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Clutch and Brake Design | Interview, Viva , Oral Question and Answers  1. What factors should be considered when designing friction...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/clutch-and-brake-design-interview-question-and-answers/" aria-label="View Post: Clutch and Brake Design | Interview Question and Answers">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Clutch and Brake Design | Interview Question and Answers","url":"\/\/www.gunkrazy.com\/clutch-and-brake-design-interview-question-and-answers\/","articleBody":"Clutch and Brake Design | Interview Question and Answers \r\nClutch and Brake Design | Interview, Viva , Oral Question and Answers\r\n\r\n\r\n\r\n1. What factors should be considered when designing friction clutches? Or what are the desirable properties of friction material to be used for clutches.\u00a0\r\n\r\n(a)The friction materials for the clutch should have high coefficient of friction\r\n(b) They should not be affected by moisture and oil.\r\n(c) May be light in weight.\r\n(d) Dissipate heat quickly.\r\n\r\n2. Name four materials used for lining of friction surfaces in clutches.\r\n\r\n1. Wood 2. Leather 3. Asbestos based friction materials 4. Powdered metal friction materials.\r\n\r\n3. What is the function of clutch in a transmission system?\u00a0\r\n\r\nClutch is machine component used as temporary coupling and is used mainly in automobiles for engaging and disengaging the driving shaft where periodical engagement is required.\r\n\r\n4. What is meant by positive clutch?\u00a0\r\n\r\nWhich transmits power from driving shaft to the driven shaft by jaws or teeth is called positive clutch.No slipping is there.\r\n\r\n5. By what means, power is transmitted by clutches?\r\n\r\nIn clutches, power transmission is achieved through (a) Interlocking (b) Friction (c) Wedging\r\n\r\n6. Why are cone clutches better than disc clutches?\r\n\r\nSince the cone discs are having large frictional areas and they can transmit a larger torque than disc clutches with, the same diameter and actuating force and hence cone clutches are preferred over disk clutches. But usually cone clutches are mainly used in low peripheral applications.\r\n\r\n7. Why should the generated heat be dissipated in clutch operation?\u00a0\r\n\r\nIn order to save the friction plates and materials from melting by the heat produced during operation, the generated heat should be dissipated.\r\n\r\n8. Name the two theories applied for the design of friction clutches.\r\n\r\n1. Uniform Pressure theory\r\n2. Uniform wear theory\r\n\r\n9. In what ways, the clutches are different from brakes?\r\n\r\nThe clutch used to engage the driving and driven members and keep them moving (i.e., rotating) together, whereas brakes are employed to stop a moving member or reduce its speed.\r\n\r\n10. What is the function of brake?\r\n\r\nBrake is mechanical device by means of which motion of a body is retarded for slowing down or to bring it to rest, by applying artificial frictional resistance.\r\n\r\n11. Give examples of radial and axial brakes.\r\n\r\nRadial brakes: band brakes, block brakes, and internal expanding rim\r\nAxial brakes: cone brakes and disc brakes.\r\n\r\n12. What are the types of brake lining?\r\n\r\n1. Organic lining\r\n2. Semi-metallic lining\r\n3. Metallic lining\r\n\r\n13. What is a self locking brake?\u00a0\r\n\r\nWhen the frictional force is sufficient enough to apply the brake with no external forces, then the brake is said to be self locking brake.\r\n\r\n14. What you meant by self energizing brake?\u00a0\r\n\r\nWhen the moment of applied force and moment of frictional force are in the same direction, then the frictional force helps in applying the brake. This type of brake is known as self energizing brake.\r\n\r\n15. Two blocks diametrically opposite to each other are used in a block brake. Why?\r\n\r\nIf only one block is used for braking, then there will be side thrust on the bearings of wheel shaft. This drawback can be removed by providing two blocks on the two sides of the drum diametrically opposite.\r\n\r\n16. If a multidisc clutch has 6 discs in driving shaft and 7 discs in driven shaft, then how many number of contact surfaces it will have?\u00a0\r\n\r\nNumber of discs in driving shaft (n1) = 6\r\nNumber of discs in driven shaft (n2) = 7\r\nNumber of contact surfaces (n) = n1+n2-1= 6+7-1=12\r\n\r\n17. Why in automobiles, braking action when traveling in reverse is not as effective as when moving forward?\u00a0\r\n\r\nWhen an automobiles moves forward, the braking force acts in the opposite direction to the direction of motion of the vehicle. whereas in reverse travelling the braking force acts in the same direction to the direction of motion of the vehicle.so it requires more braking force to apply brake.\r\n\r\n18. Classify clutches based on the coupling methods.\u00a0\r\n\r\n(i) Mechanical clutch (ii) Pneumatic clutch (iii) Hydraulic clutch (iv) Electrical clutch\r\n\r\nParts Of Clutch\r\n\r\nRead more :\r\nFunction and Requirement Of Automobile Clutches | Types Of Clutches\r\nIntroduction To Clutch - Clutch Types, Principle, Types Of Clutches\r\n\r\n19. In a hoisting machinery, what are the different energies absorbed by a brake system?\u00a0\r\n\r\nPotential energy and kinetic energy of load which is handled by hoist.\r\n\r\n19. Name different types of clutch.\r\n\r\n1. Friction clutch\r\n2. Diaphragm clutch\r\n3. Fluid coupling\r\n4. Magnetic clutch.\r\n\r\n20 . List the advantages and application of multiplate clutch.\r\n\r\nAdvantages: \r\n\r\n1. More torque can be transmitted.\r\n2. Slip is reduced\r\n\r\nApplications:\r\n\r\n1. Automobile 2. Machine tools\r\n\r\n21. List the characteristics of material used for brake lining.\r\n\r\n1. High coefficient of friction\r\n2. Low rate of wear\r\n3. High heat transfer coefficient\r\n4. Low cost.\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nAutomobile Engineering Parts and System Notes , Article\r\nManufacturing Technology Notes , Articles\r\nLatest seminar topic index - Report ,PPT Download\r\n\r\n\r\n\r\n&nbsp;","headline":"Clutch and Brake Design | Interview Question and Answers","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-02","mainEntityOfPage":"False","dateModified":"February 19, 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> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/gearbox-design-machine-design-interview-question-and-answers/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/05/design-of-gear-box-25-638-300x225.jpg')"></div><span class="sr-only">link to Gearbox Design | Machine Design- Interview Question and Answers</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/gearbox-design-machine-design-interview-question-and-answers/">Gearbox Design | Machine Design- Interview Question and Answers</a></p></header><div class="excerpt"><p>Gearbox Design | Machine Design- Interview Question and Answers
Gearbox Design | Machine Design- Interview Question and Answers  1. What purpose does the housing of gear-box serve?  Gear-box...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/gearbox-design-machine-design-interview-question-and-answers/" aria-label="View Post: Gearbox Design | Machine Design- Interview Question and Answers">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Gearbox Design | Machine Design- Interview Question and Answers","url":"\/\/www.gunkrazy.com\/gearbox-design-machine-design-interview-question-and-answers\/","articleBody":"Gearbox Design | Machine Design- Interview Question and Answers\r\nGearbox Design | Machine Design- Interview Question and Answers\r\n\r\n1. What purpose does the housing of gear-box serve?\r\n\r\nGear-box -housing or casing is used as container inside which, the gears, shafts, bearings and other components are \"mounted.' Also it prevents the entry of dust inside the housing and reduces noise of operation. That is, the housing Safe-guard the inner components.\r\n\r\n2. What is the function of spacers in a gear-box? (Or) What spacers are as applied to a gear-box?\r\n\r\nSpacers are sleeve like components, which are mounted, in shafts in-between gears and bearings or one gear and another gear in order to maintain the distance between them so as to avoid interruption between them .\r\n\r\n3. Fill in the blanks of the following.\r\n\r\n(a) The number of gears employed in a gear-box is kept to the minimum by arranging the speed of the spindle is ........................... series.\r\n(b) In a gear- box, for a set of gears, if the centre distance and module are same, then the sum of teeth of engaging pair will be ..............\r\n\r\nAnswers\r\na) Geometric series.\r\nb) Equal.\r\n\r\n4. What is a speed diagram? (or) what is ray diagram?\r\n\r\nSpeed diagram is the graphical representation of different speeds of output shaft, motor shaft and intermediate shafts.\r\n\r\nDesign of gear box\r\n\r\n5. For what purpose we are using gear-box?\r\n\r\nSince the gear-box is provided with number of gears of different size arranged is different forms, we can get number of output speeds by operated motor at single speed.\r\n\r\n6. Name the types of speed reducers.\r\n\r\na) Single reduction speed reduces.\r\nb) Multi reduction speed reducers.\r\n\r\n7. What does the ray-diagram of gear-box indicate?\r\n\r\nThe ray-diagram or kinematic arrangement of a gear box indicates arrangement of various gears in various shafts of the gear box in order to obtain the different output speeds from the single speed of the motor.\r\n\r\n8. What is step ratio? Or define Progression ratio.\r\n\r\nWhen the spindle speeds are arranged in geometric progression, then the ratio between the two adjacent speeds is known as step ratio or progression ratio.\r\n\r\n9. What are the possible arrangements to achieve 12 speeds from a gear box?\r\n\r\n(i) 3 x 2 x 2 scheme\r\n(ii) 2 x 3 x 2 scheme\r\n(iii) 2 x 2 x 3 scheme\r\n\r\n10. What are the possible arrangements to achieve 16 speeds from a gear box?\u00a0\r\n\r\n(i) 4 x 2 x 2 scheme\r\n(ii) 2 x 4 x 2 scheme\r\n(iii) 2 x 2 x 4 scheme\r\n\r\n11. Differentiate ray diagram and structural diagram.\u00a0\r\n\r\n \tThe ray diagram is a graphical representation of the structural formula.\r\n \tThe structural diagram is a kinematic layout that shows the arrangement of gears in a gear box.\r\n\r\n12. List any two methods used for changing speed in gear boxes.\r\n\r\n \tSliding mesh gear box\r\n \tConstant mesh gear box and\r\n \tSynchromesh gear box.\r\n\r\n13. What are preferred numbers?\u00a0\r\n\r\nPreferred numbers are the conveniently rounded off values derived from geometric series. There are five basic series, denoted as R5, R10, R20, R40, and R80 series.\r\n\r\n14. Name the series in which speeds are arranged in multispeed gear boxes.\r\n\r\nBasic series are R5, R10, R20 and R40.\r\n\r\n15. Which type of gear is used in constant mesh gear box? Justify.\u00a0\r\n\r\nHelical gears are used in constant mesh gear boxes to provide quieter and smooth operation.\r\n\r\n16. Where are multispeed gear boxes employed?\u00a0\r\n\r\nMulti speed gear boxes where employed wherever the variable spindle speeds are necessary.\r\n\r\n\r\n\r\nMore Resources \/articles\r\nCAD \/ CAM Projects List - Abstract , Report Download\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\nFluid Power System - Hydraulic and Pneumatic Notes\r\nQuality Control- Articles , notes , Interview Q and A\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\n\r\n\r\n\r\n&nbsp;","headline":"Gearbox Design | Machine Design- Interview Question and Answers","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-02","mainEntityOfPage":"False","dateModified":"February 19, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/design-of-gear-box-25-638-300x225.jpg","height":225,"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/design-and-fabrication-of-pedal-operated-car-mechanical-project/">Design and Fabrication Of Pedal Operated Car &#8211; Mechanical Project</a></p></header><div class="excerpt"><p>Design and Fabrication Of Pedal Operated Car - Mechanical Project
This is simple Mechanical project . This project consist of pedal mechanism ,seating arrangement , steering mechanism , braking...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/design-and-fabrication-of-pedal-operated-car-mechanical-project/" aria-label="View Post: Design and Fabrication Of Pedal Operated Car &#8211; Mechanical Project">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Design and Fabrication Of Pedal Operated Car &#8211; Mechanical Project","url":"\/\/www.gunkrazy.com\/design-and-fabrication-of-pedal-operated-car-mechanical-project\/","articleBody":"Design and Fabrication Of Pedal Operated Car - Mechanical Project\r\nThis is simple Mechanical project . This project consist of pedal mechanism ,seating arrangement , steering mechanism , braking system , Four wheels arrangement . This is basically two seater car driven by both humans so that effort required are less .\r\n\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nLatest seminar topic index - Report ,PPT Download\r\nPedal Operated (Bicycle ) projects\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Design and Fabrication Of Pedal Operated Car &#8211; Mechanical Project","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-02","mainEntityOfPage":"False","dateModified":"February 19, 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> <article class="article-card horizontal no-thumb"><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/temporary-and-permanent-joints-interview-question-and-answers/">Temporary and Permanent Joints | Interview Question and Answers</a></p></header><div class="excerpt"><p>Temporary and Permanent Joints | Interview Question and Answers
Temporary and Permanent Joints | Interview ,viva , Oral Question and Answers  1. What are the purposes of screws?  To secure...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/temporary-and-permanent-joints-interview-question-and-answers/" aria-label="View Post: Temporary and Permanent Joints | Interview Question and Answers">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Temporary and Permanent Joints | Interview Question and Answers","url":"\/\/www.gunkrazy.com\/temporary-and-permanent-joints-interview-question-and-answers\/","articleBody":"Temporary and Permanent Joints | Interview Question and Answers\r\nTemporary and Permanent Joints | Interview ,viva , Oral Question and Answers\r\n\r\n1. What are the purposes of screws?\r\n\r\nTo secure members\r\nTo transmit power\r\n\r\n2. What is a stud?\r\n\r\nA stud is a bolt in which the head is replaced by a threaded end. It passes through one of the parts to be connected and is crewed into the other part.\r\n\r\n3. How is bolt designated?\r\n\r\nA bolt is designated by a letter M followed by nominal diameter and pitch in mm.\r\n\r\n4. How is a bolt designated? Give example.\r\n\r\nA thread is designated with Letter M followed by Nominal diameter in mm and Pitch in mm [for fine pitches only]\r\nMd\u00d7p\r\n\r\nIf coarse pitches are used then P value is omitted. Thus M20\u00d72.5 means, Nominal diameter is 20mm\r\n2.5mm pitch, fine thread. M20 means, 20mm nominal diameter with coarse threads.\r\n\r\n5. What is the meaning of bolt M24\u00d72?\r\n\r\nBolt nominal diameter, d=24mm and bolt pitch, p=2mm\r\n\r\n6. State the advantages of threaded joints?\r\n\r\n \tHigh clamping\r\n \tSmall tightening force requirement\r\n \tEasy manufacturing\r\n \tSimple design\r\n\r\nTypes Of Riveted Joints and their Applications-Machine Design\u00a0\r\n\r\n7. Define the term self-locking of power screws?\r\n\r\nIf the friction angle is greater than helix angle of the power screw, the torque required to lower the load will be positive, indicating that an effort is applied to lower the load. This type is screw is known as self locking screw. The efficiency of the\r\nself locking screw is less than 50%.\r\n\r\n8. Define welding?\r\n\r\nWelding can be defined as a process of joining two similar or dissimilar metals with or without application of pressure along with or without addition of filler material.\r\n\r\n9. Why are welded joints preferred over riveted joints?\r\n\r\nMaterial is saved in welded joints and hence the machine element will be light if welded joints are used instead of riveted joints. Leak proof joints can be easily obtained by welded joints compared riveted joints.\r\n\r\n10. How is welding classified?\r\n\r\n1. Forge welding\r\n2. Electric resistance welding\r\n3. Fusion welding\r\n\r\nRead more ; Classification Of Welding Processes and allied Processes\r\n\r\n11. What are the types of welded joints?\r\n\r\n1. Butt joints\r\n2. Lap joints\r\n3. T joints\r\n4. Corner joints\r\n5. Edge joints\r\n\r\n12. Define butt and lap joint?\r\n\r\n1. Butt joint is made by welding the ends or edges of two plates.\r\n2. Lap joint is made by two plates are overlapping each other for a certain distance. Then welded. Such welding is called fillet weld.\r\n\r\n13. Define Tee joint and corner joint?\r\n\r\n \tT joint: the two plates are arranged in shape which means the plates are located at right angles to each other.Corner\r\n \tweld: Two plates are arranged at right angles such that it forms an angle.\r\n\r\n14. When will the edge preparation need?\r\n\r\nIf the two plates to be welded have more than 6 mm thickness, the edge preparation should be carried out.\r\n\r\n15. What is the minimum size for fillet weld? If the required weld size from strength consideration is too small how will you fulfill the condition of minimum weld size?\r\n\r\nIt is the defined as the minimum size of the weld for a given thickness of the thinner part joined or plate to avoid cold cracking by escaping the rapid cooling.\r\n\r\n16. When will the weld deposit be weaker?\r\n\r\nWhen the components are made of high carbon steel or alloy steel, the weld becomes weaker.\r\n\r\n17. What is a rivet?\r\n\r\nA rivet is a round bar provided with a head on one side and a tail on the Other side.\r\n\r\n18. What is the different working processes used for making riveting?\r\n\r\n1 Cold riveting 2 hot riveting\r\n\r\n19. Name the possible modes of failure of riveting joint.\r\n\r\n1. Crushing of rivets\r\n2. Shear of rivets\r\n3. Tearing of the plate at the edge\r\n4. Tearing of the plate between rivets.\r\n\r\n20. Define circumferential joint.\r\n\r\nThe ends of the plates are joined to the required length of the shell and to Close its ends.\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nLatest seminar topic index - Report ,PPT Download\r\nMechanical Subjectwise Basic Concept Notes ,Articles\r\nTechnical Mechanical Interview Question and Answers\r\n\r\n\r\n\r\n&nbsp;","headline":"Temporary and Permanent Joints | Interview Question and Answers","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-02","mainEntityOfPage":"False","dateModified":"February 19, 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> <article class="article-card horizontal no-thumb"><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/shaft-coupling-interview-question-answers/">Shaft and Coupling Basic | Interview question and Answers</a></p></header><div class="excerpt"><p>Shaft and Coupling Basic | Interview question and Answers
Shaft and Coupling Basic - Machine Design interview  , VIVA , oral examination Question and Answers   1. What is a shaft?  A shaft is...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/shaft-coupling-interview-question-answers/" aria-label="View Post: Shaft and Coupling Basic | Interview question and Answers">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Shaft and Coupling Basic | Interview question and Answers","url":"\/\/www.gunkrazy.com\/shaft-coupling-interview-question-answers\/","articleBody":"Shaft and Coupling Basic | Interview question and Answers\r\nShaft and Coupling Basic - Machine Design interview\u00a0 , VIVA , oral examination Question and Answers\u00a0\r\n\r\n1. What is a shaft?\r\n\r\nA shaft is a rotating machine element, which transits power from one point to another point.\r\n\r\n2. What are the types of shaft?\r\n\r\n \tLine shaft\r\n \tSpindle\r\n \tStub shaft\r\n \tCounter shaft\r\n\r\n3. What are the types of rigidity?\r\n\r\n \tTorsional rigidity\r\n \tLateral rigidity\r\n\r\n4. Why a hollow shaft has greater strength and stiffness than solid shaft of equal weight?\r\n\r\nStresses are maximum at the outer surface of a shaft. Hollow shaft has almost all the material concentrated at the outer circumference and so has a better strength and stiffness for equal weight.\r\n\r\n5. Why is maximum shear stress theory used for shaft?\r\n\r\nSince, the shaft is made of ductile material; maximum shear stress thus is used\r\n\r\n6. What is the significance of slenderness ratio in shaft design?\r\n\r\nIf slenderness ratio is increased the shaft deviates from its \u201cstub\u201d behavior And it is essential to consider bucking while designing the shaft.\r\n\r\n7. Define the term critical speed?\r\n\r\nThe speed at which the shaft runs so that the additional deflection of the shaft from the axis of rotation becomes infinite, is known as critical speed\r\n\r\n8.What is a key?\r\n\r\nA key is a device which is used for connecting two machine parts for preventing relative motion of rotation with respect to each other.\r\n\r\n9. What are the types of key?\r\n\r\n \tSaddle key\r\n \tTangent key\r\n \tSunk key\r\n \tRound key and taper pins.\r\n\r\nTypes Of keys\r\n\r\n10.What is the main use of woodruff keys?\r\n\r\nA woodruff key is used to transmit small value of torque in automotive and machine tool industries. The keyway in the shaft is milled in a curved shape whereas the key way in the hub is usually straight.\r\n\r\n11.What types of stress are developed in the key?\r\n\r\nShear stress and crushing stress\r\n\r\n12.Classify crankshafts.\r\n\r\nSingle throw crankshafts\r\nMulti throw crankshafts\r\n\r\n13. What are functions of crankshafts?\r\n\r\nCrankshafts are used to convent lottery motion into reciprocating motion.\r\n\r\n14. What are the materials used for crankshafts?\r\n\r\nFor I C engine or mild steel and automobile.\r\n\r\n15. What is coupling?\r\n\r\nThe elements which join two shafts are coupling. It is used to connect sections of long transmissions shaft to the shaft of a driving machine. Couplings are used to connect sections of long transmission shafts and to connect the shaft of a driving machine to the shaft of a driven machine.\r\n\r\n16. What is the function of a coupling between two shafts?\r\n\r\nCouplings are used to connect sections of long transmission shafts and to connect the shaft of a driving machine to the shaft of a driven machine.\r\n\r\n17. Under what circumstances flexible couplings are used?\r\n\r\nThey are used to join the abutting ends of shafts when they are not in exact alignment.They are used to permit an axial misalignment of the shafts without under absorption of the power, which the shafts are transmitting\r\n\r\n18.Where are flexible couplings used?\r\n\r\n \tVehicle\r\n \tStationery machinery\r\n \tAutomotive drives\r\n \tMachine tools\r\n\r\n19.What is the material used for flange or flange coupling?\r\n\r\nCast iron\r\n\r\n20.What is the advantage of gear coupling?\r\n\r\nGear coupling is a grid coupling with some flexibility because of using curved external teeth Strength of gear coupling is very high. Most compact coupling for high power transmission.\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMachine Tool , Manufacturing Projects List - Abstract , Report\r\nIC Engine Articles , Notes , Question and Answer\r\nTechnical Mechanical Interview Question and Answers\r\nLatest seminar topic index - Report ,PPT Download\r\n\r\n\r\n\r\n&nbsp;","headline":"Shaft and Coupling Basic | Interview question and Answers","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-02","mainEntityOfPage":"False","dateModified":"February 19, 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> <article class="article-card horizontal no-thumb"><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/machine-design-basic-interview-question-and-answers/">Machine Design Basic | Interview Question and Answers</a></p></header><div class="excerpt"><p>Machine Design Basic | Interview Question and Answers
Machine Design Basic - Interview ,viva , Objective Question and Answers 
1. Define design.  Design is a process of activities to gather all...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/machine-design-basic-interview-question-and-answers/" aria-label="View Post: Machine Design Basic | Interview Question and Answers">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Machine Design Basic | Interview Question and Answers","url":"\/\/www.gunkrazy.com\/machine-design-basic-interview-question-and-answers\/","articleBody":"Machine Design Basic | Interview Question and Answers\r\nMachine Design Basic - Interview ,viva , Objective Question and Answers\u00a0\r\n1. Define design.\r\n\r\nDesign is a process of activities to gather all the information necessary to realize the designer\u2019s idea as real product.\r\n\r\n2. What are the various phases of design process?\r\n\r\n(i) Recognition of need\r\n(ii) Definition of problem\r\n(iii) Synthesis\r\n(iv) Analysis and optimization\r\n(v) Evaluation\r\n(vi) Presentation\r\n\r\nSteps In Engineering Design Process - Engineering Design\r\n\r\n3. List some factors that influence machine design.\r\n\r\n(i) Strength and stiffness\r\n(ii) Surface finish and tolerance\r\n(iii) Manufacturability\r\n(iv) Economic and aesthetics\r\n(v) Working atmosphere\r\n(vi) Safety and reliability cost\r\n\r\n4. Define optimization?\r\n\r\nOptimization is the process of maximizing a desired quantity or minimizing the unwanted one.\r\n\r\nRead more ;\u00a0Optimization Project List For Mechanical Students\r\n\r\n5. What are the various optimization methods available?\r\n\r\n(i) Optimization by evaluation\r\n(ii) Optimization by intuition\r\n(iii) Optimization by trial&amp; error\r\n(iv) Optimization by numerical algorithm\r\n\r\n6. Describe material properties hardness, stiffness and resilience.\r\n\r\n \tHardness is the ability of material to resist scratching and indentation Stiffness is the ability of material to resist deformation under loading.\r\n \tResilience is the ability of material to resist absorb energy and to resist shock and impact load.\r\n\r\n7. What is an impact load? Give examples.\r\n\r\nIf the time load application is less than one third of the lowest national period of vibration of the part, the load is called an impact load. Example: Punching presses, hammers, loads exerted on cams during the motion due to eccentricity, loads imposed on gear teeth due to irregular tooth profile.\r\n\r\nRead more :\u00a0Types Of Loads Used in Engineering Field\r\n\r\n8. Define principal plane and principal stresses?\r\n\r\nA plane where only normal stresses act, with no shear stress acting is called principal plane. The (normal) stress acting on this plane is called principal stresses.\r\n\r\n9. Define factor of safety?\r\n\r\nThe ratio between maximum stresses to working stress is known as factor of safety.\r\nFactor of safety= Maximum stress\/ working stress\r\n\r\nRead More :\u00a0Factor Of Safety Used in Machine Design | Significance | Importance\r\n\r\n10. What are the factors to be considered in the selection of material for a machine element?\r\n\r\na. Required material properties\r\nb. Manufacturing ease\r\nc. Material availability\r\nd. Cost\r\n\r\n11. Why normal stress theory is not suitable for ductile materials?\r\n\r\nDuctile materials mostly fail by shearing. But this theory considers only tensile or compressive stresses. So this is not suitable for ductile materials.\r\n\r\n12. State the various methods of finding stresses concentration factors?\r\n\r\na. Photo elasticity method\r\nb. Grid method\r\nc. Brittle coating method\r\nd. Strain gauge method\r\ne. Finite element techniques\r\n\r\n13. Give some methods of reducing stress concentration?\r\n\r\na. Avoiding sharp corners\r\nb. Providing fillets\r\nc. Use of multiple holes instead of single holes.\r\n\r\n14. What are the factors that affect notch sensitivity?\r\n\r\na. Materials\r\nb. Notch radius\r\nc. Size of component\r\nd. Type of loading\r\ne. Grain Structure\r\n\r\n15. What are the types of variable stresses?\r\n\r\na. Completely reverse or cyclic stresses\r\nb. Fluctuating stresses\r\nc. Repeated stresses\r\nd. Alternating stresses\r\n\r\n16. What are the various theories of failure?\r\n\r\na. Maximum principal stress theory\r\nb. Maximum shear stress theory\r\nc. Maximum principal strain theory\r\nd. Maximum strain energy theory\r\n\r\n17. Explain size factor in endurance strength?\r\n\r\nSize factor is used to consider the effect of the size on endurance strength. A large size object will have more defects compared to a small one. So endurance strength is reduced. \r\n\r\nIf K is the size factor,\r\nActual endurance strength = theoretical endurance limit x K\r\n\r\n18. What are the methods used to improve fatigue strength?\r\n\r\n(i) Cold working like short peening, burnishing\r\n(ii) Heat treatments like induction hardening\r\n(iii) Pre stressing\r\n\r\n19. What is an S-N curve?\r\n\r\nAn S-N curve has fatigue stress on Y- axis and number of loading cycles in X- axis. It is used to find the fatigue stress value corresponding to a given number of cycles.\r\n\r\n20 What is low and high cycle fatigue?\r\n\r\nFatigue within 10 ^3\u00a0 cycles is known as low cycle fatigue. Fatigue at high number cycles is called high cycle fatigue.\r\n\r\n\r\n\r\nMore Resources \/articles\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nRAC \/ HVAC - Articles , Notes , Que and Answers\r\nIndustrial Engineering Notes , Articles , Interview Que &amp; Ans\r\nLatest seminar topic index - Report ,PPT Download\r\n\r\n\r\n\r\n&nbsp;","headline":"Machine Design Basic | Interview Question and Answers","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-01","mainEntityOfPage":"False","dateModified":"February 19, 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=56">&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=55"><span class="screen-reader-text">Page </span>55</a> <a class="page-numbers" href="?page_num=56"><span class="screen-reader-text">Page </span>56</a> <span aria-current="page" class="page-numbers current"><span class="screen-reader-text">Page </span>57</span> <a class="page-numbers" href="?page_num=58"><span class="screen-reader-text">Page </span>58</a> <a class="page-numbers" href="?page_num=59"><span class="screen-reader-text">Page </span>59</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=58">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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