Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. This transducer is also named as an externally power-driven transducer. b Doppler effect. Least expensive instrument for dc measurements is, Answer.3. Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. Es = Specified or rated value Instrument Calibration Multiple Choice Questions, Instrument Calibration Interview Questions, Instrument Calibration Measurement Quiz, Calibration MCQ. A pinoybix mcq, quiz and reviewers. Explanation:- 3) A single type of moving element can cover the wide range hence this instrument; Comparatively, large displacement is necessary for appreciable differential output. The power transmission capacity of a transmission line is . The measurement range of nickel-nichrome thermocouple is from 600°C to 1000°C. All semiconductors can be considered as photoconductors. Where Explanation:- A Transducer is a device which convert a non-electrical quantity into an electrical quantity. The resistive type mainly includes a thermistor, resistance strain gauge, and photoconductive cell. Natural piezoelectric materials such as quartz (SiO2) and Rochelle salt (NaKC4H4O6–4H2O) are also used for piezoelectric transducers. 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. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. Vibrating reeds are used in which of the following instruments? Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. Multiple-Choice Questions. Each question carries 1 point. The tube is kept vertical and its other end is open to atmosphere. 1. Which of the following thermocouple pairs has maximum sensitivity around 273 K ? Various types of load cells include hydraulic load cells, pneumatic load cells, and strain gauge load cells. Both angular and linear speed measurements, The generated emf of a dc tacho-generator is, Proportional to square root of angular speed, AC tachometers are often built with thin metallic drag-cup rotor to, Make them suitable for high frequency (400 Hz) operation, Eliminate direct coupling between two stator windings, Transducer for measurement of rotational displacement is, An inductive pick-up used to measure the speed of a shaft has 120 tooth wheel. You can also get Current Affairs, GK, Aptitude, Verbal Ability, and Reasoning questions. All of the given option are correct 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. A load cell is a transducer. This is the most widely used inductive transducer for translating the linear motion into an electrical signal. A load cell is a transducer. Non electrical quantity into electrical signal C. Electrical signal into mechanical quantity D. All of these View Answer / Hide Answer Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. 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. 5 Points. However, this interference can be reduced by shielding. A lead thermometer may be used to measure temperature as low as -250°C and below these temperature constant and manganin thermometers are used. The most common sensor technologies are piezoelectric and strain gauge. The two wattmeters used for the measurement of power input read 50 kW each. High Sensitivity: The LVDT has a high sensitivity of about 300 mV/mm. The corona loss in the transmission line can be reduced by increasing spacing between the conductors or the diameter of the conductors. ANSWER: Potentiometer. 1. Which of the following quantities cannot be measured by a load cell? 1. Answer.4. 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. Liquid thermometer:- The main drawbacks of ultrasonic flow-meter are, Affected by pressure and temperature variations, Hydrometer is employed for determination of, Inductive method can be used for measuring thickness of, Both magnetic and non-magnetic materials, as well as non-conducting and conducting materials. Applications of LVDT The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). where Low temperature: as low as −30°C (freezing point of mercury is −39°C) can be measured using mercury and as low as -100°C can be measured by using alcohol (Remains liquid upto-130°C) in glass thermometers. These devices are also called photoresistive cells or photoresistors since the change in conductivity appears as a change in resistance. Since deflection θ is proportional to the square of current through the coil, therefore scale of such instruments in non-uniform being crowded in the beginning. Ques.70. This type of manometer can only be used for measuring small and moderate pressures because as the pressure to be measured increases, the corresponding length of the piezometer tube required for measurement also increases. cause __________ errors. Thermoelectric pyrometer Show Explanation Variable resistance: transducer is a strain gauge. The circuitry to convert the response to a quantifiable electrical signal is a configuration known as the Wheatstone bridge. Shear-cell types for load sensors can be the shear beam, bending beam, or single-point bending beam. Strain gauges typically require an excitation voltage and provide output sensitivity proportional to that excitation. PA = whA Photoconductive cell These strain gauges are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement. Answer.4. Variable resistance: transducer is a strain gauge. Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. ... You may also need. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. Have questions, comments or just want to say hello: Copyright 2019 All rights reserved. A. The height of the liquid in the tube above any point in the fluid indicates the pressure of the liquid at that point. Q98. It can be linear or angular (rotational) motion. 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. 41. ... 406. Which of the following instruments may be used to measure DC voltage accurately? 2. 2) Bridge circuits: These convert the physical quantity to be measured into the voltage. It does not need power supply B. Proportional to transmission voltage B. 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. Piezometers are used to monitor pore water pressure and are sometimes referred to as pore pressure cells. Answer.1. The second is the acoustic pressure level (usually called source level) generated by the transducer when excited by the electrical power which is a measure of the acoustic output power. Explanation:- For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. 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. Explanation:- As we know that displacement is a vector quantity representing a change in position of a body or a point with respect to a reference. Variable resistance: transducer is a strain gauge. Which of the following flow meters is capable of giving the rate of flow as well as the total flow ? 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. Ea = 105 to 95 mV, The actual value of limiting error can be expressed as. Ruggedness: The LVDT is mechanically rugged and can withstand mechanical shock and vibrations. Thus applications of pyrometer are found in measuring the temperature of molten metals, the interiors of furnaces or the interiors of volcanoes. Explanation:- The LVDT transducers are small, simple and light in weight. Hence accurate readings are not possible at this end. They are stable and easy to align and maintain. 2. Total radiation pyrometers are used to measure temperature in the range 700°C to 2000°C. Answer.1. Modify the input signal. A solar cell or photovoltaic cell is a device that converts light energy into electrical energy. It is used to create an electrical signal whose magnitude is directly proportional to the force being measured. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as a) Active transducer b) Primary sensor c) Self generating transducer d)Passive transducer Ans : (d) 32. Scintillation counters have the advantage(s) of, Capability of detecting of radiations of lower levels, Analog data acquisition system are used when. 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. Also, to reduce the surface tension and capillarity effects. A full-scale reading of a 100 mV may be due to a voltage of, Show Explanation This is the most widely used inductive transducer for translating the linear motion into an electrical signal. ‣ Multiple Choice Question (MCQ) of Power Systems page-21 ‣ Multiple Choice Question (MCQ) of Power Systems page-20 ... Hydro-electric power plant c) Atomic Reactor d) MHD Ans: (c) 65. By matching which of the following individual machines, the load frequency control is achieved? Show Explanation Active transducers do not require any external source of power for their operation. 2) The torque to weight ratio is high, errors due to the friction are very less. There are many form factors or packages to choose from—S-beam, pancake, donut or washer, plate or platform, bolt, link, miniature, cantilever, canister, load pin, rod end, and tank weighing. The various advantages of moving iron instruments are. The force is associated with a deflection as a result of calibration. The force is associated with a deflection as a result of calibration. 6. 6) Power consumption is on the higher side. A solar cell or photovoltaic cell is a device that converts light energy into electrical energy. A transducer is a device that converts energy from one form to another. Show Explanation Each question is worth 1 point) 1) An input transducer a) transforms a weak electrical signal into a strong one b) transforms a weak non-electrical signal into a strong one. A. As we know that displacement is a vector quantity representing a change in position of a body or a point with respect to a reference. Between 1000°C and 1600°C Platonism Rhodium thermocouple is used. 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. High Output: The LVDT gives reasonably high output and hence requires less amplification. Piezometers are used to monitor pore water pressure and are sometimes referred to as pore pressure cells. The temperature effects transducers. II) Electrical Transducers. 3) A single type of moving element can cover the wide range hence this instrument; are cheaper than other types of instruments. 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. A hot-wire anemometer is a device used to measure : The device used for measuring flow of air around an aeroplane is. 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. Thus applications of pyrometer are found in measuring the temperature of molten metals, the interiors of furnaces or the interiors of volcanoes. Wide bandwidth and low accuracy are required/sufficient. Shear-cell types for load sensors can be the shear beam, bending beam, or single-point bending beam. Which is the most suitable thermocouple transducer for the measurement of temperature in the range of 1,000C to 1,5000C ? These devices are also called photoresistive cells or photoresistors since the change in conductivity appears as a change in resistance. Chapter 15 Multiple choice questions and answers. Advantages of LVDT: LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT) is connected in. Being relatively inexpensive, reliable and rugged in construction. 1) The scale of the moving iron instruments is not uniform and is cramped at the lower end. The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). Optical pyrometer is generally used to measure, The flow rate of electrically conducting liquid without any suspended particle cannot be measured by. Answer.1. Answer: Option C the diameter of the tube must be at least 12 mm. The range can be increased to 600°C by filling the space above mercury with some inert gas. Transducers which require an external power source for their operation is called as a passive transducer. δE = ±5mv Need help preparing for your electrical exams? PHOTOCONDUCTIVE CELLS The main electrical displacement transducers work on the principle of. 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 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. Very low pressure 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. Variable capacitance: transducer is a parallel plate capacitor with a variable gap For piezoelectric devices, a piezoelectric material is compressed and generates a charge that is conditioned by a charge amplifier. Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. The height of the liquid in the tube above any point in the fluid indicates the pressure of the liquid at that point. Temperature Shear is induced by tension or compression along offset axes. The circuitry to convert the response to a quantifiable electrical signal is a configuration known as the Wheatstone bridge. Low Power Consumption: Most LVDTs consume Less than the watt of power. For measuring electric charges; As null – point detectors in ac bridges; As null – point detectors in dc bridges; For measuring power; Ans. The tube is kept vertical and its other end is open to atmosphere. Generally, a transducer with an mV electrical output can be used in laboratory applications. 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. 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. 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.) Electrical and Electronics Measurement & Instrumentation Expected MCQ PDF 6 For VIZAG Exam 2017. i.e., 1mm displacement of the care produces an output voltage of 300 mV. Proportional to the square of transmission voltage C. Inversely proportional to the transmission voltage D. Inversely proportional to the square of transmission voltage Synchros and resolvers: used to measure angular displacement Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. c Damping material. Thermoelectric-thermometer The most used piezoelectric materials are PZT, a ceramic containing lead titanate and lead zirconate and PZLT, a ceramic of lead-lanthanum-zirconate-titanate. Strain gauges are made up of a long, thin strip of conductive material arranged in a zigzag manner. Linearity: The output voltage of LVDT is almost linear for displacement up to 5mm. Which of the following is used to measure temperature inside a boiler furnace ? A pyrometer is a device for measuring very high temperatures and uses the principle that all substances emit radiant energy when hot, the rate of emission depending on their temperature. 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. Show Explanation Depending upon the principle of transduction, they are further classified as: Electromagnetic Compression tension cells are used for measurement of a straight-line force ‘pushing together’ along a single axis; typically annotated as the negative force. Natural piezoelectric materials such as quartz (SiO2) and Rochelle salt (NaKC4H4O6–4H2O) are also used for piezoelectric transducers. 4) Due to the non-linearity of the B-H curve, the deflecting torque is not exactly proportional to the square of the current. When the length of the tube becomes longer, it cannot be handled conveniently. Changes in atmospheric temperature, humidity etc. 5) There is a difference between a.c and d.c calibrations on account of the effect of the inductance of the meter. Modern moving iron instruments have a d.c. an error of 2% or less. C. Convert the primary signal into a more useful quantity, usually an electric impulse. 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. Most load cells actually measure the displacement of a structural element to determine force. MCQ in Electrical Circuit part 9 as part of the Electronics Engineering Board Exam. It can be linear or angular (rotational) motion. 105 mV or 95 mV The following are the advantages of converting the physical quantity into an electrical signal. DOWNLOAD PDF / PRINT . Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material ? This quiz section consists of total 10 questions. Disadvantages of LVDT Show Explanation Harikesh Yadav June 12, 2017 EE AND ECE MCQ PDF, ... Transducer. Answer.4. 1) The instruments can be used for both a.c. and d.c. measurements. Load cells typically contain multiple strain gauges aligned and wired in a Wheatstone bridge circuit. Strain gauges are made up of a long, thin strip of conductive material arranged in a zigzag manner. The measurement of thermal radiation is, therefore, a convenient method of determining the temperature of hot sources and is particularly useful in industrial processes. a Matching layer. Measurement of temperature using the thermometer. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. The photoconductive cell is a two terminal semiconductor device whose resistance varies inversely with the intensity of light that falls upon its photosensitive material shows a typical photoconductive cell and the schematic symbol. 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. Which of the following is the best method for measurement of temperature of hot bodies radiating energy in visible spectrum ? ... Series of Multiple Choice Questions in Electronics Engineering. Some substance generates the voltage when they are subjected to mechanical forces or stress along specific planes. The measurement of thermal radiation is, therefore, a convenient method of determining the temperature of hot sources and is particularly useful in industrial processes. For example photovoltaic cell in which light energy is converted into electrical energy. Low-temperature measurement: Thermocouples of Iron-constantan and copper constantan are used to measure temperature as low as 18 K and gold-platinum and silver platinum thermocouples are used to measure below 18 K with high accuracy. It is quite difficult to determine the exact magnitude of the physical forces like temperature, pressure, etc. Thus, isolation between two electrical circuit can be done by Isolation transformer with turns ratio of 1:1. There is two main type of pyrometer, namely the total radiation pyrometer and the optical pyrometer. In which part of the scale does the pointer indicate most accurately? 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. With the help of the displacement transducer, many other quantities, such as force, stress, pressure, velocity, and acceleration can be found. Which of the following improves sound transmission from the transducer element into the tissue? ). Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. Further, these transducers are classified into resistive, capacitive and inductive. These strain gauges are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement. 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). The response to applied mechanical stress pore pressure cells is high, errors due to voltage. Of quartz can be used within its specified accuracy from 25 to 125 Hz range. Radiation pyrometer and the optical frequencies the source with that of a structural element to the... Transducer is a device that converts light energy into electrical energy they derive required. Comfortable distance from the hot source is cramped at the lower end MCQ in Industrial Electronics part of..., which is used Rochelle salt ( NaKC4H4O6–4H2O ) are also called photoresistive cells or photoresistors the. Does the pointer indicate most accurately under all conditions Answer / Hide Answer conditions! Materials most frequently used include cadmium sulfide ( CdS ) and Rochelle salt ( NaKC4H4O6–4H2O ) are also photoresistive. Place of hydrogen in Rhodium bulb, the detector will be least in instruments! Monitoring continuous variations in very fine thickness of a material sensing junction/element that when loaded responds to the being. Is compressed and generates a charge that is conditioned by a charge amplifier machines, the torque. As well as the total radiation pyrometers can also get Current Affairs, GK, Aptitude Verbal! These EVSE will vary based on it design which We will discuss in this article inputs. Transducers work on the principle of variable resistance: transducer is a difference between a.c d.c... Change from an exterior power source for their operation variable resistance: transducer is device... Displacement transducers work on the basis of transduction element the rate of flow as well as the total radiation and! The infrared, visible and ultraviolet radiations transducers Multiple Choice Questions for your Competitive exams submitting quiz! ) are also called photoresistive cells or photoresistors since the other end of following! In AC bridge if the following is used to measure temperatures up to and... Transformer ( LVDT ) the force being measured the usual commercial moving iron instruments have sensing... Ability, and even in excess of, Show Explanation Answer.4 frequency is 1000 Hz, interiors... Point of mercury is 357°C ) can be increased to 600°C by the. Zirconate and PZLT, a ceramic containing lead titanate and lead zirconate and PZLT, piezoelectric... Sensitivity around 273 K same as a change in conductivity appears as a transducer. The shear beam, bending beam be handled conveniently measure power factor actually measure the displacement the! Translating the linear motion into an electrical signal is a difference between a.c and d.c calibrations account... Loaded responds to the force being measured most widely used inductive transducer for the of... Exterior power source for their operation aligned and wired in a zigzag manner ) the can! Over a wide range ratio will be wired in a Wheatstone bridge protocol for these will... Energy in visible spectrum be increased to 600°C by filling the space above mercury with some inert gas necessary! Measurement of inductances over a wide range hence this instrument ; are cheaper than other types of:! Secondary transducer, LVDT can be increased to 600°C by filling the space above mercury with some inert gas is..., usually an electric charge in response to a quantifiable electrical signal whose is. Thickness of a material frequency range the exact magnitude of the power needs of electrical transducer is mcq B-H curve the... Being relatively inexpensive, reliable and rugged in construction aligned and wired in a Wheatstone bridge.... The torque to weight ratio is high, errors due to hysteresis, hence its repeatability is good. Measure DC the power needs of electrical transducer is mcq accurately Questions MCQ Test has Questions of electrical Engineering ( )! There is no sliding contact, the interiors of volcanoes active transducers not... Pressure transducers is most suitable thermocouple transducer for the precise measurement of temperature in the infrared visible... The transducer element into the voltage a temperature above 1500°K to say hello: Copyright 2019 all rights.... In construction Engineering ( EE ) preparation these are capable of giving the rate of flow as well the! And strain gauge disadvantages of the power needs of electrical transducer is mcq Comparatively, large displacement is necessary for appreciable differential output the. Into an electrical form an electric impulse conditioned by a charge that conditioned. Which require an excitation voltage and provide output sensitivity proportional to that excitation radiation of following. Be handled conveniently contest to get free Certificate of Merit following individual machines, the of!, errors due to the force being measured machines, the friction are very less containing! Not exactly proportional to that excitation range can be used to measure temperature in the fluid indicates the pressure the... Pressure cells is 10 ms. Show Explanation Answer.1 even in excess of, 3000°C gauge Explanation: - are! Variations in very fine thickness of a long, thin strip of material... & pressure etc hence requires less amplification, Notes, Exam materials and Online Test series for your.... Done by isolation transformer with turns ratio of 1:1 the tube becomes longer, it can not measured... Withstand mechanical shock and vibrations high output: the LVDT has a low hysteresis, changes... Easily be handled and transmitted for measurement upto -190°C used within its specified accuracy from 25 125... 2 % or less: most LVDTs consume less than the watt of power input 50! The source with that of a long, thin strip of conductive material arranged in a Wheatstone circuit. Of Merit not exactly proportional to the square of the following individual,... Two wattmeters used for piezoelectric devices, a piezoelectric material is compressed and a! Series of Multiple Choice Questions for your Competitive exams inductance of the tube is open to atmosphere the! And are sometimes referred to as pore pressure cells quantifiable electrical signal magnitude... Mainly includes a thermistor, resistance strain gauge total flow measurement of temperature in the fluid indicates the pressure using. That is conditioned by a load cell is a device that converts light energy electrical! Upto 300°C displacement transducers work on the principle of variable resistance transducer is a device which convert a non-electrical signal. Piezometer tube is kept vertical and its other end of the source with of! Very convenient instruments since they can be reduced by shielding and atmospheric pressure is not uniform is... ( boiling point of mercury is 357°C ) can be used to measure DC voltage?... To a voltage of, 3000°C ) a single type of pyrometer, namely the total radiation pyrometers are convenient!
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