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Project plan  The purpose of the present report is to design an electromagnetic brake for a given braking torque and speed, validate it...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/fabrication-of-electro-magnetic-brake-report-download/" aria-label="View Post: Fabrication Of Electro Magnetic Brake report Download">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Fabrication Of Electro Magnetic Brake report Download","url":"\/\/www.gunkrazy.com\/fabrication-of-electro-magnetic-brake-report-download\/","articleBody":"Fabrication Of Electro Magnetic Brake report Download\r\nProject plan\r\n\r\nThe purpose of the present report is to design an electromagnetic brake for a given braking torque and speed, validate it experimentally, provide a conceptual design, and study its integration in automobiles. \r\n\r\nThe project plan is decomposed as follows:\r\n- Theoretical analysis: An analytical model is derived for the electromagnetic brake and its fundamental physics are investigated. The model provides a preliminary sizing of the brake and critical information about the sensitivity to design parameters.\r\n- Experimental validation: A test bed has been built based on specifications from numerical data calculated and data has been gathered and compared to the numerical analysis data. The objective is to validate the accuracy of numerical analysis and to explain potential divergences. This validation is necessary to establish the ability of numerical analysis to model electromagnetic brakes.\r\n- Expansion of the concept: Several additional innovations are analyzed and incorporated in the integrated brake in order to make the concept more complete and more relevant to real world applications.\r\n- Integration study: The use of the integrated brake in conventional and hybrid automobiles is investigated. Specifications for the respective sizing of the friction, regenerative and eddy-current brake are derived through an optimization study and the gains achieved are analyzed.\r\n\r\nIntroduction\r\n\r\nElectromagnetic brakes have been used as supplementary retardation equipment in addition to the regular friction brakes on heavy vehicles. The working principle and characteristics of electromagnetic brakes are given below.\r\n\r\nGeneral Principle of Brake System\r\n\r\nThe principle of braking in road vehicles involves the conversion of kinetic energy into thermal energy (heat). When stepping on the brakes, the driver commands a stopping force several times as powerful as the force that puts the car in motion and dissipates the associated kinetic energy as heat. Brakes must be able to arrest the speed of a vehicle in short periods of time regardless how fast the speed is. As a result, the brakes are required to have the ability to generating high torque and absorbing energy at extremely high rates for short periods of time. Brakes may be applied for a prolonged periods of time in some applications such as a heavy vehicle descending a long gradient at high speed. Brakes have to have the mechanism to keep the heat absorption capability for prolonged periods of time.\r\n\r\nWorking Principle\r\n\r\nThe working principle of the electric retarder is based on the creation of eddy currents within a metal disc rotating between two electromagnets, which sets up a force opposing the rotation of the disc. If the electromagnet is not energized, the rotation of the disc is free and accelerates uniformly under the action of the weight to which its shaft is connected. When the electromagnet is energized, the rotation of the disc is retarded and the energy absorbed appears as heating of the disc. If the current exciting the electromagnet is varied by a rheostat, the braking torque varies in direct\r\nproportion to the value of the current. It was the Frenchman Raoul Sarazin who made the first vehicle application of eddy current brakes. The development of this invention began when the French company Telma, associated with Raoul Sarazin, developed and marketed several generations of electric brakes based on the functioning principles described above (Reverdin, 1974).\r\n\r\nelectromagnetic brake\r\n\r\nA typical retarder consists of stator and rotor. The stator holds 16 induction coils, energized separately in groups of four. The coils are made up of varnished aluminum wire mounded in epoxy resin. The stator assembly is supported resiliently through anti-vibration mountings on the chassis frame of the vehicle. The rotor is made up of two discs, which provide the braking force when subject to the electromagnetic influence when the coils are excited. Careful design of the fins, which are integral to the disc, permit independent cooling of the arrangement.\r\nDownload Report :\r\nFabrication Of Electro Magnetic Brake report PDF Download\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nProject Sample report , Final report Download\r\nSimple , Easy mechanical projectsManually Hand Operated projectsAffordable low budget ProjectsMini low cost Projects\r\nAutomobile Engineering Projects List - Abstract , Report\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Fabrication Of Electro Magnetic Brake report Download","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-20","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/electromagnetic-brake-300x173.jpg","height":173,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/fabrication-of-pneumatic-punching-riveting-machine/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/pneumatic-shearing-and-reviting-machine-mechanical-projects-257x300.jpg')"></div><span class="sr-only">link to Fabrication of Pneumatic Punching and Riveting Machine Report</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/fabrication-of-pneumatic-punching-riveting-machine/">Fabrication of Pneumatic Punching and Riveting Machine Report</a></p></header><div class="excerpt"><p>Fabrication of Pneumatic Punching and Riveting Machine Report Download 
ABSTRACT  In our Project work “FABRICATION OF PNEUMATIC CONTROLLED RIVETTING AND PUNCHING MACHINE” we used principles...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/fabrication-of-pneumatic-punching-riveting-machine/" aria-label="View Post: Fabrication of Pneumatic Punching and Riveting Machine Report">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Fabrication of Pneumatic Punching and Riveting Machine Report","url":"\/\/www.gunkrazy.com\/fabrication-of-pneumatic-punching-riveting-machine\/","articleBody":"Fabrication of Pneumatic Punching and Riveting Machine Report Download\u00a0\r\nABSTRACT\r\n\r\nIn our Project work \u201cFABRICATION OF PNEUMATIC CONTROLLED RIVETTING AND PUNCHING MACHINE\u201d we used principles of Pneumatic control system in developing this project work., In our project we are having two control switches, when first switch is pressed it works as a Riveting machine and when the second switch is pressed it works as Punching machine. The vibrating mechanism is a chieved by reciprocating the double acting cylinders, which controlled by solenoid operated 5\/2 way DC valve which is actuated through the control system.\r\nThe operating pressure required for this system is 5 to 6 bar. The maintenance required for this system is less than the other systems.\r\nFor punching operation, a counter weight is added to the pneumatic cylinder force in order to make the punching operation effectively, and also for punching operation a separate Punching tool is fitted and the job is placed on the die, For riveting operation a riveting head\r\nis fitted.\r\n\r\nINTRODUCTION\r\n\r\nThe press is the punching and riveting machine tool designed to punch letter or rivet metal by applying mechanical force or pressure. The metal is punched or riveted to the desired requirement. The presses are exclusively intended for mass production and they represent the fastest and more efficient way to form a metal into a finished punched or riveted product.\r\nPress tools are used to form and cut thin metals. Press tools operation can be simplified to a few simple operations involving a punch a die. There are Nemours types of presses in engineering field, which are used to fulfil the requirements. We are interested to introduce pneumatic system in presses. The main function of pneumatic press is to form or cut thin sheet metals or non metals using pneumatic power. In this project we have used to punching process and riveting process for simple application.\r\nWORKING PRINCIPLE:\r\nCompressed air from a compressor is used to press the work by means of the piston and piston rod, cylinder through a lever. The high pressurized air striking against the piston tends to push it upwards. This force is transmitted to a punch by means of a lever by its\r\nmechanical advantage. The punch forced downward pierces the work material. This is the main principle of the unit.\r\nWORKING\r\nThe compressed air from the compressor at the pressure of 5 to 7 bar is passed through a pipe connected to the Solenoid valve with one input. The Solenoid Valve is actuated with Control Timing Unit. The Solenoid valve has two outputs and one input. The air entering into\r\nthe input goes out through the two outputs when the timing control unit is actuated. Due to the high air pressure at the bottom of the piston, the air pressure below the piston is more than the pressure above the piston. So these moves the piston rod upwards which move up the\r\neffort are, which is pivoted by control unit. This force acting is passed on to punch which also moves downwards.\r\n\r\npneumatic shearing and riveting machine - mechanical projects\r\n\r\nThe punch is guided by a punch guide who is fixed such that the punch is clearly guided to the die. The materials are in between the punch and die. So as the punch comes down the materials are sheared to the required profile of the punch and the blank is moved downwards\r\nthrough the die clearance. Pneumatic systems require air to operate successfully. As a result of air being extremely abundant, and free, it is easy to restock the system. Safety: As a result of pneumatic systems running on air, safety hazards are significantly reduced. There are\r\nlimited occurrences of fires because air is non-flammable, and leakages in the system do not negatively effect the outside environment.\r\n\r\nTOOLS USED IN PROJECT:\r\n\r\nWelding Machine\r\nScrew driver\r\nSpanner\r\nSoldering Rod\r\nSoldering flux\r\nCutter\r\nLathe\r\nKnurling Tool\r\nTapper Tool\r\nAxe Frame\r\n\r\nCONCLUSION:\r\n\r\nThe pneumatic punching and riveting has been successfully completed with fullest satisfaction. We are optimistic based on the revolution, the machine is going to make in the pressing field. This project may be further developed into a unit with an automatic material\r\nhandling system.\r\n\r\n\r\nDownload Report :\r\nFabrication of Pneumatic Punching and Riveting Machine Report PDF Download\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nProject Sample report , Final report Download\r\nPneumatic or Air operated projects\r\nHydraulic and Pneumatic Projects List - Abstract , Report Download\r\nSimple , Easy mechanical projectsManually Hand Operated projectsAffordable low budget ProjectsMini low cost Projects\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Fabrication of Pneumatic Punching and Riveting Machine Report","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-19","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/pneumatic-shearing-and-reviting-machine-mechanical-projects-257x300.jpg","height":300,"width":257},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/pneumatic-paper-cutting-machine-report-mechanical-projects/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/Pneumatic-paper-cutting-machine-300x227.jpg')"></div><span class="sr-only">link to Pneumatic Paper Cutting Machine Report &#8211; Mechanical projects</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/pneumatic-paper-cutting-machine-report-mechanical-projects/">Pneumatic Paper Cutting Machine Report &#8211; Mechanical projects</a></p></header><div class="excerpt"><p>Pneumatic Paper Cutting Machine Report - Mechanical projects
SYNOPSIS  The object of this project is to develop a Paper cutting machine to count the paper. The operation of paper cutting machine...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/pneumatic-paper-cutting-machine-report-mechanical-projects/" aria-label="View Post: Pneumatic Paper Cutting Machine Report &#8211; Mechanical projects">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Pneumatic Paper Cutting Machine Report &#8211; Mechanical projects","url":"\/\/www.gunkrazy.com\/pneumatic-paper-cutting-machine-report-mechanical-projects\/","articleBody":"Pneumatic Paper Cutting Machine Report - Mechanical projects\r\nSYNOPSIS\r\n\r\nThe object of this project is to develop a Paper cutting machine to count the paper. The operation of paper cutting machine is performed by using a D.C Motor, Paper feed Mechanism, counting proximate Sensors and Presettable timer. The paper is held at a paper tray, one end of which is passed through three guide-rollers. The Electronic Counter is used to counting the number of paper transferred to the collecting tray. The number of papers transferred to the collecting tray is adjusted by resetting the Electronic counter.\r\nINTRODUCTION\r\nThe number of papers that are counted can be directly read on the Resettable count meter fixed to the frame stand. The paper cutting machine can be operated by using a permanent Magnet D.C motor. The machine is useful to count papers very accurately. The advantage of the machine is that it is portable and low cost machine\r\n\r\nThe advantages of Automations are\r\n\r\n\u2022 Reduction of lab our and material cost\r\n\u2022 Reduction of overall cost\r\n\u2022 Increased production\r\n\u2022 Increased storage capacity\r\n\u2022 Increased safety\r\n\u2022 Reduction in fatigue\r\n\u2022 Improved personnel comfort\r\n\r\nAPPLICATIONS\r\n\r\n\u2022 It is very useful in all office accounts department.\r\n\u2022 It is also useful in printing, Xerox Machine\r\n\r\n Pneumatic paper cutting machine\r\n\r\nDouble Acting Cylinder\r\n\r\nIn this the force exerted by the compressed air moves the piston in two directions. They are used partially when the piston is required to perform work not only on the advance movement but also on the return stroke. This principle, the stroke length is unlimited, although bucking and bending must be considered before selecting the particular size of piston diameter, rod length and stroke length.\r\n\r\nSolenoid Valve\r\n\r\nSolenoids may be push type or pull type. The push type solenoid is one in which the plunger is pushed when the solenoid is energized electrically. The pull type solenoid is one is which the plunger is pulled when the solenoid is energized. The name of the parts of the solenoid should be learned so that they can be recognized when called upon to make repairs, to do service work or to install them.\r\n\r\nELECTRONIC CONTROL TIMING UNIT:- \r\n\r\nHere the 555 IC has been used as a multi vibrator. The output of IC 555 is fed to the input pin (pin no 14) of CD 4017 continues counting.\r\nThe output of the IC becomes available at pin Nos. 3, 2 and 4. The output pulse of any one of output pin triggers (Puts ON) the Triac and current starts flowing across the load connected. This process continues on other pins at different time intervals and the cycle continues. The frequency interval (Time) of the cycle can be adjusted by the pre-set look connected to pin 6 of 555 Timer IC.\r\nDownload Pdf Report\u00a0\r\nPneumatic Paper Cutting Machine Report - Mechanical projects\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nHydraulic and Pneumatic Projects List - Abstract , Report Download\r\nPneumatic or Air operated projects\r\nProject Sample report , Final report Download\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Pneumatic Paper Cutting Machine Report &#8211; Mechanical projects","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-17","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/Pneumatic-paper-cutting-machine-300x227.jpg","height":227,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/30-previous-years-barc-oges-interview-questions-for-mechanical/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/1200px-Bhabha_Atomic_Research_Centre.svg_-300x300.png')"></div><span class="sr-only">link to 30+ Previous Years BARC OGES interview Questions for Mechanical</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/30-previous-years-barc-oges-interview-questions-for-mechanical/">30+ Previous Years BARC OGES interview Questions for Mechanical</a></p></header><div class="excerpt"><p>30+ Previous Years BARC OGES interview Questions for Mechanical
In month Jan-feb of Every year Bhabha Atomic Research Centre (BARC) is conducted the written test for recruiting the young talented...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/30-previous-years-barc-oges-interview-questions-for-mechanical/" aria-label="View Post: 30+ Previous Years BARC OGES interview Questions for Mechanical">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"30+ Previous Years BARC OGES interview Questions for Mechanical","url":"\/\/www.gunkrazy.com\/30-previous-years-barc-oges-interview-questions-for-mechanical\/","articleBody":"30+ Previous Years BARC OGES interview Questions for Mechanical\r\nIn month Jan-feb of Every year Bhabha Atomic Research Centre (BARC) is conducted the written test for recruiting the young talented engineers for their Trainee Research Program. written test followed by High voltage Interview. They asked some highly conceptual questions in interview. so in order to make your preparation easy\r\n\r\nHere We are posting some Previous year Interview Questions. Many of students who is going to appear in the Interview can get general Idea from these questions.\r\n\r\nBRAC\r\nBARC PREVIOUS YEAR INTERVIEW QUESTIONS\r\n1. Draw Rankine Cycle and give its physical significance of every point.\r\n\r\n2. Why not we feed the steam from turbine to boiler? If lower line brought to y=0 then what is the efficiency and physical situation?\r\n\r\n3. Pascal's law and Pascal Paradox?\r\n\r\n4. SFD and BMD of all possible cases of loading\r\n\r\n5. Heat transfer between slabs having temp. gradient, temperature profile. Find thermal conductivity K. \r\nFind same thing for a cylinder case.\r\nmodification of temp. profile for both cases when there is heat generation too involved.\r\n\r\n6. Details on Thermal conductivity K , and Convection Coeft. h.\r\n\r\n7. Modes of Heat transfer? Which is 4th one.\r\n\r\n8. Design of shafts is not based on Shear forces. Why?\r\n\r\n9. Where to place a pump along vertical head line.\r\n\r\n10. Log. profile in heat exchanger? concave or Convex?\r\n\r\n11. While inflating a balloon P and V both are increasing. Violets Boiles law. Explain.\r\n\r\n12. True and Engg. strain.\r\n\r\n13. Stress-strain diagram. Very detailed knowledge reqd.\r\n\r\n14. Shear profile in a cross section of a beam.\r\n\r\n15. In pelton wheel turbine cup, both outward and inward speed are equal. explain.\r\n\r\n16. Cavitation, Water Hammer. Explain.\r\n\r\n17. Why wind speed is high in summer.\r\n\r\n18 Heat transfer on Horizontal and Vertical plates\r\n\r\n19. TEMA standards?\r\n\r\n20. Yield point of Al does not exist. How to decide?\r\n\r\n21. Pump and Compressor difference.\r\n\r\n22. Efficiency of Carnot cycle why not perfect?\r\n\r\n23. Explain PMMs.\r\n\r\n24. Questions from favourite papers (tell core conceptual papers).\r\n\r\n25. Design of air duct.\r\n\r\n26. Charles law , Boyle's law.\r\n\r\n27. If 2 cylinders connected by a pipe to allow the gases to diffuse, then draw the PV and TS diagrams of process.\r\n\r\n28. Why we opt PV in some cases while TS diagrams in others?\r\n\r\n29. Draft Tube?\r\n\r\n30. Acceln.-time graph and Velo. time graph interconversion. Questions from Kinematics.\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nMechanical MCQ Objectives Question and Answers\r\nTechnical Mechanical Interview Question and Answers\r\n\r\n\r\n\r\n&nbsp;","headline":"30+ Previous Years BARC OGES interview Questions for Mechanical","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-14","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/1200px-Bhabha_Atomic_Research_Centre.svg_-300x300.png","height":300,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/machine-design-mcq-objective-question-answers-part3/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/06/castle-nut-300x258.jpg')"></div><span class="sr-only">link to Machine Design MCQ Objective Question and Answers Part 3</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/machine-design-mcq-objective-question-answers-part3/">Machine Design MCQ Objective Question and Answers Part 3</a></p></header><div class="excerpt"><p>Machine Design MCQ Objective Question and Answers Part 3 
Machine Design Multiple choice Objective Question useful for technical Aptitude test.  Machine Design MCQ : Part 1 | Part 2 | Part 3...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/machine-design-mcq-objective-question-answers-part3/" aria-label="View Post: Machine Design MCQ Objective Question and Answers Part 3">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Machine Design MCQ Objective Question and Answers Part 3","url":"\/\/www.gunkrazy.com\/machine-design-mcq-objective-question-answers-part3\/","articleBody":"Machine Design MCQ Objective Question and Answers Part 3\u00a0\r\nMachine Design Multiple choice Objective Question useful for technical Aptitude test.\r\n\r\n\r\n\r\nMachine Design MCQ : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n72.Buttress threads are usually found on\r\n(a) screw cutting lathes\r\n(b) feed mechanisms\r\n(c) spindles of bench vices\r\n(d) screw jack\r\n(e) railway carriage couplings.\r\nAns: e\r\n\r\n73. In order to obtain bolt of uniform strength\r\n(a) increase shank diameter\r\n(b) increase its length\r\n(c) drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread\r\n(d) tighten die bolt properly\r\n(e) all of the above.\r\nAns: c\r\n\r\n74. A key capable of tilting in a recess milled out in a shaft is known as\r\n(a) wood-ruff key\r\n(b) feather key\r\n(c) flat saddle key\r\n(d) gib head key\r\n(e) hollow saddle key.\r\nAns: a\r\n\r\n75. A key made from a cylindrical disc having segmental cross-section, is known as\r\n(a) wood-ruff key\r\n(b) feather key\r\n(c) flat saddle key\r\n(d) gib head key\r\n(e) hollow saddle key.\r\nAns: a\r\n\r\n76. A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as\r\n(a) wood-ruff key\r\n(b) feather key\r\n(c) flat saddle key\r\n(d) gib head key\r\n(e) hollow saddle key.\r\nAns: c\r\n\r\n77. Fibrous fracture occurs in\r\n(a) ductile material\r\n(b) brittle material\r\n(c) elastic material\r\n(d) hard material\r\n(e) all of the above.\r\nAns: a\r\n\r\n78. Turn buckle has\r\n(a) right hand threads on bout ends\r\n(b) left hand threads on both ends\r\n(c) left hand threads on one end and right hand threads on other end\r\n(d) no threads\r\n(e) threads in middle portion.\r\nAns: c\r\n\r\n79. Eye bolts are used for\r\n(a) foundation purposes\r\n(b) locking devices\u00a0\r\n(c) absorbing shock and vibrations\r\n(d) transmission of power\r\n(e) lifting and transportation of machines and cubicles.\r\nAns: e\r\n\r\n80. Elastic nut is a locking device in which\r\n(a) one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming\r\n(b) a slot is cut partly in middle of nut and then slot reduced by tightening a screw\r\n(c) hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip\r\n(d) through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end\r\n(e) none of the above,\r\nAns: c\r\n\r\n81. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation\r\n(a) 102 d\r\n(b) 124 d\r\n(c) 138 d\r\n(d) 151 d\r\n(e) 168 d.\r\nAns: e\r\n\r\n82. If threads on a bolt are left hand, threads on nut will be\r\n(a) right hand with same pitch\r\n(b) left hand with same pitch\r\n(c) could be left or right hand\r\n(d) right hand with fine pitch\r\n(e) left hand with fine pitch.\r\nAns: b\r\n\r\n83. Taper usually provided on cotter is\r\n(a) 1 in 5\r\n(b) 1 in 10\r\n(c) 1 in 24\r\n(d) 1 in 40\r\n(e) 1 in 50.\r\nAns: c\r\n\r\n84. Applications in which stresses are encountered in one direction only uses following type of threads\r\n(a) metric\r\n(b) buttress\r\n(c) acme\r\n(d) square\r\n(e) BSW.\r\nAns: b\r\n\r\n85. The draw of cotter need not exceed\r\n(a) 3 mm\r\n(b) 5 mm\r\n(c) 10 mm\r\n(d) 20 mm\r\n(e) 25 mm.\r\nAns: a\r\n\r\n86. A bench vice has following type of threads\r\n(a) metric\r\n(b) square\r\n(c) buttress\r\n(d) acme\r\n(e) BSW.\r\nAns: d\r\n\r\n87. The valve rod in a steam engine is connected to an eccentric rod by\r\n(a) cotter joint\r\n(b) bolted joint\r\n(c) kunckle joint\r\n(d) universal coupling\r\n(e) gib and cotter joint.\r\nAns: c\r\n\r\n88. Split nut is a locking device in which\r\n(a) one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming\r\n(b) a slot is cut partly in middle of nut and then slot reduced by tightening screw\r\n(c) a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip\r\n(d) through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end\r\n(e) none of the above.\r\nAns: b\r\n\r\n89. Taper on the cotter and slot is provided\r\n(a) on both the sides\r\n(b) on one side only\r\n(c) on none of the sides\r\n(d) may be provided anywhere\r\n(e) none of the above.\r\nAns: b\r\n\r\n90. The function of cutting oil when threading a pipe is to\r\n(a) provide cooling action\r\n(b) lubricate the dies\r\n(c) help remove chips\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n91. Silver-based solder is used for\r\n(a) flaring\r\n(b) brazing\r\n(c) soft soldering\r\n(d) fusion welding\r\n(e) none of the above.\r\nAns: b\r\n\r\n92. For tight leakage joints, following type of thread is best suited\r\n(a) metric\r\n(b) buttress\r\n(c) square\r\n(d) acme\r\n(e) NPT (national pipe threads).\r\nAns: e\r\n\r\n93. In order to permit the thermal expansion\/contraction of tubing, it should be\r\n(a) crimped\r\n(b) honed\r\n(c) flared\r\n(d) bent\r\n(e) none of the above.\r\nAns: d\r\n\r\n94. A tube has the following advantage over pipe\r\n(a) lighter and easier to handle\r\n(b) greater shock absorption\r\n(c) smoother inside walls\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n95. The strap end of a connecting rod of steam engine is joined by\r\n(a) gib of cotter joint\r\n(b) sleeve and cotter joint\r\n(c) spigot socket cotter joint\r\n(d) knuckle joint\r\n(e) universal coupling.\r\nAns: a\r\n\r\n96. A backing ring is used inside the pipe joint when making a\r\n(a) butt weld\r\n(b) fillet weld\r\n(c) sleeve weld\r\n(d) socket weld\r\n(e) tube weld.\r\nAns: a\r\n\r\n97. The shear plane in case of bolts should\r\n(a) be across threaded portion of shank\r\n(b) be parallel to axis of bolt\r\n(c)\u00a0 be normal to threaded portion of shank\r\n(d) never be across the threaded portion\r\n(e) none of the above.\r\nAns: d\r\n\r\n97. Castle nut is a locking device in which\r\n(a) one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming\r\n(b) a slot is cut partly is middle of nut and then slot reduced by tightening a screw\r\n(c) a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip\r\n(d) through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end\r\n(e) none of the above.\r\nAns: d\r\n\r\ncastle nut\r\n\r\n98. When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads\r\n(a) compression\r\n(b) tension\r\n(c) shear\r\n(d) combined loads\r\n(e) all of the above.\r\nAns: b\r\n\r\n99. Gear box is used\r\n(a) to produce torque\r\n(b) for speed reduction\r\n(c) to obtain variable speeds\r\n(d) to increase efficiency of system\r\n(e) to damp out vibrations.\r\nAns: c\r\n\r\n100. The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80\u00b0 for\r\n(a) reducing stress concentration\r\n(b) ease of manufacture\r\n(c) safety\r\n(d) fullering and caulking\r\n(e) all of the above.\r\nAns: d\r\n\r\n\r\n\r\nMachine Design MCQ : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nTechnical Mechanical Interview Question and Answers\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\n\r\n\r\n\r\n&nbsp;","headline":"Machine Design MCQ Objective Question and Answers Part 3","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-12","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/06\/castle-nut-300x258.jpg","height":258,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal no-thumb"><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/machine-design-mcq-objective-question-answer-part4/">Machine Design MCQ Objective Question and Answers Part 4</a></p></header><div class="excerpt"><p>Machine Design MCQ Objective Question and Answers Part 4 
Machine Design Multiple choice Objective Question useful for technical Aptitude test.  Machine Design MCQ : Part 1 | Part 2 | Part 3...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/machine-design-mcq-objective-question-answer-part4/" aria-label="View Post: Machine Design MCQ Objective Question and Answers Part 4">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Machine Design MCQ Objective Question and Answers Part 4","url":"\/\/www.gunkrazy.com\/machine-design-mcq-objective-question-answer-part4\/","articleBody":"Machine Design MCQ Objective Question and Answers Part 4\u00a0\r\nMachine Design Multiple choice Objective Question useful for technical Aptitude test.\r\n\r\n\r\n\r\nMachine Design MCQ : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\r\n\r\n101. The piston rod of a steam engine is usually connected to the crosshead by means of\r\n(a) bolted joint\r\n(b) kunckle joint\r\n(c) cotter joint\r\n(d) universal joint\r\n(e) universal coupling.\r\nAns: c\r\n\r\n102. Which of the following pipe joints would be suitable for pipes carrying steam\r\n(a) flanged\r\n(b) threaded\r\n(c) bell and spigot\r\n(d) expansion\r\n(e) compression.\r\nAns: d\r\n\r\n103. Spring index is\r\n(a) ratio of coil diameter to wire diameter\r\n(b) load required to produce unit deflection\r\n(c) its capability of storing energy\r\n(d) indication of quality of spring\r\n(e) nothing.\r\nAns: a\r\n\r\n104. The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is\r\n(a) larger\r\n(b) smaller\r\n(c) equal\r\n(d) larger\/smaller depending on diameter of spring coil\r\n(e) unpredictable.\r\nAns: a\r\n\r\n105. Form coefficient of spring is\r\n(a) ratio of coil diameter to wire diameter\r\n(b) load required to produce unit deflection\r\n(c) its capability of storing energy\r\n(d) concerned With strength of wire of spring\r\n(e)\u00a0 nothing\r\nAns: c\r\n\r\n106. Spring stiffness is\r\n(a) ratio of coil diameter to wire diameter\r\n(b) load required to produce unit deflection\r\n(c) its capability of storing energy\r\n(d) its ability to absorb shocks\r\n(e) none of the above.\r\nAns: b\r\n\r\n107. When two springs are in series (having stiffness K), the equivalent stiffness will be\r\n(a) K\r\n(b) K\/2\r\n(c) 2K\r\n(d) KIA\r\n(e) UK.\r\nAns: b\r\n\r\n108. When a close coiled helical spring is compressed, its wire is subjected to\r\n(a) tension\r\n(b) shear\r\n(c) compression\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: a\r\n\r\n109. If a spring is cut down into two springs, the stiffness of cut springs will be\r\n(a) half\r\n(b) same\r\n(c) double\r\n(d) unpredictable\r\n(e) none of the above.\r\nAns: c\r\n\r\n110. Belt slip may occur due to\r\n(a) heavy load\r\n(b) loose belt\r\n(c) driving pulley too small\r\n(d) all of the above\r\n(e) none of the above.\r\nAns: d\r\n\r\n111. Aircraft body is usually fabricated by\r\n(a) welding\r\n(b) precasting\r\n(c) rivetting\r\n(d) casting\r\n(e) unconventional methods.\r\nAns: c\r\n\r\n112. If two springs are in parallel then their overall stiffness will be\r\n(a) half\r\n(b) same\r\n(c) double\r\n(d) unpredictable\r\n(e) none of the above.\r\nAns: c\r\n\r\n113. In hydrodynamic bearings\r\n(a) the oil film pressure is generated only by the rotation of the journal\r\n(b) the oil film is maintained by supplying oil under pressure\r\n(c) do not require external supply of lubricant\r\n(d) grease is used for lubrication\r\n(e) none of the above.\r\nAns: a\r\n\r\nBearing Types\r\n\r\n114. Antifriction bearings are\r\n(a) sleeve bearings\r\n(b) hydrodynamic bearings\r\n(c) thin lubricated bearings\r\n(d) ball and roller bearings\r\n(e) none of the above.\r\nAns: e\r\n\r\n115. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by\r\n(a) ZN\/p\r\n(b) p\/ZN\r\n(c) Z\/pN\r\n(d) N\/Zp\r\n(e) Zp\/N.\r\nAns: a\r\n\r\n116. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is\r\n(a) 0.01 micron\r\n(b) 0.1 micron\r\n(c) 1 micron\r\n(d) 10 microns\r\n(e) 25 microns.\r\nAns: c\r\n\r\n117. In hydrostatic bearings\r\n(a) the Oil film pressure is generated only by the rotation of the journal\r\n(b) the oil film is maintained by supplying oil under pressure\r\n(c) do not require external supply of lubricant\r\n(d) grease is used for lubrication\r\n(e) none of the above.\r\nAns: b\r\n\r\n118. Oil in journal bearing should be applied at the point where load is\r\n(a) nil or lightest\r\n(b) maximum\r\n(c) average\r\n(d) any one of the above\r\n(e) unpredictable.\r\nAns: a\r\n\r\n119. The rated life of a bearing varies\r\n(a) directly as load\r\n(b) inversely as square of load\r\n(c) inversely as cube of load\r\n(d) inversely as fourth power of load\r\n(e) none of the above.\r\nAns: c\r\n\r\n120. In oilness bearings\r\n(a) the oil film pressure is generated only by the rotation of the journal\r\n(b) the oil film is maintained by supplying oil under pressure\r\n(c) do not require external supply of lubricant\r\n(d) grease required to be applied after some intervals\r\n(e) none of the above.\r\nAns: c\r\n\r\n121. In V-belt drive, belt touches\r\n(a) at bottom\r\n(b) at sides only\r\n(c) both at bottom and sides\r\n(d) could touch anywhere\r\n(e) none of the above.\r\nAns: b\r\n\r\n122. Three different weights fall from a certain height under vacuum. They will take\r\n(a) same time to reach earth\r\n(b) times proportional to weight to reach earth\r\n(c) times inversely proportional to weight to reach earth\r\n(d) unpredictable\r\n(e) none of the above.\r\nAns: a\r\n\r\n123. In cross or regular lay ropes\r\n(a) direction of twist of wires in strands is opposite to the direction of twist of strands\r\n(b) direction of twist of wires and strands are same\r\n(c) wires in two adjacent strands are twisted in opposite direction\r\n(d) wires are not twisted\r\n(e) none of the above.\r\nAns: a\r\n\r\n124. In standard taper roller bearings, the angle of taper of outer raceway is\r\n(a) 5\u00b0\r\n(b) 8\u00b0\r\n(c) 15\u00b0\r\n(d) 25\u00b0\r\n(e) 40\u00b0.\r\nAns: d\r\n\r\n125. In composite or reverse laid ropes\r\n(a) direction of twist of wires in strands is opposite to the direction of twist of strands\r\n(b) direction of twist of wires and strands are same\r\n(c) wires in two adjacent strands are twisted in opposite direction\r\n(d) wires are not twisted\r\n(e) none of the above.\r\nAns: c\r\n\r\n126. Whether any core is required in wire ropes\r\n(a) yes\r\n(b) no\r\n(c) sometimes\r\n(d) rarely\r\n(e) very often.\r\nAns: a\r\n\r\n127. If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to\r\n(a) diameter of bolt\r\n(b) 0.75 x diameter of bolt\r\n(c) 1.25 x diameter of bolt\r\n(d) 1.5 x diameter of bolt\r\n(e) 0.5 x diameter of bolt.\r\nAns: a\r\n\r\n128. Basic shaft is one\r\n(a) whose upper deviation is zero\r\n(b) whose lower deviation is zero\r\n(c) whose lower as well as upper deviations are zero\r\n(d) does not exist\r\n(e) none of the above.\r\nAns: a\r\n\r\n129. Basic hole is one\r\n(a) whose upper deviation is zero\r\n(b) whose lower deviation is zero\r\n(c) whose lower as well as upper deviations are zero\r\n(d) does not exist\r\n(e) none of the above.\r\nAns: b\r\n\r\n130. I.S. specifies following total number of grades of tolerances\r\n(a) 18\r\n(b) 16\r\n(c) 20\r\n(d) 22\r\n(e) 14.\r\nAns: a\r\n\r\n131. For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately\r\n(a) 0.4 times\r\n(b) 0.6 times\r\n(c) 0.7 times\r\n(d) 0.8 times\r\n(e) 0.9 times the normal diameter of bolt.\r\nAns: a\r\n\r\n132. Allen bolts are\r\n(a) self locking bolts\r\n(b) designed for shock load\r\n(c) used in aircraft application\r\n(d) provided with hexagonal depression in head\r\n(e) uniform strength bolts.\r\nAns: d\r\n\r\n133. The resultant axial load on a bolt depends on\r\n(a) initial tension\r\n(b) external load applied\r\n(c) relative elastic yielding (springness) of the bolt and the connected member\r\n(d) (a) and (b) above\r\n(e) (a), (b) and (c) above.\r\nAns: e\r\n\r\n134. The connecting rod bolts are tightened up so that tightening stress\r\n(a) is just sufficient to hold parts together\r\n(b) approaches yield point\r\n(c) is 50% of yield point\r\n(d) is about yield point divided by safety factor\r\n(e) none of the above.\r\nAns: b\r\n\r\n135. The connecting rod bolts are tightened up with initial tension greater than the external load so that\r\n(a) joint may not open up\r\n(b) bolts are weakest elements\r\n(c) the resultant load on the bolt would not be affected by the external cyclic load\r\n(d) bolts will not loosen during service\r\n(e) none of the above.\r\nAns: c\r\n\r\n136. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited\r\n(a) square\r\n(b) acme\r\n(c) buttress\r\n(d) BSW\r\n(e) metric.\r\nAns: c\r\n\r\n137. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at\r\n(a) shank\r\n(b) head\r\n(c) in the middle\r\n(d) at the thread\r\n(e) anywhere in the bolt.\r\nAns: d\r\n\r\n138. The shock absorbing capacity of a bolt can be increased by\r\n(a) tightening it properly\r\n(b) increasing shank diameter\r\n(c) grinding the shank\r\n(d) using washer\r\n(e) making shank diameter equal to core diameter of thread.\r\nAns: e\r\n\r\n\r\n\r\nMachine Design MCQ : Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical MCQ Objectives Question and Answers\r\nTechnical Mechanical Interview Question and Answers\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\n\r\n\r\n\r\n&nbsp;","headline":"Machine Design MCQ Objective Question and Answers Part 4","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-06-12","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"","height":0,"width":0},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <nav class="pagination-wrapper" aria-label="article pagination"> <a class="prev page-numbers" href="?page_num=34">&laquo; PREV</a> <a class="page-numbers" href="?page_num=1"><span class="screen-reader-text">Page </span>1</a> <span class="page-numbers dots">&hellip;</span> <a class="page-numbers" href="?page_num=33"><span class="screen-reader-text">Page </span>33</a> <a class="page-numbers" href="?page_num=34"><span class="screen-reader-text">Page </span>34</a> <span aria-current="page" class="page-numbers current"><span class="screen-reader-text">Page </span>35</span> <a class="page-numbers" href="?page_num=36"><span class="screen-reader-text">Page </span>36</a> <a class="page-numbers" href="?page_num=37"><span class="screen-reader-text">Page </span>37</a> <span class="page-numbers dots">&hellip;</span> <a class="page-numbers" href="?page_num=338"><span class="screen-reader-text">Page </span>338</a> <a class="next page-numbers" href="?page_num=36">NEXT &raquo;</a></nav></section></main><aside id="secondary" class="widget-area"><div class="about-wrapper"><h2 class="widget-title" style="background: #d693c6; color: #ff392e">About Us</h2><div class="about-image" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2020/03/Sachin-Thorat-300x300-min.png')"></div><p class="about-copy">LearnMech.Com is a Mechanical Project-oriented platform run by Sachin Thorat who is a B-Tech Graduate in Mechanical Engineering. 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