# resistance temperature detector is mcq

3. This test is Rated positive by 94% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by Electrical Engineering (EE) teachers. Q1. 50+ MCQ with answer and reasoning Ans: a. b) a mechanical transducer When an unknown emf was connected, the balance was obtained at 82 cm. Mica is placed in between the steel sheath and resistance wire for better electrical insulation. S Bharadwaj Reddy September 23, 2019 April 27, 2020. However, copper oxidizes at higher temperatures. (254) (1) Find the resistance at 35°C. Q.131.As temperature increases, if resistance increases then device is having (a) NTC (b) PTC (c) STC (d) ETC. © 2011-2020 Sanfoundry. How to Install Thermowell on an Elbow? It is also known as a resistance thermometer. This wire is referred to as a temperature sensor. d) infinite change in resistance The element is constructed from pure materials such as nickel, platinum or copper. But the extension wire resistances are very important to be considered, because the impedance of the extension wires may affect the temperature reading. d) by painting the elements If we want to measure temperature with high accuracy, an RTD is the ideal solution, as it has good linear characteristics over a wide range of temperatures. If it will not pure, it will deviate from the conventional resistance-temperature graph. MCQ Topic Outline included in ECE Board Exam Syllabi . a. Q1. As the temperature of a metal increases, the metal’s resistance to the flow of electricity increases. Installed in this pipe is a 2-wire 100 Ω RTD inside a thermowell, not connected to a transmitter or any other circuit. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. Q2. The RTD wire is a pure material, typically platinum, nickel, or copper. This test is Rated positive by 90% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by … A resistance temperature detector (RTD) can be connected with 2, 3 or 4 wires. Sensing element in the thermometer must provide ________ In the case of platinum, the resistance change is 0.4% per °C. Thermistor:- fused metal oxide mixture increasing temp. Important to minimize self-heating errors. We can get this RTD in market. Part 2: List for questions and answers of Manufacturing Process-I. RTDs work on a basic correlation between metals and temperature. Calculate Temperature from the RTD Question : Suppose you need to determine the temperature of a fluid inside a pipe. d) a physical transducer The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. Recorder­:-They are used to record the IR spectrum, white paper or transparent sheet. Part 2: List for questions and answers of Manufacturing Process-I. Resistivity of metals is a function of temperature. 50+ MCQ with answer and reasoning Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. This is called as self-heating in RTD. B. In RTD devices; Copper, Nickel and Platinum are widely used metals. The kinetic energy of a bounded electron is (a) less than that of unbounded electron (b) greater than that of unbounded electron (c) equal to that of unbounded electron (d) infinite (e) none of the above . Resistance thermometer provides the change in electrical resistance. The figure-1 shows the resistance-temperature characteristics curve of the three different metals. Resistance Temperature Detector (RTD) is a temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. a) M U /M A Converter b) A/M A Converter c) R/M A Converter d) None of the above Ans: (c) 125. If at one end, the two wires made of different metals are joined together then a voltage will get produced between the two wires due to difference of temp between the two ends of wires. 1 A B. This effect is minimizing in three wires RTD bridge circuit by connecting a dummy wire C. If wires A and B are matched properly in terms of length and cross section area, then their impedance effects will cancel because each wire is in opposite position. c) by using guard rings For Platinum, its resistance changes by approximately 0.4 ohms per degree Celsius of temperature. If R1 = R2 =R3 = 100 22, Supply voltage is 10 V. Calculate the voltage the detector must resolve to define 1°C change in temperature. Answer: c Explanation: 15. But we must know the procedure how to use it and how to make the signal conditioning circuitry. Answer: b Explaination: Response time is longer than thermocouples. RTDs are more accurate but also larger and more expensive than thermocouples. 5. If we know the values of VS and VO, we can find Rg and then we can find the temperature value using calibration equation. The temperature sensor of the PAU series contains a sensor called "Platinum resistance thermometer detector" which is used along with thermocouple. A pinoybix mcq, quiz and reviewers. Because, whatever the materials actually we are using for making the RTD that should be pure. In this RTD, the change in resistance value is very small with respect to the temperature. The degree of change of the conductor’s resistance is a measure of the amount of radiation that has fallen on the detector. That is called resistance-temperature characteristics. A standard cell of 1.0185 V is used with a slide wire potentiometer. This wire is referred to as a temperature sensor. So, we need one calibration equation to find the temperature. Decrease resistance by 5% at 1c.­ 5. c) α must be zero Resistance Element is the main temperature sensing portion of the Resistance Temperature Detector. d) it gives accurate measurements Elements in this section are 100Ω .00385 curve. View Answer, 8. Due to that, the resistance of the wire will change which is undesirable.So, we don’t want to change the resistance of wire by any other unwanted changes except the temperature changes. Dec 27,2020 - Test: Electrical Engineering- 14 | 100 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. (ΔR/R G)/ ε. where. 1 ohm to 1 mega ohm C. More than one ohm D. None of these View Answer / Hide Answer. a) Due to down deformation, resistance of metal increases b) Due to down deformation, resistance of metal decreases c) It represents high strain rate d) It represents creep at constant rate. How RTDs are constructed. The degree of change of the conductor’s resistance is a measure of the amount of radiation that has fallen on the detector. Resistance thermometers or resistance temperature detector works on the principle of positive temperature coefficient of resistance i.e. These objective type High Voltage Engineering questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. If you have any queries regarding Semiconductor Electronics: Materials, Devices and Simple Circuits CBSE Class 12 Physics MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back … the value of resistance at initial temperature, the rise of temperature and; the temperature coefficient of resistance α o. α and β are the constants depends on the metals. It has good linear characteristics over a wide range of temperature. When IR radiation come. The standard resistance is 100 Ω at 0° C and the standard temperature coefficient is an alpha of .00385. 5. April … In two wires RTD Bridge, the dummy wire is absent. View Answer, 5. Choose the letter of the best answer in each questions. The variation of resistance of the metal with the variation of the temperature is given as. The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. c) a chemical transducer Because there are so few electrons that are mobile at room temperature, only a small amount of current will flow through the semiconductor at room temperature.If the material is heated up, however, many of the valence electrons obtain enough energy to escape from their places and, therefore, the resistance of the material decreases markedly at high temperatures. In the industrial RTD’s, the coil is protected by a stainless steel sheath or a protective tube. They are being used from many years to measure temperature … An RTD sensing element like any other thermometer, … a) low value of α is required This shows that electrical conductivity of a semiconductor increases with the increase of temperature, i.e., a semiconductor has a negative temperature coefficient of resistance. 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If we want to measure temperature with high accuracy, RTD is the only one solution in industries. Answer/Explanation. Specially developed for the Electrical Engineering freshers and … Dec 28,2020 - Test: Zener Diode | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. As temperature decreases, resistance decreases. This wire is referred to as a temperature sensor. This test is Rated positive by 94% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by Electrical Engineering (EE) teachers. A standard cell of 1.0185 V is used with a slide wire potentiometer. The type of force applied through die in forging is a) Tensile force b) Compressive force c) Shear force d) Any of the above. The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. In an a.c. generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B the maximum value of emf generated in the coil is (a) NABR (b) NABω (c) NABRω (d) NAB. Ans: a. Current . Thermistor is the short form for ‘Thermal Resistor’. Platinum has the temperature range of 650oC, and then the Copper and Nickel have 120oC and 300oC respectively. The efficiency of detection is. Platinum is used for industrial applications because ________ If P and V are the power and potential of device, the power consumed with a supply potential V 1 is. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Measurement of temperature with a resistance temperature detector is a matter of measuring resistance. D. Q.85. Dec 27,2020 - Test: Resistivity Temperature Coefficient Of Resistance | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. D. All of the above View Answer. Thus, the electric current through the RTD resistance must be kept sufficiently low and constant to avoid self-heating. The platinum resistance thermometer detector may also be described as "PT100". So, that it can be used in the hostile environment to reduce the chances of oxidation. Now, assume R1 = R2: Q2. MCQ; MCQs; Norton theorem; Parallel resistors; Pie of the day; Power; Power Factor; Power Systems; Practical; Questions; Reference charts; Resistors; Sensors; Series Parallel Networks; Thevenin theorem; Tips ; Transformers; Voltage divider; Wye to Delta conversion; Home Basic concepts Relationship between Resistance and Temperature. View Answer, 10. Other common electronics devices used to measure temperature include a thermocouple or a thermistor. 6. However, platinum is used as a primary element in such accurate temperature sensors due to its chemically inert nature. So, ultamitely increase resistance and current flow is change. b) negative temperature coefficient of resistance Similarly, as the temperature of the RTD resistance element increases, the electrical resistance, measured in ohms (Ω), increases. Unbalanced Wheatstone bridge method are invariably used to measure the resistance. a) Rt = Rref [1+t] The resistance tends to be almost linear with temperature – the higher the temperature, the larger the resistance. a) neutral temperature coefficient of resistance Pt100 is a resistance temperature detector, made of material Platinum (= Pt_) and its resistance value at 0 °C temperature is 100 ohm (=_100). The formula for determining Alpha is: A = R(100°C) - R(0°C) 100R (0°C) Typical Temperature Coefficients are: .003926 (99.999% Pure Plat. Q10. MCQ in AC-DC circuits ; MCQ in Resistors ; MCQ in Inductors ; MCQ in Capacitors ; Continue Practice Exam Test Questions Part 13 of the Series. So that, the lead wire errors and other calibration errors can be minimized. So, α and β values will change depending upon the metals. What will be the resistance of 100 W-220 V lamp, when not in use? View Answer, 7. (10 %) (2) This RTD is used in a bridge circuit (25°C). By supplying the constant electric current to the bridge circuit and measuring the resulting voltage drop across the resistor, the RTD resistance can be calculated. The purity of the platinum is checked by measuring R100 / R0. Dec 28,2020 - Test: Zener Diode | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. b) False The balance was obtained at 60 cm. Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. Given below are top 10 MCQ Questions on Sensors and their working. 55.5% C. 68.8% D. 84.7%. b) no change in resistance The time required for forward voltage or … When IR radiation come. 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Set of 1000+ multiple choice questions and answers of Manufacturing Process-I know the procedure how to make signal... Resistivity temperature coefficient of resistance | 20 questions MCQ Test has questions of electrical Engineering EE! Β are the power and potential of device, the metal ’ s come in many forms but... April 27, 2020 s Bharadwaj Reddy September 23, 2019 April 27, 2020 of 3. A Wheatstone bridge method, the balance was obtained at 82 cm variations with respective the. From the RTD resistance value using a calibration expression their working metal with the variation of the ’! Over a wide range of 650oC, and the device itself that causes a slight effect. Shows the resistance-temperature characteristics curve of the order of a non-metallic resistor that is wrapped around a ceramic glass... A transmitter or any other circuit connected with 2, 3 or 4 wires resistance with! And how to use a small detector and to focus the radiation on it sensors and their working device... Important to use it and how to make the signal conditioning circuitry Resistive circuits MCQ: Interactive multiple questions. Referred to as a primary element in such accurate temperature sensors Bimetallic strip – working, advantages and.! S, the resistance at 35°C of.00385 the platinum is checked by measuring the resistance View Answer 7. Is the short form for ‘ thermal resistor ’ 1 is ohms ( Ω ), are sensors used determine! By thermometer also increases the temperature of the following converter will be an I2R power dissipation by device! Networks below and stay updated with latest contests, videos, internships and jobs 4! Resistance, measured in ohms ( Ω ), are sensors used to measure temperature with High accuracy RTD. Thus, the expression can be used in the case of platinum, its changes... The metals to electrical and electronics Engineering, SCADA System: what is an alpha.00385... In use changes by approximately 0.4 ohms per degree Celsius of temperature, whatever the materials actually we using! Below figures - MCQs with answers Q1 this temperature is given as in temp copper or tungsten Pdf Question.. Answer, 6 R1 = R2: if R3 = Rg ; VO. Practice All areas of electrical Engineering ( EE ) preparation are more accurate but larger! Happen to have a multimeter with you to measure temperature sensor | types of temperature similar to resistance.