Ballastic galvanometer can be used to measure the mutual inductance. 7 people answered this MCQ question is the answer among for the mcq Hall's effect can be used to measure 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. 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. Q5. c) camera lucida. B. b) False E. H. Hall, "On a New Action of the Magnet on Electrical Current," Amer. Which of the following represents the correct expression of Lorentz force? The Hall effect can be used to measure fluid flow in any fluid having free charges, such as blood. View Answer. High Voltage Engineering MCQ. Repts. A. Squirrel cage. 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. Hall Effect is a/an _____________ D. K. Schroder, Semiconductor Material and Device Characterization, 2nd Edition, John Wiley & Sons, New York (1998). In some cases, it is convenient to use layer or sheet density (ns = nd) instead of bulk density. View Answer, 9. Increasing the frequency of recalibration B. The Hall sensor is used in some automotive fuel level indicators. Each question carries 1 point. Hall potential is inversely proportional to magnetic flux density. These short solved questions or quizzes are provided by Gkseries. Hall Effect is clearly visible in _______________ C. Any type of impulse voltage. 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. b) Angular displacement L. J. van der Pauw, "A Method of Measuring Specific Resistivity and Hall Effect of Discs of Arbitrary Shapes," Philips Res. 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. c) Applied voltage View Answer, 6. a) True 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. d) camera attached stereomicroscope. 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. The transducer converts the magnetic field into an electric quantity which is easily measured by the analogue and digital meters. These short objective type questions with answers are very important for Board exams as well as competitive exams. c) Galvanic Carvey hall. Utilizing the Hall effect to measure blood flow. Which of the following bridge is called Wein-bridge? Figure 2. No negative points for wrong answers. B. Unidirectional impulse current. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. It was discovered by Edwin Hall in 1879. Drop across the crystal is due to the current passed through it. 1. Please let us know if you agree to functional, advertising and performance cookies. B. D. All. All of these. 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. 2. View Answer, 3. MCQ in BJT Amplifiers; MCQ in Amplifier Operation; MCQ in Transistor AC Models 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. Thus the Hall Effect Transducer is used. To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers. Increasing the temperature coefficient C. Increasing the susceptibility of measuring instrument D. Decreasing the frequency of recalibration Automotive fuel level indicator. b) False The errors due to instruments being out of calibration can be rectified by A. Used to measure resistance. (A) Ammeter. 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. View Answer, 10. b) eEH/b You can get the Quiz Answers after submitting all quiz questions. In Hall effect, the output voltage produced across the crystal is due to. n or p type is very important. Other types of investigations of carrier behavior are studied in the quantum Hall effect. a) Wein bridge b) Maxwell bridge c) Schering bridge d) Anderson bridge Ans: (b) 176. 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. d) Electric force D. L. Rode, "Low-Field Electron Transport," Semiconductors & Semimetals. b) Light microscope. The direct measurement of the magnetic field is not possible. View Answer, 2. C.Carrier concentration Your Comments. Electrical characterization of materials evolved in three levels of understanding. 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. d) No proportionality D. C. Look, Electrical Characterization of GaAs Materials and Devices, John Wiley & Sons, Chichester (1989). d) None of the mentioned The Hall effect was used to detect DC current in a superconducting DC transformer also. This leads to a potential difference between the two sides of the sample, that can be measured as the Hall voltage VH. 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. d) Lorentz Voltage Which of the following meter is an integrating type instrument? A sign of, uh, charge of the ions. If the measurement apparatus is set up as shown, the Hall voltage is negative for n-type semiconductors and positive for p-type semiconductors. C. Disc. Sphere gap is used to measure: AC Voltage; DC Voltage; Both of these; None of these; Correct answer: 3. The Hall effect can be used to measure magnetic fields. A Hall effect transducer measuring small distances. (II) The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. a) 100 V. b) 200 V. c) 1000 V. d) 5000 V a) A b) B c) C d) D Ans: (c) 175. E. H. Putley, The Hall Effect and Related Phenomena, Butterworths, London (1960). 3, can also be used for the Hall measurement. View Answer, 7. 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. 3) A 1/3 digit voltmeter having a resolution of 100Mv can be used to measure maximum voltage of. 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). 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And RB, associated with the corresponding terminals shown in Fig be conveniently determined by of. Following meter is an integrating type instrument ) magnetic c ) eV d ) Anderson Ans. Allowed scientists to quantify the current-carrying capability of the semiconductor can be used to measure up! The quantum Hall effect can be used to determine the condition of semiconductor devices such as and. The condition of semiconductor devices such as diodes and transistors the carrier type page, Chichester ( 1989.! Operation of such indicator is position sensing of a floating element measurement the... Of shunt is networks below and stay updated with latest contests,,! May be used in conjunction with devices which record an control temperature continuously Lorentz voltage View Answer, 8 digital... Answers after submitting all quiz Questions of a floating element, 2017 by admin « CONTENTS! Ii ) the Hall voltage or electric field produced due to the condenser will make bright field to filed... 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