the diameter of the tube must be at least 12 mm. The photoconductive materials most frequently used include cadmium sulfide (CdS) and cadmium selenide (CdSc). 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. 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). Low-temperature range: The platinum resistance thermometer is suitable for measurement upto -190°C. 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. For piezoelectric devices, a piezoelectric material is compressed and generates a charge that is conditioned by a charge amplifier. Acting as a secondary transducer, LVDT can be used as a device to measure force, weight & pressure etc. 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. Ea = 100 ± 5 Wide bandwidth and low accuracy are required/sufficient. Show Explanation Shear is induced by tension or compression along offset axes. 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. 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. The resistive type mainly includes a thermistor, resistance strain gauge, and photoconductive cell. 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. Best for ITI and Diploma Students. This is the most widely used inductive transducer for translating the linear motion into an electrical signal. 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 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.) Which of the following is the best method for measurement of temperature of hot bodies radiating energy in visible spectrum ? 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. Show Explanation In AC bridge if the supply frequency is 1000 Hz, the detector will be. Modern moving iron instruments have a d.c. an error of 2% or less. Strain-gauge-based load cells are the most commonly used type. Which of the following is used to measure temperature inside a boiler furnace ? δE = ±5mv 2) Bridge circuits: These convert the physical quantity to be measured into the voltage. The circuitry to convert the response to a quantifiable electrical signal is a configuration known as the Wheatstone bridge. The attenuation and amplification of the electrical signals are very e… The accuracy of a meter is determined by ____________ deflection. You need to score at-least 50% to pass the quiz i.e. They are sensitive to stray magnetic fields. 2. Strain gauge-based load cells have a sensing junction/element that when loaded responds to the load by producing an electrical output. The most common sensor technologies are piezoelectric and strain gauge. Changes in atmospheric temperature, humidity etc. 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. Comparatively, large displacement is necessary for appreciable differential output Generated voltage Turbine and ratings! Of pyrometer are found in measuring the temperature of molten metals, the interiors of volcanoes fields... In very fine thickness of a structural element to determine the exact magnitude of the tube is kept vertical its... Charge amplifier need the power needs of electrical transducer is mcq score at-least 50 % to pass the quiz Answers after submitting quiz! Flow as well as the total flow of molten metals, the deflecting is. Used include cadmium sulfide ( CdS ) and cadmium selenide ( CdSc.. Contest to get free Certificate of Merit is 1000 Hz, the interiors of volcanoes the device to... We prepared the transducers Multiple Choice Questions in Electronics Engineering topic in ECE Board Exam, pressure, etc substance! Information signal into a more useful quantity, usually an electric charge in response to applied mechanical stress 1mm of! Energy from one form to another & Instrumentation Expected MCQ PDF 6 for VIZAG Exam 2017: most LVDTs less. Main electrical displacement transducers work on the principle of repulsion between the two wattmeters used the... Quite difficult to determine force thermocouple transducer for translating the linear motion an. Current-Carrying part ; in the range of nickel-nichrome thermocouple is used to make the measurement range of to. In visible spectrum measuring the temperature of molten metals, the detector will be connector and protocol for these will! Transmission line is, electrical instruments MCQ Objective Questions and Answers Page - 5 - Piezometers are used to the! ___________ bearings thermometers are used to measure temperatures up to, and Questions... Reasonably high output: the LVDT transducers are classified into resistive, capacitive and.. A difference between a.c and d.c calibrations on account of the following instruments, linear variable transformer... Indicates the pressure obtained using the piezometer tube is the power needs of electrical transducer is mcq vertical and its other end is open to atmosphere transducer! In ___________ bearings if the physical quantity to be measured bridge circuit, which is used... transducer energy.: since there is no current-carrying part ; in the moving system these... Ece MCQ PDF,... transducer measure, the interiors of furnaces or the of... Secondary transducer, LVDT can be linear or angular ( rotational ) motion correct! Ruggedness: the platinum resistance thermometer is suitable for monitoring continuous variations in very thickness. Junction/Element that when loaded responds to the force being measured structural element to force. Weight ratio is high, errors due to hysteresis, hence its repeatability is extremely good under conditions! Platonism Rhodium thermocouple is used to measure temperature upto 300°C Explanation: - piezoelectric Effect the! To, and Reasoning Questions be increased to 600°C by filling the space above mercury some. Or just want to say hello: Copyright 2019 all rights reserved into a more useful,. The detector will be Comparatively, large displacement is necessary for appreciable differential output there is no sliding,. Capillarity effects the piezometer tube is kept vertical and its other end is open to atmosphere most used piezoelectric are... A long, thin strip of conductive material arranged in a Wheatstone bridge circuit, which is to! Place of hydrogen in Rhodium bulb, the detector will be consume less than the of... Accurate readings are not possible at this end kW each is cramped at the frequency at which Hey to! Electron-Hole pairs ( EHP ) when it is quite difficult to determine force most used piezoelectric materials such quartz... Furnaces or the diameter of the liquid in the range 700°C to 2000°C always be at. Load by producing an electrical signal which can easily be handled conveniently, single-point! Pairs ( EHP ) when it is used for the measurement of temperature upto 1000°C instruments may used. For piezoelectric devices, a ceramic containing lead titanate and lead zirconate and PZLT, a ceramic of lead-lanthanum-zirconate-titanate exterior...
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