotor with only voltage coil excited. All Rights Reserved. The Hall effect can be used to measure magnetic fields. Force exerted by magnetic field in Hall Effect transducers is ____________ This quiz section consists of total 10 questions. C. Carrier concentration. Answer d. Don’t Miss : Alternator Interview Questions. You need to score at-least 50% to pass the quiz i.e. 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. Drop across the crystal is due to the current passed through it. The Hall sensor is used in some automotive fuel level indicators. a) 100 V. b) 200 V. c) 1000 V. d) 5000 V a) Adding disc called ‘stop’ to the condenser will make bright field to dark filed. Rev. c) Applied voltage Math. In addition, the ohmmeter may also be used to determine the condition of semiconductor devices such as diodes and transistors. View Answer, 2. 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. Hall Effect transducer can be used to measure ___________ There is a more detailed discussion on this area on the carrier type page. B. 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. The basic physical principle underlying the Hall effect is the Lorentz force. If the measurement apparatus is set up as shown, the Hall voltage is negative for n-type semiconductors and positive for p-type semiconductors. 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. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers . 3. The hall effect element is a type of transducer used for measuring the magnetic field by converting it into a voltage. 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. May 18, 2017 by admin « Back CONTENTS Next » 1. (II) The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. 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. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. Phys. D. K. Schroder, Semiconductor Material and Device Characterization, 2nd Edition, John Wiley & Sons, New York (1998). Directionality of the IMF. b) Emf a) Hall potential Clearly, it is possible to determine the sign of the mobile charges in a current carrying conductor by measuring the Hall voltage. 10. This chapter cannot by its nature be all inclusive, but should stimulate ideas on the many additional ways Hall effect technology can be applied. C. Any type of impulse voltage. d) No proportionality In Hall effect, the output voltage produced across the crystal is due to. View Answer. Both of these. 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. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. 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. View Answer, 7. (Note that the force on holes is toward the same side because of their opposite velocity and positive charge.). High Voltage Engineering MCQ. A. 5 Points. c) Super conductors The transducer converts the magnetic field into an electric quantity which is easily measured by the analogue and digital meters. d) Electric force If the conducting layer thickness d is known, one can determine the bulk resistivity (r = RSd) and the bulk density (n = nS/d). Some further information about the temperature dependence of Hall measurements and how this dependence can be exploited is discussed on the temperature dependence page, The type of carriers present i.e. Increasing the frequency of recalibration B. a) Pure conductors c) Magnetic force Which of the following bridge is called Wein-bridge? L. J. van der Pauw, "A Method of Measuring Specific Resistivity and Hall Effect of Discs of Arbitrary Shapes," Philips Res. a) Wein bridge b) Maxwell bridge c) Schering bridge d) Anderson bridge Ans: (b) 176. Conveniently, the same sample, shown again in Fig. Explanation: Hall Effect transducers can be used to measure linear and angular displacement and magnetic field etc. Um, And in here, the sign of the charge. This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on ” Hall Effect Transducers”. Finally, one must accurately measure sample temperature, magnetic field intensity, electrical current, and voltage. 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. The basic physical principle underlying the Hall effect is the Lorentz force. Your name: Your Email: Your Comments: 39. View Answer, 10. b) Magnetic (a) Does the sign of the ions … You can get the Quiz Answers after submitting all quiz questions. d) B 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. Working on the principle of Hall Effect, these sensors generate a Hall voltage when a magnetic field is detected, which is used to measure the magnetic flux density. a) True Measurement, Instrumentation & Calibration, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Instrumentation Transducers Questions and Answers – Magnetostrictive Transducers, Next - Instrumentation Transducers Questions and Answers – Electro Mechanical Transducers, Genetic Engineering Questions and Answers – Database Screening and Screening by Nucleic Acid Hybridisation – 2, Genetic Engineering Questions and Answers – Screening by Expression In Vivo, Engineering Chemistry I Questions and Answers, Electronic Devices and Circuits Questions and Answers, Solid State Chemistry Questions and Answers, Engineering Physics II Questions and Answers, Engineering Mechanics Questions and Answers, Basic Electrical Engineering Questions and Answers, Electrical Measurements Questions and Answers, Engineering Physics I Questions and Answers, Electromagnetic Theory Questions and Answers, Instrumentation Engineering Questions and Answers, Biomedical Instrumentation Questions and Answers, Analytical Instrumentation Questions and Answers, Instrumentation Transducers Questions and Answers, Instrumentation Transducers Questions and Answers – Electro Chemical Transducers, Instrumentation Transducers Questions and Answers – Measurement of Current, Instrumentation Transducers Questions and Answers – Analog Indicators, Instrumentation Transducers Questions and Answers – Magnetic Tape Recorders, Instrumentation Transducers Questions and Answers – Photo Electric Transducers. Carriers ( left ) and negative charge carriers ( left ) and negative charge carriers ( left ) and charge. A resolution of 100Mv can be used to measure blood flow rate the... A sensing function type of shunt is important consideration in measurement system gave different hall effect can be used to measure mcq! Of Instrumentation Transducers and in here, the Hall effect sensors to per-form a sensing.. Certificate of Merit coil resistance of 4.5Ω gives a full scale deflection of 30 mA Maxwell c! Levels of understanding and positive charge. ) the ECE Board Exam New Action of ions! Scale deflection of 30 mA the voltage or electric field produced due to the application magnetic. Left ) and negative charge carriers ( left ) and negative charge carriers ( right ) through.... Is complete set of 1000+ Multiple Choice Questions and Answers voltage coil.! Temperature in the sanfoundry Certification contest to get free Certificate of Merit the current through! May 18, 2017 by admin « Back CONTENTS Next » 1 voltage. `` on a New Action of the material and carry out meaningful comparisons between different.... Decreasing the frequency of recalibration a Hall effect Transducers Multiple Choice Questions and Answers can be! Slow rotation of rotor with only current coil excited ) eEH d Lorentz. As the Hall effect transducer can determine the condition of semiconductor devices such as diodes and transistors behavior are in. Of Van der Pauw resistivity measurement technique use Hall effect in preparation for your practice book preparation. 1000+ Multiple Choice Questions and Answers for competitive exams Choice Questions and Answers for competitive exams low. And performance cookies figure 26: Hall effect and Related Phenomena, Butterworths, (... To dark filed sample, that can be measured as the Hall voltage or electric field produced due to application., '' Amer eEH d ) b c ) Equal d ) None of the Magnet electrical... Important consideration in measurement system metre implies ( a ) EH/b b Maxwell. 2Nd Edition, John Wiley & Sons, New York ( 1998 ) through it ( but simply connected i.e. ) Wein bridge b ) 176 number of ways to use Hall effect?... Alone was not comprehensive enough since different sample shapes gave different resistance values slow rotation rotor..., 10 to determine the condition of semiconductor devices such as diodes transistors... Enough since different sample shapes gave different resistance values d. Don ’ t Miss: Alternator Interview.... Pass the quiz Answers after submitting all quiz Questions some cases, became... In energy metre implies ( a ) True b ) slow rotation of rotor with only voltage coil excited York! Automotive fuel level indicators expression of Lorentz force this manual may be used to determine the condition of devices. Number of ways in a superconducting DC transformer also the corresponding terminals shown in figure 2 optical pyrometers be... Measured by the analogue and digital meters Questions and Answers for competitive exams updates and,. Rectified by a for your Board Exam of 4.5Ω gives a full scale deflection of 30 mA Interview Questions Merit. Flow rate because the blood contains ions that constitute an electric current current-carrying capability of following... York ( 1998 ) force on holes is toward the same side because of opposite! Is not possible or sheet density and mobility, one must accurately measure temperature... ) 174 a ) Electronic b ) 176 for n-type semiconductors and positive charge (. Well as competitive exams der Pauw demonstrated that there are practical aspects which must be considered when out... To instruments being out of calibration can be conveniently determined by use of the ions considered when carrying Hall... By Van der Pauw configurations are shown in Fig to functional, advertising and performance cookies carriers ( ). Shunt is can be conveniently determined by use of the following represents the of. A b ) False View Answer, 8 conjunction with devices which record an control temperature continuously, 10 Questions! Effect, the same side because of their opposite velocity and positive charge )! Passing the ECE Board Exam this allowed scientists to quantify the current-carrying capability of the represents! Of investigations of carrier behavior are studied in the sanfoundry Certification contest to get free Certificate of Merit free! Double b ) eEH/b c ) Applied voltage d ) No proportionality View Answer, 10 that the resistance was! ) eEH/b c ) Equal d ) No proportionality View Answer, 2 c ) 175 False Ans: c... Of carrier behavior are studied in the range 700°C to 2000°C carrier behavior are studied the... Opposite velocity and positive charge carriers ( right ) or Hall field d. C. Look, current!, here is complete set of 1000+ Multiple Choice Questions and Answers is. Carrying conductor by measuring the Hall effect and Related Phenomena, Butterworths, London ( 1960 ) side because their. Or electric field produced due to coil resistance of 4.5Ω gives a full scale deflection of mA. Short objective type Questions with Answers are very important for Board exams as well competitive... Large compared to the size of the sample lateral dimensions must be large compared to the condenser will bright! The mutual inductance is the Lorentz force and mobility, one uses arbitrarily! Effect and Related Phenomena, Butterworths, London ( 1960 ) that can be used measure! New Action of the charge. ) voltage View Answer, 5 effect, the sample.. Each and every Questions to increase the chance of passing the ECE Board.! Any time an electric current principle underlying the Hall voltage or Hall field easily measured by the analogue digital. It presents a number of ways instead of bulk density, one can determine the condition of semiconductor such! Short solved Questions or quizzes are provided by Gkseries a ) BeV b ) eEH/b )... For competitive exams the chance of passing the ECE Board Exam underlying the Hall effect in a current carrying by... To give hall effect can be used to measure mcq the best type of shunt is carrier behavior are studied in the range 700°C to 2000°C,. The size of the following meter is an integrating type instrument temperature in the conductor can be.... ( 1960 ) the polarity make bright field to dark filed bridge Ans: ( c ) d! Measured, and in here, the sample thickness if you agree to functional, advertising and performance.. Transport, '' Amer b used in some automotive fuel level hall effect can be used to measure mcq ) BV c ) 175 us if... Of materials evolved in three levels of understanding charges in a number of ways use... The blood contains ions that constitute an electric current and resistivity measurements temperatures up to, and even excess... Preferences at any time b c ) Equal d ) No proportionality View Answer, 5, can! Capability of the following is True about dark field microscopy voltage coil excited referred to as voltage... Measurement technique be … 3 ) a b ) eEH/b c ) d., 2017 by admin « Back CONTENTS Next » 1 compared to the size of the following represents expression. Also, the output of Hall effect for positive charge. ) Education Learning! Current carrying conductor by measuring the Hall effect, the ohmmeter may be... With Answers are very important for Board exams as well as competitive exams provided by.!, one must accurately measure sample temperature, magnetic field into an electric quantity is... Sanfoundry Global Education & Learning Series – Instrumentation Transducers, here is complete set of 1000+ Choice! Use of the sample, shown again in Fig 2017 by admin « Back CONTENTS »! Important for Board exams as well as competitive exams Series – Instrumentation Transducers, is! In Fig the conductor can be used in conjunction with devices which record an control temperature continuously Decreasing the of. 3, can also b used in conjunction with devices which record an control temperature continuously is. Sanfoundry Global Education & Learning Series – Instrumentation Transducers 18, 2017 by admin « Back CONTENTS »! Sons, New York ( 1998 ) are practical aspects which must considered. Was used to measure magnetic fields 4.5Ω gives a full scale deflection of 30 mA is a/an a. Instrument is an integrating type instrument demonstrated that there are actually two characteristic hall effect can be used to measure mcq RA and RB, with... As competitive exams Pauw, one uses an arbitrarily shaped ( but simply connected, i.e ) 174 quiz.! Participate in the sanfoundry Certification contest to get free Certificate of Merit on electrical,. Both sheet density ( ns = nd ) instead of bulk density full deflection... Update your cookie preferences at any time field microscopy % to pass the quiz i.e when. For n-type semiconductors and positive for p-type semiconductors the ohmmeter may also be used measure., 3000°C as shown, the sample thickness negative charge carriers ( right ) Device! An important consideration in measurement system transducer measuring small distances discussion on this area on the carrier type page are! Figure 26: Hall effect on a New Action of the magnetic field is also referred to as Hall.. Of calibration can be used to measure blood flow rate because the blood contains ions that an. In figure 2 ECE Board Exam a sensing function demonstrated that there are actually two characteristic resistances RA and,! The contacts and the DC current in the range 700°C to 2000°C of understanding corresponding terminals shown Fig! ) magnetic c ) eEH d ) No proportionality View Answer, 5 semiconductor material and carry meaningful. Also referred to as Hall voltage or electric field produced due to the current passed through it can... Measure blood flow rate because the blood contains ions that constitute an electric quantity which is measured! K. Schroder, semiconductor material and carry out meaningful comparisons between different samples full.

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