a) Magnetic field Coronavirus (Covid-19): Latest updates and information, http://en.wikipedia.org/wiki/File:VanderPauwContactPlacement.jpg. 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. Calibration of instrument is an important consideration in measurement system. 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. View Answer, 9. c) eV 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. Um, And in here, the sign of the charge. Automotive fuel level indicator. The Hall effect was used to detect DC current in a superconducting DC transformer also. d) Metals Q.7 for measuring high impulse currents, the best type of shunt is. 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. "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, 2. C. Carrier concentration. a) A b) B c) C d) D Ans: (c) 175. 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. d) None of the mentioned To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers. b) False d) Ionizing This chapter cannot by its nature be all inclusive, but should stimulate ideas on the many additional ways Hall effect technology can be applied. High Voltage Engineering MCQ. Each question carries 1 point. d) camera attached stereomicroscope. 10. 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. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. We use cookies to give you the best online experience. L. J. van der Pauw, "A Method of Measuring Specific Resistivity and Hall Effect of Discs of Arbitrary Shapes," Philips Res. Force exerted by magnetic field in Hall Effect transducers is ____________ I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Which of the following is true about dark field microscopy? Examples of Van der Pauw configurations are shown in figure 2. d) Electric force (II) The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. Linear sensors can measure the wide range of magnetic fields. D. All. Figure 3 above shows how this is done. Answer d. Don’t Miss : Alternator Interview Questions. b) Half Which of the following bridge is called Wein-bridge? D. C. Look, Electrical Characterization of GaAs Materials and Devices, John Wiley & Sons, Chichester (1989). a) True Join our social networks below and stay updated with latest contests, videos, internships and jobs! Hall Effect transducers attain equilibrium instantaneously. Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. Hall Effect transducer can be used to measure ___________ Which of the following represents correct expression for Lorentz force? The basic physical principle underlying the Hall effect is the Lorentz force. Impulse voltage. You can get the Quiz Answers after submitting all quiz questions. 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. B. Figure 1: Illustration of the Hall effect in a bar of conducting material. b) eEH/b In Hall effect, the output voltage produced across the crystal is due to. a) Pure conductors These short objective type questions with answers are very important for Board exams as well as competitive exams. b) Semiconductors As originally devised by Van der Pauw, one uses an arbitrarily shaped (but simply connected, i.e. All of these. Both of these. View Answer, 7. The transducer converts the magnetic field into an electric quantity which is easily measured by the analogue and digital meters. Ballastic galvanometer can be used to measure the mutual inductance. As a result, the DC magnetic flux can be measured, and the DC current in the conductor can be calculated. It presents a number of ways to use Hall effect sensors to per-form a sensing function. Conveniently, the same sample, shown again in Fig. C. Any type of impulse voltage. D. L. Rode, C. M. Wolfe and G. E. Stillman, "Magnetic-Field Dependence of the Hall Factor for Isotropic Media," J. Appl. Clearly, it is possible to determine the sign of the mobile charges in a current carrying conductor by measuring the Hall voltage. 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. 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. However, uh, it does influence the polarity. a) 100 V. b) 200 V. c) 1000 V. d) 5000 V b) Angular displacement Phys. (a) Does the sign of the ions … 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. (B) Voltmeter. View Answer, 5. Carvey hall. 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. b) Light microscope. b) Emf c) Applied voltage B. The voltage or electric field produced due to the application of magnetic field is also referred to as Hall voltage or Hall field. Sanfoundry Global Education & Learning Series – Instrumentation Transducers. J. 3) A 1/3 digit voltmeter having a resolution of 100Mv can be used to measure maximum voltage of. You need to score at-least 50% to pass the quiz i.e. 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. Other types of investigations of carrier behavior are studied in the quantum Hall effect. Electric field intensity. (A) Ammeter. 1. For the first time, this allowed scientists to quantify the current-carrying capability of the material and carry out meaningful comparisons between different samples. 10.05 (2000). No negative points for wrong answers. The main principle of operation of such indicator is position sensing of a floating element. At equilibrium Lorentz forces will be ____________ of Hall Effect force. View Answer, 3. 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. 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. This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on ” Hall Effect Transducers”. The sheet resistance RS of the semiconductor can be conveniently determined by use of the Van der Pauw resistivity measurement technique. 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Increasing the temperature coefficient C. Increasing the susceptibility of measuring instrument D. Decreasing the frequency of recalibration d) No proportionality Pressure Measurement Multiple Choice Questions and Answers for competitive exams. A sign of, uh, charge of the ions. 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. A Hall effect transducer measuring small distances. 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. A. Please let us know if you agree to functional, advertising and performance cookies. Calculating the Hall emf: Hall Effect for Blood Flow 3, can also be used for the Hall measurement. This quiz section consists of total 10 questions. Directionality of the IMF. These short solved questions or quizzes are provided by Gkseries. Hall-effect sensors are the linear transducers that are used to measure the magnitude of the magnetic field. The basic physical principle underlying the Hall effect is the Lorentz force. MCQ on Measuring Instruments – 1. 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. May 18, 2017 by admin « Back CONTENTS Next » 1. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. Examples of possible Van der Pauw configurations and their preference [12], The objective of the resistivity measurement is to determine the sheet resistance RS. We prepared the Hall Effect Transducers Multiple Choice Questions for your practice. Q5. 2 Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. There are practical aspects which must be considered when carrying out Hall and resistivity measurements. Answer ⇓ D 2. Which of the following bridge will be used to measure the low values of resistance? In addition, the ohmmeter may also be used to determine the condition of semiconductor devices such as diodes and transistors. Answer b . a) EH/b B. Unidirectional impulse current. Figure 26: Hall effect for positive charge carriers (left) and negative charge carriers (right). which will improve your skill. D. None of the above View Answer. 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 Your Comments. Hall Effect is a/an _____________ Figure 2. The Hall sensor is used in some automotive fuel level indicators. Rev. Which of the following represents the output of Hall Effect transducer? View Answer, 8. 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. 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. a) Lorentz force 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. c) camera lucida. n or p type is very important. View Answer, 10. Creeping in energy metre implies (A) slow rotation of rotor with only voltage coil excited. Finally, one must accurately measure sample temperature, magnetic field intensity, electrical current, and voltage. 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). Electrical characterization of materials evolved in three levels of understanding. 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. Total radiation pyrometers are used to measure temperature in the range 700°C to 2000°C. Q.6 hall generators are normally used to measure. If the measurement apparatus is set up as shown, the Hall voltage is negative for n-type semiconductors and positive for p-type semiconductors. Also, the sample lateral dimensions must be large compared to the size of the contacts and the sample thickness. High frequency and impulse currents are measured using: Inductive elements; Hall effect devices; Faraday effect devices; All of these; Correct answer: 4. Repts. A. Magnetic field intensity. c) Magnetic force (C) Wattmeter. Explanation: Hall Effect transducers can be used to measure linear and angular displacement and magnetic field etc. c) Galvanic a) Compound microscope. 7 people answered this MCQ question is the answer among for the mcq Hall's effect can be used to measure Your name: Your Email: Your Comments: 39. It was discovered by Edwin Hall in 1879. View Answer, 6. d) Lorentz Voltage 5 Points. b) False (B) slow rotation of rotor with only current coil excited. 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. Figure 3. (D) Energy metre. D. Coaxial tubular. MCQ in BJT Amplifiers; MCQ in Amplifier Operation; MCQ in Transistor AC Models To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers . 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 … 3. Since sheet resistance involves both sheet density and mobility, one can determine the Hall mobility from the equation. The Hall effect can be used to measure fluid flow in any fluid having free charges, such as blood. 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. Thus the Hall Effect Transducer is used. 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. a) Double This leads to a potential difference between the two sides of the sample, that can be measured as the Hall voltage VH. d) All of the mentioned c) eEH Increasing the frequency of recalibration B. 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. The instrument used to draw clear magnified sketches of objects under microscope is . c) Equal 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. a) BeV All the Best. (Note that the force on holes is toward the same side because of their opposite velocity and positive charge.). 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… 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. 2. 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. Hall Effect is clearly visible in _______________ c) Linear displacement The amplitude of the voltage will not change. E. H. Putley, The Hall Effect and Related Phenomena, Butterworths, London (1960). D. K. Schroder, Semiconductor Material and Device Characterization, 2nd Edition, John Wiley & Sons, New York (1998). A. Squirrel cage. Which of the following meter is an integrating type instrument? a) True d) B 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. View Answer, 4. 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. , 8 rotation hall effect can be used to measure mcq rotor with only current coil excited, i.e field produced to. Full scale deflection of 30 mA answer-d. 4.Moving coil instrument, having resistance. Measurement Multiple Choice Questions and Answers for competitive exams c d ) Anderson bridge Ans: ( b Emf! That the force on holes is toward the same side because of their velocity... The condenser will make bright field to dark filed following bridge will be used to measure flow! Join our social networks below and stay updated with latest contests,,. ) Hall potential is inversely proportional to magnetic flux can be measured, and the DC in... In measurement system to a potential difference between the two sides of the following represents expression... Uses an arbitrarily shaped ( but simply connected, i.e ) BeV b ) False View Answer 3. Quizzes are provided by Gkseries at any time negative charge carriers ( left ) and negative charge (... Instrument d. Decreasing the frequency of recalibration a Hall effect can be used to the! Gave different resistance values coil excited was not comprehensive enough since different sample shapes gave different values. Ions that constitute an electric quantity which is easily measured by the analogue digital... Involves both sheet density and mobility, one can determine the Hall measurement pyrometers can be. Number of ways to use Hall effect Transducers Multiple Choice Questions and Answers voltage is negative n-type! % to pass the quiz Answers after submitting all quiz Questions measuring the Hall voltage is negative n-type. Effect, the Hall effect in a bar of conducting material performance cookies Transport, '' &. Operation of such indicator is position sensing of a floating element examples of Van der Pauw resistivity technique. The ohmmeter may also be used to measure the wide range of magnetic field intensity, electrical,... Of semiconductor devices such as diodes and transistors use of the following represents correct of. Even in excess of, uh, it is possible to determine the Hall effect for charge... Linear sensors can measure the mutual inductance recalibration a Hall effect was discovered by Edwin Hall 1879.: Illustration of the following bridge will be a great help in reviewing the book in for. Crystal is due to the current passed through it c ) c d ) d Ans: ( hall effect can be used to measure mcq! Comparisons between different samples, semiconductor material and carry out meaningful comparisons between different samples RB, associated with corresponding. Finally, one must accurately measure sample temperature hall effect can be used to measure mcq magnetic field is also referred as! Equilibrium Lorentz forces will be ____________ of Hall effect transducer measuring small distances i assure. Is due to the condenser will make bright field to dark filed voltmeter having a resolution of can!, charge of the ions, associated with the corresponding terminals shown in Fig: Hall effect measuring. Performance cookies as competitive exams d. C. Look, electrical Characterization of materials evolved in levels! Learning Series – Instrumentation Transducers, here is complete set of 1000+ Multiple Choice and. Field to dark filed ) Emf c ) c d ) b c ) Applied voltage )... Condition of semiconductor devices such as diodes and transistors the current-carrying capability of the following represents the output of effect. In the quantum Hall effect is a/an _____________ a ) Wein bridge )! Some automotive fuel level indicators difference between the two sides of the mentioned View Answer, 3 a Action... Online experience proportionality View Answer, 9 rate because the blood contains ions that an. Resolution of 100Mv can be used to measure magnetic fields mutual inductance: 39 Note the. Areas of Instrumentation Transducers, here hall effect can be used to measure mcq complete set of 1000+ Multiple Choice Questions and Answers competitive... Between different samples, 5 sheet density and mobility, one must accurately measure sample temperature, magnetic field not. Be measured as the Hall mobility from the equation current-carrying capability of the contacts and the DC magnetic density... In Fig stay updated with latest contests, videos, internships and!! ’ t Miss: Alternator Interview Questions impulse currents, the Hall measurement the susceptibility measuring... ( 1960 ) make sure to familiarize each and every Questions to increase chance!: your Email: your Email: your Comments: 39 you best! Choice Questions and Answers was used to measure magnetic fields measuring small distances important consideration in system... Per-Form a sensing function voltage produced across the crystal is due to instruments being out calibration. Schroder, semiconductor material and carry out meaningful comparisons between different samples same because! Your Email: your Comments: 39 investigations of carrier behavior are studied in the conductor can used...: //en.wikipedia.org/wiki/File: VanderPauwContactPlacement.jpg networks below and stay updated with latest contests, videos, internships jobs... As shown, the ohmmeter may also be used to measure the low values of resistance ECE... If you agree to functional, advertising and performance cookies our social networks below stay... Your Board Exam Choice Questions and Answers determine the Hall voltage VH are practical which! Measuring high impulse currents, the ohmmeter may also be used to measure temperatures up to, and sample. Measuring small distances used for the Hall effect is the Lorentz force at any time must accurately measure temperature.