The RTD wire is a pure material, typically platinum, nickel, or copper. In two wires RTD Bridge, the dummy wire is absent. What is Temperature Sensor | Types of Temperature Sensors Bimetallic strip – Working , advantages and Disadvantages. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. © 2011-2020 Sanfoundry. b) by enclosing the elements in a glass tube However, platinum is used as a primary element in such accurate temperature sensors due to its chemically inert nature. It is also known as a resistance thermometer. It is used for measuring the variation in temperature. 1. In the industrial RTD’s, the coil is protected by a stainless steel sheath or a protective tube. In RTD devices; Copper, Nickel and Platinum are widely used metals. Answer/Explanation. Dear Readers, Welcome to High Voltage Engineering multiple choice questions and answers with explanation. Similarly, as the temperature of the RTD resistance element increases, the electrical resistance, measured in ohms (Ω), increases. Bridge circuits are used for the measurement of A. The RTD wire is a pure material, typically platinum, nickel, or copper. View Answer. 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. Electrical Engineering MCQ. 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. 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. 1. Try the following questions to test your knowledge of Chapter 3. Temperature coefficient, or Alpha, is the term given to the average resistance/temperature relationship of an RTD over the temperature span of 0-100°C and is expressed as ohm/ohm/0°C. 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. We can get this RTD in market. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? a) M U /M A Converter b) A/M A Converter c) R/M A Converter d) None of the above Ans: (c) 125. This wire is referred to as a temperature sensor. 3. Resistance Temperature Detector construction is done in one of three ways: Wire wound RTDs, coiled element RTDs, and thin film RTDs. Dec 27,2020 - Test: Electrical Engineering- 14 | 100 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Low resistance is the resistance of the order of A. This wire is referred to as a temperature sensor. A micrometer shows that the rectified DC current in this resistance is 30 A. 6. 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. 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This is called as self-heating in RTD. Subject: Manufacturing Process 2. Because, whatever the materials actually we are using for making the RTD that should be pure. 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 … The metal having the lowest temperature coefficient of resistance is (a) gold (b) copper (c) aluminium (d) kanthal. Installed in this pipe is a 2-wire 100 Ω RTD inside a thermowell, not connected to a transmitter or any other circuit. MCQs in Semiconductor Fundamentals ; MCQs in Transistor Components ; MCQs in Circuit Analysis and Design ; MCQs in Special Services (Photo Electric, Photo voltaic) Continue Practice Exam Test Questions Part 9 of the Series. So, ultamitely increase resistance and current flow is change. a) 100 to 450 K When IR radiation come. This may also cause an erroneous reading. A Resistance Thermometer or Resistance Temperature Detector is a device which used to determine the temperature by measuring the resistance of pure electrical wire. View Answer, 9. Dec 28,2020 - Test: Zener Diode | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. 6. Resistivity of metals is a function of temperature. Sensing element in the thermometer must provide ________ This detector work on sample principal that increase in temp. 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 –. If it will not pure, it will deviate from the conventional resistance-temperature graph. (ΔR/R G)/ ε. where. Resistance temperature detectors (RTDs) are summarized below. Answer. This temperature is determined by converting the RTD resistance value using a calibration expression. In Wheatstone bridge method, the instrument used as null detector is A. Ammeter B. Voltmeter C. Galvanometer D. All of these ANSWER: C 8. Sanfoundry Global Education & Learning Series – Electrical Measurements. Resistance temperature detectors are powered devices that sense changes in resistance and as a result display temperature in °F or °C. D. Note The standard resistance is 100 Ω at 0° C and the standard temperature coefficient is an alpha of .00385. 300° C b. a. Explanation: Resistance temperature detector is an electrical transducer. This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Resistance Temperature Detector”. Relationship between Resistance and Temperature EE. Electricity MCQ Class 10 Question 14. To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. Decrease resistance by 5% at 1c.­ 5. The type of force applied through die in forging is a) Tensile force b) Compressive force c) Shear force d) Any of the above. So, α and β values will change depending upon the metals. 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 … Important to minimize self-heating errors. Thermistor:- fused metal oxide mixture increasing temp. How RTDs are constructed. b) no change in resistance 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. Copper RTDs have the best resistance to temperature linearity of the three RTD types, and copper is a low cost material. April … The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. A pinoybix mcq, quiz and reviewers. Q1. RTD’s come in many forms, but usually appear in sheathed form. Current . (10 %) (2) This RTD is used in a bridge circuit (25°C). As the temperature is increased more valence electrons cross over to the conduction band and conductivity increases. Specially developed for the Electrical Engineering freshers and … c) by using guard rings Recorder­:-They are used to record the IR spectrum, white paper or transparent sheet. That is called resistance-temperature characteristics. When IR radiation come. This wire is referred to as a temperature sensor. The output taken from the remaining two ends as shown in fig.3. Temperature . Resistance Temperature Detector is a general term for any device that senses temperature by measuring the change in resistance of a material. a) neutral temperature coefficient of resistance What is an RTD (Resistance Temperature Detector)? Calculate Temperature from the RTD Question : Suppose you need to determine the temperature of a fluid inside a pipe. Platinum is used for industrial applications because ________ Unbalanced Wheatstone bridge method are invariably used to measure the resistance. Resistance and Resistive circuits MCQ: Interactive multiple choice questions or quiz on resistance and resistive circuits. 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. Dear Readers, Welcome to High Voltage Engineering multiple choice questions and answers with explanation. Resistance thermometer provides the change in electrical resistance. View Answer, 4. Pt100 is a resistance temperature detector, made of material Platinum (= Pt_) and its resistance value at 0 °C temperature is 100 ohm (=_100). MCQ in Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. 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. Resistance thermometers or resistance temperature detector works on the principle of positive temperature coefficient of resistance i.e. d) it gives accurate measurements What will be the resistance of 100 W-220 V lamp, when not in use? 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. c) large change in resistance Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . Resistance Temperature Detectors are the sensors which are used to measure temperature by determining the resistance of the temperature detector element. Relationship between Resistance and Temperature EE. Decrease resistance by 5% at 1c.­ 5. A. Voltage . 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. d) infinite change in resistance Answer: c Explanation: 15. Resistance Temperature Detector (RTD) Questions – 1. 50+ MCQ with answer and reasoning So, a brief description about the platinum resistance thermometer detector is given here. The platinum resistance thermometer detector may also be described as "PT100". D. Q.85. View Answer, 7. In this RTD, the change in resistance value is very small with respect to the temperature. Choose the letter of the best answer in each questions. The efficiency of detection is. b) it is available readily RTI (Resistance Temperature Detector) Made of Ni-Cu alloys. The sensor is the combination of the transducer and electronics that measure the resistance. 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. Q2. 6. Ans: a. The change in temperature depends on the intensity of incident radiation and on the thermal capacity of the detector. Resistance Temperature Detector (RTD) is a temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. In a temperature sensing element ________ Resistance temperature detector is ___________ If the strain on the wire is increasing, then the tension increases. (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. April … In the case of platinum, the resistance change is 0.4% per °C. A certain wire 20 ft long and 100 circular mil area has a resistance of 1.6 Ω. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. 50+ MCQ with answer and reasoning Where, Rt and R0 are the resistance values at toC and t0oC temperatures. The temperature sensor of the PAU series contains a sensor called "Platinum resistance thermometer detector" which is used along with thermocouple. (a) 48 Ω (b) 400 Ω (c) 484 Ω (d) 48.4 Ω. Answer/Explanation. Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. A. MCQ in AC-DC circuits ; MCQ in Resistors ; MCQ in Inductors ; MCQ in Capacitors ; Continue Practice Exam Test Questions Part 13 of the Series. Elements in this section are 100Ω .00385 curve. b) False 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. These three metals are having different resistance variations with respective to the temperature variations. S Bharadwaj Reddy September 23, 2019 April 27, 2020. 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. b) negative temperature coefficient of resistance 55.5% C. 68.8% D. 84.7%. 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. Q8. 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. 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? a) Rt = Rref [1+t] The balance was obtained at 60 cm. Due less strain in resistance wire, it should be carefully wound over mica sheet. a) Low melting point b) High oxidation resistance c) Both a. A moving iron instrument will not given erroneous reading upto frequency upto. The degree of change of the conductor’s resistance is a measure of the amount of radiation that has fallen on the detector. Inductance C. Capacitance D. All of these View Answer / Hide Answer . b) Rt = Rref [1+α∆t] d) zero temperature coefficient of resistance Which of the following converter will be used to receive a milliampere signal from RTD ? d) Rt = Rref [1-t] So, ultamitely increase resistance and current flow is change. 3. The variation of resistance of the metal with the variation of the temperature is given as. 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 … In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is A. So, that it can be used in the hostile environment to reduce the chances of oxidation. 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. View Answer, 8. Q.84. d) 5 to 15 K Full disclaimer here. The electrical resistance generally increases with temperature, and the device is defined as having a positive temperature coefficient. ANSWER: D. All of these . Resistance temperature detectors B. Thermistors C. Ultrasonic D. All of these View Answer / Hide Answer. It is important to use a small detector and to focus the radiation on it. Wheatstone bridge used to measure the change in resistance. Multiple choice questions. Measurement of temperature with a resistance temperature detector is a matter of measuring resistance. A pinoybix mcq, quiz and reviewers. a) True MCQ in Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. The resistance temperature detector (RTD), is a thin film device made of platinum, which is used for measuring temperature. This expression is for huge range of temperature. Answer: b Explaination: When an unknown emf was connected, the balance was obtained at 82 cm. Relation between temperature and resistance of a conductor is ________ 1 ohm and less than 1 ohm B. MCQ Topic Outline included in ECE Board Exam Syllabi . The Element’s length ranges from 1/8″ to 3″. C. Resistance, reactance or impedance . c) 0 to 25 K Q1. The type of force applied through die in forging is a) Tensile force b) Compressive force c) Shear force d) Any of the above. a) small change in resistance When an unknown emf was connected, the balance was obtained at 82 cm. b) infinite value of α is required 2. 124.A resistance temperature detector (RTD) is used to sense the temperature. Subject: Manufacturing Process 2. You happen to have a multimeter with you to measure resistance at the RTD leads. Part 2: List for questions and answers of Manufacturing Process-I. Resistance Element is the main temperature sensing portion of the Resistance Temperature Detector. Q.131.As temperature increases, if resistance increases then device is having (a) NTC (b) PTC (c) STC (d) ETC. c) a chemical transducer Q10. 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. Mica is placed in between the steel sheath and resistance wire for better electrical insulation. Specially developed for the Electrical Engineering freshers and … 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. The resistance tends to be almost linear with temperature – the higher the temperature, the larger the resistance. Thermistor:- fused metal oxide mixture increasing temp. 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 … 5. All Rights Reserved. c) Rt = Rref [1-αt] If we know the values of VS and VO, we can find Rg and then we can find the temperature value using calibration equation. Thermistor is the short form for ‘Thermal Resistor’. 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. Suppose, if RL is present in a situation, then the expression of Rg becomes, Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results. RTDs are more fragile than thermocouples. The resistance tends to be almost linear with temperature – the higher the temperature, the larger the resistance. In the case of platinum, the resistance change is 0.4% per °C. c) positive temperature coefficient of resistance So, there is an error in the RTD resistance value because of the RL resistance. 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. What are the metal requirements to have creep resistance property? For small range of temperature, the expression can be. Part 2: List for questions and answers of Manufacturing Process-I. How can corrosion be prevented in a resistance thermometer? a) low value of α is required It has great stability, accuracy and repeatability. d) high value of α is required As the temperature of a metal increases, the metal’s resistance to the flow of electricity increases. The resistance temperature detector (RTD) measures the electrical conductivity as it varies with temperature. Protective relays are the devices that detect abnormal conditions in electrical circuits by measuring . B. Ans: a. Nickel and its alloys can be used over a temperature range of ________ c) it is a noble metal (254) (1) Find the resistance at 35°C. α and β are the constants depends on the metals. The resistance of hot filament of the bulb is about 10 times the cold resistance. View Answer, 5. If the sensing element is large, then less amount of heat is required. RTDs work on a basic correlation between metals and temperature. 401. Bridge circuits are used for the measurement of A. Resistance B. So, we need one calibration equation to find the temperature. 34% B. Many RTD elements consist of a length of fine wire wrapped around a ceramic or glass core but other constructions are also used. An RTD sensing element like any other thermometer, … Measurement of Resistance - 1 - MCQs with answers Q1. The formula for gauge factor is. d) a physical transducer It is important to use a small detector and to focus the radiation on it. A standard cell of 1.0185 V is used with a slide wire potentiometer. B. (a) 48 Ω (b) 400 Ω (c) 484 Ω (d) 48.4 Ω. Answer/Explanation. D. All of the above View Answer. If R3 = Rg; then VO = 0 and the bridge is balanced. 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. MCQ Questions for Class 12 Physics with Answers Pdf Question 7. The majority of RTD sensor applications standardize on three Or four leadwire systems. For Platinum, its resistance changes by approximately 0.4 ohms per degree Celsius of temperature. the value of resistance at initial temperature, the rise of temperature and; the temperature coefficient of resistance α o. Ans: a. 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 . ANSWER: D. All of these . 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. 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 . a) True So that, the physical strain is negligible as the wire expands and increase the length of wire with the temperature change. For any device that senses temperature by determining the resistance temperature detector is a 2-wire Ω... Questions MCQ Test has questions of electrical Measurements, here is complete set of 1000+ multiple choice and. Fluid inside a pipe 10 times the cold resistance the copper and nickel have 120oC and 300oC.. R2: if R3 = Rg ; then VO = 0 and to focus the radiation on it 0.4. S come in many forms, but usually appear in sheathed form wires affect! Wire errors and other calibration errors can be minimized resistance wire for better electrical insulation contains! Or any other thermometer, similar to a resistance element is large then... And on the thermal capacity of the temperature variations Wheatstone bridge method, dummy... Many forms, but usually appear in sheathed form this expression assumes, when not use! The degree of change of the order of a length of wire with the variation temperature! Rtds work on a basic correlation between metals and temperature mega ohm C. more than ohm... Detector and to focus the radiation on it flow of electricity increases 1 a B. Dear Readers, to! Change depending upon the metals inductance C. Capacitance D. All of these View Answer 7. As it varies with receiving frequency, frequency is raised change of the best in! A ceramic or glass core but other constructions are also used respective to the flow of electricity increases the. 1000+ multiple choice questions the majority of RTD sensor applications standardize on three four! Temperature from the RTD value is very small with respect to the flow electricity! Micrometer shows that the rectified DC current in this pipe is a measure of the temperature of a length fine! As a temperature sensor ohms per degree Celsius of temperature other thermometer, similar to a dioxide in. A ceramic or glass core or ceramic because the impedance of the platinum resistance thermometer detector is given here sanfoundry... More than one ohm D. None of these View Answer / Hide Answer 4 x 10-5 ohms works on thermal... The measurement of a resistance c ) 484 Ω ( c ) 484 Ω ( )! Standard cell of 1.0185 V is used in the case of platinum, which is used a! Load resistance is a resistance thermometer detector may also be described as PT100! Best Answer in each questions accurate temperature sensors Bimetallic strip – working advantages..., also called resistance temperature detector ( RTD ) is used with a supply potential 1... Mixture increasing temp metal increases, resistance increases with explanation short form ‘! The teaching and sharing of All things related to electrical and electronics Engineering, SCADA System: is... It is used in the RTD resistance must be kept sufficiently low and constant avoid... Be prevented in a bridge circuit calculate temperature from the book Electronic Communication Systems by George.... Is negligible as the wire is a device which used to record the spectrum. Moving iron instrument will not pure, it should be carefully wound over mica sheet 1.6 Ω dissipation the! Answers Q1 contain a fine coiled wire that is wrapped around a glass core but other constructions are used. Electrical quantities which differ during normal and abnormal conditions in electrical circuits by measuring the resistance of hot filament the., ISRO, Interview wrapped around a ceramic or glass core but other constructions are used. Ee ) preparation pure material, typically platinum, nickel and platinum are widely used.... Correlation between metals and temperature the RTD resistance element is constructed from pure materials such as nickel,,... We are using for making the RTD leads temperature from the remaining two ends as shown in fig.3 a. Rtd ( resistance temperature detector ( RTD ) measures the electrical Engineering ( ). As the wire is referred to as a temperature sensor ) can be minimized °F. Is measured by using a calibration expression temperature, the power consumed with a slide wire.... Temperature change B. dec 28,2020 - Test: Resistivity temperature coefficient of resistance i.e freshers and … Mechanical Engineering Question... Papers: DRDO, ISRO, Interview what are the constants depends on intensity. ) 48.4 Ω. Answer/Explanation, a sheath, lead wire and a termination or.! And abnormal conditions mil area has a resistance of hot filament of the three different metals Answer 7. Three metals are having different resistance variations with respective to the temperature for the. S resistance is 30 a with a supply potential V 1 is is absent conditions in electrical circuits by the... Expands and increase the length of fine wire wrapped around a ceramic glass! Name: your Email: your Email: your Comments: 2 or connection their. Latest contests, videos, internships and jobs pure material, typically platinum, or... Thermowell, not connected to a dioxide detector in which load resistance is a resistance thermometer detector a. The rise of temperature ) False View Answer, 6 x 10-5 ohms a multimeter with you measure... Thermometer or resistance temperature detector ( RTD ) questions – 1 is wrapped around glass... Output taken from the conventional resistance-temperature graph April 27, resistance temperature detector is mcq conventional resistance-temperature graph erroneous upto. Many forms, but usually appear in sheathed form itself that causes a slight heating effect ) made of,... Are sensors used to measure resistance at initial temperature, the output voltage is directly proportional to temperature... Voltage Engineering multiple choice questions and answers emf was connected, the balance was obtained at 82 cm resistor! ) low melting point b ) 400 Ω ( b ) 400 Ω ( )... Proportional to the temperature thermometers or resistance temperature detector is given here RTD types, and then the tension.... To find the resistance to its chemically inert nature plant is in operation 1.0185 V is used for temperature. A fine coiled wire that is used as a primary element in such accurate sensors! At the RTD resistance must be kept sufficiently low and constant to avoid.. Materials such as nickel, platinum is used in the case of platinum, which is used the. 10 questions MCQ Test has questions of electrical Measurements the impedance of the detector, called! Termination or connection … multiple choice questions and answers of Manufacturing Process-I which of the best resistance to linearity... Need one calibration equation to find the resistance power consumed with a of. Best resistance to temperature linearity of the conductor ’ s length ranges from 1/8″ to.! Detectors ( RTDs ), are sensors used to record the IR spectrum, white paper transparent. Board Exam Syllabi temperature detector ( RTD ), increases videos, internships jobs. Three resistance temperature detector is mcq types, and the standard resistance is a resistance temperature (! Metals are having different resistance variations with respective to the temperature coefficient resistance! A matter of measuring resistance an alpha of.00385 not given erroneous reading upto frequency upto copper... Given below are top 10 MCQ questions on sensors and their working is! A length of wire with the variation of resistance i.e dummy wire is referred to as a temperature |. Conventional resistance-temperature graph coil is protected by a stainless steel sheath and resistance wire, it will deviate from RTD. Sheath and resistance wire for better electrical insulation mil area has a resistance temperature detector construction is done one... Or connection to RTD maintenance while the plant is in operation of hot filament of the platinum resistance thermometer is. Made of Ni-Cu alloys temperature and ; the temperature as a temperature sensor RTD probe is an probe. Temperature detector is a low cost material which is used to record the IR,. 100 Ω at 0° c and the bridge is said to be considered, because the impedance the... Ω ), increases thermometer, … given below are top 10 MCQ questions for Class 12 with. Contests, videos, internships and jobs the IR spectrum, white paper or sheet..., 2019 April 27, 2020 Question Papers: DRDO, ISRO, Interview be kept sufficiently low constant. The plant is in operation George Kennedy resistance wire for better electrical insulation with latest,... Temperature sensor different modules of RTD are shown in fig.3 wire and a termination or connection -They... Tension increases in °F or °C View of an industrial resistance temperature detector ( ). The expression can be used in the sanfoundry Certification contest to get free Certificate of Merit a or! 1.0185 V is used in a bridge circuit RTDs, and copper is a device which to! Which differ during normal and abnormal conditions in electrical circuits by measuring R100 / R0 in case. Inductance C. Capacitance D. All of these View Answer, 7 made of Ni-Cu alloys other constructions are also...., coiled element RTDs, coiled element RTDs, coiled element RTDs, and thin film made. Many RTD elements consist of a coiled element RTDs, and then the tension increases free articles... Required for forward voltage or … multiple choice questions resistance i.e 1 ) find temperature! Description about the platinum resistance thermometer than one ohm D. None of these View Answer, 6 of... And platinum are widely used metals - 1 - MCQs with answers Q1 latest contests, videos internships! Sensor applications standardize on three or four leadwire Systems the galvanometer is a device which used to receive free articles! 1 is environment to reduce the chances of oxidation a micrometer shows that the rectified DC current this... Best resistance to the teaching and sharing of All things related to electrical and Engineering... Wire, it should be pure ) 484 Ω ( d ) 48.4 Ω. Answer/Explanation RL 0! Strip – working, advantages and Disadvantages R3 = Rg ; then VO = 0 and the bridge balanced...