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3</a></p></header><div class="excerpt"><p>Automobile Engineering Interview Question and Answers Part 3
Automobile Engineering Basic Interview Question , quiz ,viva , oral Examination  Automobile Engineering Interview Q&amp;A :  Part 1...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/automobile-engineering-interview-question-and-answers-part-3/" aria-label="View Post: Automobile Engineering Interview Question and Answers Part 3">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Automobile Engineering Interview Question and Answers Part 3","url":"\/\/www.gunkrazy.com\/automobile-engineering-interview-question-and-answers-part-3\/","articleBody":"Automobile Engineering Interview Question and Answers Part 3\r\nAutomobile Engineering Basic Interview Question , quiz ,viva , oral Examination\r\n\r\n\r\nAutomobile Engineering Interview Q&amp;A :\u00a0 Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n\u00a072. What is the function of clutch?\r\n\r\nThe function of the clutch is to connect and disconnect the engine with road wheels. The clutch has to be disengaged during gear shifting, idling etc.\r\n\r\n73. What are the types of clutch?\r\n\r\nFriction clutches\r\n\u2022 Single plate clutch\r\n\u2022 Multi plate clutch\r\n\u2022 Cone clutch\r\n\u2022 Semi centrifugal clutch\r\n\u2022 Centrifugal clutch\r\n\r\nFluid clutches\r\n\u2022 Fluid flywheel\r\n\r\nClutch Parts\r\n\r\n74. State the requirements of an automotive clutch\r\n\r\na) Torque transmission should be maximum\r\nb) Gradual engagement of clutch plates\r\nc) Heat dissipation should be more\r\nd) Dynamic balancing of clutch components\r\ne) Vibration damping\r\nf) Size should be small\r\ng) Inertia should be low\r\nh) Clutch free pedal play should be sufficient\r\ni) Ease of operation\r\n\r\n75. What is the function of gear box? State its types.\r\n\r\nThe functions of the gearbox are\r\ni). To provide the leverage ratio\r\nii). To provide the neutral position\r\niii). To provide a means to reverse the vehicle.\r\n\r\nTypes\r\n\u2022 Sliding mesh gearbox\r\n\u2022 Constant mesh gearbox\r\n\u2022 Synchromesh gearbox\r\n\u2022 Automatic gearbox \u2013 Torque converter\r\n\r\n76. Why is gear box necessary in automobile?\r\n\r\n\u2022 The variation of resistance to vehicle motion at different speeds\r\n\u2022 The variation of tractive effort of the vehicle required at various speeds For above said reasons, a gearbox is necessary in an automobile\r\n\r\n77. What is tractive effort?\r\n\r\nIt is the force available at the road wheelsfor propelling the vehicle.\r\nT = \u00b5W\r\nWhere, T = Tractive effort\r\n\u00b5\u2013 Coefficient of friction between tyre and road surface\r\nW \u2013 Load of the vehicle\r\n\r\n78. Why is sliding mesh gear box not preferred?\r\n\r\n\u2022 More noise\r\n\u2022 More wear and tear on the gears\r\n\u2022 For smooth, quiet and quick change of gears, the driver requires great skill\r\nFor the above-said drawbacks, the sliding mesh gearbox is generally not preferred.\r\n\r\n79. What is automatic transmission?\r\n\r\nIn the automatic transmission, for changing the gear ratios, manual effort is not at all needed. The change of gear is performed automatically according to the vehicle speed.\r\n\r\n80. What is an over drive?\r\n\r\nWhen the speed of the output shaft is greater than the speed of the input shaft, then the drive is known as overdrive.\r\nExample: 0.8:1 or 0.9: 1\r\n\r\n81. What is a universal joint? What are its types?\r\n\r\nUniversal joint is a type of flexible joint between two shafts who axes intersect and may assume different inclinations at different times. It is used to transmit power even at inclined angles of the shaft.\r\n\r\nTypes\r\n\u2022 Yoke joint\r\n\u2022 Single cardan joint\r\n\u2022 Double cardan joint\r\n\u2022 Rag joint\r\n\u2022 Canfield joint\r\n\r\n82. State the functions of a slip joint.\r\n\r\nThe function of a slip joint is to accommodate the propeller shaft length variations, when a vehicle is moving over a bump or bit.\r\n\r\n83. What is the necessity of a propeller shaft?\r\n\r\nThe propeller shaft is used to transmit the power from the gearbox to the final drive. It is also used to cover the span between these two components.\r\n\r\n84. What is Hotchkiss drive and Torque Tube drive?\r\n\r\nIn Hotchkiss drive, the loads such as vehicle weight, driving torque, braking torque and side thrust all are taken by leaf springs. Two universal joints and one slip joint are must needed.\r\nIn Torque tube drive, the driving torque and braking torque are taken by torque tube while the vehicle weight and side thrust are taken care of by leaf springs. One universal joint is just sufficient.\r\n\r\n85. What is the function of differential unit?\r\n\r\nThe function of a differential unit is to permit the vehicle turns without wheel skidding. It permits higher speed for outer wheels and reduced speed for inner wheels during turning.\r\n\r\n86. What is the function of pressure plate in a clutch?\r\n\r\nThe function of a pressure plate is to hold the friction (clutch) plate tightly against the engine flywheel.\r\n\r\n87. What is meant by differential lock?\r\n\r\nA Differential lock will transmit the same amount of power to both wheels on the axle - which is very useful in 4WD applications where a truck might be stuck and have problems getting out of deep mud or snow.\r\n\r\n88. What is a fluid coupling?\r\n\r\nFluid coupling is device which transmits torque due to the kinetic energy of the moving fluid. In a fluid coupling, two members namely impeller and turbine are present.\r\n\r\n89. What is the use of torque convertor?\r\n\r\nThe torque converter is device which provides a varying torque ratio using fluid energy. In a torque converter, three members namely impeller, turbine and stator are present.\r\n\r\n90. State the forces act on the rear axle\r\n\r\n\u2022 Shear force due to vehicle weight\r\n\u2022 Bending moment due to vehicle weight\r\n\u2022 Driving torque\r\n\u2022 Shear force due to side thrust\r\n\u2022 Bending moment due to side thrust\r\n\r\n91. What are the different types of rear axles?\r\n\r\n\u2022 Semi floating rear axle\r\n\u2022 Full floating rear axle\r\n\u2022 Three quarter floating rear axle\r\n\r\n92. What is the purpose of Stator in the Torque Converter?\r\n\r\nThe stator changes fluid flow between the turbine and pump and thus permits the torque\r\nmultiplication. Without a stator, a torque converter will simply act as a fluid coupling.\r\n\r\n93. Why Synchronizer is required in the automotive transmission system?\r\n\r\nSynchronizer is used to equalize the speed of two mating surfaces, before the contact is established. By doing so, wear &amp; tear and noise can be avoided.\r\n\r\n94. What is transfer box? Where it is used?\r\n\r\nThe transfer box is used to convert 2 wheel drive into 4 wheel drive. This is mainly used in hilly regions.\r\n\r\n95. Define wheel track and wheel base.\r\n\r\nThe distance between the tyre centers, mounted on the same axle is known as wheel track.\r\nThe wheelbase is the distance between the centers of the front and rear wheels\r\n\r\n96. Give a brief note on damper.\r\n\r\nIt is used to dampen the vibrations of the suspension springs. It is mostly used in independent suspension.\r\n\r\n97. Distinguish between disc brake with drum brake\r\n\r\ndisc brake and drum brake\r\n\r\n98. What is meant by bleeding of brakes?\r\n\r\nThe process of removing air from the hydraulic brakes is known as bleeding of brakes.\r\n\r\n99. Define steering gear.\r\n\r\nThe steering gear is used to convert the rotational movement of the steering wheel into linear movement of the steering linkage. Moreover it provides mechanical advantage.\r\n\r\n100. What are the different types of wheels?\r\n\r\n \tPressed steel disc wheels\r\n \tWire spoke wheels\r\n \tLight alloy casted wheels\r\n\r\n101. What is the purpose of Toe-in and Toe-out?\r\n\r\nThe purpose of providing a toe in and toe out is straight line stability of the vehicle, after negotiating a turn.\r\n\r\n102. What are the different types of tyres used in automobile?\r\n\r\n \tCross ply tyres \r\n \tRadial ply tyres\r\n \tBelted bias tyres\r\n\r\n103. What are the different types of springs used in suspension system?\r\n\r\n \tLeaf springs (Rigid axle suspension)\r\n \tCoil springs (Independent suspension)\r\n \tTorsion bar (Independent suspension)\r\n\r\n104. Define king pin inclination.\r\n\r\nThe tilt of the king pin from the vertical reference line is known as King Pin Inclination (KPI). It is also called as Steering Axis Inclination (SAI).\r\n\r\n105. Give the function of tyre?\r\n\r\n \tSupporting Vehicle Weight\r\n \tTransferring Traction &amp; Braking forces to the Road Surface\r\n \tChanging &amp; Maintenance Direction of Travel\r\n \tAbsorbing Road shocks\r\n\r\n106. Define castor and camber.\r\n\r\nCastor: The tilt of the king pin from the vertical reference line when viewed from side is known as castor.\r\nCamber:The camber angle is the inward or outward tilt of the wheel relative to the vertical reference\r\n\r\n107. What are the benefits of anti-lock brake system?\r\n\r\n \tPreventing the wheel from locking at the time of braking\r\n \tKeeping the wheel rotating\r\n \tDue to rotating wheel, it helps you to steer away the vehicle from the object, while applying brakes at the same time.\r\n \tIt is even more effective in sand, snow, water, and mud where loss of traction is even higher, as on these surfaces, with normal braking system, it is even easier to lock wheels and loose traction but ABS works excellent in these conditions also and stops the vehicle in a much shorter distance.\r\n\r\n108. What is steering ratio?\r\n\r\nThe steering ratio is defined as the ratio of angle turned on the steering wheel to the angle turned by the stub axle.\r\n\r\n109. What is toe in and toe out?\r\n\r\nThe distance between the front ends of wheels is less than the rear end, the condition is said to be toe-in. The distance between the front ends of wheels is more than the rear end, the condition is said to be toe out.\r\n\r\n110. What are the types of steering gear box?\r\n\r\na) Worm &amp; Worm wheel steering gear\r\nb) Worm and Nut steering gear\r\nc) Worm and Roller steering gear\r\nd) Recirculating Ball steering gear\r\ne) Rack and Pinion steering gear\r\n\r\n\r\nAutomobile Engineering Interview Q&amp;A :\u00a0 Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nAutomobile Engineering Parts and System Notes , Article\r\nAutomobile Trends , News articles , Notes\r\nLatest seminar topic index - Report ,PPT Download\r\nMechanical Subjectwise Basic Concept Notes ,Articles\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":"Automobile Engineering Interview Question and Answers Part 3","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-25","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/disc-brake-and-drum-brake-300x46.jpg","height":46,"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/automobile-engineering-interview-question-and-answers-part-2/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/05/battery-coil-ignition-vs-magneto-ignition-system-300x70.png')"></div><span class="sr-only">link to Automobile Engineering Interview Question and Answers Part 2</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/automobile-engineering-interview-question-and-answers-part-2/">Automobile Engineering Interview Question and Answers Part 2</a></p></header><div class="excerpt"><p>Automobile Engineering Interview Question and Answers Part 2
Automobile Engineering Basic Interview Question , quiz ,viva , oral Examination   Automobile Engineering Interview Q&amp;A :  Part...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/automobile-engineering-interview-question-and-answers-part-2/" aria-label="View Post: Automobile Engineering Interview Question and Answers Part 2">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Automobile Engineering Interview Question and Answers Part 2","url":"\/\/www.gunkrazy.com\/automobile-engineering-interview-question-and-answers-part-2\/","articleBody":"Automobile Engineering Interview Question and Answers Part 2\r\nAutomobile Engineering Basic Interview Question , quiz ,viva , oral Examination\u00a0\r\n\r\n\r\nAutomobile Engineering Interview Q&amp;A :\u00a0 Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n39. What is Gasoline Direct Injection?\r\n\r\nThe gasoline (petrol) is directly into the cylinder at the end of compression stroke as such in diesel engines. This is called Gasoline Direct Injection (GDI)\r\n\r\n40. What is conventional ignition system?\r\n\r\nThe conventional ignition system gets its electrical voltage either from battery or dynamo, which will be boosted to a very high voltage due to which spark is produced in the cylinder to combust the mixture.\r\n\r\n41. Define common rail injection system.\r\n\r\nA common rail which is maintaining high fuel pressure is connected to individual fuel injectors of a multi cylinder engine.\r\n\r\n42. What is unit injection system?\r\n\r\nIt is an integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component\r\n\r\n43. What is a rotary distributor?\r\n\r\nThe rotary distributor has a rotating element, which releases a high intensity spark to the individual spark plugs according to the engine firing order.\r\n\r\n44. What is the function of a spark plug?\r\n\r\nThe spark plug is a device to produce electric spark to ignite the compressed air-fuel mixture inside the cylinder.\r\n\r\n45. What is an Electronic ignition system?\r\n\r\nThe ignition system, in which the mechanical contact points are replaced by electronic triggering and switching devices, is known as electronic ignition system.\r\n\r\n46. What are the functions of Turbo chargers?\r\n\r\n\u2022 To produce more power from the same size engine\r\n\u2022 To provide the altitude compensation\r\n\u2022 To improve more complete combustion &amp; hence less emissions\r\n\r\n47. Why the engine emissions to be controlled?\r\n\r\nSome of the engine emissions are carcinogenic. Moreover, the engine emissions led to green house effect. For these reasons, the engine emissions need to be controlled.\r\n\r\n48. What are the advantages of petrol injection?\r\n\r\n\u2022 High power can be developed\r\n\u2022 It has quick starting characteristics\r\n\u2022 It has lowest specific fuel consumption\r\n\u2022 Less engine emissions than carbureted engines\r\n\r\n49. What is super charging?\r\n\r\nThe process of increasing the density of inducted charge\/ air is known as supercharging. It is performed for the following reasons.\r\n\u2022 To produce more power from the same size engine\r\n\u2022 To provide the altitude compensation\r\n\u2022 To improve more complete combustion &amp; hence less emissions\r\n\r\n50. What is meant by carburetion in I.C engine?\r\n\r\nThe method of preparing the air-fuel mixture in an IC engine is known as carburetion. The device used for this purpose is known as carburetor\r\n\r\n51. What are the advantages of electronic fuel injection system over conventional injection?\r\n\r\n\u2022 Cold starting is easier\r\n\u2022 High fuel economy\r\n\u2022 Less engine emissions\r\n\u2022 Quick response to varying engine operating conditions\r\n\r\n52. What are the functions of generator and starting motor?\r\n\r\nThe function of the generator is to produce electricity to charge the battery. The starting motor is used to crank the engine during the starting condition.\r\n\r\n53. What is the function of an ignition system in I.C engine?\r\n\r\nThe function of an ignition system is to ignite the air-fuel mixture at the end of the compression stroke.\r\n\r\n54. State the requirements of ignition system? And state its types\r\n\r\n\u2022 It should consume minimum of power and produce high intensity spark across spark plug electrodes\r\n\u2022 It should have a sufficient spark duration which is sufficient to establish burning of air-fuel mixture under all operating conditions\r\n\u2022 It should provide sufficient ignition energy over the entire speed range of the engine\r\n\u2022 Good performance at high speed\r\n\u2022 Longer life of contact breaker points and spark plug\r\n\u2022 Adjustment of spark advance with speed and load\r\n\r\nTypes:\r\n\r\n \tBattery ignition\r\n \tMagneto ignition\r\n \tElectronic ignition\r\n\r\n55. What is the ignition advance?\r\n\r\nWhen the speed of the engine increases, the ignition timing also needs to be advanced for proper combustion. This process is known as ignition advance.\r\n\r\n56. What are the difference between battery coil ignition and magneto ignition system?\r\n\r\nbattery coil ignition vs magneto ignition system\r\n\r\n57. What is the sealed head lamp system?\r\n\r\nA sealed headlamp system is a type of unitized lamp with a parabolic reflector, one or more filaments and a glass or polycarbonate lens all permanently attached together and sealed.\r\n\r\n58. What is the function of carburetor?\r\n\r\nThe function of a carburetor is to prepare the air-fuel mixture according to the engine operating conditions.\r\n\r\n60. List the different methods of battery charging.\r\n\r\n\u2022 Constant current charging\r\n\u2022 Constant voltage charging\r\n\u2022 High rate charging\r\n\u2022 Slow rate charging\r\n\r\n61. State the principle of working of an A.C.Generator.\r\n\r\nThe basic principle of ac generator is electromagnetic induction when a coil of a conductor moves in a magnetic field the electrons in it starts moving because of attraction and repulsion of magnetic field. Thus, an emf is induced in it.\r\n\r\n62. In what respect does a Dynamo differ from an Alternator?\r\n\r\ni). Dynamo produces Direct Current (DC), while Alternator produced Alternating Current (AC) which can be converted to DC using rectifiers\r\nii). Alternator is lighter in construction than dynamo for the same output\r\n\r\n63. What is the purpose of Stator in the Torque Converter?\r\n\r\nThe stator resides in the center of the torque converter. Its job is to redirect the fluid returning from the turbine before it hits the pump again. This dramatically increases the efficiency of the torque converter.\r\n\r\n64. What are the components of lead acid battery?\r\n\r\n\u2022 Lead terminals\r\n\u2022 Electrolyte\r\n\u2022 Internal plates (positive and negative plates)\r\n\u2022 Resilient Plastic container\r\n\r\n65. What are the different types of starter motor drives?\r\n\r\n\u2022 Bendix drive\r\n\u2022 Overrunning drive\r\n\u2022 Outboard drive\r\n\r\n66. What are the chemicals used in battery?\r\n\r\n \tPbO2 \u2013 Positive plate\r\n \tPb \u2013 Negative plate\r\n \tElectrolyte \u2013 Diluted Sulphuric acid\r\n\r\n67. What is a dry charged battery?\r\n\r\nThe battery is built, charged, washed and dried, sealed, and shipped without electrolyte. It can be stored for up to 18 months. When put into use, electrolyte and charging are required\r\n\r\n68. What is the purpose of the grid?\r\n\r\nThe more \"plates\" in the grid, the more surface area exposed to the electrolyte, hence the more power produced.\r\n\r\n69. How will you distinguish a positive plate from a negative plate in a lead acid battery?\r\n\r\n \tThe positive plates are coated with PbO2 and chocolate brown in color\r\n \tThe negative plates are coated with spongy lead and grey in color.\r\n\r\n70. What is the function a cut out in a charging system?\r\n\r\nThe cut out permits the current flow from dynamo\/alternator to battery for charging while it does not permit the reverse flow of current.\r\n\r\n71. What is the function of regulators in a charging system?\r\n\r\n \tCurrent regulator \u2013 regulates the alternator\/dynamo current for charging the battery (constant current charging mode)\r\n \tVoltage regulator \u2013 regulates the alternator\/dynamo voltage for charging the battery (constant voltage charging mode)\r\n\r\n&nbsp;\r\n\r\n\r\n\r\nMore Resources \/articles\r\nAutomobile Engineering Parts and System Notes , Article\r\nAutomobile Trends , News articles , Notes\r\nLatest seminar topic index - Report ,PPT Download\r\nMechanical Subjectwise Basic Concept Notes ,Articles\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":"Automobile Engineering Interview Question and Answers Part 2","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-24","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/battery-coil-ignition-vs-magneto-ignition-system-300x70.png","height":70,"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/automobile-engineering-interview-question-and-answers-part-1/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/05/si-engine-vs-ci-engine-300x60.png')"></div><span class="sr-only">link to Automobile Engineering Interview Question and Answers Part 1</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/automobile-engineering-interview-question-and-answers-part-1/">Automobile Engineering Interview Question and Answers Part 1</a></p></header><div class="excerpt"><p>Automobile Engineering Interview Question and Answers Part 1
Automobile Engineering Basic Interview Question , quiz ,viva , oral Examination   Automobile Engineering Interview Q&amp;A :  Part...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/automobile-engineering-interview-question-and-answers-part-1/" aria-label="View Post: Automobile Engineering Interview Question and Answers Part 1">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Automobile Engineering Interview Question and Answers Part 1","url":"\/\/www.gunkrazy.com\/automobile-engineering-interview-question-and-answers-part-1\/","articleBody":"Automobile Engineering Interview Question and Answers Part 1\r\nAutomobile Engineering Basic Interview Question , quiz ,viva , oral Examination\u00a0\r\n\r\n\r\nAutomobile Engineering Interview Q&amp;A :\u00a0 Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\n1. What are the functions of a frame?\r\n\r\n\u2022 To support the chassis components and the body.\r\n\u2022 To withstand static and dynamic loads without undue deflection or distortion.\r\n\u2022 To carry the load of the passengers or goods carried in the body.\r\n\r\n2. List out the various materials used in the construction of chassis frames.\r\n\r\n\u2022 Low Carbon Steel - 0.18 or 0.20 % carbon content\r\n\u2022 High Carbon Steel - 0.25 % carbon content\r\n\u2022 Alloy Steel \u2013 With alloying elements like Ni &amp; Cr\r\n\r\n3. Write down any two main sections of vehicle construction.\r\n\r\n\u2022 Chassis construction\r\n\u2022 Body construction\r\n\r\n4. What are two types of vehicle suspensions?\r\n\r\n\u2022 Rigid axle suspension\r\n\u2022 Independent suspension\r\n\r\n5. What loads are coming to axle?\r\n\r\n\u2022 Vertical bending load due to vehicle weight\r\n\u2022 Driving torque\r\n\u2022 Braking torque\r\n\u2022 Side thrust\r\n\r\n6. What are the functions of a gear box?\r\n\r\n\u2022 It has to provide torque multiplication\r\n\u2022 It has to provide neutral position\r\n\u2022 It has to provide the means to reverse a vehicle\r\n\r\n7. Why you need a gear box?\r\n\r\nWhen a vehicle is moving on a road, it has to encounter different resistances depending upon the road surface, vehicle speed and road gradient. Hence, wheel torque required at road wheels is different for different operating conditions. To satisfy this requirement, a gearbox is necessary in a vehicle.\r\n\r\nRead more\u00a0Gearbox Design | Machine Design- Interview Question and Answers\r\n\r\nDesign And Fabrication of Six Speed Constant Mesh Gear Box\r\n\r\n8. Name the different kind of resistances to vehicle motion.\r\n\r\n\u2022 Air resistance\r\n\u2022 Rolling resistance\r\n\u2022 Gradient resistance\r\n\r\n9. Why is the frame narrow at front?\r\n\r\n \tThe frame is narrowed at the front to provide a better steering lock.\r\n \tThis also permits smaller turning circle radius \r\n\r\n10. List out the various materials used in the construction of vehicle body\r\n\r\n\u2022 Wood\r\n\u2022 Metals\r\n\u2022 Plastics\r\n\u2022 Mixed construction of all these materials\r\n\r\n11. Why are the side members of the frame upswept at two places?\r\n\r\nThe frame is upswept at the rear and front to accommodate the movement of the axles due to springing. It also keeps the chassis height low.\r\n\r\n12. What is the function of a bumper?\r\n\r\nA bumper is the front-most or rear-most part, which is designed to allow the vehicle to sustain an impact without damage to the vehicle's safety systems\r\n\r\n13. What are the stresses to which the frame members are subjected to?\r\n\r\n\u2022 Frame longitudinal members \u2013 bending stress\r\n\u2022 Frame side members \u2013 twisting stress\r\n\r\n14. Name few components of engine.\r\n\r\n\u2022 Cylinder block\r\n\u2022 Cylinder head\r\n\u2022 Crankcase\r\n\u2022 Cylinder\r\n\u2022 Piston\r\n\u2022 Connecting rod\r\n\u2022 Crankshaft\r\n\u2022 Camshaft\r\n\u2022 Valves\r\n\u2022 Spark plug (in the case of petrol engine)\r\n\u2022 Fuel injector (in the case of diesel engine)\r\n\r\nRead more :\u00a0IC engine Major Parts and Its Function, Materials,Images,Manufacturing Method.\r\n\r\n15. What are the types of frames?\r\n\r\n\u2022 Ladder type frame\r\n\u2022 Perimeter type frame\r\n\u2022 X type frame\r\n\u2022 Backbone type frame\r\n\r\n16. What is meant by self-propelled vehicle?\r\n\r\nA self propelled vehicle is known as an \u201cAutomobile\u201d\r\n\r\n17. List the various manufacturers of automobile products in India.\r\n\r\n\u2022 Maruti, Hyundai, Nissan, Ford \u2013 Passenger Vehicles\r\n\u2022 Tata, Ashok Leyland \u2013 Heavy Commercial Vehicles\r\n\u2022 Bajaj, Hero Honda, TVS Suzuki \u2013 Two Wheelers\r\n\u2022 Bajaj, Mahindra \u2013 Three Wheelers\r\n\r\n18. State the major types of automobiles according to the fuel used.\r\n\r\n\u2022 Petrol Engines (SI engines)\r\n\u2022 Diesel Engines (CI engines)\r\n\u2022 Gas Engines (either SI or CI mode)\r\n\r\n19. Classify automobiles with respect to the drive of the vehicle.\r\n\r\n\u2022 Front wheel drive\r\n\u2022 Rear wheel drive\r\n\u2022 All four wheel drive\r\n\u2022 Left hand drive\r\n\u2022 Right hand drive\r\n\r\n20. What is meant by the term Chassis?\r\n\r\nA complete vehicle without a body structure is known as Chassis. It comprises of basic structure, power unit, transmission system, controls and auxiliaries.\r\n\r\n21. How automobiles are classified into different types?\r\n\r\n\u2022 Based on Make &amp; Model\r\n\u2022 Based on Fuel\r\n\u2022 Based on Body Style\r\n\u2022 Based on No. of Wheels\r\n\u2022 Based on Drive\r\n\u2022 Based on Transmission\r\n\r\n22. What are the two types of cylinder liners?\r\n\r\n\u2022 Dry liners\r\n\u2022 Wet liners\r\n\r\n23. What are the functions of piston rings?\r\n\r\nTo provide a gas tight seal between the piston and cylinder liner to prevent the escape of gases from top side of the piston to the underside.\r\n\r\n24. What are the two types of piston rings?\r\n\r\n\u2022 Compression rings\r\n\u2022 Oil rings\r\n\r\n25. What are the different methods of engine cooling?\r\n\r\n\u2022 Air cooling \u2022 Oil (or) Water cooling\r\n\r\n26. What are the advantages of air-cooled engines?\r\n\r\n\u2022 Less weight-power ratio\r\n\u2022 Does not require radiator and water pump\r\n\u2022 No antifreeze agents required\r\n\u2022 No salt and mud deposits in the system\r\n\u2022 Air cooled engines are cheaper\r\n\r\n27. What are the components of water cooling method?\r\n\r\nWater pump, radiator tube, upper tank, lower tank, thermostat valve etc.\r\n\r\n28. State the difference between S.I and C.I engine.\r\n\r\nsi engine vs ci engine\r\n\r\n29. What is clearance volume? And what are its effects?\r\n\r\nThe volume above the piston, when it reaches TDC is known as clearance volume. The clearance volume is inversely proportional to the compression ratio.\r\n\r\n30. What is the function of piston, connecting rod, crank shaft and cylinder head?\r\n\r\n\u2022 Piston \u2013 The piston assembly transfers the force from the power stroke to the crankshaft\r\n\u2022 Connecting rod \u2013 converts reciprocating motion of piston into rotary motion of crankshaft\r\n\u2022 Cylinder head \u2013 it acts as a top cover to the cylinder block. The valves are placed in the cylinder head in an overhead valve engine.\r\n\r\n31. What is the purpose of cooling system?\r\n\r\nThe purpose of cooling system is to cool the engine components in order to keep their temperature below certain limit and thereby avoiding excessive thermal stress in those components.\r\n\r\n32. State the merits and demerits of air and water cooling system.\r\n\r\nAir Cooling\r\nMerits\r\n1. Less weight-power ratio\r\n2. Does not require radiator and water pump\r\n3. No antifreeze agents required\r\n4. No salt and mud deposits in the system\r\n5. Air cooled engines are cheaper\r\n\r\nDemerits\r\n1. Cooling efficiency is lower\r\n2. Non uniform cooling\r\n3. Engines are noisier.\r\n4. It needs impellor or blower to blow air over the fins.\r\n\r\nWater Cooling\r\n\r\nMerits\r\n1. Cooling efficiency is better\r\n2. More uniform cooling\r\n3. Engine operation is silent in nature\r\n4. It does not need an impeller or blower\r\n\r\nDemerits\r\n1. More number of components like radiator, water pump\r\n2. Antifreeze agents needed (Ethylene Glycol, Methanol)\r\n3. More salt and mud deposition in the system\r\n4. Engines are costlier\r\n\r\n33. What is the purpose of lubricating system? State its types.\r\n\r\nThe purpose of lubrication system is to supply the lubricating oil between the moving parts of the engine in order to\r\n\r\n1. Reduce the friction\r\n2. Provide the cooling effect\r\n3. carry away the deposits formed due to wear and tear.\r\n\r\nTypes: -\r\n\r\n\u2022 Mist lubrication\r\n\u2022 Splash lubrication\r\n\u2022 Pressure feed lubrication\r\n\u2022 Combined splash &amp; pressure feed lubrication.\r\n\r\nRead more :\u00a0Engine Lubrication System | Working Principle , Types and Components\r\n\r\n34. What is meant by turbo charging?\r\n\r\nIncreasing the density of inducted charge\/air by using a compressor which gets its power from exhaust driven turbine is known as Turbo charging.\r\n\r\n35. What are the various pollutants in I.C engine?\r\n\r\n\u2022 HC\r\n\u2022 CO\r\n\u2022 NOx\r\n\u2022 Particulates\r\n\u2022 SO2\r\n\u2022 CO2\r\n\r\n36. What is meant by P.C.V? And what are its effects?\r\n\r\nPCV \u2013 Positive Crankcase Ventilation\r\nIt is used to reduce the blow-by and thereby unburned hydrocarbon emissions\r\n\r\n37. What is a Catalyst?\r\n\r\nCatalyst is a chemical substance which increases the rate of chemical reaction. Examples are Platinum, Palladium and Rhodium.\r\n\r\n38. Write down the firing order a 4 cylinder and 6 cylinder engine\r\n\r\n4 cylinder engine firing order: 1-4-3-2\r\n6 cylinder engine firing order: 1-5-3-6-2-4\r\n\r\nRead More :\u00a0Firing Order | Purpose , Firing order Of Different Engine\r\n\r\n&nbsp;\r\n\r\n\r\nAutomobile Engineering Interview Q&amp;A :\u00a0 Part 1 | Part 2 | Part 3 | Part 4\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nAutomobile Engineering Parts and System Notes , Article\r\nAutomobile Trends , News articles , Notes\r\nLatest seminar topic index - Report ,PPT Download\r\nMechanical Subjectwise Basic Concept Notes ,Articles\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":"Automobile Engineering Interview Question and Answers Part 1","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-24","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/si-engine-vs-ci-engine-300x60.png","height":60,"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/forging-and-foundry-process-interview-question-and-answers-part-4/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/05/foundry-processes-300x257.jpg')"></div><span class="sr-only">link to Forging and Foundry Process | Interview Question and Answers Part 4</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/forging-and-foundry-process-interview-question-and-answers-part-4/">Forging and Foundry Process | Interview Question and Answers Part 4</a></p></header><div class="excerpt"><p>Forging and Foundry Process | Interview Question and Answers Part 4
Forging and Foundry Process | Interview , Viva ,Oral Question and Answers  Forging and Foundry process : Part 1  | Part 2  |...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/forging-and-foundry-process-interview-question-and-answers-part-4/" aria-label="View Post: Forging and Foundry Process | Interview Question and Answers Part 4">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Forging and Foundry Process | Interview Question and Answers Part 4","url":"\/\/www.gunkrazy.com\/forging-and-foundry-process-interview-question-and-answers-part-4\/","articleBody":"Forging and Foundry Process | Interview Question and Answers Part 4\r\nForging and Foundry Process | Interview , Viva ,Oral Question and Answers\r\n\r\n\r\nForging and Foundry process : Part 1 \u00a0| Part 2 \u00a0| Part 3 \u00a0| Part 4\u00a0\r\n\r\n\r\n\r\n\r\n121. What do you mean by Baking sand?\r\n\r\nIt is the used sand which is left on the floor after the castings have been removed from the mould.\r\n\r\n122. What is Core sand?\r\n\r\nThe sand which carries a high silica content and Is used for making cores is known as core sand.\r\n\r\n123. What is Molasses sand?\r\n\r\nIt is sand which carries molasses as binder.\r\n\r\n124. Mention the advantage of Molasses sand.\r\n\r\nIt is very useful for making moulds of small castings having intricate shapes and thin sections.\r\n\r\n125. Which sand is called as Fat sand?\r\n\r\nFacing sand is called as Fat sand.\r\n\r\n126. What is the effect of sand grains on foundry sand.\r\n\r\nSand grains has a remarkable effect on the physical properties of the foundry sand.\r\n\r\n127. Mention the types of sand grain surfaces.\r\n\r\nSmooth, Conchoidal \/ rough surfaces.\r\n\r\n128. Why the Smooth sand grain surface is preferred?\r\n\r\nBecause such a surface renders higher permeability, sinter point and plasticity to the sand mass &amp; the percentage of binder required is also equally high.\r\n\r\n129. What are the different shapes of sand grains?\r\n\r\nThe commonly formed shapes are rounded, sub \u2013 angular, angular and compound.\r\n\r\n130. For light castings which type of foundry sand is preferred?\r\n\r\nLight or fine grained sand is used.\r\n\r\n131. For bench work which type of foundry sand is preferred?\r\n\r\nA medium grained sand is preferred.\r\n\r\n132. For large iron and steel castings which type of foundry sand is used?\r\n\r\nHeavy or close sand is used. This sand should carry a high silica content, strong bond and low proportion of time.\r\n\r\n133. What is the purpose of adding Binders to the foundry sand?\r\n\r\nThe purpose of adding a binder to the moulding sand is to impart it sufficient strength and cohesiveness so as to enable it to retain its shape after the mould has been rammed and the pattern withdrawn.\r\n\r\n134. Name the common binders used in foundry ?\r\n\r\n1. Organic binders\r\n2. Inorganic binders.\r\n\r\n135. List the commonly used Organic binders.\r\n\r\n1. Destrin\r\n2. Molasses\r\n3. Linseed oil\r\n4. cereal binders\r\n5. Resins, like phenol and urea formaldehydes.\r\n\r\n136. List the commonly used inorganic binders\r\n\r\n1. Bentonite\r\n2. Kaoloite\r\n3. Limonite\r\n4. Ball clay\r\n5. Fire clay\r\n6. Fuller\u2019s earth.\r\n\r\n137. Which is the most widely used inorganic binders ?\r\n\r\nBentonite is the most widely used inorganic binder.\r\n\r\n138. What are Additives related to foundry ?\r\n\r\nAdditives are those materials which are added to the moulding sand to improve upon some of its existing properties or to impart certain new properties to it.\r\n\r\n139. List commonly used Additivies.\r\n\r\n1. Coal dust\r\n2. Sea coal\r\n3. Cereals or cornflour\r\n4. Silica flour\r\n5. Wood flour\r\n6. Pitch\r\n7. Dexirin and mollases\r\n8. Fuel oil\r\n\r\nfoundry processes\r\n\r\n140. Where Coal dust additives are used?\r\n\r\nIt is mainly used in the sand used for grey iron and malleable iron castings.\r\n\r\n141. Mention the main purpose of using coal dust additives?\r\n\r\nIts main purpose is to react chemically with the oxygen present in the sand pores and, thus, produce a reducing atmosphere at mould \u2013 metal interface &amp; prevent oxidation of the metal\r\n\r\n142. What is Sea coal?\r\n\r\nIt is a finely ground soft coal.\r\n\r\n143. What is the nature of Sea coal?\r\n\r\nIt restricts the mould wall movement and improves surface finish. It reduces permeability and hot strength of the mould and requires a higher percentage of water in the sand.\r\n\r\n144. What is Pitch additives?\r\n\r\nIt is used to improves hot strength and surface finish on ferrous castings.\r\n\r\n145. What is the role of Water on foundry sand?\r\n\r\nClay content added to the foundry sand will not give the required strength and bond until a suitable quantity of water is added to it.\r\n\r\n146. Mention the quantity of water added to foundry sand.\r\n\r\nQuantity of water varies from 2 \u2013 8% according to different requirements.\r\n\r\n147. What is the necessitity of testing Foundry sand?\r\n\r\nThe moulding sand is expected to have a good properties. These properties depend upon the size and shape of sand grains, their distribution and the amount of the other constituents added to the sand. In order to control\r\nthese factors effectively a number of tests are performed .\r\n\r\n148. Name the Sand testing Equipments used in foundry laboratory.\r\n\r\n1. Laboratory Balance\r\n2. Sand Rammer\r\n3. Drying Oven\r\n4. A sieve shaker.\r\n\r\n149. Name the commonly performed tests on foundry test.\r\n\r\n1. Grain fineness test\r\n2. Moisture content test\r\n3. clay content test\r\n4. Test for permeability\r\n5. Refractoriness test\r\n6. Strength test\r\n7. Mould harness test\r\n8. Core hardness test\r\n9. Compacting factor test.\r\n\r\n150. Why Grain fineness test is conducted?\r\n\r\nThe grain size of the moulding sand provides a significant effect on its permeability. Grains of similar or uniform sizes increase permeability whereas those of different size increase compactness, i.e, reduce the\r\npermeability. The grain size should therefore, by properly controlled through adequate testing of the sand before use\r\n\r\n151. Mention the methods used to test grain fineness?\r\n\r\n1. Boswell method\r\n2. Mechanical Sieve shaker method.\r\n\r\n152. Why Moisture content test is necessary?\r\n\r\nExcess moisture reduces permeability and too low moisture content reduces strength. Also many other defects in castings may occur on account of unbalanced proportion of moisture content or its uneven distribution. As such the testing of moisture content is invariably a must to control the same.\r\n\r\n153. Why Clay content test is essential?\r\n\r\nClay is the principal binder used in most foundry sands. It may be present in the natural sands or may be added to it. It considerably affects the strength and other properties and hence the determination of its quantity\r\npresent in the sand is necessary.\r\n\r\n154. Name the equipment used to conducted Moisture content test.\r\n\r\nA very simple type of instrument, offered by M\/s Metrimpex, Budapest, called a Rapid Moisture teller.\r\n\r\n155. Name the equipment used to conducted Clay content test.\r\n\r\nThe apparatus used for this purpose is Mud \/ Clay content tester.\r\n\r\n156. Why Permeability test is essential?\r\n\r\nIn order to allow the escape of steam and gases formed inside the mould when molten metal is poured into the latter. Permeability depends on the shape &amp; size of sand grains, moisture content and clay content of the sand. It is also affected by the degree of ramming of the mould sand.\r\n\r\n157. Name the equipment used to conducted Permeability test.\r\n\r\nApparatus called as Permeability meter or Permeability test.\r\n\r\n158. Give the formulae used to determine Permeability number.\r\n\r\nP = Vh\/ p.a.t\r\nWhere, P = Permeability number\r\nV = Volume in c.c of the air passing through the specimen\r\nh = Height of specimen in cm.\r\np = Air pressure\r\na= Area of cross-section of the specimen in sq.cm\r\nt = Time in minutes, taken by the air to pass.\r\n\r\n159. Why Refractoriness test is necessary ?\r\n\r\nThe extent to which this property is required in a moulding sand depends on the pouring temperature of the molten metal and the wall thick ness of the casting to be made. The refractoriness of a particular sand is determined by its sintering temperature.\r\n\r\n160. What do you mean by Strength test of Moulding sand?\r\n\r\nMoulding sands are usually tested for their shear strength, tensile strength, compression strength and bending strength. A well designed apparatus, called the strength tester, is used to perform these tests.\r\n\r\n\r\nForging and Foundry process : Part 1 \u00a0| Part 2 \u00a0| Part 3 \u00a0| Part 4\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nTechnical Mechanical Interview Question and Answers\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nManufacturing Technology Notes , Articles\r\nLatest seminar topic index - Report ,PPT Download\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Forging and Foundry Process | Interview Question and Answers Part 4","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-23","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/foundry-processes-300x257.jpg","height":257,"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/forging-and-foundry-process-interview-question-and-answers-part-3/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/05/types-of-rammer.jpg')"></div><span class="sr-only">link to Forging and Foundry Process | Interview Question and Answers Part 3</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/forging-and-foundry-process-interview-question-and-answers-part-3/">Forging and Foundry Process | Interview Question and Answers Part 3</a></p></header><div class="excerpt"><p>Forging and Foundry Process | Interview Question and Answers Part 3
Forging and Foundry Process | Interview , Viva ,Oral Question and Answers  Forging and Foundry process : Part 1  | Part 2  |...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/forging-and-foundry-process-interview-question-and-answers-part-3/" aria-label="View Post: Forging and Foundry Process | Interview Question and Answers Part 3">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Forging and Foundry Process | Interview Question and Answers Part 3","url":"\/\/www.gunkrazy.com\/forging-and-foundry-process-interview-question-and-answers-part-3\/","articleBody":"Forging and Foundry Process | Interview Question and Answers Part 3\r\nForging and Foundry Process | Interview , Viva ,Oral Question and Answers\r\n\r\n\r\nForging and Foundry process : Part 1 \u00a0| Part 2 \u00a0| Part 3 \u00a0| Part 4\u00a0\r\n\r\n\r\n\r\n\r\n81. List the Hand tools used in Foundry.\r\n\r\nShoel, Hand riddle, Rammers, Strike off bar, Towels, Slicks, Lifters or cleaners, Drag Spike, Draw screws and rapping plate, Smoothers and corner slicks, Mallet, Swab, Sprue pin, Sprue cutter, Goggers, Bellow.\r\n\r\n82. What is the function of Hand riddle?\r\n\r\nUsed for hand riddling of sand to remove foreign material from it.\r\n\r\n83. What is a Rammer?\r\n\r\nRammers are used for striking the sand mass in the moulding box to pack it uniformly around the pattern.\r\n\r\n84.Give the classification of Rammer.\r\n\r\n1. Peen rammer\r\n2. Hand rammer\r\n3. Floor rammer\r\n\r\ntypes of rammer\r\n\r\n85. What is the use of Vent wire in foundry?\r\n\r\nIt is a thin steel rod. After ramming and striking off the excess sand it is used to make small holes, called vents, in the sand mould to allow the exit of gases and steam during casting.\r\n\r\n86. What is a Mallet?\r\n\r\nIn foundry work it is used for driving the draw spike into the pattern and the rapping it.\r\n\r\n87. What is a Swab?\r\n\r\nIt is a hemp fibre brush used for moistening the edges off sand mould, which are in contact with the pattern surface, before withdrawing the pattern.\r\n\r\n88. What is the use of sprue cutter?\r\n\r\nIt is used to produce the hole after ramming the mould. It is in the form of a tapered hollow tube.\r\n\r\n89. What are Goggers?\r\n\r\nBent of pieces wires and rods which are used for reinforcing the downward projecting sand mass I the cope.\r\n\r\n90. What is the use of Bellow?\r\n\r\nUsed to blow but the loose or unwanted sand from the surface and cavity of the mould.\r\n\r\n91. Mention the use of Trowels?\r\n\r\nUsed for finishing flat surfaces and joints in a mould.\r\n\r\n92. What are Slicks?\r\n\r\nThey are used for repairing &amp; finishing the mould surfaces &amp; edges after\r\n\r\n93. Which is the commonly used Slick?\r\n\r\nThe commonly used slicks are Heart &amp; Leaf, Square &amp; Heart, Spoon &amp; Bead, Heart &amp; Spoon.\r\n\r\n94.List the containers used in foundry.\r\n\r\n1. Moulding boxes or flasks\r\n2. Ladles\r\n3. Crucibles.\r\n\r\n95. Mention the material of moulding boxes.\r\n\r\nMade of Wood, Cast iron or steel.\r\n\r\n96. Why Dry sand moulds always require metallic boxes?\r\n\r\nBecause dry sand moulds are heated for drying.\r\n\r\n97. Why the Ladles are used?\r\n\r\nThey are used to receive molten metal form the melting furnace and pour the same into the mould.\r\n\r\n98. What is the capacity of ladles?\r\n\r\nIt\u2019s capacity ranges from 30 kg \u2013 1000 kg.\r\n\r\n99.Why we required Crucibles?\r\n\r\nThey are similar in shape to the ladles. They are used as metal melting pots.\r\n\r\n100. Define Moulding Machines.\r\n\r\nIs device which, by means of large number of correlated internal parts and mechanisms, transmits &amp; directs various forces &amp; motions in required directions so as to help the preparation of a sand mould.\r\n\r\n101. What are the Functions of moulding machines.?\r\n\r\n1. Ramming of moulding sand\r\n2. Rolling over or inverting the mould\r\n3. Rapping the pattern.\r\n4. Withdrawing the pattern from the mould.\r\n\r\n102. Mention the types of moulding machines.\r\n\r\n1. Jar \/ Jolt machine\r\n2. Squeezer machine\r\n3. Jolt \u2013 Squeezer machine\r\n4. slinging machines or sand slingers.\r\n5. Diaphragm moulding machine\r\n\r\n103. Where we get the foundry sand?\r\n\r\nThe common sources of collecting foundry ands are rivers, lakes, sea and deserts.\r\n\r\n104. Give the main group of foundry sand.\r\n\r\n1. Natural sand\r\n2. Silica sand\r\n\r\n105. What are the constituent of Natural sand?\r\n\r\nIt contains sufficient amount of binding clay.\r\n\r\n106. What is silica sand?\r\n\r\nWhich do not possess the clay content and need addition of a suitable binder to make them usable for foundry work.\r\n\r\n107. Which is called as Sharp sand?\r\n\r\nSilica sand is called as sharp sand.\r\n\r\n108. Mention the common colours of sands used in foundry work.\r\n\r\nThey are White, Yellow, Brown, Grey &amp; Red.\r\n\r\n109. Mention the common sources of foundry sands in India?\r\n\r\n1. Damodar &amp; Barkar ares &amp; Raj mahal hills in Bihar\r\n2. Batala in Punjab\r\n3. Bhavnagar &amp; satara in maharastra\r\n4. Avadi &amp; Veeriyambkkam in Madras\r\n5. Hoogli in Bengal\r\n6. Rourkela in orissa.\r\n\r\n110. List the characteristics of Foundry sand.\r\n\r\n1. Refractoriness,\r\n2. Permeaability,\r\n3. Flowability or plasticity\r\n4. Adhesiveness\r\n5. Cohesiveness\r\n6. Collapsibility\r\n\r\n111. Explain Refractoriness of foundry sand?\r\n\r\nIt is that property of the moulding sand which enables it to withstand high temperatures of the molten metal without using thus facilitating a clean casting.\r\n\r\n112. Define Permeability of foundry sand.\r\n\r\nIt is also termed as porosity. It is the property of the sand which allows the gases and steam to escape through the sand mould.\r\n\r\n113. What do you mean by Flowability or plasticity\r\n\r\nIt is that property of the sand due to which it flows during ramming to all portions of the moulding flask. This increases with the addition of clay and water content and reduction of green strength and grain size.\r\n\r\n114. What is Adhesiveness of foundry sand?\r\n\r\nIt is that property of the sand due to which it is capable of adhering to the surfaces of other materials.\r\n\r\n115. Define Cohesiveness of foundry sand?\r\n\r\nIt is that property of the sand due to which its rammed particles bind together firmly and the pattern is withdrawn from the mould without damaging the mould surfaces and edges.\r\n\r\n116. What is collapsibility of foundry sand?\r\n\r\nIt is the property due to which the sand mould automatically collapses after solidification of the casting to allow a free contraction of metal.\r\nMention the Terminology of foundry sand.\r\n1. Green sand\r\n2. Dry sand\r\n3. Facing sand\r\n4. Parting sand\r\n5. Floor. Black or baking sand\r\n6. Core sand\r\n7. Oil sand\r\n8. Molasses sand\r\n\r\n117. What is Green sand?\r\n\r\nIt is also known as tempered sand. Which contains just enough moisture to give it sufficient bond. Moulds in this sand are known as green sand moulds.\r\n\r\n118. What is Dry sand?\r\n\r\nIt is a mouldiang sand which was originally having excess moisture content but the same has been evaporated from it by drying its mould in a suitable oven.\r\n\r\n119. What is the use of Facing sand?\r\n\r\nThis forms the facer of the mould, i.e, rammed around the pattern surface. It is nothing but the fresh prepared and well tempered foundry sand.\r\n\r\n120. What is Parting sand?\r\n\r\nThis sand is sprinkled on the pattern and the parting surfaces of the mould so that the sand mass of one flask does not stick to that of the other or the pattern.\r\n\r\n&nbsp;\r\n\r\n\r\nForging and Foundry process : Part 1 \u00a0| Part 2 \u00a0| Part 3 \u00a0| Part 4\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nTechnical Mechanical Interview Question and Answers\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nManufacturing Technology Notes , Articles\r\nLatest seminar topic index - Report ,PPT Download\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Forging and Foundry Process | Interview Question and Answers Part 3","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-23","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/types-of-rammer.jpg","height":179,"width":282},"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/forging-and-foundry-process-interview-question-and-answers-part-2/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/05/Forgeable-Material-300x77.jpg')"></div><span class="sr-only">link to Forging and Foundry Process | Interview Question and Answers Part 2</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/forging-and-foundry-process-interview-question-and-answers-part-2/">Forging and Foundry Process | Interview Question and Answers Part 2</a></p></header><div class="excerpt"><p>Forging and Foundry Process | Interview Question and Answers Part 2
Forging and Foundry Process | Interview , Viva ,Oral Question and Answers  Forging and Foundry process : Part 1  | Part 2  |...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/forging-and-foundry-process-interview-question-and-answers-part-2/" aria-label="View Post: Forging and Foundry Process | Interview Question and Answers Part 2">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Forging and Foundry Process | Interview Question and Answers Part 2","url":"\/\/www.gunkrazy.com\/forging-and-foundry-process-interview-question-and-answers-part-2\/","articleBody":"Forging and Foundry Process | Interview Question and Answers Part 2\r\nForging and Foundry Process | Interview , Viva ,Oral Question and Answers\r\n\r\n\r\nForging and Foundry process : Part 1 \u00a0| Part 2 \u00a0| Part 3 \u00a0| Part 4\u00a0\r\n\r\n\r\n\r\n\r\n41. Give the classification of Gas &amp; Oil fired furnace.\r\n\r\n1. Box type\r\n2. Semi-continuous or batch type\r\n3. Continuous furnace.\r\n\r\n42. Mention the fuels used in furnaces.\r\n\r\n1. Solid fuels: Eg. Coal, coke &amp; charcoal etc.\r\n2. Liqid fuels: Eg. They include different types of fuel oils\r\n3. Gaseous fuels: Eg. Natural gas and producer gas.\r\n\r\n43. Mention the forging temperature.\r\n\r\nTemperature generally ranging form 1200 \u2013 1350 degree C.\r\n\r\n44. What is the use of blowers in forging?\r\n\r\nEfficient and adequate supply of air at proper pressure is always a vital necessity for combustion of the fuel.\r\n\r\n45. Which type of Blowers are widely used?\r\n\r\nRoots blowers and centrifugal blower are widely used.\r\n\r\n46. Mention the forgeable materials\r\n\r\nAluminium &amp; Magnesium alloys, Copper, Brass &amp; Bronze, Mild steel, Wrought iron, Medium &amp; High carbon an d alloy steel, Stainless steels.\r\n\r\n47. Mention forgeable materials temperature \r\n\r\nForgeable Material\r\n\r\n48. List forging operation.\r\n\r\nUpsetting, Drawing out, cutting, Bending, Punching, Setting down and finishing, Welding.\r\n\r\n49. What do you mean by Upsetting or Jumping?\r\n\r\nIs the forging process through which the cross-section of a metal piece is increased with a corresponding reduction in its length. .\r\n\r\n50. What is Drawing out?\r\n\r\nIs also known as Drawing down. It is exactly a reverse process to tha of upsetting or jumping. Thickness is reduced with the increase in length.\r\n\r\n51. What if Setting down &amp; finishing in forging?\r\n\r\nSetting down is the operation through which the rounding of a corner is removed to make it square, by means of set hammer.\r\n\r\n52. What do you meant by Welding in forging?\r\n\r\nWelding in smithy is an imp. Operation carried out in this shop. Two pieces of the same metal which are to be joined together are heated in the hearth to the proper temperature. When they have acquired the welding heat they are withdrawn from the furnace and joined together by the application of external pressure, generally Hammering.\r\n\r\n53. What main considerations will you make in designing a forging?\r\n\r\n1. The forged component should ultimately be able to achieve a radial flow of grains or fibres.\r\n2. As far as possible, the parting line of a forging should lie in one plane.\r\n3. Sufficient draft on surfaces should be provided to facilitate easy removal of forgings from the dies.\r\n4. High &amp; thin ribs should not be designed.\r\n5. Too thin sections should be avoided to facilitate an easy flow of metal.\r\n\r\n54. Mention the furnaces for heat treatment.\r\n\r\n1. Hearth type\r\n2. Bath type\r\n\r\n55. What is the purpose of heat treatment?\r\n\r\nTo impart certain desired properties to metal so as to render it suitable for a particular use.\r\n\r\n56. What is Hardening?\r\n\r\nTo harden the metal to make it wear resitant and render it capable of cutting other metals.\r\n\r\n57. What is the purpose of Annealing?\r\n\r\nTo softening the metal.\r\n\r\n58. What is Tempering?\r\n\r\nGenerally followed after hardening to reduce brittleness, particularly in case of cutting tools.\r\n\r\n59. Mention the function of Normalising?\r\n\r\nFor refining the structure of the metal after cold working.\r\n\r\n60. What is case hardening?\r\n\r\nFor making a metal to have a hard outer surface with a comparatively soft but tough core.\r\n\r\n61.List the tools and equipment used in foundry.\r\n\r\nThey are, Hand tools, Containers, Mechanical tools, Sand testing &amp; conditioning equipment, Metal melting equipment, Fettling &amp; finishing equipment.\r\n\r\n62. List the Hand tools used in Foundry.\r\n\r\nShoel, Hand riddle, Rammers, Strike off bar, Towels, Slicks, Lifters or cleaners, Drag Spike, Draw screws and rapping plate, Smoothers and corner slicks, Mallet, Swab, Sprue pin, Sprue cutter, Goggers, Bellow.\r\n\r\n63. What are Power hammers?\r\n\r\nThe blows obtained by hand hammering will nt be sufficient enough to effect the proper plastic flow in medium or heavy forging. For this a power hammer is usually employed.\r\n\r\n64. What is the weight of these power hammers?\r\n\r\n200 kg hammer will be one of which the falling weight is 200kg. The heavier these parts and greater the height from which they fall, the higher will be intensity of blow the hammer will provide.\r\n\r\n65. List the common Power hammers in use.\r\n\r\nSpring power hammers, Pneumatic power hammers, Steam hammers and Drop or Forge hammers.\r\n\r\n66. What do you mean by Press forging?\r\n\r\nForging of parts by presses involves slow squeezing of plastic metal in closed impression dies, instead of applying repeated severe blows by hammers.\r\n\r\n67. Mention the types of Press forging.\r\n\r\n1. Hydraulic press\r\n2. Mechanical press\r\n\r\n68. Give an example to Roll forging.\r\n\r\nThis process is employed for producing long slender forged components. Eg. Axles, &amp; Leaf springs.\r\n\r\n69. Why forging defects occurs?\r\n\r\n1. Improper heating of component for forging\r\n2. Faulty die design\r\n3. Improper placement of metal in the die\r\n4. Forging operation not carried out properly.\r\n5. Faulty forging design.\r\n\r\n70. Why the forged parts are heat treated?\r\n\r\n1. To relieve internal stresses set up during working and cooling\r\n2. to normalize the internal structure of the metal\r\n3. To improve its Machinability\r\n4. To improve hardness, strength and other mechanical properties.\r\n\r\n71. Mention common heat treatments given to forged components.\r\n\r\nAnnealing, Normalising and Tempering. Are the common heat treatments given to forged components.\r\n\r\n72. What main considerations will you make in designing a forging?\r\n\r\n1. The forged component should ultimately be able to achieve a radial flow of grains or fibres.\r\n2. As far as possible, the parting line of a forging should lie in one plane.\r\n3. Sufficient draft on surfaces should be provided to facilitate easy removal of forgings from the dies.\r\n4. High &amp; thin ribs should not be designed.\r\n5. Too thin sections should be avoided to facilitate an easy flow of metal.\r\n\r\n73. Mention the furnaces for heat treatment.\r\n\r\n1. Hearth type\r\n2. Bath type\r\n\r\n74.. What is the purpose of heat treatment?\r\n\r\nTo impart certain desired properties to metal so as to render it suitable for a particular use.\r\n\r\n75. What is Hardening?\r\n\r\nTo harden the metal to make it wear resitant and render it capable of cutting other metals.\r\n\r\n76. What is the purpose of Annealing?\r\n\r\nTo softening the metal.\r\n\r\n77. What is Tempering?\r\n\r\nGenerally followed after hardening to reduce brittleness, particularly in case of cutting tools.\r\n\r\n78. Mention the function of Normalising?\r\n\r\nFor refining the structure of the metal after cold working.\r\n\r\n79. What is case hardening?\r\n\r\nFor making a metal to have a hard outer surface with a comparatively soft but tough core.\r\n\r\n80. List the tools and equipment used in foundry.\r\n\r\nThey are, Hand tools, Containers, Mechanical tools, Sand testing &amp; conditioning equipment, Metal melting equipment, Fettling &amp; finishing equipment.\r\n\r\n&nbsp;\r\n\r\n\r\nForging and Foundry process : Part 1 \u00a0| Part 2 \u00a0| Part 3 \u00a0| Part 4\u00a0\r\n\r\n\r\n\r\n\r\nMore Resources \/articles\r\nTechnical Mechanical Interview Question and Answers\r\nMachine Design Notes , article , Interview Que. and Ans.\r\nManufacturing Technology Notes , Articles\r\nLatest seminar topic index - Report ,PPT Download\r\nNew Mechanical Projects 2020 ( All Projects Post Index List )\r\n\r\n\r\n\r\n&nbsp;","headline":"Forging and Foundry Process | Interview Question and Answers Part 2","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-05-23","mainEntityOfPage":"False","dateModified":"February 18, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/05\/Forgeable-Material-300x77.jpg","height":77,"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> <nav class="pagination-wrapper" aria-label="article pagination"> <a class="prev page-numbers" href="?page_num=41">&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=40"><span class="screen-reader-text">Page </span>40</a> <a class="page-numbers" href="?page_num=41"><span class="screen-reader-text">Page </span>41</a> <span aria-current="page" class="page-numbers current"><span class="screen-reader-text">Page </span>42</span> <a class="page-numbers" href="?page_num=43"><span class="screen-reader-text">Page </span>43</a> <a class="page-numbers" href="?page_num=44"><span class="screen-reader-text">Page </span>44</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=43">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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