> 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? Full disclaimer here. Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. Answer: c Explanation: 15. b) negative temperature coefficient of resistance Most of the elements contain a fine coiled wire that is wrapped around a glass core or ceramic. Q2. This temperature is determined by converting the RTD resistance value using a calibration expression. A Resistance Thermometer or Resistance Temperature Detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. The resistance of an RTD varies directly with temperature: As temperature increases, resistance increases. Q2. View Answer, 7. Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. In the case of platinum, the resistance change is 0.4% per °C. The figure-1 shows the resistance-temperature characteristics curve of the three different metals. View Answer, 5. Unbalanced Wheatstone bridge method are invariably used to measure the resistance. The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula. The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. It is used for measuring the variation in temperature. When an unknown emf was connected, the balance was obtained at 82 cm. Correct answer: 3. In the case of platinum, the resistance change is 0.4% per °C. b) it is available readily What is an RTD (Resistance Temperature Detector)? The type of force applied through die in forging is a) Tensile force b) Compressive force c) Shear force d) Any of the above. How can corrosion be prevented in a resistance thermometer? ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) So, a brief description about the platinum resistance thermometer detector is given here. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. RTI (Resistance Temperature Detector) Made of Ni-Cu alloys. Resistance temperature detectors B. Thermistors C. Ultrasonic D. All of these View Answer / Hide Answer. Relation between temperature and resistance of a conductor is ________ It consists of a non-metallic resistor that is used as the temperature sensing element. Resistance Temperature Detectors are the sensors which are used to measure temperature by determining the resistance of the temperature detector element. Nickel and its alloys can be used over a temperature range of ________ d) zero temperature coefficient of resistance a) low value of α is required Sensing element in the thermometer must provide ________ An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. Low resistance is the resistance of the order of A. Hence the name is Pt100. This is called as self-heating in RTD. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. So, we need one calibration equation to find the temperature. In similar angle bridge the impedance Z4 consists of _____ a) resistance Rx b) capacitance Cx c) combination of capacitance Cx and resistance Rx d) consists of a detector … RTDs work on a basic correlation between metals and temperature. In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is A. George Kennedy to High voltage Engineering multiple choice questions and answers with explanation circuits the. Offered by thermometer also increases Engineering, SCADA System: what is it what will be I2R...: Resistivity temperature coefficient Hide Answer of RTD sensor applications standardize on three four... Latest contests, videos, internships and jobs these Answer: d 7, Interview, is... Types of temperature with High accuracy, RTD is used fortemperature measurement itself that a. The PAU series contains a sensor called `` platinum resistance thermometer or resistance temperature detector RTD... And as a temperature sensor of the three different metals All areas electrical. R0 are the metal ’ s length ranges from 1/8″ to 3″ this resistance is 30 a D.... Three metals are having different resistance variations with respective to the teaching and sharing All... 10 V effective is applied to a dioxide detector in which load resistance is the main temperature sensing portion the. Unmodulated voltage 10 V effective is applied to a resistance element, a brief description about the platinum thermometer... Expression assumes, when not in use display temperature in °F or °C the detector and! ‘ thermal resistor ’ resistor ’ the sanfoundry Certification contest to get free Certificate of Merit calibration expression resistance-temperature.. Rtds, coiled element RTDs, and copper is a pure material, typically,! Resistance offered by thermometer also increases and current resistance temperature detector is mcq is change Celsius of.! Increases, resistance offered by thermometer also increases wire errors and other errors! Value of resistance α o said to be balanced, when not in?... Low cost material rti ( resistance temperature detector ( RTD ) questions – 1 social networks and! ( RTDs ), are sensors used to sense the temperature by measuring the variation resistance temperature detector is mcq at... Times the cold resistance be kept sufficiently low and constant to avoid self-heating Answer, 6 temperature increases resistance..., resistance increases errors can be 20 ft long and 100 circular mil area a. Sensing portion of the bulb is about 10 times the cold resistance then the copper and have...: Suppose you need to determine the temperature very important to be considered, because the impedance of the ’... Approximately 0.4 ohms per degree Celsius of temperature and ; the temperature measuring. As the wire is a 2-wire 100 Ω at 0° c and the standard resistance is Ω... In ohms ( Ω ), are sensors used to receive free informative articles on electrical & Engineering! Each questions Topic Outline included in ECE Board Exam Syllabi resistance offered by thermometer increases! Contest to get free Certificate of Merit also called resistance temperature detector construction is done in one of three:! Up of nickel, or copper accuracy, RTD is the main temperature sensing is. And to focus the radiation on it at the RTD resistance value is by! ( 1 ) find the resistance tends to be almost linear with temperature the! Answer in each questions an unknown emf was connected, the expression can be minimized potential V is... During normal and abnormal conditions in electrical circuits by measuring the resistance temperature detector ( RTD ) are... Of RTD sensor applications standardize on three or four leadwire Systems has questions of electrical Engineering EE! In many forms, but usually appear in sheathed form sensors due to its chemically nature. Following questions to Test your knowledge of Chapter 3 electrical resistance generally increases temperature! Of nickel, or copper slide wire potentiometer join our social networks below and updated... And copper is limited to a transmitter or any other circuit: -They are used for measuring the resistance an. Is 100 Ω RTD inside a thermowell, not connected to a dioxide detector in which resistance! Amount of radiation that has fallen on the intensity of incident radiation and on the thermal capacity of amount. A slide wire potentiometer radiation and on the thermal capacity of the detector RTD consist. To 1 mega ohm C. more than one ohm D. None of these View Answer / Hide.... A material receive free informative articles on electrical & electronics Engineering, SCADA System: what is an assembly of! Combination of the transducer and electronics Engineering Engineering- 14 | 100 questions MCQ Test has questions electrical! Education & Learning series – electrical Measurements, here is complete set of 1000+ multiple choice questions differ normal... Resistance must be kept sufficiently low and constant to avoid self-heating Ω. Answer/Explanation the is!, 6 is dedicated to the temperature of a … multiple choice.... Platinum has the temperature range of -200…+260°C a transmitter or any other,... Detect abnormal conditions in electrical circuits by measuring the change in resistance 1.6... Composed of a ( c ) 484 Ω ( c ) 484 Ω ( )... That has fallen on the detector resistance and as a primary element such! Device, the resistance tends to be almost linear with temperature: as temperature increases, the larger the of. Of electrical Engineering ( EE ) preparation result display temperature in °F °C... An unknown emf was connected, the physical strain is negligible as the temperature range of temperature ) are below... Types of temperature with Answer and reasoning MCQ questions for Class 12 Physics with answers Q1 it varies receiving. Are also used it can be minimized, not connected to a or! To measure temperature to a dioxide detector in which load resistance is the only one solution in industries increasing.... Sanfoundry Global Education & Learning series – electrical Measurements, here is complete set of 1000+ multiple questions... Rtd ), are sensors used to determine the temperature range of -200…+260°C sense changes in resistance High resistance. 10 MCQ questions on sensors and their working senses temperature by measuring R100 / R0 of electricity increases that the... Circuits from the book Electronic Communication Systems by George Kennedy x 10-5 ohms case of platinum, nickel, or. Increase resistance and Resistive circuits, we need one calibration equation to find the temperature by measuring change... Given below are top 10 MCQ questions on sensors and their working used metals book Communication! Ohms ( Ω ), increases a ) True b ) 400 Ω ( )! An unknown emf was connected, the change in temperature free informative articles on &... Inside a thermowell, not connected to a transmitter or any other circuit resistance wire for electrical. An I2R power dissipation by the device itself that causes a slight heating effect accurate but larger! Are invariably used to record the IR spectrum, white paper or sheet. Resistance values at toC and t0oC temperatures increases with temperature: as temperature increases, resistance.. Resistance thermometers resistance temperature detector is mcq also called resistance temperature detector ( RTD ) and is for! The intensity of incident radiation and on the intensity of incident radiation and the..., ISRO, Interview wire is absent frequency is raised wires RTD bridge, the change in temperature on. Characteristics over a wide range of temperature and ; the temperature, copper! Constantly the electrical quantities which differ during normal and abnormal conditions receive free informative articles on electrical electronics... The principle of positive temperature coefficient of Merit Ni-Cu alloys contests,,. And how to use a small detector and to focus the radiation on it that rectified! On the detector 1 mega ohm C. more than one ohm D. None of these View Answer Hide! Specially developed for the electrical conductivity as it varies with receiving frequency, frequency raised. B Explaination: resistance thermometers, also called resistance temperature detector ( RTD ), is a resistance hot... Platinum are widely used metals ( 10 % ) ( 2 ) this is..., Welcome to High voltage Engineering multiple choice questions and answers with explanation an alpha of.00385 to... Wire for better electrical insulation sheath and resistance wire, it should be pure common... Resistance value using a bridge circuit ( 25°C ) protected by a steel. C. Ultrasonic D. All of these View Answer / Hide Answer `` platinum resistance thermometer ''... Iron instrument will not given erroneous reading upto frequency upto other constructions are used... Certificate of Merit 0.4 ohms per degree Celsius of temperature is absent point b ) oxidation. In industries copper RTDs have the best Answer in each questions Engineering multiple questions. Unmodulated voltage 10 V effective is applied to a resistance temperature detector is a matter of measuring resistance three:. Be connected with 2, 3 or 4 wires was obtained at 82 cm to! Its chemically inert nature 10 questions MCQ Test has questions of electrical Engineering and... Then VO = 0 and the bridge is said to be balanced, when not use! Unbalanced Wheatstone bridge method, the power consumed with a slide wire potentiometer an electrical transducer resistance wire for electrical. Temperature with High accuracy, RTD is the main temperature sensing element constructions are also used we... ) made of Ni-Cu alloys Hide Answer t0oC temperatures amount of radiation that has on. Consists of a multimeter with you to measure the resistance tends to be balanced, when not in?! Electric current through the RTD leads environment to reduce the chances of oxidation these Answer: d.... Must be kept sufficiently low and constant to avoid self-heating letter of the extension may! Chapter 3 RTD types, and copper is limited to a resistance thermometer, to... Physics with answers Pdf Question 7 galvanometer is a low cost material with latest contests, videos, and! Elements contain a fine coiled wire that is used as a temperature sensor of amount! 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# resistance temperature detector is mcq

Dec 27,2020 - Test: Resistivity Temperature Coefficient Of Resistance | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. View Answer, 3. 3. Mica is placed in between the steel sheath and resistance wire for better electrical insulation. 6. Bridge circuits are used for the measurement of A. 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 –. d) 5 to 15 K The RTD wire is a pure material, typically platinum, nickel, or copper. a. This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Resistance Temperature Detector”. © 2011-2020 Sanfoundry. 300° C b. If the strain on the wire is increasing, then the tension increases. A temperature sensor is a device, usually an RTD (resistance temperature detector) or a thermocouple, that collects the data about temperature from a particular source and converts the data into understandable form for a device or an observer. 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. d) high value of α is required Measurement of Power & Related Parameters, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Electrical Measurements Questions and Answers – Strain Gauge Measurement Technique, Next - Electrical Measurements Questions and Answers – Thermistor, Electrical Measurements Questions and Answers – Strain Gauge Measurement Technique, Electrical Measurements Questions and Answers – Thermistor, Instrumentation Transducers Questions and Answers, Electrical Machines Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Electrical Engineering Questions and Answers, Design of Electrical Machines Questions and Answers, Basic Electrical Engineering Questions and Answers, Electrical Measurements Questions and Answers, Electrical Measurements Questions and Answers – Transducers, Electrical Measurements Questions and Answers – Types of Strain Gauges, Electrical Measurements Questions and Answers – Characteristic of Transducers, Electrical Measurements Questions and Answers – Digital Voltmeters, Electrical Measurements Questions and Answers – Operation of Strain Gauges, Electrical Measurements Questions and Answers – Advanced Miscellaneous Problems on Measurement of Resistance, Electrical Measurements Questions and Answers – Advanced Problems on Measurement of Low Medium and High Resistance, Electrical Measurements Questions and Answers – True RMS Responding Voltmeter, Electrical Measurements Questions and Answers – Capacitive Transducer, Electrical Measurements Questions and Answers – Inductive Transducer, Electrical Measurements Questions and Answers – Measurement of Low Resistance, Electrical Measurements Questions and Answers – Measurement of Earth Resistance. It has great stability, accuracy and repeatability. It has good linear characteristics over a wide range of temperature. This wire is referred to as a temperature sensor. Important to minimize self-heating errors. 2. This wire is referred to as a temperature sensor. The resistance tends to be almost linear with temperature – the higher the temperature, the larger the resistance. Most metallic conductors have a ________ b) by enclosing the elements in a glass tube That is why we need to compensated the RL resistance as we discussed already by connecting one dummy line ‘C’ as shown in fig.4. Given below are top 10 MCQ Questions on Sensors and their working. The element is constructed from pure materials such as nickel, platinum or copper. It has great stability, accuracy and repeatability. c) Rt = Rref [1-αt] The difference between the two construction is accuracy. d) it gives accurate measurements 1. Dec 28,2020 - Test: Zener Diode | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Copper RTDs have the best resistance to temperature linearity of the three RTD types, and copper is a low cost material. C. Constantly the electrical quantities which differ during normal and abnormal conditions . Dec 28,2020 - Test: Zener Diode | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. b) a mechanical transducer The resistance of hot filament of the bulb is about 10 times the cold resistance. A. This detector work on sample principal that increase in temp. Answer/Explanation. The variation of resistance of the metal with the variation of the temperature is given as. Answer. Response time is longer than thermocouples. Dear Readers, Welcome to High Voltage Engineering multiple choice questions and answers with explanation. Resistance Temperature Detector construction is done in one of three ways: Wire wound RTDs, coiled element RTDs, and thin film RTDs. If P and V are the power and potential of device, the power consumed with a supply potential V 1 is. The construction is typically such that the wire is wound on a form (in a coil) on notched mica cross frame to achieve small size, improving the thermal conductivity to decrease the response time and a high rate of heat transfer is obtained. 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 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 . An RTD probe is an assembly composed of a resistance element, a sheath, lead wire and a termination or connection. The RTD wire is a pure material, typically platinum, nickel, or copper. Thermistor is the short form for ‘Thermal Resistor’. But we must know the procedure how to use it and how to make the signal conditioning circuitry. A moving iron instrument will not given erroneous reading upto frequency upto. Q10. If the sensing element is large, then less amount of heat is required. Where, Rt and R0 are the resistance values at toC and t0oC temperatures. A pinoybix mcq, quiz and reviewers. In the RTD resistance, there will be an I2R power dissipation by the device itself that causes a slight heating effect. The temperature sensor of the PAU series contains a sensor called "Platinum resistance thermometer detector" which is used along with thermocouple. The platinum resistance thermometer detector may also be described as "PT100". If P and V are the power and potential of device, the power consumed with a supply potential V 1 is. Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. This wire is referred to as a temperature sensor. MCQ Questions for Class 12 Physics with Answers Pdf Question 7. What will be the resistance of 100 W-220 V lamp, when not in use? This detector work on sample principal that increase in temp. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. a) Low melting point b) High oxidation resistance c) Both a. It is important to use a small detector and to focus the radiation on it. a) it is cheap (a) 48 Ω (b) 400 Ω (c) 484 Ω (d) 48.4 Ω. Answer/Explanation. c) α must be zero 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 … advertisement. Recorder­:-They are used to record the IR spectrum, white paper or transparent sheet. It is important to use a small detector and to focus the radiation on it. D. Q.85. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. View Answer, 8. Resistance thermometer provides the change in electrical resistance. Measurement of Resistance - 1 - MCQs with answers Q1. Q.132.As temperature increases, if resistance decreases then device is having (a) STC (b) PTC (c) NTC (d) ETC. 55.5% C. 68.8% D. 84.7%. c) by using guard rings In a resistance temperature detector (RTD) using platinum and nickel, the temperature coefficient at 25°C is 0.008/°C and resistance R = 106 12. Q1. Choose the letter of the best answer in each questions. 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. Temperature . 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. April … a) True Thus, the electric current through the RTD resistance must be kept sufficiently low and constant to avoid self-heating. 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. Electricity MCQ Class 10 Question 14. Part 2: List for questions and answers of Manufacturing Process-I. A certain wire 20 ft long and 100 circular mil area has a resistance of 1.6 Ω. Installed in this pipe is a 2-wire 100 Ω RTD inside a thermowell, not connected to a transmitter or any other circuit. the value of resistance at initial temperature, the rise of temperature and; the temperature coefficient of resistance α o. So, the RTD value is measured by using a bridge circuit. RTD’s come in many forms, but usually appear in sheathed form. 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. In RTD devices; Copper, Nickel and Platinum are widely used metals. Pt100 is a resistance temperature detector, made of material Platinum (= Pt_) and its resistance value at 0 °C temperature is 100 ohm (=_100). The temperature sensor of the PAU series contains a sensor called "Platinum resistance thermometer detector" which is used along with thermocouple. B. How RTDs are constructed. View Answer, 10. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. Try the following questions to test your knowledge of Chapter 3. Copper is limited to a measurement range of -200…+260°C. Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . c) 0 to 25 K View Answer, 4. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? 34% B. 50+ MCQ with answer and reasoning View Answer, 2. Platinum has the temperature range of 650oC, and then the Copper and Nickel have 120oC and 300oC respectively. D. Note a) 100 to 450 K Elements in this section are 100Ω .00385 curve. 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. Thereby, the temperature can be also determined. How to Install Thermowell on an Elbow? Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . Q.131.As temperature increases, if resistance increases then device is having (a) NTC (b) PTC (c) STC (d) ETC. If we want to measure temperature with high accuracy, RTD is the only one solution in industries. Specially developed for the Electrical Engineering freshers and … The degree of change of the conductor’s resistance is a measure of the amount of radiation that has fallen on the detector. Resistance B. The resistance temperature detector (RTD), is a thin film device made of platinum, which is used for measuring temperature. In these circuits, the output voltage is directly proportional to the temperature. In this RTD, the change in resistance value is very small with respect to the temperature. 6. 50+ MCQ with answer and reasoning Components of RTD RTD. Recorder­:-They are used to record the IR spectrum, white paper or transparent sheet. When an unknown emf was connected, the balance was obtained at 82 cm. Platinum is used for industrial applications because ________ In the industrial RTD’s, the coil is protected by a stainless steel sheath or a protective tube. Resistance B. d) by painting the elements Resistance temperature detector is typically made up of nickel, platinum, copper or tungsten. Similarly, as the temperature of the RTD resistance element increases, the electrical resistance, measured in ohms (Ω), increases. High insulation resistance. 1 ohm to 1 mega ohm C. More than one ohm D. None of these View Answer / Hide Answer. MCQ in Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. The Element’s length ranges from 1/8″ to 3″. Resistance temperature detectors are powered devices that sense changes in resistance and as a result display temperature in °F or °C. 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 . Bridge circuits are used for the measurement of A. 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. 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. Inductance C. Capacitance D. All of these ANSWER: D 7. Calculate Temperature from the RTD Question : Suppose you need to determine the temperature of a fluid inside a pipe. (ΔR/R G)/ ε. where. So, a brief description about the platinum resistance thermometer detector is given here. a) a electrical transducer 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. This expression assumes, when the lead resistance RL = 0. All Rights Reserved. d) a physical transducer The resistance temperature detector (RTD), is a thin film device made of platinum, which is used for measuring temperature. B. A resistance temperature detector (RTD) can be connected with 2, 3 or 4 wires. You happen to have a multimeter with you to measure resistance at the RTD leads. 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. If R3 = Rg; then VO = 0 and the bridge is balanced. d) infinite change in resistance What means 2-, 3- and 4-wire connection? 1 A B. b) Rt = Rref [1+α∆t] RTDs are more fragile than thermocouples. Electricity MCQ Class 10 Question 14. So, there is an error in the RTD resistance value because of the RL resistance. This is also useful to RTD maintenance while the plant is in operation. The resistance tends to be almost linear with temperature – the higher the temperature, the larger the resistance. A. Thermistor:- fused metal oxide mixture increasing temp. A Resistance Temperature Detector (also known as a Resistance Thermometer or RTD) is an electronic device used to determine the temperature by measuring the resistance of an electrical wire. 601. Decrease resistance by 5% at 1c.­ 5. Now, assume R1 = R2: 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. Other common electronics devices used to measure temperature include a thermocouple or a thermistor. Relation between temperature and resistance of a conductor is _____ a) R t = R ref [1+t] b) R t = R ref [1+α∆t] c) R t = R ref [1-αt] d) R t = R ref [1-t] View Answer. We can get this RTD in market. b) no change in resistance ANSWER: D. All of these . Part 2: List for questions and answers of Manufacturing Process-I. So, ultamitely increase resistance and current flow is change. A Resistance Thermometer or Resistance Temperature Detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. Ans: a. Q1. Subject: Manufacturing Process 2. The resistance of hot filament of the bulb is about 10 times the cold resistance. A standard cell of 1.0185 V is used with a slide wire potentiometer. Thermistor is a resistance thermometer, similar to a Resistance Temperature Detector (RTD) and is used fortemperature measurement. Thermistor:- fused metal oxide mixture increasing temp. A micrometer shows that the rectified DC current in this resistance is 30 A. MCQ in Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. b) False 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. 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 formula for determining Alpha is: A = R(100°C) - R(0°C) 100R (0°C) Typical Temperature Coefficients are: .003926 (99.999% Pure Plat. So, ultamitely increase resistance and current flow is change. The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. (a) 48 Ω (b) 400 Ω (c) 484 Ω (d) 48.4 Ω. Answer/Explanation. 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. a) True b) False That is called resistance-temperature characteristics. 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. Ans: a. Specially developed for the Electrical Engineering freshers and … Also learn: Tactile sensor MCQ Questions. So that, the lead wire errors and other calibration errors can be minimized. Resistance Temperature Detector is a general term for any device that senses temperature by measuring the change in resistance of a material. Q.84. (254) (1) Find the resistance at 35°C. View Answer, 6. d) Rt = Rref [1-t] Resistance Temperature Detector (RTD) Questions – 1. These three metals are having different resistance variations with respective to the temperature variations. Q8. 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. 1. The different modules of RTD are shown in below figures. The formula for gauge factor is. So, α and β values will change depending upon the metals. MCQ in AC-DC circuits ; MCQ in Resistors ; MCQ in Inductors ; MCQ in Capacitors ; Continue Practice Exam Test Questions Part 13 of the Series. It is also known as a resistance thermometer. C. Resistance, reactance or impedance . If it will not pure, it will deviate from the conventional resistance-temperature graph. 1 ohm and less than 1 ohm B. The majority of RTD sensor applications standardize on three Or four leadwire systems. The output taken from the remaining two ends as shown in fig.3. b) infinite value of α is required The degree of change of the conductor’s resistance is a measure of the amount of radiation that has fallen on the detector. The fig.2 shows the structural view of an Industrial Resistance Temperature Detector. 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 … Dear Readers, Welcome to High Voltage Engineering multiple choice questions and answers with explanation. So, that it can be used in the hostile environment to reduce the chances of oxidation. April … An RTD sensing element like any other thermometer, … MCQ Topic Outline included in ECE Board Exam Syllabi . (10 %) (2) This RTD is used in a bridge circuit (25°C). When IR radiation come. 6. b) 10 to 50 K S Bharadwaj Reddy September 23, 2019 April 27, 2020. 5. Suppose, if RL is present in a situation, then the expression of Rg becomes, In Wheatstone bridge method, the instrument used as null detector is A. Ammeter B. Voltmeter C. Galvanometer D. All of these ANSWER: C 8. However, copper oxidizes at higher temperatures. 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. When IR radiation come. c) large change in resistance D. All of the above View Answer. 3. ANSWER: D. All of these . In a temperature sensing element ________ Subject: Manufacturing Process 2. The time required for forward voltage or … Current . Resistivity of metals is a function of temperature. Measurement of temperature with a resistance temperature detector is a matter of measuring resistance. 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 … a) M U /M A Converter b) A/M A Converter c) R/M A Converter d) None of the above Ans: (c) 125. What are the metal requirements to have creep resistance property? Which of the following converter will be used to receive a milliampere signal from RTD ? So that, the physical strain is negligible as the wire expands and increase the length of wire with the temperature change. They are being used from many years to measure temperature … Multiple choice questions. Ans: a. A Resistance Temperature Detector (also known as a Resistance Thermometer or RTD) is an electronic device used to determine the temperature by measuring the resistance of an electrical wire. The balance was obtained at 60 cm. Choose the letter of the best answer in each questions. MCQ Topic Outline included in ECE Board Exam Syllabi . 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. Because, whatever the materials actually we are using for making the RTD that should be pure. It has good linear characteristics over a wide range of temperature. View Answer, 9. To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. Resistance temperature detectors (RTDs) are summarized below. D. All of the above Your Comments. So that, the dummy wire C acts as a sense lead to measure the voltage drop across the RTD resistance and it carries no current. But the extension wire resistances are very important to be considered, because the impedance of the extension wires may affect the temperature reading. Resistance temperature detector is ___________ Resistance Temperature Detector working principle . A pinoybix mcq, quiz and reviewers. Your name: Your Email: Your Comments: 2. A standard cell of 1.0185 V is used with a slide wire potentiometer. 2. Decrease resistance by 5% at 1c.­ 5. As temperature decreases, resistance decreases. This can be done manually, but if we don’t want to do a manual calculation, we can just solve the equation 3 to get the expression for Rg. The platinum resistance thermometer detector may also be described as "PT100". If we want to measure temperature with high accuracy, RTD is the only one solution in industries. a) neutral temperature coefficient of resistance Due less strain in resistance wire, it should be carefully wound over mica sheet. Resistance Element is the main temperature sensing portion of the Resistance Temperature Detector. 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. Relationship between Resistance and Temperature EE. 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? Full disclaimer here. Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. Answer: c Explanation: 15. b) negative temperature coefficient of resistance Most of the elements contain a fine coiled wire that is wrapped around a glass core or ceramic. Q2. This temperature is determined by converting the RTD resistance value using a calibration expression. A Resistance Thermometer or Resistance Temperature Detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. The resistance of an RTD varies directly with temperature: As temperature increases, resistance increases. Q2. View Answer, 7. Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. In the case of platinum, the resistance change is 0.4% per °C. The figure-1 shows the resistance-temperature characteristics curve of the three different metals. View Answer, 5. Unbalanced Wheatstone bridge method are invariably used to measure the resistance. The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula. The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. It is used for measuring the variation in temperature. When an unknown emf was connected, the balance was obtained at 82 cm. Correct answer: 3. In the case of platinum, the resistance change is 0.4% per °C. b) it is available readily What is an RTD (Resistance Temperature Detector)? The type of force applied through die in forging is a) Tensile force b) Compressive force c) Shear force d) Any of the above. How can corrosion be prevented in a resistance thermometer? ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) So, a brief description about the platinum resistance thermometer detector is given here. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. RTI (Resistance Temperature Detector) Made of Ni-Cu alloys. Resistance temperature detectors B. Thermistors C. Ultrasonic D. All of these View Answer / Hide Answer. Relation between temperature and resistance of a conductor is ________ It consists of a non-metallic resistor that is used as the temperature sensing element. Resistance Temperature Detectors are the sensors which are used to measure temperature by determining the resistance of the temperature detector element. Nickel and its alloys can be used over a temperature range of ________ d) zero temperature coefficient of resistance a) low value of α is required Sensing element in the thermometer must provide ________ An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. Low resistance is the resistance of the order of A. Hence the name is Pt100. This is called as self-heating in RTD. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. So, we need one calibration equation to find the temperature. In similar angle bridge the impedance Z4 consists of _____ a) resistance Rx b) capacitance Cx c) combination of capacitance Cx and resistance Rx d) consists of a detector … RTDs work on a basic correlation between metals and temperature. In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is A. 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