A load cell is a transducer. 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. 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. Which of the following is used to measure temperature inside a boiler furnace  ? Which of the following thermocouple pairs has maximum sensitivity around 273 K  ? Such substance is known as. A gallium boiling point 1700°C thermometer made of quartz can be conveniently used for measurement of temperature upto 1000°C. The Helium. 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. Harikesh Yadav June 12, 2017 EE AND ECE MCQ PDF, ... Transducer. Piezometers are used to monitor pore water pressure and are sometimes referred to as pore pressure cells. Shear is induced by tension or compression along offset axes. Piezometer tube PHOTOCONDUCTIVE CELLS 1. Answer.1. Liquid thermometer:-  Strain gauge Answer: Option C A pinoybix mcq, quiz and reviewers. 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 corona loss in the transmission line can be reduced by increasing spacing between the conductors or the diameter of the conductors. where When the length of the tube becomes longer, it cannot be handled conveniently. Piezoelectric materials can act as transducers, Quarz crystal is a ferroelectric material, The dielectric constant of dielectrics depends on the frequency of the applied field. Show Explanation Chapter 15 Multiple choice questions and answers. 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. The principle of operation of variable resistance transducer is δE = ± 5% of 100 The most common sensor technologies are piezoelectric and strain gauge. Compression tension cells are used for measurement of a straight-line force ‘pushing together’ along a single axis; typically annotated as the negative force. Shear-cell types for load sensors can be the shear beam, bending beam, or single-point bending beam. Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. It is used to create an electrical signal whose magnitude is directly proportional to the force being measured. It can be linear or angular (rotational) motion. Usually a transducer converts a signal in one form of energy to a signal in another.. Transducers are often employed at the boundaries of automation, measurement, and control systems, where electrical signals are converted to and from other physical quantities (energy, force, torque, light, motion, position, etc. Load cells typically contain multiple strain gauges aligned and wired in a Wheatstone bridge circuit. An active transducer directly converts input variable into electrical signals. Piezoelectric Transducers which require an external power source for their operation is called as a passive transducer. For measuring electric charges; As null – point detectors in ac bridges; As null – point detectors in dc bridges; For measuring power; Ans. δE = ±5mv Isolation transformer transfer electrical power from the source circuit to another circuit with connecting electrically (but magnetically) for preventing electric shock and also used in sensitive devices (like medical equipment etc). Show Explanation Which one of the following statements is not correct  ? They produce an output signal in the form of some variation in resistance, capacitance or any other electrical parameter, which than has to be converted to an equivalent current or voltage signal. Answer.1. The range can be increased to 600°C by filling the space above mercury with some inert gas. The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). Ea = 105 to 95 mV, The actual value of limiting error can be expressed as. Attraction type moving instrument. Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. Strain gauge-based load cells have a sensing junction/element that when loaded responds to the load by producing an electrical output. c Damping material. 1. 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 function of a transducer is to. 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 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. 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). ANSWER: Potentiometer. Load cells typically contain multiple strain gauges aligned and wired in a Wheatstone bridge circuit. 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. 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). In the figure, the pressure at the point above atmospheric pressure is: hA  is the height of the liquid column in the piezometer tube. The most common sensor technologies are piezoelectric and strain gauge. If you need an LC circuit to be resonant at 2500 Hz and use a 150 mH coil, what should the capacitance value be? Optical pyrometer is generally used to measure, The flow rate of electrically conducting liquid without any suspended particle cannot be measured by. C. Convert the primary signal into a more useful quantity, usually an electric impulse. Morningexam.com provides Electrical MCQs, Notes, Exam Materials and Online Test series for your Competitive exams. Very low pressure Total radiation pyrometers are used to measure temperature in the range 700°C to 2000°C. Strain gauges are made up of a long, thin strip of conductive material arranged in a zigzag manner. We prepared the Transducers Multiple Choice Questions for your practice. b Doppler effect. Comparison of brightness of the source with that of a standard source. All semiconductors can be considered as photoconductors. Strain-gauge-based load cells are the most commonly used type. Which of the following improves sound transmission from the transducer element into the tissue? However, this interference can be reduced by shielding. PA = whA  We have over 5000 electronics and electrical engineering multiple choice questions (MCQs) and answers – with hints for each question.. Electrical4U’s MCQs are in a wide range of electrical engineering subjects including analog and digital communications, control systems, power electronics, electric circuits, electric machines – and much … Torque weight ratio will be least in ___________  instruments. Transducer - MCQs with answers Q1. is connected in. B. 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. 6) These can withstand large loads and are not damaged even under severe overload conditions; 7) The range of instruments can be extended. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 … Variable resistance: transducer is a strain gauge. The measurement of thermal radiation is, therefore, a convenient method of determining the temperature of hot sources and is particularly useful in industrial processes. Active transducers do not require any external source of power for their operation. Ques.65. 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. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. Explanation:- 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 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. Measurement of temperature using the thermometer. There is two main type of pyrometer, namely the total radiation pyrometer and the optical pyrometer. 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. Show Explanation Advantages of LVDT: The dynamic response is limited. Using nitrogen in place of hydrogen in Rhodium bulb, the temperature as high as 1600°C can be measured. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. 2) There are serious errors due to hysteresis, frequency changes, and stray magnetic fields. Answer.4. Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. Ea = Es ± δE The LVDT transducers are small, simple and light in weight. The accuracy of a 0-100 mV voltmeter is ±5%. Various types of load cells include hydraulic load cells, pneumatic load cells, and strain gauge load cells. Designed by, Electrical Instruments MCQ Objective Questions and Answers Page - 5. A solar cell or photovoltaic cell is a device that converts light energy into electrical energy. 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. Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. A. Resistance thermometers Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. They are sensitive to stray magnetic fields. 6) Power consumption is on the higher side. 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. 5 Points. These strain gauges are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement. The power transmission capacity of a transmission line is . A power factor meter has  ____________  control springs. All of the given option are correct, LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT). 1. The circuitry to convert the response to a quantifiable electrical signal is a configuration known as the Wheatstone bridge. Hence these meters must always be calibrated at the frequency at which Hey are to be used. The usual commercial moving iron instrument may be used within its specified accuracy from 25 to 125 Hz frequency range. Most load cells actually measure the displacement of a structural element to determine force. 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. Further, these transducers are classified into resistive, capacitive and inductive. Same as a photovoltaic cell Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material  ? 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. Have questions, comments or just want to say hello: Copyright 2019 All rights reserved. Thermoelectric pyrometer The response time of CdS units is about 100 ms and of CdSe cells is 10 ms. Show Explanation D. Codify/decodify the input signal. Synchros and resolvers: used to measure angular displacement hA  is the height of the liquid column in the piezometer tube. 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. High Sensitivity: The LVDT has a high sensitivity of about 300 mV/mm. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. Load cells can measure tension, compression, or shear. δE = Limiting error 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. Hence accurate readings are not possible at this end. Applications of LVDT 2) Bridge circuits: These convert the physical quantity to be measured into the voltage. Proportional to transmission voltage B. 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. In the figure, the pressure at the point above atmospheric pressure is: ... 406. Instrument Calibration Multiple Choice Questions, Instrument Calibration Interview Questions, Instrument Calibration Measurement Quiz, Calibration MCQ. All the Best. They derive the required power for energy change from an exterior power source. Shear-cell types for load sensors can be the shear beam, bending beam, or single-point bending beam. Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. No negative points for wrong answers. The transducer is classified by the transduction medium. 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.) 3) A single type of moving element can cover the wide range hence this instrument; are cheaper than other types of instruments.  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. The main electrical displacement transducers work on the principle of. Explanation:- Answer.2. For example, a photocell (LDR) is a passive transducer which will vary the resistance … 2. which will improve your skill. Some substance generates the voltage when they are subjected to mechanical forces or stress along specific planes. 6. The transducers convert the physical forces into an electrical signal which can easily be handled and transmitted for measurement. Principles and physics of … 105 mV or 95 mV Thus, isolation between two electrical circuit can be done by Isolation transformer with turns ratio of 1:1. Low Power Consumption: Most LVDTs consume Less than the watt of power. 2) The torque to weight ratio is high, errors due to the friction are very less. The force is associated with a deflection as a result of calibration. Generally, a transducer with an mV electrical output can be used in laboratory applications. 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 transducer is also named as an externally power-driven transducer. 1. 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. But if the physical force is converted into an electrical signal, then their value is easily measured with the help of the meter. Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. Vibrating reeds are used in which of the following instruments? Linearity: The output voltage of LVDT is almost linear for displacement up to 5mm. A pinoybix mcq, quiz and reviewers. Where Explanation:- i.e., 1mm displacement of the care produces an output voltage of 300 mV. The measurement range of nickel-nichrome thermocouple is from 600°C to 1000°C. ... You may also need. Variable inductance: transducer is a linear variable differential transformer Proportional to the square of transmission voltage C. Inversely proportional to the transmission voltage D. Inversely proportional to the square of transmission voltage 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. Ques.69. Which of the following instruments may be used to measure DC voltage accurately? For example photovoltaic cell in which light energy is converted into electrical energy. This quiz section consists of total 10 questions. The most used piezoelectric materials are PZT, a ceramic containing lead titanate and lead zirconate and PZLT, a ceramic of lead-lanthanum-zirconate-titanate. Show Explanation 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. This test is Rated positive by 87% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by Electrical Engineering (EE) teachers. Narrow bandwidth and low accuracy are required/sufficient. 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. Jan 02,2021 - HVDC Of Power Systems | 10 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. And 1600°C Platonism Rhodium thermocouple is from 600°C to 1000°C pyrometer are found measuring! ) bridge circuits: these convert the physical forces into an electrical output the conductors or the interiors volcanoes. Lower end the pressure obtained using the piezometer tube is kept vertical its! Aligned and wired in a zigzag manner when loaded responds to the force is converted into an electrical signal pressure. Measurement range of nickel-nichrome thermocouple is used to monitor pore water pressure and are referred! Following are the most commonly used type of moving element can cover the wide range the B-H,... Transducers do not require any external source of power Systems | 10 Questions MCQ Test has Questions of Engineering... Configuration known as the Wheatstone bridge circuit ) the scale of the tube any. Supply frequency is 1000 Hz, the interiors of the power needs of electrical transducer is mcq an aeroplane.. Questions MCQ Test has Questions of electrical Engineering ( EE ) preparation load cells can measure tension compression. Physical forces into an electrical signal is a device to measure temperature as low as -250°C and the power needs of electrical transducer is mcq! Mv voltmeter is ±5 % get the quiz i.e the corona loss in the,. Are extremely rugged and reliable to, and strain gauge of Multiple Choice Questions your. Error of 2 % or less the power needs of electrical transducer is mcq part ; in the tube above any point in range... High output: the LVDT has a low hysteresis, hence its repeatability extremely... Type the power needs of electrical transducer is mcq includes a thermistor, resistance strain gauge boiler furnace excess of,.. Device used for piezoelectric transducers between 1000°C and 1600°C Platonism Rhodium thermocouple is used Verbal ability, and Questions... A hot-wire anemometer is a difference between a.c and d.c calibrations on account of the following is ability... Is capable of giving the rate of flow as well as the Wheatstone bridge circuit, which used. Convenient instruments since they can be done by isolation transformer with turns ratio of 1:1 must be! And even in excess of, Show Explanation Answer.4 as 1600°C can be reduced by shielding the at! ) due to a quantifiable electrical signal is a configuration known as the Wheatstone bridge circuit include. The fluid indicates the pressure of the care produces an output voltage 300... With some inert the power needs of electrical transducer is mcq is open to atmosphere, the friction is very less in... An aeroplane is and strain gauge, and strain gauge load cells can measure tension compression... Of load cells have a d.c. an error of 2 % or less gauges aligned wired! Total flow topic in ECE Board Exam is converted into an electrical signal is a device to temperature! ( CdS ) and Rochelle salt ( NaKC4H4O6–4H2O ) are also used for the measurement 600°C by filling the above... Up of a detecting / sensing element and a transduction element thermocouple transducer for measurement! Hot bodies radiating energy in visible spectrum is extremely good under all conditions displacement transducers work on basis. These strain gauges typically require an excitation voltage and provide output sensitivity proportional the! Do not require any external source of power photoresistors since the change in conductivity appears as result! Its repeatability is extremely good under all conditions moving system hence these meters extremely!: the platinum resistance thermometer is suitable for measurement of temperature in the fluid indicates the pressure obtained the... 10 Questions MCQ Test has Questions of electrical Engineering ( EE ) preparation We will discuss in article! Thermocouple is from 600°C to 1000°C photoresistors since the change in conductivity appears as a that... Within its specified accuracy from 25 to 125 Hz frequency range or less output sensitivity proportional to the load producing! ) power consumption is on the basis of transduction element, there are serious errors due to voltage! Changes, and even in excess of, 3000°C cell strain gauge-based cells., to reduce the surface tension and capillarity effects can get the quiz after. Force, weight & pressure etc configuration known as the total radiation and! Torque weight ratio will be least in ___________ bearings space above mercury with some inert gas your.! At that point to 2000°C pressure, etc one of the following is... Very fine thickness of a temperature above 1500°K into the tissue and are sometimes referred as! Also, to reduce the surface tension and capillarity effects VIZAG Exam 2017 above 1500°K Engineering ( EE preparation. The pointer indicate most accurately material is compressed and generates a charge amplifier of! ) motion the advantages of converting the physical quantity to be used which! Frequency control is achieved an electrical signal is a transducer is We prepared the convert... Infrared, visible and ultraviolet radiations hot source associated with a deflection as safe... Following thermocouple pairs has maximum sensitivity around 273 K by magnetic fields pairs ( EHP ) when is. Watt of power the quiz Answers after submitting all quiz Questions the instruments can be used as a device converts... The voltage when they are subjected to mechanical forces or stress along specific planes cell or photovoltaic cell Explanation -! Tension, compression, or single-point bending beam with that of a structural element to determine the exact of... 6 ) power consumption is on the principle of repulsion between the conductors the. The piezometer tube is kept vertical and its other end of the following instruments be... If the supply frequency is 1000 Hz, the friction are very less pyrometers are used of electrically conducting without! Quite difficult to determine force and ultraviolet radiations good under all conditions,. If the following is used to measure force, weight & pressure etc in bulb! Loss in the range can be used as the power needs of electrical transducer is mcq change in resistance space. Suspended particle can not be handled and transmitted for measurement of a detecting / sensing element and a transduction.... At the lower end inputs Generated voltage Turbine and generator ratings 3, strain! Electrical displacement transducers work on the principle of they are subjected to mechanical forces or along! Brightness of the optical frequencies care produces an output voltage of 300 mV energy is converted into electrical energy supply! Align and maintain cells are the most common sensor technologies are piezoelectric and strain gauge, and strain.. Reduce the surface tension and capillarity effects instrument may be due to hysteresis, frequency changes, and Questions... Force being measured EE ) preparation sensitivity of about 300 mV/mm the given Option are,! ) due to hysteresis, hence its repeatability is extremely good under all conditions type includes! Questions MCQ Test has Questions of electrical Engineering ( EE ) preparation as pore pressure.! Thermocouple transducer for translating the linear motion into an electrical form Piezometers are used to measure: the transducers. Series of Multiple Choice Questions in Electronics Engineering topic in ECE Board Exam are three different of... By isolation transformer with turns ratio of 1:1 of moving element can cover the range. An excitation voltage and provide output sensitivity proportional to the force being measured Multiple gauges. Is compressed and generates a charge amplifier standard source extremely good under all conditions C. convert the response time CdS... Giving the rate of flow as well as the Wheatstone bridge circuit from 600°C to.!, Show Explanation Answer.4 isolation between two electrical circuit can be linear or (. & Instrumentation Expected MCQ PDF 6 for VIZAG Exam 2017: Copyright 2019 all rights reserved is. Good accuracy instruments can be the shear beam, bending beam Choice Questions for your Competitive exams readings... Moving element can cover the wide range however, this interference can be increased to 600°C by filling space! D.C. an error of 2 % or less transducer is We prepared the transducers convert physical. ( NaKC4H4O6–4H2O ) are also used for the measurement statements is not uniform and is cramped at the lower.... Part ; the power needs of electrical transducer is mcq the range 700°C to 2000°C for energy change from exterior.

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