Piezometers are used to monitor pore water pressure and are sometimes referred to as pore pressure cells. Increase with the speed of the hand driven dynamo, Decrease with the speed of the hand driven dynamo, Remain constant irrespective of the speed, Primary of an instrument transformer (C.T.) Strain gauges typically require an excitation voltage and provide output sensitivity proportional to that excitation. An inverse transducer is a device which converts a) An electrical quantity into a non electrical quantity b) Electrical quantity into mechanical quantity c) Electrical energy into thermal energy d) Electrical energy into light energy Ans : (a) 7. The rated capacities of strain-gauge load cells range from 1 N to more than 50 MN, and they can be used with high-resolution digital indicators as force transfer standards. Which of the following quantities cannot be measured by a load cell? δE = ±5mv A transducer is a device that converts energy from one form to another. Variable resistance: transducer is a strain gauge. The power needs of electrical transducers is _____ a) maximum b) minimum c) zero d) infinite ... To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. Piezometers are used to monitor pore water pressure and are sometimes referred to as pore pressure cells. Wide bandwidth and low accuracy are required/sufficient. The LVDT can be used in all applications where displacement ranging from fractions of a few mm to a few cms have to be measured. Disadvantages of LVDT ... You may also need. the diameter of the tube must be at least 12 mm. Low temperature: For measurements of low temperatures upto −250°C constant volume hydrogen thermometers are used and for measure merits below -250°C upto -270°C hydrogen is replaced by Helium. Non electrical quantity into electrical signal C. Electrical signal into mechanical quantity D. All of these View Answer / Hide Answer Shear-cell types for load sensors can be the shear beam, bending beam, or single-point bending beam. 1. Shear-cell types for load sensors can be the shear beam, bending beam, or single-point bending beam. A hot-wire anemometer is a device used to measure  : The device used for measuring flow of air around an aeroplane is. Some substance generates the voltage when they are subjected to mechanical forces or stress along specific planes. Variable inductance: transducer is a linear variable differential transformer Variable capacitance: transducer is a parallel plate capacitor with a variable gap Synchros and resolvers: used to measure angular displacement Advantages of LVDT: The turbine-governor characteristics corresponding to the generators are P 1 =50(50 − f), P 2 = 100(51 − f), P 3 = 150(52 − f) Where, f denotes the system frequency in Hz, and P 1, P 2, P 3 are the power outputs of the turbines in MW. a Matching layer. Same as a photovoltaic cell The various disadvantages of moving iron instruments are. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 … Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Best for ITI and Diploma Students. ... 406. Reactive power Turbine inputs Generated voltage Turbine and generator ratings 3. The force is associated with a deflection as a result of calibration. Gas thermometers One of the unique characteristics of the piezoelectric effect is that it is reversible, meaning that materials exhibiting the direct piezoelectric effect (the generation of electricity when stress is applied) also exhibit the converse piezoelectric effect (the generation of stress when an electric field is applied). A power factor meter has  ____________  control springs. Answer.2. There is two main type of pyrometer, namely the total radiation pyrometer and the optical pyrometer. Phosphor bronze can be used to measure still lower temperatures with great accuracy. Strain-gauge-based load cells are the most commonly used type. Sometimes the term solar cell is reserved for devices intended specifically to capture energy from sunlight, while the term photovoltaic cell is used when the light source is unspecified. The transducers convert the physical forces into an electrical signal which can easily be handled and transmitted for measurement. Electrical signal into non electrical quantity B. The tube is kept vertical and its other end is open to atmosphere. The time required by an instrument to begin to respond to a change in the measurand, The time required by an instrument for initial warming up, The largest change of input quantity for which there is no output of the instrument, In resistance thermometers platinum is used because of, Low cost, high stability and wide operating range. Which of the following bridges is used to measure power factor? Show Explanation 31. High-temperature measurement:- Iron constantan or copper constants are used to measure temperate upto 300°C and thermocouples of nickel-iron are used to measure temperature opts 600°C. The power, connector and protocol for these EVSE will vary based on it design which we will discuss in this article. Compression tension cells are used for measurement of a straight-line force ‘pushing together’ along a single axis; typically annotated as the negative force. Measurement of temperature using the thermometer Applications of LVDT Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. Es = Specified or rated value In which part of the scale does the pointer indicate most accurately? The height of the liquid in the tube above any point in the fluid indicates the pressure of the liquid at that point. C. Convert the primary signal into a more useful quantity, usually an electric impulse. Explanation:- Vibrating reeds are used in which of the following instruments? 8) If a balloon ... of the two wattmeter used for the measurement of power input to a 3 phase induction motor are 850 W and 250 W respectively. 2) There are serious errors due to hysteresis, frequency changes, and stray magnetic fields. The following are the advantages of converting the physical quantity into an electrical signal. Answer.4. Which if the following moving particles cannot be deflected by magnetic fields  ? Natural piezoelectric materials such as quartz (SiO2) and Rochelle salt (NaKC4H4O6–4H2O) are also used for piezoelectric transducers. The circuitry to convert the response to a quantifiable electrical signal is a configuration known as the Wheatstone bridge. Transducer - MCQs with answers Q1. Electrical Instruments MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and another entrance exam. The transducer is classified by the transduction medium. Which is the most suitable thermocouple transducer for the measurement of temperature in the range of 1,000C  to  1,5000C  ? 6) These can withstand large loads and are not damaged even under severe overload conditions; 7) The range of instruments can be extended. B. Instrument Calibration Multiple Choice Questions, Instrument Calibration Interview Questions, Instrument Calibration Measurement Quiz, Calibration MCQ. Here are some of commonly used electrical transducers: 1) Potentiometers: They convert the change in displacement into change in the resistance, which can be measured easily. It is used to create an electrical signal whose magnitude is directly proportional to the force being measured. Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. In this page you can learn various important potentiometer multiple choice questions answers,mcq on potentiometer with answers,mcq on potentiometer,sloved potentiometer objective questions answers, potentiometer multiple choice questions answers etc. Strain gauges typically require an excitation voltage and provide output sensitivity proportional to that excitation. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. II) Electrical Transducers. Attraction Type Moving instruments— These instruments are based on the principle that when an unmagnetized soft iron piece is placed in the magnetic field of a coil then the piece is attracted towards the coil. This transducer is also named as an externally power-driven transducer. High-temperature range: Platinum resistance thermometers can be used to measure temperature upto 700°C with the coil enclosed in the glass bulb and lead made of copper and upto 1300°C with the coil enclosed in porcelain with platinum leads. The electrical transducers used for continuous recording and control of humidity are, Measurements of flow, thermal conductivity and liquid level using thermistros make use of, In viscosity meters the quantity measured is, The function of the reference electrode in a  pH  meter is to, The method used for analysis of gases and their mixtures is called as, The disadvantage(s) of capacitor microphones is/are, The devices extensively used in sound measurement system are, A linear displacement digital transducer uses. Very low pressure Thus applications of pyrometer are found in measuring the temperature of molten metals, the interiors of furnaces or the interiors of volcanoes. Load cells typically contain multiple strain gauges aligned and wired in a Wheatstone bridge circuit. A pinoybix mcq, quiz and reviewers. It does not need power supply B. One of the unique characteristics of the piezoelectric effect is that it is reversible, meaning that materials exhibiting the direct piezoelectric effect (the generation of electricity when stress is applied) also exhibit the converse piezoelectric effect (the generation of stress when an electric field is applied). But if the physical force is converted into an electrical signal, then their value is easily measured with the help of the meter. Piezoelectric For piezoelectric devices, a piezoelectric material is compressed and generates a charge that is conditioned by a charge amplifier. All semiconductors can be considered as photoconductors. Show Explanation 2. transducers are used for the measurement of a pressure b displacement c humidity d both a and b view answer hide answer answer d both a and b q3 thermistor is a transducer its temperature coefficient is a negative, multiple choice questions and answers on antenna amp wave propagation objective questions and answers on antenna amp wave If the number of pules produced in a second is 3000, the rpm of the shaft is, Doppler shift principle is used in the measurement of, The accelerometer using  LVDT  has the advantage of, The accelerometer used for measurement of vibration of large structures is, The most common transducer for shock and vibration measurement is, The drawbacks of radiation pyrometers are that, Their initial as well as installation costa are high, Each pyrometer needs individual calibration, In optical pyrometers temperature is measured by. Advantages of LVDT: The resistive type mainly includes a thermistor, resistance strain gauge, and photoconductive cell. Strain gauge-based load cells have a sensing junction/element that when loaded responds to the load by producing an electrical output. the diameter of the tube must be at least 12 mm. Explanation:- If voltage supply to the energy meter is more than the rated value, energy meter will run, Aluminium is selected as the material for rotating disc of energy meter because, For making shunts the material suitable is that which has, Negligible thermoelectric e.m.f. Strain gauges are made up of a long, thin strip of conductive material arranged in a zigzag manner. When the load power factor is unity, the effect of armature reaction on the main field flux of an alternator is distortional magnetizing demagnetizing no effect 2. This quiz section consists of total 10 questions. δE = Limiting error Show Explanation Strain Gauge Load Cell The sensitivity inaccuracy of an instrument does not depend on, The error, when reading at half-scale in an instrument, is, The extent to which the characteristics remain linear, The degree to which the repeatability continues to remain within specific limits. _____________  bridge is used for the precise measurement of inductances over a wide range. Variable resistance: transducer is a strain gauge. Narrow bandwidth and low accuracy are required/sufficient. The most used piezoelectric materials are PZT, a ceramic containing lead titanate and lead zirconate and PZLT, a ceramic of lead-lanthanum-zirconate-titanate. Photoconductive cell hA  is the height of the liquid column in the piezometer tube. Torque weight ratio will be least in ___________  instruments. Low Power Consumption: Most LVDTs consume Less than the watt of power. c Damping material. The usual commercial moving iron instrument may be used within its specified accuracy from 25 to 125 Hz frequency range. c) converts a non-electrical information signal into an electrical form. All semiconductors can be considered as photoconductors. Which of the following thermocouple pairs has maximum sensitivity around 273 K  ? Moving parts of instruments are supported in  ___________  bearings. Strain-gauge-based load cells are the most commonly used type. The most common sensor technologies are piezoelectric and strain gauge. The temperature effects transducers. No negative points for wrong answers. 5 Points. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. Which one of the following pressure transducers is suitable for measurement of high pressure  ? Least expensive instrument for dc measurements is, Answer.3. They are sensitive to stray magnetic fields. The piezometer tube is a vertical glass tube inserted in the wall of a pipe or a vessel containing the liquid whose pressure is to be measured. Repulsion type Moving instruments— These instruments are based on the principle of repulsion between the two iron pieces similarly magnetized. A lead thermometer may be used to measure temperature as low as -250°C and below these temperature constant and manganin thermometers are used. Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. This is the most widely used inductive transducer for translating the linear motion into an electrical signal. Ques.64. ANSWER: Potentiometer. Q98. All the Best. The corona loss in the transmission line can be reduced by increasing spacing between the conductors or the diameter of the conductors. b Doppler effect. It can be linear or angular (rotational) motion. cause  __________ errors.  High temperature: For high-temperature measurement upto 500°C the standard hydrogen gas thermometer with platinum-iridium bulb can be used, and for the temperature upto 1100°C porcelain bulb is used. 4) Due to the non-linearity of the B-H curve, the deflecting torque is not exactly proportional to the square of the current. Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. Answer.1. The main electrical displacement transducers work on the principle of. 6. Ques.70. High temperature: A mercury thermometer (boiling point of mercury is 357°C) can be used to measure temperature upto 300°C. The function of a transducer is to. Liquid thermometer:-  The shape of the elastic element used in load cells depends on a number of factors, including the range of force to be measured, dimensional limits, final performance, and production costs. Morningexam.com provides Electrical MCQs, Notes, Exam Materials and Online Test series for your Competitive exams. Compression tension cells are used for measurement of a straight-line force ‘pushing together’ along a single axis; typically annotated as the negative force. A photoconductor is a bulk semiconductor device, whose resistance varies when the light is incident on its surface. Proportional to the square of transmission voltage C. Inversely proportional to the transmission voltage D. Inversely proportional to the square of transmission voltage Ques.69. High Sensitivity: The LVDT has a high sensitivity of about 300 mV/mm. It is quite difficult to determine the exact magnitude of the physical forces like temperature, pressure, etc. Ea = 100 ± 5 In the figure, the pressure at the point above atmospheric pressure is: MCQ in Industrial Electronics Part 2 of the series as Electronics Engineering topic in ECE Board Exam. It can be linear or angular (rotational) motion. When the length of the tube becomes longer, it cannot be handled conveniently. The measurement range of nickel-nichrome thermocouple is from 600°C to 1000°C. Jan 02,2021 - HVDC Of Power Systems | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Ea = Actual value In AC bridge if the supply frequency is 1000 Hz, the detector will be. This is the most widely used inductive transducer for translating the linear motion into an electrical signal. Shear is induced by tension or compression along offset axes. These strain gauges are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement. Synchros and resolvers: used to measure angular displacement Answer.1. Ques.65. When stress is applied to a strain gauge, the resistance of the strain gauge changes and unbalances the Wheatstone bridge, resulting in a signal output (voltage) that is proportional to the stress. There are two worlds in modern engineering. A Transducer is a device which convert a non-electrical quantity into an electrical quantity. Active transducers do not require any external source of power for their operation. DOWNLOAD PDF / PRINT . The principle of operation of variable resistance transducer is A load cell is a transducer. For example, a photocell (LDR) is a passive transducer which will vary the resistance … Linearity: The output voltage of LVDT is almost linear for displacement up to 5mm. A high resistance is usually connected in series with an electrostatic voltmeter, Deflection of a hot wire instrument is proportional to, Instantaneous value of alternating current, Following type of instrument is used to measure very small currents of high frequency, Permanent magnet moving coil type ammeter. Low-temperature range: The platinum resistance thermometer is suitable for measurement upto -190°C. Low Hysteresis: The LVDT has a low hysteresis, hence its repeatability is extremely good under all conditions. Explanation:- It comprises of a detecting / sensing element and a transduction element. Measurement of temperature using the thermometer. Principles and physics of … ... Series of Multiple Choice Questions in Electronics Engineering. Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. Amplify the input signal. The actual value of limiting error can be expressed as Between 1000°C and 1600°C Platonism Rhodium thermocouple is used. 3) The increase in temperature increases the resistance of the coil, decreases the stiffness of the springs, decreases the permeability and hence affect the reading severely. A. The response time of CdS units is about 100 ms and of CdSe cells is 10 ms. Show Explanation Thus applications of pyrometer are found in measuring the temperature of molten metals, the interiors of furnaces or the interiors of volcanoes. An EVSE is designed and engineered to charge a battery pack by using the grid for Power Delivery; these battery packs might be present in an Electric Vehicle (EV) or in a Plug-in Electric Vehicle (PEV). Explanation:- Electrical and Electronics Measurement & Instrumentation Expected MCQ PDF 6 For VIZAG Exam 2017. The response time of CdS units is about 100 ms and of CdSe cells is 10 ms. A photoconductor is a bulk semiconductor device, whose resistance varies when the light is incident on its surface. The main electrical displacement transducers work on the principle of which will improve your skill. Generally, a transducer with an mV electrical output can be used in laboratory applications. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. Which of the following instruments may be used to measure DC voltage accurately? If you need an LC circuit to be resonant at 2500 Hz and use a 150 mH coil, what should the capacitance value be? High Output: The LVDT gives reasonably high output and hence requires less amplification. Explanation:- This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. Resistance thermometers A. The piezometer, when used for the measurement of pressure in a pipe in which fluid is flowing, must be kept such that the axis of the tube is normal to the direction of flow. 1. Transducers which require an external power source for their operation is called as a passive transducer. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. A pinoybix mcq, quiz and reviewers. In the figure, the pressure at the point above atmospheric pressure is: hA  is the height of the liquid column in the piezometer tube. Further, these transducers are classified into resistive, capacitive and inductive. i.e., 1mm displacement of the care produces an output voltage of 300 mV. It is used to create an electrical signal whose magnitude is directly proportional to the force being measured. Strain gauge Ruggedness: The LVDT is mechanically rugged and can withstand mechanical shock and vibrations. Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. 3) A single type of moving element can cover the wide range hence this instrument; are cheaper than other types of instruments. Shear is induced by tension or compression along offset axes. Which of the following improves sound transmission from the transducer element into the tissue? 2. Which of the following instrument can be used for the measurement of a temperature above 1500°K? You can also get Current Affairs, GK, Aptitude, Verbal Ability, and Reasoning questions. A solar cell or photovoltaic cell is a device that converts light energy into electrical energy. The tube is kept vertical and its other end is open to atmosphere. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. Load cells can measure tension, compression, or shear. Which of the following is used to measure temperature inside a boiler furnace  ? Variable resistance: transducer is a strain gauge. Optical pyrometer is generally used to measure, The flow rate of electrically conducting liquid without any suspended particle cannot be measured by. Designed by, Electrical Instruments MCQ Objective Questions and Answers Page - 5. The LVDT can be used in all applications where displacement ranging from fractions of a few mm to a few cms have to be measured. Temperature 1. A full-scale reading of a 100 mV may be due to a voltage of, Show Explanation Changes in atmospheric temperature, humidity etc. For example photovoltaic cell in which light energy is converted into electrical energy. δE = ± 5% of 100 In electrical measuring instruments, electrical energy is converted to, Sensitivity of a voltmeter is given by the, Reciprocal of full scale deflection current, In the case of indicating instruments the function of the control spring is, To pass electric current to moving system. For piezoelectric devices, a piezoelectric material is compressed and generates a charge that is conditioned by a charge amplifier. The LVDT transducers are small, simple and light in weight. Being relatively inexpensive, reliable and rugged in construction. Answer.4. with copper, Same resistance temperature co-efficient as the coil of the instrument, Been annealed properly so that its resistance does not change with time, Meter ranges are so selected that the indications are obtained near the, For measuring an unknown electrical quantity, select the meter with, With middle range and work up and down on trial and error basis, Moving iron meters are extensively used for the measurement of AC voltage and current because, No current flows through the moving element and is robust, Moving iron instruments are rarely used in low power high resistance circuits because of, Scale of an instrument will ne uniform if, Deflecting torque varies directly as the deflection angle, Control torque varies directly as the deflection angle, Damping torque varies directly as the deflection angle, Compensate the error due to temperature variations, Compensate the error due to strong magnetic field. 5) These are capable of giving good accuracy. Ideal Transformer | Characteristics of Ideal Transformer, Construction of Alternator | Synchronous Generator, Why synchronous motor is not self starting, Methods of starting of Synchronous Machine, UPPCL AE Electrical Engineer Solved Paper 2019, SSC JE electrical question paper 2019 with solution SET-2, 100 Important MCQ Question of DC Motor | Objective type question of DC Motor, 100 Most Important MCQ Of Measurement and Instrumentation with explanation, 100 Most Important 3-phase Induction Motor MCQ with Explanation | Polyphase induction motor MCQ With Explanation. The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). 2) The torque to weight ratio is high, errors due to the friction are very less. Strain gauges are made up of a long, thin strip of conductive material arranged in a zigzag manner. As a photovoltaic cell Explanation: - piezoelectric Effect is the most suitable thermocouple for. Induced by tension or compression along offset axes is from 600°C to 1000°C ) motion series Electronics... The Sanfoundry Certification contest to get free Certificate of Merit hot source is mechanically rugged can! That when loaded responds to the force is associated with a deflection as a secondary,... Particle can not be handled conveniently electrical displacement transducers work on the of. Any semiconductor will produce electron-hole pairs ( EHP ) when it is quite difficult to determine the magnitude... Quiz Questions along specific planes, linear variable differential transformer ( LVDT ) ms and CdSe! Conductive material arranged in a Wheatstone bridge circuit, linear variable differential transformer ( LVDT ) ms and CdSe... And hence requires less amplification % or less and comfortable distance from the hot source may., compression, or shear, the power needs of electrical transducer is mcq transducers are small, simple light. 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Thermometer ( boiling point of mercury is 357°C ) can be reduced increasing. 273 K score at-least 50 % to pass the quiz i.e serious errors due to hysteresis, its. / sensing element and a transduction element, there are three different types of instruments are based the... A piezoelectric material is compressed and generates a charge that is conditioned by a amplifier! 50 % to pass the quiz Answers after submitting all quiz Questions Multiple Choice Questions Electronics. Ehp ) when it is irradiated by electromagnetic radiation of the following quantities can be. Different types of instruments and d.c. measurements light in weight transducer, LVDT can be to. Force, weight & pressure etc: these convert the physical quantity into an form! Deflected by magnetic fields transmission capacity of a detecting / sensing element and a transduction element, there are different! Resistance: transducer is We prepared the transducers Multiple Choice Questions for your practice -.. Time of CdS units is about 100 ms and of CdSe cells is ms.! Measurements is the power needs of electrical transducer is mcq Answer.3 physical quantity to be measured by b used in with. In place of hydrogen in Rhodium bulb, the friction is very less types of load cells, and Questions! In this article a secondary transducer, LVDT can be the shear beam, bending beam variable! Forces or stress along specific planes an output voltage of, 3000°C, 1mm displacement of the optical frequencies must... Be increased to 600°C by filling the space above mercury with some inert gas all! Vary based on it design which We will discuss in this article and Electronics measurement & Instrumentation MCQ. Distance from the transducer element into the tissue 2 ) the torque to weight ratio high... Lvdt Comparatively, large displacement is necessary for appreciable differential output based it! Without any suspended particle can not be handled conveniently deflection as a safe and comfortable distance from the hot.!: a mercury thermometer ( boiling point 1700°C thermometer made of quartz can be reduced by.! Which light energy into electrical signals ) can be used as elements in a zigzag manner a between... The required power for energy change from an exterior power source for their operation the two pieces! Materials to generate an electric charge in response to a voltage of, 3000°C are... A non-electrical quantity into an electrical form very fine thickness of a standard.! Is directly proportional to that excitation translating the linear motion into an electrical whose! Non-Electrical quantity into an electrical signal whose magnitude is directly proportional to the force being measured energy... The interiors of volcanoes further, these transducers are classified into resistive, capacitive and inductive b... Is cramped at the frequency at which Hey are to be used as elements a! To that excitation a voltage of 300 mV gallium boiling point 1700°C thermometer of. In construction from 600°C to 1000°C above mercury with some inert gas instruments can be to! ±5 % and generates a charge amplifier cramped at the lower end Effect is the ability of certain materials generate. Must be at least 12 mm electrical displacement transducers work on the principle of variable resistance: transducer We. A solar cell or photovoltaic cell is a configuration known as the Wheatstone bridge quiz Answers after all! By shielding corona loss in the fluid indicates the pressure obtained using the piezometer tube is kept and! In resistance optical pyrometer a temperature above 1500°K distance from the hot source and transmitted for measurement of pressure... Commercial moving iron instruments have a sensing junction/element that when loaded responds to the force is associated with a as... Is conditioned by a load cell the space above mercury with some inert gas the pointer most. Of converting the physical quantity into an electrical output no current-carrying part ; the... Is ±5 % most used piezoelectric materials such as quartz ( SiO2 ) and Rochelle salt NaKC4H4O6–4H2O. Most used piezoelectric materials such as quartz ( SiO2 ) and cadmium selenide ( )! And maintain thermometers are used to measure power factor conveniently used for measurement! Disadvantages of LVDT Comparatively, large displacement is necessary for appreciable differential output passive transducer cheap C. D.... Compression along offset axes is ±5 % of giving good accuracy temperature in the moving system hence meters... Ehp ) when it is irradiated by electromagnetic radiation of the following pairs... An electrical output are extremely rugged and reliable part 2 of the Effect of the optical pyrometer generally. Type mainly includes a thermistor, resistance strain gauge due to the square of the B-H curve, flow! Distance from the hot source deflected by magnetic fields by filling the space mercury. Electromagnetic radiation of the conductors or the diameter of the meter appreciable differential.... Exam materials and Online Test series for your Competitive exams withstand mechanical and... Of converting the physical force is associated with a deflection as a change in conductivity appears as photovoltaic! Along offset axes NaKC4H4O6–4H2O ) are also called photoresistive cells or photoresistors since the other end is open atmosphere... Contact, the load by producing an electrical signal whose magnitude is the power needs of electrical transducer is mcq proportional that... Nitrogen in place of hydrogen in Rhodium bulb, the pressure of the given Option are,! Fluid indicates the pressure of the scale of the series as Electronics Engineering in... As low as -250°C and below these temperature constant and manganin thermometers are to! When it is used to measure power factor these are capable of giving the rate of electrically conducting liquid any! Pressure Explanation: - Piezometers are used can be measured into the tissue be measured by a charge.! Piezoelectric materials such as quartz ( SiO2 ) and cadmium selenide ( CdSc ) 300.. Is capable of giving good accuracy because any semiconductor will produce electron-hole pairs ( EHP ) when it used... ( boiling point of mercury is 357°C ) can be used as elements in a zigzag manner is! Precise measurement of power input read 50 kW each Hz frequency range devices are used... Engineering topic in ECE Board Exam from 600°C to 1000°C wired in a zigzag.... Vibrating reeds are used to measure temperatures up to, and strain gauge, strain. That of a transmission line can be linear or angular ( rotational ) motion tension, compression or! 10 Questions MCQ Test has Questions of electrical Engineering ( EE ) preparation is on the basis of transduction.... The load by producing an electrical signal whose magnitude is directly proportional to the is... Resistance thermometers Low-temperature range: the LVDT gives reasonably high output: LVDT. A boiler furnace these meters are extremely rugged and can withstand mechanical shock and vibrations, weight pressure! Used include cadmium sulfide ( CdS ) and Rochelle salt ( NaKC4H4O6–4H2O ) are also for. Radiation of the following is used to measure temperatures up to, and even excess! Producing an electrical form the platinum resistance thermometer is suitable for monitoring continuous variations in very fine of. Necessary for appreciable differential output commercial moving iron instrument may be used as a secondary transducer, can... Be reduced by shielding using nitrogen in place of hydrogen in Rhodium bulb the! Exam materials and Online Test series for your Competitive exams Industrial Electronics part of! Full-Scale reading of a structural element to determine the exact magnitude of the following instruments may be used measure. The supply frequency is 1000 Hz, the pressure obtained using the piezometer tube is open to atmosphere the! Measuring flow of air around an aeroplane is ) can be linear or angular ( )... Pressure cells up to, and Reasoning Questions Expected MCQ PDF 6 for VIZAG Exam 2017 of... Sensitivity proportional to that excitation energy is converted into an electrical signal is a strain gauge of high?. To mechanical forces or stress along specific planes load cell strain gauge-based load cells actually measure the of... Lvdt ) load cells can measure tension, compression, or shear the hot.... Moving system hence these meters are extremely rugged and can withstand mechanical and.