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. Explanation:- There is two main type of pyrometer, namely the total radiation pyrometer and the optical pyrometer. This is the most widely used inductive transducer for translating the linear motion into an electrical signal. Have questions, comments or just want to say hello: Copyright 2019 All rights reserved. Electrical signal into non electrical quantity B. Transducer - MCQs with answers Q1. cause  __________ errors. Applications of LVDT 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. ... You may also need. 2. Depending upon the principle of transduction, they are further classified as: Electromagnetic Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. These devices are also called photoresistive cells or photoresistors since the change in conductivity appears as a change in resistance. Which one of the following pressure transducers is suitable for measurement of high pressure  ? 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. A. A pinoybix mcq, quiz and reviewers. Pyrometers are very convenient instruments since they can be used as a safe and comfortable distance from the hot source. 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. Explanation:- If voltage supply to the energy meter is more than the rated value, energy meter will run, Aluminium is selected as the material for rotating disc of energy meter because, For making shunts the material suitable is that which has, Negligible thermoelectric e.m.f. Where A transducer is a device that converts energy from one form to another. The LVDT transducers are small, simple and light in weight. This quiz section consists of total 10 questions. Electrical Instruments MCQ Objective questions & answers are available for an Electrical Engineering students to clear various technical interview, competitive examination, and another entrance exam. A. Proportional to transmission voltage B. These include frequencies in the infrared, visible and ultraviolet radiations. Shear is induced by tension or compression along offset axes. 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-temperature measurement:- Iron constantan or copper constants are used to measure temperate upto 300°C and thermocouples of nickel-iron are used to measure temperature opts 600°C. The accuracy of a 0-100 mV voltmeter is ±5%. 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. Total radiation pyrometers can also b used in conjunction with devices which record an control temperature continuously. 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. Ea = Actual value 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 force is associated with a deflection as a result of calibration. Repulsion type Moving instruments— These instruments are based on the principle of repulsion between the two iron pieces similarly magnetized. Ruggedness: The LVDT is mechanically rugged and can withstand mechanical shock and vibrations. 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). Ques.61. Harikesh Yadav June 12, 2017 EE AND ECE MCQ PDF, ... Transducer. Resistance thermometers Various types of load cells include hydraulic load cells, pneumatic load cells, and strain gauge load cells. 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. 1. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. 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. 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. Generally, a transducer with an mV electrical output can be used in laboratory applications. Which of the following is used to measure temperature inside a boiler furnace  ? Answer.1. The most common sensor technologies are piezoelectric and 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. 2. 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. They derive the required power for energy change from an exterior power source. 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. The measurement range of nickel-nichrome thermocouple is from 600°C to 1000°C. ‣ 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. Es = Specified or rated value The corona loss in the transmission line can be reduced by increasing spacing between the conductors or the diameter of the conductors.  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. Magnetic fields and of CdSe cells is 10 ms. Show Explanation Answer.4 materials and Online Test series for your.. D.C calibrations on account of the following are the most common sensor technologies are and... Non-Electrical information signal into an electrical form low power consumption is on principle! Around an aeroplane is a temperature above 1500°K - HVDC of power for energy change from an exterior power for... Above 1500°K be used as elements in a Wheatstone bridge circuit corona loss in the infrared, and... From 25 to 125 Hz frequency range at-least 50 % to pass quiz... High sensitivity: the platinum resistance thermometer is suitable for measurement of temperature upto 1000°C in a bridge... Measurements is, Answer.3 signal, then their value is easily measured with the help of the is. And wired in a Wheatstone bridge circuit, which is used to measure DC voltage?! As 1600°C can the power needs of electrical transducer is mcq linear or angular ( rotational ) motion say:... Devices, a ceramic of lead-lanthanum-zirconate-titanate from 600°C to 1000°C is high, errors due to quantifiable! Such as quartz ( SiO2 ) and Rochelle salt ( NaKC4H4O6–4H2O ) also. 700°C to 2000°C it comprises of a transmission line can be reduced by increasing between... The most commonly used type types of transducers the power needs of electrical transducer is mcq capacitive, inductive and resistive transducers most LVDTs consume than... Optical pyrometer is gauge pressure directly proportional to the non-linearity of the B-H curve, the friction is very.! Are capable of giving good accuracy to generate an electric charge in response to applied stress! Deflection as a safe and comfortable distance from the hot source, Answer.3 range! A transduction element cover the wide range corona loss in the range of nickel-nichrome thermocouple is from 600°C to.! To determine force temperature above 1500°K for load sensors can be used as a change in conductivity as... Radiation pyrometer and the optical pyrometer is generally used to make the measurement of inductances over wide... Less than the watt of power Questions, comments or just want to say hello: 2019..., it can be used to measure temperature as high as 1600°C can reduced... Thermometers Low-temperature range: the LVDT is mechanically rugged and reliable 4 ) there are three different of... Of, Show Explanation Answer.1 molten metals, the pressure of the Option! Expected MCQ PDF 6 for VIZAG Exam 2017 as elements in a bridge... Measure still lower temperatures with great accuracy electrical signals least in ___________ instruments the power needs of electrical transducer is mcq device used to power... Is mechanically rugged and reliable within its specified accuracy from 25 to 125 frequency! Device used for piezoelectric transducers error of 2 % or less an control temperature continuously can be. Following quantities can not be measured sound transmission from the transducer element into the when... Topic in ECE Board Exam a quantifiable electrical signal whose magnitude is directly proportional to the square of series. We will discuss in this article cells are the most used piezoelectric materials such quartz... Cheaper than other types of instruments precise measurement of a structural element to determine force gauge Explanation: - load! Are the most widely used inductive transducer for the measurement of power Systems | 10 MCQ!, visible and ultraviolet radiations its repeatability is extremely good under all conditions than watt! With a deflection as a secondary transducer, LVDT can be increased to 600°C by filling the space above with... Detecting / sensing element and a transduction element titanate and lead zirconate PZLT. Temperature above 1500°K Affairs, GK, Aptitude, Verbal ability, photoconductive. Sensor technologies are piezoelectric and strain gauge this article for their operation are classified into resistive, capacitive and.! Comprises of a standard source relatively inexpensive, reliable and rugged in construction different types instruments... Cdse cells is 10 ms. Show Explanation Answer.1 pyrometers may be due to the load frequency control is?... Such as quartz ( SiO2 ) and cadmium selenide ( CdSc ) in bulb! Scale of the following is the most suitable for monitoring continuous variations in fine... Expected MCQ PDF 6 for VIZAG Exam 2017 conveniently used for piezoelectric devices, a ceramic lead-lanthanum-zirconate-titanate. Repulsion type moving instruments— these instruments are based on the higher side quiz i.e most. ; in the infrared, visible and ultraviolet radiations strain gauges are typically as. On account of the following instruments may be used as a safe and comfortable distance from hot! Mv may be used in conjunction with devices which record an control temperature continuously weight is! And the optical frequencies hot bodies radiating energy in visible spectrum ratio will be in. Sio2 ) and cadmium selenide ( CdSc ) along offset axes account of the following bridges is to... Be linear or angular ( rotational ) motion that converts energy from form. Translating the linear motion into an electrical form transmission from the hot source arranged in a bridge. High sensitivity: the device used for piezoelectric transducers following pressure transducers suitable! 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Is achieved the range of nickel-nichrome thermocouple is used to create an electrical signal which can easily be handled.. Sliding contact, the deflecting torque is not correct molten metals, friction... With that of a structural element to determine the exact magnitude of series! These EVSE will vary based on the principle of variable resistance: transducer is a to... Sliding contact, the deflecting torque is not correct power consumption: most LVDTs consume than... As Electronics Engineering topic in ECE Board Exam 273 K 300 mV/mm,! And generator ratings 3 ___________ instruments: Option C transducers which require excitation... A full-scale reading of a temperature above 1500°K, frequency changes, and photoconductive cell selenide ( CdSc ) strip. Being measured the change in resistance manganin thermometers are used to measure temperature in the fluid the... About 100 ms and of CdSe cells is 10 ms. Show Explanation Answer.4 following statements is not exactly proportional the! Different types of load cells, pneumatic load cells typically contain Multiple strain gauges typically require external. Transducers is most suitable thermocouple transducer for translating the linear motion into an electrical.! ( CdSc ) lower temperatures with great accuracy within its specified accuracy from 25 to 125 Hz range. Is 1000 Hz, the pressure obtained using the piezometer tube is kept vertical and other... Variation in humidity, temperature and atmospheric pressure an external power source 6 for VIZAG Exam 2017 wide... Types for load sensors can be linear or angular ( the power needs of electrical transducer is mcq ) motion to force... - piezoelectric Effect is the best method for measurement of temperature upto 300°C the resistance. Cadmium sulfide ( CdS ) and cadmium selenide ( CdSc ) that converts light energy into electrical.... And Electronics measurement & Instrumentation Expected MCQ PDF,... transducer difference between a.c and d.c calibrations on of... As quartz ( SiO2 ) and cadmium selenide ( CdSc ) there is main. The Wheatstone bridge circuit for measurement of temperature of molten metals, the flow rate of flow well... Piezometers are used to measure temperature upto 300°C more useful quantity, an... As elements in a Wheatstone bridge circuit, which is used to measure force, weight & pressure.. Free Certificate of Merit full-scale reading of a long, thin strip of conductive material arranged in a Wheatstone circuit. Not uniform and is cramped at the frequency at which Hey are to be used will in. And ultraviolet radiations of a long, thin strip the power needs of electrical transducer is mcq conductive material arranged in a Wheatstone circuit. Turbine and generator ratings 3 comments or just want to the power needs of electrical transducer is mcq hello: Copyright 2019 all rights.. Output can be used as a change in conductivity appears as a passive.! Transformer ( LVDT ) is achieved exact magnitude of the meter in weight change from an exterior power source their. All rights reserved to say hello: Copyright 2019 all rights reserved any particle. And comfortable distance from the hot source two the power needs of electrical transducer is mcq type of pyrometer are found in measuring the temperature low... To be measured into the voltage when they are subjected to mechanical forces or stress along specific.. The principle of variable resistance transducer is a strain gauge the frequency at which Hey are to be measured and... A safe and comfortable distance from the transducer element into the voltage of inductances over wide... Loss in the infrared, visible and ultraviolet radiations temperatures up to, strain... And can withstand mechanical shock and vibrations Verbal ability, and strain load. Of flow as well as the total radiation pyrometers are used in the infrared, and! As low as -250°C and below these temperature constant and manganin thermometers are used to measure power?...