Strain gauges typically require an excitation voltage and provide output sensitivity proportional to that excitation. This test is Rated positive by 91% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. This test is Rated positive by 85% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. The main purpose of a strain gauge is to indirectly determine stress and its variation with time, quantitatively. Change in stress is determined by multiplying the measured strain by the modulus of elasticity. It’s difficult to comprehend quite how much strain gauges affect your everyday life, either directly or indirectly. max Strain gauge is 350.7 Ohms, min strain gauge is 350 ohms Q1: What is the output of the voltage divider when the stain gauge is not flexed? Other bridge resistances are R1 = R2 = R3 = 300Ω . Optical type 3. Thirty Five MCQ’s on Stress AND Strain Question.1. In measurements using two strain gauges, the purpose of dummy strain gauge is I'd like to try one out myself, but I can't justify the cost. In addition to standard strain gauges, HBM also supplies a selection of strain gauge rosettes. I just want to know how to connect three wired strain gauge (TML strain gauge, type FLA-5-11, Tokyo Sokki Kenkyujo Co., Ltd.) with Agilent 34901a 20 channels multiplexer. Stress is (a)External force (b)Internal resistive force (c)Axial force (d)Radial force (Ans:b) 2. The three types of bonded strain gauges are 1. Some strain gauges called strain gauge rosettes use additional sensors to provide strain measurements in multiple directions. Strain gauges are typically used in stress analysis and force or torque transducer applications. strain gauge configuration where one gauge is active (R G + ∆R), and a second gauge is placed transverse to the applied strain. The three measuring grids are arranged at an angle of 0o/45o/90o for types RY1, RY3, RY8, RY9, and RY10, or 0o/60o/120o for types RY4 and RY7. fscl vinyl addict Posts: 8071 Joined: 05 Aug 2004 07:51 Location: CT, US. Polyimide is the prevalent backing material, and is thus the default standard. Some of them are as follows: 1. The RY strain gauge rosettes have three measuring grids for analyzing biaxial stress states with unknown principle directions. A strain gage’s electrical resistance varies in proportion to the amount of strain in the device. 80 views 1 answer. Q1) The detectors used in optical sensors is. Strain gauge based measurements can be installed on almost any material for verifying mechanical design component strength to structural monitoring of critical infrastructure. The value of ΔR will be "A strain gage (sometimes referred to as a Strain gauge) is a sensor whose resistance varies with applied force; It converts force, pressure, tension, weight, etc., into a change in electrical resistance which can then be measured. Description of the Unbonded Strain gauges: The arrangement of an unbonded strain gauges consists of the following. The change in resistance is measured in terms of either load or displacement.It basically measures strain on the application of stress. MCQ ON DISPLACEMENT MEASUREMENT,STRAIN MEASUREMENT,MEASUREMENT OF ANGULAR VELOCITY,ACCELERATION MEASUREMENT. Strain gauge and rosettes Introduction A strain gauge is a device which is used to measure strain (deformation) on an object subjected to forces. Mechanics of Solids MCQ question on Simple Stress and Strain 1. When external forces are applied to a stationary object, stress and strain are the result. Backing (carrier) materials are needed, because strain gage wires are very fragile and difficult to handle. 0 like 0 dislike. Bonded Strain Gauges These gauges are directly bonded (that is pasted) on the surface of the structure under study. [2 Ω] [3 Ω] [4 Ω] [1 Ω] 7 people answered this MCQ question 1 Ω is the answer among 2 Ω,3 Ω,4 Ω,1 Ω for the mcq In a resistance strain gauge, G = 2, stress = 1050 kg/cm2, R = 1000 Ω. etc. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Therefore, the strain has little effect on the second gauge, called the dummy gauge. asked Mar 20, 2018 by anonymous. Jan 02,2021 - Thin Cylinder, Thick Cylinder - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. As said, only you can judge. Semi-conductor gauge Fine wire strain gauge This is the first type of Bonded Strain Gauges. The complete strain state is composed of normal, shear, and principal strains. Mechanical type, 2. Metal foil strain gauge 3. These strain gauges are typically used as elements in a Wheatstone bridge circuit, which is used to make the measurement. The gauge is attached to the object by a suitable adhesive, such as cyanoacrylate. Semiconductor strain gauges made of silicon have a gauge factor about 70 to 100 times higher and are therefore much more sensitive than metallic wire strain gauges. Change in stress is determined by multiplying the measured strain by the modulus of elasticity. Strain gauges convert the applied force, pressure, torque, ect., into an electrical signal which can be measured. Q2) Optical sensors used for the displacement measurement works on the principal that . Example Problem 10.8. (10.6) and (10.11) to obtain. Combine Eqs. Dummy strain gauges are used for : - a) compensation of temperature changes b) increasing the sensitivity of bridge in which they are included c) compensating for different expansion d) calibration of strain gauge. Re: Strain Gauge Cartridges -- Real or Rip? a. Photodiodes. Strain gauge directly is used for the measurement of load and indirectly it is used for the measurement of displacement. A strain gauge forms one arm of the bridge shown in the figure below and has a nominal resistance without any load as Rs = 300Ω . A biaxial rosette uses two sensors and the strain gauges are mounted perpendicular to each other. Strain can be measured using various types of devices classified depending upon their principle of operation. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. Following are the basic types of stress except (a)Tensile stress (b)Compressive stress (c)Shear stress (d)Volumetric stress (Ans:d) 3. Hence they are termed as unbounded strain gauges. If it's half the cost of a SS strain gauge setup, is the sonic improvement worth it at twice the price? asked Jun 29 by anonymous. 0 like 0 dislike. Then the voltage measurement is gathered using data acquisition. The ability of the material to deform without breaking is called (a) Elasticity (b) … Continued Strain Gauges are important geotechnical tools that measure strain in underground cavities, tunnels, buildings, concrete, masonry dams, bridges, embedment in soil/concrete. Today you have already seen a strain gauge in operation or used a product that used strain gauges during its development. Strain Gauge Rosettes from HBM. Top. (0.025 mm) thickness, bonded directly to the strained surface by a thin layer of epoxy resin. 4 strain gauges are installed on one side of the structure as a full bridge + Temperature effects are well compensated + High output signal and excellent common mode rejection (CMR) - Normal and bending strain cannot be separated (superimposed bending) 7 Strain measurement on a tension/ compression bar . The main purpose of a strain gauge is to indirectly determine stress and its variation with time, quantitatively. Force causes strain, which is then measured with the strain gauge by way of a change in electrical resistance. The metallic strain gage consists of a very fine wire or, more commonly, metallic foil arranged in a grid pattern. A.Horizontal direction only B.Vertical direction only C.Complex parts Related posts: Strain rosettes are generally used for_____? Q2: What is the output of the voltage divider when the stain gauge is at its maximum? The metallic foil-type strain gauge consists of a grid of wire filament (a resistor) of approximately 0.001 in. b. Phototransistors. The deformation per unit length is called (a) Strain (b) Stress (c) Elasticity (d) None of these Question.2. Two frames P and Q carrying rigidly fixed insulated pins as shown in diagram. However, it is done in of two stages. Ultraconformable strain gauge can be applied directly to human skin for continuous motion activity monitoring, which has seen widespread application in interactive robotics, human motion detection, personal health monitoring, and therapeutics. Strain gauges may be purchased as complete units, with both strain gauge elements and bridge resistors in one housing, sealed and encapsulated for protection from the elements, and equipped with mechanical fastening points for attachment to a machine or structure. Calculate the strain in a metal wire gauge for a fractional change in resistance of 10 percent. The rosettes are used to determine the complete strain state of an object at the surface. A strain gauge (also spelled strain gage) is a device used to measure strain on an object. 39 views 1 answer. Intensity of light increases with … Gauge sensitivity A second basic characteristic of a strain gage is its sensitivity .Sensitivity is the smallest value of strain which can be read on the scale associated with the strain gage. d. Only (a) and (b) e. All the above. c. Laser. The maximum permissible current through the strain gauge is 20 mA. Pneumatic type 4. You can measure strain using several methods, but the most common is with a strain gage. A strain gauge with high sensitivity and high gauge factor is Which of the following statement is correct? Hence they are termed as bonded strain gauges. Such a package is typically called a load cell. However, any changes in temperature will affect both gauges in the same way. Bonded Foil strain gauges The first bonded, metallic wire-type strain gauge was developed in 1938. Solution . Oil switches are employed for? Strain gauge is used for measuring strain generated in a member, due to applied load. Fine wire strain gauge 2. load cells/force … etc. Definition: Strain gauge is a device which is when subjected to some force results change in resistance of the material. For strain gauge devices, strain gauges (strain-sensitive variable resistors) are bonded to parts of the structure that deform when making the measurement. a. How is strain measured? These strain gauges are not directly bonded onto the surface of the structure under study. The device speed is a) 60 r.p.s b) 1800 r.p.s c) 3600 r.p.s d) 7200 r.p.s 12) The gauge factor of the material of strain gauge is such that the resistance changes from 1000 ohms to 1009 ohms when subjected to ... Read more Measurements & Instrumentation MCQ ECE Questions Answers In all cases, carefully and 11) A variable reluctance type tachometer has 60 rotor teeth, the records 3600 counts/minutes. You may have weighed yourself, had some food, used your mobile phone, or travelled to work; all examples of where they have been used. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. There is no direct method for measurement of strain and stress. The backing is usually made of a dielectric (usually plastic) which provides a good electrical insulation between the wires of the strain gage and the specimen. Strain gauges serve either to directly measure the static (0 to a few Hz) or dynamic (up to several kHz) elongations, compressions or torsions of a body by being directly fixed to it, or to measure various forces or movements as part of a sensor (e.g. The most widely used strain gage is the bonded metallic strain gage. Diagonal bridge with dummy gauges. Dec 31,2020 - Stress And Strain - MCQ Test 2 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. Strain Gauges are an important geotechnical tools that measure strain in underground cavities, tunnels, buildings, concrete, masonry dams, bridges, embedment in soil/concrete. Is an online portal for the measurement of load and indirectly it is used for the measurement, which then... Sensors to provide strain measurements in multiple directions the measurement of strain gauge is 20 mA strain! 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