The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. Q.84. a) low value of α is required In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is A. 1 ohm to 1 mega ohm C. More than one ohm D. None of these View Answer / Hide Answer. In two wires RTD Bridge, the dummy wire is absent. B. b) it is available readily If R3 = Rg; then VO = 0 and the bridge is balanced. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . b) by enclosing the elements in a glass tube That is called resistance-temperature characteristics. The variation of resistance of the metal with the variation of the temperature is given as. Choose the letter of the best answer in each questions. A resistance temperature detector (RTD) can be connected with 2, 3 or 4 wires. How to Install Thermowell on an Elbow? 2. Answer/Explanation. Ans: a. a) a electrical transducer 6. In the RTD resistance, there will be an I2R power dissipation by the device itself that causes a slight heating effect. Installed in this pipe is a 2-wire 100 Ω RTD inside a thermowell, not connected to a transmitter or any other circuit. The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. 50+ MCQ with answer and reasoning The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. We hope the given NCERT MCQ Questions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits with Answers Pdf free download will help you. 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. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. The formula for gauge factor is: ΔR * R G * ε (ΔR/R G)/ ε (ΔR/R G)*ε (ΔR + R G)/ ε; Correct answer: 2. The type of force applied through die in forging is a) Tensile force b) Compressive force c) Shear force d) Any of the above. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. 50+ MCQ with answer and reasoning Platinum is used for industrial applications because ________ Mica is placed in between the steel sheath and resistance wire for better electrical insulation. An RTD sensing element like any other thermometer, … The time required for forward voltage or … b) infinite value of α is required b) 10 to 50 K View Answer, 3. Sensing element in the thermometer must provide ________ Thermistor is the short form for ‘Thermal Resistor’. How RTDs are constructed. a. The standard resistance is 100 Ω at 0° C and the standard temperature coefficient is an alpha of .00385. The formula for gauge factor is. 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 … Dec 27,2020 - Test: Electrical Engineering- 14 | 100 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. 124.A resistance temperature detector (RTD) is used to sense the temperature. View Answer, 10. d) zero temperature coefficient of resistance Q.131.As temperature increases, if resistance increases then device is having (a) NTC (b) PTC (c) STC (d) ETC. What will be the resistance of 100 W-220 V lamp, when not in use? a) Rt = Rref [1+t] 300° C b. 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. D. Note When IR radiation come. 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. MCQ in AC-DC circuits ; MCQ in Resistors ; MCQ in Inductors ; MCQ in Capacitors ; Continue Practice Exam Test Questions Part 13 of the Series. The fig.2 shows the structural view of an Industrial Resistance Temperature Detector. A micrometer shows that the rectified DC current in this resistance is 30 A. the value of resistance at initial temperature, the rise of temperature and; the temperature coefficient of resistance α o. The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. Electricity MCQ Class 10 Question 14. The temperature sensor of the PAU series contains a sensor called "Platinum resistance thermometer detector" which is used along with thermocouple. Platinum has the temperature range of 650oC, and then the Copper and Nickel have 120oC and 300oC respectively. This wire is referred to as a temperature sensor. When an unknown emf was connected, the balance was obtained at 82 cm. It is important to use a small detector and to focus the radiation on it. What are the metal requirements to have creep resistance property? What means 2-, 3- and 4-wire connection? So, that it can be used in the hostile environment to reduce the chances of oxidation. In Wheatstone bridge method, the instrument used as null detector is A. Ammeter B. Voltmeter C. Galvanometer D. All of these ANSWER: C 8. Current . Resistance Temperature Detector (RTD) is a temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. Resistance thermometer provides the change in electrical resistance. Measurement of temperature with a resistance temperature detector is a matter of measuring resistance. Ans: a. The output taken from the remaining two ends as shown in fig.3. A. Voltage . RTDs are more fragile than thermocouples. Elements in this section are 100Ω .00385 curve. Unbalanced Wheatstone bridge method are invariably used to measure the resistance. c) it is a noble metal Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. High insulation resistance. 34% B. The electrical resistance generally increases with temperature, and the device is defined as having a positive temperature coefficient. The Element’s length ranges from 1/8″ to 3″. Answer: c Explanation: 15. Components of RTD RTD. This α o is called temperature coefficient of resistance of that substance at 0 o C. From the above equation, it is clear that the change in electrical resistance of any substance due to temperature mainly depends upon three factors –. An RTD probe is an assembly composed of a resistance element, a sheath, lead wire and a termination or connection. a) it is cheap (254) (1) Find the resistance at 35°C. Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. Temperature . For Platinum, its resistance changes by approximately 0.4 ohms per degree Celsius of temperature. The purity of the platinum is checked by measuring R100 / R0. They are being used from many years to measure temperature … Low resistance is the resistance of the order of A. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Resistance temperature detectors (RTDs) are summarized below. Measurement of Resistance - 1 - MCQs with answers Q1. (10 %) (2) This RTD is used in a bridge circuit (25°C). Answer: b Explaination: Inductance C. Capacitance D. All of these View Answer / Hide Answer . Which of the following converter will be used to receive a milliampere signal from RTD ? But the extension wire resistances are very important to be considered, because the impedance of the extension wires may affect the temperature reading. There are two commonly used industrial grade RTDs established by DIN- IEC-751 (International Electric Code) Class B + .30°C and Class A + .15°C @ 0°C. d) Rt = Rref [1-t] Decrease resistance by 5% at 1c.­ 5. Pt100 is a resistance temperature detector, made of material Platinum (= Pt_) and its resistance value at 0 °C temperature is 100 ohm (=_100). Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. 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. 401. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. Resistance B. What will be the resistance of 100 W-220 V lamp, when not in use? Q1. If P and V are the power and potential of device, the power consumed with a supply potential V 1 is. This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Resistance Temperature Detector”. Resistance thermometers or resistance temperature detector works on the principle of positive temperature coefficient of resistance i.e. These three metals are having different resistance variations with respective to the temperature variations. d) a physical transducer 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 . α and β are the constants depends on the metals. It has great stability, accuracy and repeatability. A pinoybix mcq, quiz and reviewers. So, a brief description about the platinum resistance thermometer detector is given here. a) True The resistance of hot filament of the bulb is about 10 times the cold resistance. Thermistor is a resistance thermometer, similar to a Resistance Temperature Detector (RTD) and is used fortemperature measurement. When IR radiation come. View Answer, 7. 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 … If we want to measure temperature with high accuracy, RTD is the only one solution in industries. This wire is referred to as a temperature sensor. 5. 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. Selectivity varies with receiving frequency, frequency is raised. This expression is for huge range of temperature. So, there is an error in the RTD resistance value because of the RL resistance. MCQ Topic Outline included in ECE Board Exam Syllabi . Answer: c Explanation: 15. So, we need one calibration equation to find the temperature. Resistance Temperature Detector construction is done in one of three ways: Wire wound RTDs, coiled element RTDs, and thin film RTDs. Due less strain in resistance wire, it should be carefully wound over mica sheet. A pinoybix mcq, quiz and reviewers. Similarly, as the temperature of the RTD resistance element increases, the electrical resistance, measured in ohms (Ω), increases. d) high value of α is required View Answer. Relationship between Resistance and Temperature EE. 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 … Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Temperature; 1) A platinum resistance thermometer has a resistance of 2 ohm at 0° C and 3 ohm at 100° C. What will be the temperature when resistance indicates 5 ohm? Subject: Manufacturing Process 2. View Answer, 8. What is an RTD (Resistance Temperature Detector)? Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. MCQ in Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. Electrical Engineering MCQ. A certain wire 20 ft long and 100 circular mil area has a resistance of 1.6 Ω. 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. It is also known as a resistance thermometer. ANSWER: D. All of these . Other common electronics devices used to measure temperature include a thermocouple or a thermistor. Thermistor:- fused metal oxide mixture increasing temp. Dear Readers, Welcome to High Voltage Engineering multiple choice questions and answers with explanation. advertisement. b) False This may also cause an erroneous reading. b) False a) no voltage drop across the circuit b) power dissipation is high c) temperature of the circuit is high d) no current flows Answer: d 26. Dec 28,2020 - Test: Zener Diode | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This expression assumes, when the lead resistance RL = 0. The resistance temperature detector (RTD) measures the electrical conductivity as it varies with temperature. It consists of a non-metallic resistor that is used as the temperature sensing element. If we know the values of VS and VO, we can find Rg and then we can find the temperature value using calibration equation. Thereby, the temperature can be also determined. You happen to have a multimeter with you to measure resistance at the RTD leads. S Bharadwaj Reddy September 23, 2019 April 27, 2020. Electricity MCQ Class 10 Question 14. The resistance temperature detector (RTD), is a thin film device made of platinum, which is used for measuring temperature. , frequency is raised times the cold resistance they are being used many. Rt and R0 are the power and potential of device, the power potential! Variation in temperature depends on the detector larger the resistance temperature detector ( RTD and... Wire is absent years to measure temperature less strain in resistance, when the through! The electric current through the RTD resistance value using a calibration expression be balanced, the... 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