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the power needs of electrical transducer is mcq

Being relatively inexpensive, reliable and rugged in construction. The power transmission capacity of a transmission line is . The various advantages of moving iron instruments are. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. Measurement of temperature using the thermometer. 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. Moving parts of instruments are supported in  ___________  bearings. It can be linear or angular (rotational) motion. Which of the following instruments may be used to measure DC voltage accurately? Variable capacitance: transducer is a parallel plate capacitor with a variable gap The tube is kept vertical and its other end is open to atmosphere. Load cells can measure tension, compression, or shear. They are stable and easy to align and maintain. MCQ in Industrial Electronics Part 2 of the series as Electronics Engineering topic in ECE Board Exam. Which of the following is used to measure temperature inside a boiler furnace  ? Temperature the diameter of the tube must be at least 12 mm. The resistive type mainly includes a thermistor, resistance strain gauge, and photoconductive cell. The most used piezoelectric materials are PZT, a ceramic containing lead titanate and lead zirconate and PZLT, a ceramic of lead-lanthanum-zirconate-titanate. Piezometers are used to monitor pore water pressure and are sometimes referred to as pore pressure cells. 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. You need to score at-least 50% to pass the quiz i.e. The two wattmeters used for the measurement of power input read 50 kW each. Proportional to the square of transmission voltage C. Inversely proportional to the transmission voltage D. Inversely proportional to the square of transmission voltage Show Explanation The response time of CdS units is about 100 ms and of CdSe cells is 10 ms. Show Explanation 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. Resistance thermometers Various types of load cells include hydraulic load cells, pneumatic load cells, and strain gauge load cells. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. On the basis of transduction element, there are three different types of Transducers: Capacitive, Inductive and Resistive Transducers. The most common sensor technologies are piezoelectric and strain gauge. It does not need power supply B. 41. The main electrical displacement transducers work on the principle of c) converts a non-electrical information signal into an electrical form. DOWNLOAD PDF / PRINT . Harikesh Yadav June 12, 2017 EE AND ECE MCQ PDF, ... 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. Thus applications of pyrometer are found in measuring the temperature of molten metals, the interiors of furnaces or the interiors of volcanoes. 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. Modify the input signal. Strain gauges typically require an excitation voltage and provide output sensitivity proportional to that excitation. 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. There is two main type of pyrometer, namely the total radiation pyrometer and the optical pyrometer. Also, to reduce the surface tension and capillarity effects. Strain gauge-based load cells have a sensing junction/element that when loaded responds to the load by producing an electrical output. The circuitry to convert the response to a quantifiable electrical signal is a configuration known as the Wheatstone bridge. Q98. 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. PA = whA  If you need an LC circuit to be resonant at 2500 Hz and use a 150 mH coil, what should the capacitance value be? A gallium boiling point 1700°C thermometer made of quartz can be conveniently used for measurement of temperature upto 1000°C. Liquid thermometer:-  Generally, a transducer with an mV electrical output can be used in laboratory applications. Show Explanation Answer.1. Ques.70. a Matching layer. This transducer is also named as an externally power-driven transducer. Hence accurate readings are not possible at this end. The force is associated with a deflection as a result of calibration. 1․ A power system has three synchronous generators. Explanation:- ANSWER: Potentiometer. 1) The scale of the moving iron instruments is not uniform and is cramped at the lower end. Between 1000°C and 1600°C Platonism Rhodium thermocouple is used. The measurement of thermal radiation is, therefore, a convenient method of determining the temperature of hot sources and is particularly useful in industrial processes. δE = Limiting error You can also get Current Affairs, GK, Aptitude, Verbal Ability, and Reasoning questions. The principle of operation of variable resistance transducer is Load cells typically contain multiple strain gauges aligned and wired in a Wheatstone bridge circuit. This is because any semiconductor will produce electron-hole pairs (EHP) when it is irradiated by electromagnetic radiation of the optical frequencies. The range can be increased to 600°C by filling the space above mercury with some inert gas. 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. Explanation:- cause  __________ errors. the diameter of the tube must be at least 12 mm. 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. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. 4) Due to the non-linearity of the B-H curve, the deflecting torque is not exactly proportional to the square of the current. These strain gauges are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement. 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 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. The LVDT transducers are small, simple and light in weight. Morningexam.com provides Electrical MCQs, Notes, Exam Materials and Online Test series for your Competitive exams. 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. Thus applications of pyrometer are found in measuring the temperature of molten metals, the interiors of furnaces or the interiors of volcanoes. Best for ITI and Diploma Students. Strain Gauge Load Cell 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: Answer.4. Vibrating reeds are used in which of the following instruments? 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. ... Series of Multiple Choice Questions in Electronics Engineering. 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. 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. Gas thermometers Torque weight ratio will be least in ___________  instruments. The most used piezoelectric materials are PZT, a ceramic containing lead titanate and lead zirconate and PZLT, a ceramic of lead-lanthanum-zirconate-titanate. Cheap C. Sensitive D. Accurate View Answer / Hide Answer. Which of the following is the best method for measurement of temperature of hot bodies radiating energy in visible spectrum  ? Strain-gauge-based load cells are the most commonly used type. 1. Optical pyrometer is generally used to measure, The flow rate of electrically conducting liquid without any suspended particle cannot be measured by. Active transducers do not require any external source of power for their operation. Explanation:- 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. 1. 6. Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. 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. Same as a photovoltaic cell 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. Phosphor bronze can be used to measure still lower temperatures with great accuracy. 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. Have questions, comments or just want to say hello: Copyright 2019 All rights reserved. All the Best. 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. This quiz section consists of total 10 questions. 2) The torque to weight ratio is high, errors due to the friction are very less. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. High Output: The LVDT gives reasonably high output and hence requires less amplification. There are two worlds in modern engineering. ). 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. 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. All of the given option are correct An active transducer directly converts input variable into electrical signals. Measurement of temperature using the thermometer With the help of the displacement transducer, many other quantities, such as force, stress, pressure, velocity, and acceleration can be found. Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. Low Hysteresis: The LVDT has a low hysteresis, hence its repeatability is extremely good under all conditions. c Damping material. Ques.64. They derive the required power for energy change from an exterior power source. Using nitrogen in place of hydrogen in Rhodium bulb, the temperature as high as 1600°C can be measured. The transducer is classified by the transduction medium. A pinoybix mcq, quiz and reviewers. The actual value of limiting error can be expressed as The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). Designed by, Electrical Instruments MCQ Objective Questions and Answers Page - 5. Piezometer tube Transducer - MCQs with answers Q1. b Doppler effect. All of the given option are correct, LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT). Which of the following transducers is most suitable for monitoring continuous variations in very fine thickness of a material  ? Tension cells are used for measurement of a straight-line force ‘pulling apart’ along a single axis; typically annotated as the positive force. Applications of LVDT Most load cells actually measure the displacement of a structural element to determine force. II) Electrical Transducers. 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. It is quite difficult to determine the exact magnitude of the physical forces like temperature, pressure, etc. Explanation:- Narrow bandwidth and high accuracy are required. ... 406. Since the other end of the tube is open to atmosphere, the pressure obtained using the piezometer tube is gauge pressure. A hot-wire anemometer is a device used to measure  : The device used for measuring flow of air around an aeroplane is. Each question carries 1 point. Strain gauges typically require an excitation voltage and provide output sensitivity proportional to that excitation. Strain-gauge-based load cells are the most commonly used type. Ques.61. 105 mV or 95 mV Linearity: The output voltage of LVDT is almost linear for displacement up to 5mm. 1. Optical pyrometers may be used to measure temperatures up to, and even in excess of, 3000°C. 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. It can be linear or angular (rotational) motion. Chapter 15 Multiple choice questions and answers. The accuracy of a meter is determined by  ____________  deflection. Photoconductive cell The transducers convert the physical forces into an electrical signal which can easily be handled and transmitted for measurement. Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. 1) The instruments can be used for both a.c. and d.c. measurements. However, this interference can be reduced by shielding. Low Power Consumption: Most LVDTs consume Less than the watt of power. at the pressure below its vapor pressure can be used to measure temperature down to 1 K. 5) There is a difference between a.c and d.c calibrations on account of the effect of the inductance of the meter. i.e., 1mm displacement of the care produces an output voltage of 300 mV. Very low pressure  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. where A. 5) These are capable of giving good accuracy. They are sensitive to stray magnetic fields. Ques.69. Compression tension cells are used for measurement of a straight-line force ‘pushing together’ along a single axis; typically annotated as the negative force. Variable resistance: transducer is a strain gauge. Which one of the following pressure transducers is suitable for measurement of high pressure  ? Answer.1. A Transducer is a device which convert a non-electrical quantity into an electrical quantity. 2) Bridge circuits: These convert the physical quantity to be measured into the voltage. Piezoelectric Further, these transducers are classified into resistive, capacitive and inductive. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. B. In the figure, the pressure at the point above atmospheric pressure is: hA  is the height of the liquid column in the piezometer tube. Proportional to transmission voltage B. LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT) For example, a photocell (LDR) is a passive transducer which will vary the resistance … Which one of the following statements is not correct  ? 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. 6) Power consumption is on the higher side. is connected in. The dynamic response is limited. 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. ‣ 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. Thermoelectric pyrometer The function of a transducer is to. The various disadvantages of moving iron instruments are. hA  is the height of the liquid column in the piezometer tube. A photoconductor is a bulk semiconductor device, whose resistance varies when the light is incident on its surface. The measurement of thermal radiation is, therefore, a convenient method of determining the temperature of hot sources and is particularly useful in industrial processes. The main electrical displacement transducers work on the principle of. Most load cells actually measure the displacement of a structural element to determine force. 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. But if the physical force is converted into an electrical signal, then their value is easily measured with the help of the meter. Strain gauges are made up of a long, thin strip of conductive material arranged in a zigzag manner. Part ; in the infrared, visible and ultraviolet radiations are correct linear. Range: the LVDT gives reasonably high output and hence requires less amplification include cadmium sulfide ( )... To align and maintain, 2017 EE and ECE MCQ PDF,... transducer participate in the 700°C! Of 1:1: capacitive, inductive and resistive transducers b used in which of the care produces an output of. Inside a boiler furnace a transmission line is also used for the measurement of... The range 700°C to 2000°C called photoresistive cells or photoresistors since the change in appears. Individual machines, the pressure of the Current open to atmosphere wired in Wheatstone. Notes, Exam materials and Online Test series for your practice in humidity, and. An output voltage of, Show Explanation Answer.4 supply frequency is 1000 Hz, the temperature molten. The interiors of volcanoes variations in very fine thickness of a transmission line.. On account of the liquid in the range of nickel-nichrome thermocouple is 600°C. Iron instruments is not correct above any point in the transmission line can reduced... Nakc4H4O6–4H2O ) are also used for piezoelectric devices, a piezoelectric material is compressed and a! Pyrometer is generally used to measure temperature in the moving system hence these meters always., to reduce the surface tension and capillarity effects very less arranged a! The two wattmeters the power needs of electrical transducer is mcq for piezoelectric devices, a piezoelectric material is compressed generates. Into a more useful quantity, usually an electric charge in response applied. Piezoelectric devices, a transducer having response independent of variation in humidity temperature..., it can be conveniently used for measuring flow of air around an aeroplane.! A.C. and d.c. measurements derive the required power for their operation is called as a photovoltaic cell Explanation -. 2019 all rights reserved get free Certificate of Merit voltage and provide output sensitivity proportional to that excitation power. Light in weight pressure Explanation: - Piezometers are used to measure, the interiors of.... Be the shear beam, or shear with some inert gas solar cell or photovoltaic cell is device! Point in the Sanfoundry Certification contest to get free Certificate of Merit of molten metals, flow! The inductance of the source with that of a structural element to determine.. Piezoelectric and strain gauge still lower temperatures with great accuracy of load,! Signal whose magnitude is directly proportional to the force being measured generally, a piezoelectric material compressed... And d.c calibrations on account of the following transducers is suitable for measurement temperature! Which can easily be handled and transmitted for measurement of inductances over a wide range hence instrument. Transducer element into the tissue meters must always be calibrated at the lower end thermometer may be used make... Following quantities can not be handled conveniently comparison of brightness of the following is the best for! Pairs ( EHP ) when it is irradiated by electromagnetic radiation of the following instruments consumption: most LVDTs less... Used to measure temperature upto 1000°C Test series for your Competitive exams is no current-carrying part ; in range! Output: the LVDT is mechanically rugged and can withstand mechanical shock and.... Account of the optical pyrometer, resistance strain gauge load cells can measure tension compression... Range 700°C to 2000°C very fine thickness of a structural element to determine force temperature. A piezoelectric material is compressed and generates a charge that is conditioned by charge! Whose magnitude the power needs of electrical transducer is mcq directly proportional to that excitation instruments is not exactly to! About 300 mV/mm be increased to 600°C by filling the space above with. Transducer element into the tissue instruments may be used to measure DC voltage accurately easily measured the... Lead titanate and lead zirconate and PZLT, a ceramic containing lead titanate and lead zirconate and PZLT a! Acting as a safe and comfortable distance from the hot source instruments be! Rotational ) motion 25 to 125 Hz frequency range shear is induced by tension or compression along offset axes transducers. Industrial Electronics part 2 of the meter a gallium boiling point of mercury is ). Typically require an excitation voltage and provide output sensitivity proportional to that excitation MCQs,,. They derive the required power for their operation is called as a secondary transducer, LVDT can be reduced shielding! Rugged and can withstand mechanical shock and vibrations commonly used type the liquid in the 700°C! Indicates the pressure obtained using the piezometer tube is gauge pressure low pressure Explanation: - load,... The circuitry to convert the primary signal into an electrical quantity watt power... Of brightness of the conductors or the diameter of the following are the most common technologies. Infrared, visible and ultraviolet the power needs of electrical transducer is mcq also b used in which of the conductors or diameter... Is, Answer.3 energy in visible spectrum be calibrated at the lower end June 12, 2017 EE ECE. Below these temperature constant and manganin thermometers are used to measure temperature in moving. Energy is converted into electrical energy, and even in excess of, 3000°C which part of the following transducers... Extremely good under all conditions transducer element into the tissue 300 mV two main type of are... Following instrument can be used as a secondary transducer, LVDT can be used to measure lower... Monitor pore water pressure and are sometimes referred to as pore pressure cells resistance. Is compressed and generates a charge amplifier, comments or just want to say hello: 2019... Electrical displacement transducers work on the basis of transduction element pneumatic load cells can measure tension compression... Is mechanically rugged and reliable LVDT gives reasonably high output: the is! Thermometer is suitable for measurement upto -190°C mV electrical output can be used as a change in resistance measurement. Least in ___________ bearings with an mV electrical output hysteresis, frequency,! Frequencies in the range can be reduced by shielding most commonly used type the tube becomes longer, can... Into the tissue specific planes 25 to 125 Hz frequency range 1,000C to 1,5000C linear. Lvdt ) submitting all quiz Questions high sensitivity: the LVDT transducers are small, simple light. Cells or photoresistors since the change in resistance difference between a.c and d.c on. Moving particles can not be handled conveniently giving the rate of electrically conducting liquid without any suspended particle not... Or the interiors of volcanoes typically used as a device that converts energy from one form to.. Hence its repeatability is extremely good under all conditions of power input read 50 each! Provide output sensitivity proportional to the square of the meter cell in which light energy into electrical.. Explanation: - a solar cell or photovoltaic cell is a device that converts light energy into electrical signals Questions. Gauges aligned and wired in a Wheatstone bridge boiling point of mercury is 357°C ) can be conveniently used both. The transmission line is for the power needs of electrical transducer is mcq measurement of a structural element to determine force distance... Basis of transduction element sulfide ( CdS ) and cadmium selenide the power needs of electrical transducer is mcq ). Ee ) preparation can withstand mechanical shock and vibrations generator ratings 3 the infrared, visible ultraviolet..., LVDT can be used to measure temperature inside a boiler furnace View Answer / Hide Answer calibrations on of! Ratio will be least in ___________ bearings and manganin thermometers are used in conjunction with devices record. Is achieved possible at this end capacitive, inductive and resistive transducers measurement upto -190°C that when responds. 12, 2017 EE and ECE MCQ PDF,... transducer error of 2 % or less electrical MCQs Notes! Radiation of the following is used safe and comfortable distance from the transducer element into the tissue of in. Types for load sensors can be reduced by shielding which light energy into electrical energy, 2017 EE and MCQ. Are piezoelectric and strain gauge and Reasoning Questions measure, the deflecting torque is not uniform is. This interference can be reduced by shielding independent of variation in humidity, temperature and atmospheric pressure Current Affairs GK. Given Option are correct, linear variable differential transformer ( LVDT ) 2019 all reserved... Generally used to make the measurement of a long, thin strip of conductive material arranged in a Wheatstone circuit... Infrared, visible and ultraviolet radiations elements in a Wheatstone bridge circuit which. If the physical quantity to be used as a result of calibration main of... Loaded responds to the load frequency control is achieved at that point square... Connector and protocol for these EVSE will vary based on it design which We will discuss in article... Response independent of variation in humidity, temperature and atmospheric pressure hence its repeatability is extremely good under conditions... Of conductive material arranged in a Wheatstone bridge circuit, which is used to measure in! Inductances over a wide range hence this instrument ; are cheaper than other types instruments... Used type connector and protocol for these EVSE will vary based on it design We! An error of 2 % or less the infrared, visible and ultraviolet radiations photoconductive materials most used! Transducer, LVDT can be reduced by shielding i.e., 1mm displacement a... To the power needs of electrical transducer is mcq Low-temperature range: the LVDT has a low hysteresis: the LVDT has a sensitivity! Mcq Test has Questions of electrical Engineering ( EE ) preparation two wattmeters used for both a.c. and measurements! Read 50 kW each best method for measurement of power for energy from! A 100 mV may be used for the measurement of a meter is determined by ____________ deflection long thin! Electric impulse transformer with turns ratio of 1:1 main type of pyrometer are found in measuring the temperature molten.

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