7. From Figure 7.4 Spring force It is relatively cheap and is commonly used for measuring the gauge pressure of both gaseous and liquid fluids. Mechanical Engineering MCQ questions and answers especially for the Mechanical Engineer and who preparing for GATE Exam. Download our mobile app and study on-the-go. (ii.) The considerations provided in the paper indicate certain flaws and simplifications resulting from the fact that damping characteristics are assumed as the function of input velocity only, which is the case of simulation studies. The other end of the tube is fixed to a socket where the pressure to be measured is applied. To provide an electrical reference for various sections of the device. Multiple-Choice Questions 1. Most pressure measuring devices use elastic members for sensing pressure at the primary stage. a) Tensile strain gauges Most of the time, primary sensing elements in local indicators or in electronic transmitters are elastic pressure sensors. Diaphragm element can also be used for force measurement. b) Used for measuring large forces Force application causes deformation or deflection on these elastic elements wherein the movement is then sensed by the strain gauge. b) False 11.6.3 Internal Forces. Fig. There are three types of Bourdon elements and they are: b) False Many force transducers employ simple elastic elements or a combination of elements, such as pillars, beams and rings, in assembled constructions. The types of pressure sensors are differentiated according to the amount of differential pressure they are able to measure. Elastic type pressure gauges are also used for pressure measurement up to 700 MPa. Which of the following quantities cannot be measured by a load cell? The components are active and passive components, sensors, transducers, transmitters, receivers, modules (WiFi, Bluetooth, GSM, RFID, GPS), and so on. These are: (i.) (i.) c) Used for measuring dynamic forces A strain gauge rosette is a term for an arrangement of two or more strain gauges that are positioned closely to measure strains along different directions of the component under evaluation. All low level electrical circuits need some form of grounding for one or both of the following reasons: Chassis ground connection to the shielding enclosure within which the circuitry is mounted. add if forces are applied in the same direction, subtract if forces are applied in opposite directions. The Bourdon tube (invented by Eugene Bourdon, 1808–84) ( Fig 3.10 ) and the diaphragm ( Fig 3.11 ) … There are three main types of pressure elements. ANSWER : A. Which of the following device can be used for force measurement? inertia. C)the units used to measure price but not the units used to measure quantity. You must be logged in to read the answer. The instrument used to measure force is called a dynamometer. Which of the following statement is true for force? It's the best way to discover useful content. d) None of the mentioned d) Bourdon tube An elastic-type pressure gauge is a type of pressure gauge that measures the pressure by balancing the pressure of the fluid with the force of deformation of an elastic solid. D)neither the units used to measure price nor the units used to measure quantity. These short solved questions or quizzes are provided by Gkseries. View Answer, 9. c) Force is a dimensionless quantity a measure of the force of gravity on an object. A period of rapid population growth between a preindustrial, stable population characterized by high birth and death rates and a later, modern, stable population marked by low fertility and mortality is known as Sensors are sophisticated devices that are frequently used to detect and respond to electrical or optical signals. In a capacitance-type pressure sensor, a high-frequency, high-voltage oscillator is used to charge the sensing electrode elements. Chapter 3: Types of Elastic Element or Spring Material. Consider, for example, a situation is in which a periodic measurement with frequency fm is being measured with an instrument as shown in the figure. Within an electronic load cell, the gravitational force on the body being measured is applied to an elastic element. As shown in fig. Data is transmitted in the form of light.It is used for measuring displacement,torsion. a) True View Answer. Force is a vector quantity—that is, it has both magnitude (size) and direction. Find answer to specific questions by searching them here. momentum. Low sensitivity and fast response if they are stiff c. Low sensitivity and slow response if they are stiff d. None of the above . B)the units used to measure price and the units used to measure quantity. Pressure gauges using Bourdon tube find wide applications because of their simple design and low cost, and are most commonly used for local indications and for signal transmission to remote locations. The system then needs an analog to digital converter to change the sensed data from analog to digital form. d) Slowly moving weights If now, a low pass filter is introduced between the amplification and recording stages, the high frequency noise signals will be eliminated & only the correct low frequency signals corresponding to the measured will reach the presentation stage of the instrument. b) Small weight Mechanical Engineering MCQ questions and answers for an engineering student to practice, GATE exam, interview, competitive examination and entrance exam. C type As a special case, silver diaphragms can be used to measure the pressure of chlorine, fluorine, and other halogens in their elemental state. When this data in the analog form is required to be fed to modern computer based data handling and control systems it is necessary to convert this data in discrete steps called bits. The sensor/transducer stage of the instrument produces a signal which is of the same form as the measured parameter but the instrument also picks up from surrounding noise signals with a higher frequency fn. a measure of how much matter is in an object. Tantalum also is used for highly corrosive, high temperature applications. Load cells are used for measuring _______________ View Answer, 4. The movement of the tip is ideally proportional to the pressure applied. a) Force is a scalar quantity Conversion is the context of measuring instruments refers to conversion from analog to digital output or vice versa converter. c) Weights moving in high speed These instruments are used for a wide range of tasks including measuring the power of an engine, measuring the grip strength of a person and studying combustion. The signals given by a transducer may be nonlinear in nature or may contain noise. For these processes the transducer signal is superimposed on a high frequency wave form called carrier in such a way that it is impossible later to recover & display the original signal. As a special case, silver diaphragms can be used to measure the pressure of chlorine, fluorine, and other halogens in their elemental state. Which of the following arrangements are used in load cells? These short objective type questions with answers are very important for Board exams as well as competitive exams. The spoken work is first converted into digital form by using a technique called Pulse Mode Modulation for transmission over telephone lines & then converted back into analog form at the receiving end. The tube which is oval in section is formed into an arc of 250˚ & hence the name is C. One end called the tip of the tube is sealed and is called free end, is attached by a light link-work to a mechanism which operates the pointer. Mechanical pressure-sensing elements include the bellows, the diaphragm, and the bourdon tube. a) Large weight The filter allows a band of frequencies known as pass band to pass through while ideally all the remaining frequencies called attenuation band are filtered out. As the name "spring element" suggests, the steel is slightly deformed under load, but then returns to its starting position, responding elastically to every load. Hence it is very difficult to tell the measurement taken from an elastic tape. These elastic members are of many types and convert the pressure into mechanical displacement which is later converted into an electrical form using a secondary transducer. In this case the grounding process does not involve earth at all. These are: Most pressure measuring devices use elastic members for sensing pressure at the primary stage. 10. grounding can be of two types. Force is measured using a force meter. gives a schematic representation of the modulation/demodulation process. the unit of force is the dyne (the force exerted by one gram under the influence of gravity), and the unit of area is the square centimeter. Tantalum also is used for highly corrosive, high temperature applications. Pointer, P, was used to read the scale. A sensor converts the physical parameter (for example: temperature, blood pressure, humidity, speed, etc.) Thus before sending these signals to the system it is essential to remove the noise, non linearity associated with the raw output from a sensor or a transducer. Strain Gauge is a passive transducer that converts a mechanical elongation or displacement produced due to a force into its corresponding change in resistance R, inductance L, or capacitance C. A strain gauge is basically used to measure the strain in a work piece. Bourdon tube (ii.) Work measurement has been defined by British Standard Institution as, “The application of techniques designed to establish the time for a qualified worker to carry out a specified job at a defined level of performance”.This time is called standard or allowed time. a) Force to strain Atomic force microscopy (AFM) is widely used for measuring the elasticity of living cells yielding values ranging from 100 Pa to 100 kPa, much larger than those obtained using bead-tracking microrheology or micropipette aspiration (100–500 Pa). Anderson Bridge is used to measure: a) L b) C c) V d) I. 15.6 Bourdon Tube. weight. Substances that display a high degree of elasticity are termed "elastic." Bellows (iii.) Load cells are primary transducers. All Rights Reserved. 1. The unit of measurement for force is the newton, symbolized by the letter N and named in honor of the English physicist Isaac Newton. d) None of the mentioned Illustrate the working principle of any one in details. A period of rapid population growth between a preindustrial, stable population characterized by high birth and death rates and a later, modern, stable population marked by low fertility and mortality is known as The measured pressure pushes on an elastic element and the resulting deformation enables production of a signal proportional to the pressure. If unrestrained, the natural elastic properties of the element will produce a motion proportional to the applied pressure. Work measurement has been defined by British Standard Institution as, “The application of techniques designed to establish the time for a qualified worker to carry out a specified job at a defined level of performance”.This time is called standard or allowed time. Helical type. For low differential pressure measurement Liquid Column Manometers are used. Fiber optic cable consists of outer core and inner cladding. d) None of the mentioned A dynamometer is capable of measuring different kinds of force such as mechanical force and muscular force. The SI unit applied to elasticity is the pascal (Pa), which is used to measure the modulus of deformation and elastic limit. 10. This strain (positive or negative) is converted into an electrical signal by a strain gauge (SG) installed on the spring element. – A damper element is used to model a device designed into a system (e.g., automotive shock absorbers) or for unavoidable parasitic effects (e.g., air drag). Which of the following is not a type of pressure sensing element? Participate in the Sanfoundry Certification contest to get free Certificate of Merit. calculating force. – To be an energy-dissipating effect, a device must exert a force opposite to the velocity; power is always negative when the force and velocity have opposite directions. 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Question 1. Elasticity is a physical property of a material whereby the material returns to its original shape after having been stretched out or altered by force. The process of superimposition of the original signal on the carrier is shown as modulation while the subsequent process of recovering the original signal is called demodulation. Answer : D. Question 2. the product of an object's mass and velocity. If unrestrained, the natural elastic properties of the element will produce a motion proportional to the applied pressure. Micromachined force or tactile sensors using nickel–chromium piezoresistors with k = 5.2 are presented in [10]. b) Force to displacement a) True Rahul Kala, in On-Road Intelligent Vehicles, 2016. Go ahead and login, it'll take only a minute. In a capacitance-type pressure sensor, a high-frequency, high-voltage oscillator is used to charge the sensing electrode elements. Diaphragm. This leads to a distorted final display of the measured. In Imperial units, stiffness is typically measured in pounds(lbs) per inch.. Generally speaking, deflections (or motions) of an infinitesimal element (which is viewed as a point) in an elastic body can occur along multiple DOF (maximum of six DOF at a point). ... an elastic force that stretches or pulls on the molecules in matter. View Answer, 8. When we express measurement taken with elastic tape, we have to tell whether the tape was stretched. d) (1.08 F )/(E b t2) Ballastic tests are used in magnetic measurements for the determination of: a) Flux density of the specimen b) B-H curve of the specimen c) Hysteresis loop of the specimen d) All the above. The Bourdon tube is also an elastic-element type of pressure transducer. You'll get subjects, question papers, their solution, syllabus - All in one app. Give two examples of periodic motion. a) Used for measuring small forces b) Force is a vector quantity During a measurement, weight acts on the load cell’s metal spring element and causes elastic deformation.. View Answer, 5. © 2011-2020 Sanfoundry. Each of these devices converts a fluid pressure into a force. Thus, activities are carried out by using signal conditioning devices and the process is termed ‘. Dyne per square centimeter is one hundred-thousandth ( 10−5 ) of a signal to... Matter is squeezed or pushed together for aircraft and space craft circuitry the other end of following... Occurs when matter is pulled or stretched very high pressures up to about 700MN/m^2 high of... Element can also be used for highly corrosive, high temperature applications and measured a vertical displacement and a relative. Measurement Liquid Column Manometers are used in load cells undeformed axis stage of the following device can be used measurement... True for force hundred-thousandth ( 10−5 ) of a signal proportional to the direction the... As well as to compensate for wear which may develop over the,. Nor the units used to measure large force ; measure several thousand “ g Characteristics... Force … 10 10 ] also minimally elastic. is fixed to a socket where the measurement. Find Answer to specific questions by searching them here practice all areas of Instrumentation transducers Multiple Choice questions Answers! To sense the i… the spring element is usually made of steel or.. Go ahead and login, it has both magnitude ( size ) and.! And is commonly used for measurement of very high pressures up to about 700MN/m^2 sizes,,. Is termed as ‘ signal conditioning devices and the resulting deformation enables production of a sewing machine contain noise processing! Transducers used for measurement of a pascal measuring devices use elastic members for sensing pressure at the primary.... Consists of outer core and inner cladding may develop over the time, primary sensing elements in local indicators in! Measurement Multiple Choice questions and Answers especially for the mechanical Engineer and who preparing for Exam. Are also used for the use of A/D & D/A converter for the use of A/D & D/A for... The amount of differential pressure measurement up to about 700MN/m^2 Certification contest to get free Certificate of Merit refers! Set of Instrumentation transducers Multiple Choice questions & Answers ( Mcqs ) focuses on ” force measurement mechanical. Elastic elements or mechanical type of transducers are used in load cells to. Process is termed as ‘ signal conditioning devices and the Bourdon tube sensed by strain! Way to discover useful content seen directly, their effects can be observed and measured pan apply... A point on a horizontal beam can undergo both a vertical displacement and a relative... Assembled constructions leads to a distorted final display of the following statement is for... Response if they are stiff c. low sensitivity and slow response if they are: (.! Transducers, here is complete set of 1000+ Multiple Choice questions & Answers ( Mcqs ) focuses on ” measurement! Most of the following is not a type of pressure transducer elastic-element type of pressure.! Leads to a distorted final display of the element will produce a motion proportional to applied.