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1. 19 points

18 Mechanical Properties Which Every Mechanical Engineer Should Know

2. 12 points

Please reply Name Engineering college Location (City/ Country) Engineering Batch Engineering Company/ Dream company to work for Area of Interest Project undertaken Any other info you want to share
3. 10 points

Automotive Technology, 5th Edition James D. Helderman ppts

Version 1.1.0

A COMPLETE INSTRUCTOR AND STUDENT SUPPLEMENT PACKAGE - Continued These ppts are set of instructor and student supplements. . A FOCUS ON DIAGNOSIS AND PROBLEM SOLVING The primary focus of these ppts is to satisfy the need for problem diagnosis. Time and again, the author has heard that technicians need more training in diagnostic procedures and skill development. To meet this need and to help illustrate how real problems are solved, diagnostic stories are included throughout. Each new topic covers the parts involved as well as their purpose, function, and operation, and how to test and diagnose each system.
4. 9 points

What is difference between stress and pressure?

1. pressure represent intensity of external forces acting at a point. but stress represent intensity of internal resisting forces develop at a point.2. pressure is always acts normal to the surface. but but stress may also act either normal or parallel to the surface.3. magnitude of pressure at a point in all direction remain same. but magnitude of stress at a point in all the direction are unequal.4. pressure can be measure by using measuring device.like pressure gauge. but stress can't be measure directly by using any device.
5. 9 points

What is difference between stress and pressure?

Sirazz92 has given a fairly good answer. Pressure usually refers to a distributed external load applied to a body. Stress is the distributed internal loading associated with displacement under load. DrD
6. 8 points

Types of Welding

Welding is a process of joining similar and dissimilar metals or other material by application of heat with or without application of pressure and addition of filler material. It is used as permanent fasteners. Welding is essential process of every manufacturing industries. In fact, the future of any new metal may depend on how far it would lend itself to fabrication by welding. The weldability has been defined as the capacity of being welded into inseparable joints having specified properties such as definite weld strength proper structure. The weldability of any metal depends on five major factors. These are melting point, thermal conductivity, thermal expansion, surface condition, and change in microstructure. Types of welding: Basically welding may be classified into three types. 1. Plastic welding: In plastic welding or pressure welding process, the pieces of metal to be joined are heated to a plastic state and then forced together by external pressure. These welding are also known as liquid-solid welding process. This procedure is used in forge welding and resistance welding. 2. Fusion welding: In the fusion welding or no pressure welding process, the material at the joint is heated to a molten state and allowed to solidify. These welding are also known as liquid state welding process. This includes gas welding, arc welding, thermite welding etc. 3. Cold welding: In this welding process, the joints are produced without application of heat, but by applying pressure which results diffusion or inter-surface molecular fusion of the parts to be joined. It is also known as solid state welding process. This process is mainly used for welding nonferrous sheet metal, particularly aluminum and its alloys. This includes ultrasonic welding, friction welding, Explosive welding etc. 4 Main Welding Processes: 1. Arc Welding (Fusion Welding): In this type of welding process, weld metal melted from the edges to be joined and allow to solidifies from the liquid state and usually below the recrystallization temperature without any applied deformation. Arc welding is most extensively employed method of joining metal parts by fusion. In this welding the arc column is generated between an anode, which is the positive pole of power supply, and the cathode, the negative pole. When these two conductors of an electric circuit are brought together and separated for a small distance such that the current continues to flow through a path of ionized particles called plasma, an electric arc is formed. This ionized gas column acts as a high resistance conductor that enables more ions to flow from the anode to the cathode. Heat is generated as the ions strike the cathode. This heat used as melting of metal to be joined or melting the filler metal which further used as joining material of welding metal. The electrode is either consumable or non-consumable as per welding requirement. The temperature at the center of the arc being 6000 OC to 7000OC 2. Gas Welding: The gas welding is done by burning of combustible gas with air or oxygen in a concentrated flame of high temperature. As with other welding methods, the purpose of the flame is to heat and melt the parent metal and filler rod of a joint. It can weld most common materials 3. Gas Metal arc welding (MIG): This welding is also known as metal inert gas welding. In this type of welding a metal rod is used as one electrode, while the work being welded is used as another electrode. It is a gas shielded metal arc welding which uses the high heat of an electric arc between a continuously fed, consumable electrode wire and the material to be welded. Metal is transferred through protected arc column to the work. In this process the wire is fed continuously from a reel through a gun to constant surface imparts a current upon the wire. In this welding the welding area is flooded with a gas which will not combine with the metal. The rate of flow gas is sufficient to keep the oxygen of the air away from the hot metal surface while welding is being done. 4. Gas Tungsten Arc Welding (TIG): This welding is also known as tungsten inert gas welding is similar to the MIG in that is uses the gases for shielding. This arc welding process uses the intense heat of an electric arc between a no consumable tungsten electrode and the material to be welded. In this process the electrode is not consumable during welding process and gas is used to protect the weld area form atmospheric air.
7. 7 points

ANSYS Tutorial

Version

ANSYS offers engineering simulation solution sets in engineering simulation that a design process requires. Companies in a wide variety of industries use ANSYS software. The tools put a virtual product through a rigorous testing procedure (such as crashing a car into a brick wall, or running for several years on a tarmac road) before it becomes a physical object. This pdf gives good start to understand and learn ANSYS
8. 7 points

What is difference between stress and pressure?

Pressure is the force acting upon the surface of an body.(Action) Stress is the resisting force developed in a body when an external force acts on a body.(Reaction)
9. 7 points

What is 'CC' of a bike? How does it matter?

This is one important point missing in the two previous answers. The "cc rating" of an engine is a volume measure, as previously stated, but it is not the actual cylinder volume. Rather, it is the swept volume of the cylinder, also called the "displacement" of the cylinder. The actual cylinder volume is always somewhat greater than this value because the piston at TDC does not leave zero cylinder volume. The small volume remaining at TDC is called the "clearance volume," the volume available for the early stage of combustion. DrD
10. 5 points

Why tyres are made black in color?

Tyres are mixture of various rubbers with carbon black added. Carbon black improves traction and wear resistance of pure rubber. Another reason is that black color has higher absorption capability by which the tyre of any vehicle becomes adhesive to road
11. 5 points

Why should a chain drive be used over a belt or rope driven drive? State pro`s and con`s?

To allow slip and creep chain drive is used over belt or rope drive. To get accurate rotational timing a chain drive is best replacement for belt drive. Pro's of chain drive over belt drive 1) It can be used for accurate rotational timing thus used in I.C. Engines as timing chain. 2) There is no loss of energy in the form of heat because no slip and creep occurs. 3) Better service than belt drive. Con's of chain drive over belt or rope drive 1) Initial cost is more than belt drive system 2) Require proper lubrication for smooth functioning. 3) Not silent as belt drive in absence of lubrication. 4) Catches rust easily.
12. 5 points

Difference between pump and compressor

Basically a Pump is used for liquid or fluid to transform it to a much high pressure head while a Compressor is used for gases to transform from low to a much high pressure. From Mechanical Engineering point of view liquid is incompressible so Compressor cannot be used for liquid substances. Posted by AbdulQadir Abba Sheriff on linkedin
13. 4 points

How To Become An Expert

Mechanics Corner A Journal of Applied Mechanics and Mathematics by DrD © Machinery Dynamics Research, 2016 How To Become An Expert Introduction This is going to be another of those personal experience/opinion pieces, so if these bore you, be warned! This may be the time to click on something else. A reader recently wrote to me asking how to become an expert. I have to tell you, I don't spend much time thinking about being an expert, but I suppose on some reflection, the shoe probably fits. (Most of the time, I see myself as simply a tired old man, still enjoying the things I have done almost all my working life.) In the discussion below, I will describe a few events and observations that seem to relate to the question at hand. Find Your Place Nobody can hope to be an expert on everything, there is simply too much to know. You have to find the area that excites you, the area that really makes you want to dig in more. If you do not really enjoy it, you will never be an expert! I was very fortunate in this regard. When I was in High School, I was rather good in Mathematics, and my school advisers all told me, "You should become an engineer." Sadly, I really had no idea what that meant, and neither did they. The town where I grew up had rather little industry, and no one in my family knew an engineer of any sort. I did a little bit of research on engineering (this was thousands of years before the Internet), and it sounded interesting in a very vague way; there seemed to be little specific information available to me. But I went off to college, intending to study mechanical engineering, whatever that was. In my first semester of college, I took a Physics course in classical mechanics, and I really enjoyed it. This was exactly what I wanted to do, I just did not know the right name for it. I thought Newton's Second Law was the greatest thing ever discovered, and when implemented with Calculus, it was really fun. I was astounded at the power of it all, the questions that could be answered. If I could just get a job doing mechanics problems, I was sure I would be happy. HowToBecomeAnExpert.pdf
14. 4 points

State the difference between turbocharger and supercharger

State the difference between turbocharger and supercharger You can answer this question. You can like the best answer. You can share the question You can get updates of new questions on Facebook linkedin twitter & google plus
15. 4 points

What is difference between stress and pressure?

Well, not really. Stress is a second order tensor while vectors are first order tensors. Confused enough? How about if we say that stress requires a square matrix for full representation, while a vector can be fully represented by a single column (or row) matrix. To JAG above ... Well, you're no fun at all. I want to play as well. DrD
16. 4 points

17. 4 points

What is the purpose of using the governor in CI engine?

The purpose for a governor on at CI engine is the same as the purpose for a governor on any machine: to maintain constant speed under varying load conditions. DrD
18. 4 points

Define "Mechanical property" of engineering material

The mechanical properties of a material are those properties that involve a reaction to an applied load. The mechanical properties of metals determine the range of usefulness of a material and establish the service life that can be expected. Mechanical properties are also used to help classify and identify material. STRENGTH: The strength of a material is its ability to withstand an applied load without failure or plastic deformation.In machine design yield point or ultimate tensile / shear / compressive strength is used while designing. Stiffness: Stiffness is the rigidity of an object — the extent to which it resists deformation in response to an applied force. The complementary concept is flexibility or pliability: the more flexible an object is, the less stiff it is. Hardness: Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Some materials (e.g. metals) are harder than others (e.g. plastics). Elasticity: the ability of an object or material to resume its normal shape after being stretched or compressed. On a stress-strain diagram it is considered to be below proportional limit.But widely this point is taken as the yield point by drawing a line offset by 0.2% parallel to the straight line until it intersects the curve. Plasticity: It describes the deformation of a (solid) material undergoing non-reversible changes of shape in response to applied forces. Brittleness: A material is brittle if, when subjected to stress, it breaks without significant plastic deformation. Brittle materials absorb relatively little energy prior to fracture, even those of high strength.
19. 4 points

WHY DIESEL ENGINES ARE MORE EFFICIENT THAN PETROL ENGINE

Following are the reasonable points that conclude the high torque and efficiency of diesel engine. Diesel engine uses simple mechanism for combustion unlike in gasoline engine. Removal of ignition system not only makes the mechanism simpler but also reduces the risk of improper combustion due to damage in ignition system. In short burning of the fuel is easy and always accessible. This results in higher efficiency diesel engine. Diesel fuel is a heavier hydrocarbon in which carbon and hydrogen are strongly bonded with each other. And when energy is supplied in form of heat it gets explode releasing much higher energy then gasoline. In short diesel fuel has higher energy density then gasoline which results in huge explosion. One more factor for higher efficiency in diesel engine is its property of lubrication. Although all fuel has property of lubrication but diesel fuel has much higher lubrication then gasoline fuel. The compression ratio is much higher in diesel as compared to gasoline because in diesel engine air is alone compressed inside the cylinder and it’s a known fact that gas easily compresses then liquid. This is not so in gasoline engine because air-fuel mixture is compressed inside the cylinder. This higher compression gives higher heat and simultaneously higher torque. We can’t use Carnot cycle to get 100% efficiency but can use its principle to attain maximize efficiency. In diesel engine heat is added at constant pressure which results in higher utilization of heat energy to get maximize work output. These were the advantageous features of diesel engine but it has some demerits as well like it releases highly toxic gases, noisy, higher maintenance cost and starting problem (now starting problem is eliminated by using a bulb nearby to the cylinder) to heat the engine before ignition. And it is costlierthan gasoline engine but with optimum operation and good maintenance resolve all these problems.
20. 4 points

Explain why washers are used?

Washers are used when bolting to make stronger the joint and to reduce bolt fatigue due to inconsistent loads. Any stretch or flattening of parts is likely to be less than the compression of the washer thus, the bolt won't loosen much.
21. 3 points

What is the need of Pre-heating and Post heating in welding process?

Pre-heat is required for the following reasons: (1) It lowers the cooling rate in the weld metal and base metal, producing a more ductile metallurgical structure with greater resistant to cracking. (2) The slower cooling rate provides an opportunity for any hydrogen that may be present to diffuse out harmlessly without causing cracking. (3) It reduces the shrinkage stresses in the weld and adjacent base metal, which is especially important in highly restrained joints. (4) It raises some steels above the temperature at which brittle fracture would occur in fabrication. Post heating is required to remove further residual stresses present in the weld pool after heat treatment process also. If post heating is not done, then residual stresses develops as cracks and propagates throughout, resulting in the failure of the material. Also Preheat/Post weld heat treatment can be used to help ensure specific mechanical properties, such as notch and toughness.
22. 3 points

Share document Mechanical Eng

Hello! Today i share some document for Engineering. Visit at: https://dochelp.net/category/engineering/1.html
23. 3 points

Moment, Torque, Bending moment, Torsional moment

Moment is used particularly for static analysis and it results in bending. Torque is used particularly for dynamic analysis and it results in rotation. I hope this would be helpful.
24. 3 points

Moment, Torque, Bending moment, Torsional moment

To my knowledge Moment : it is the force applied to bend or rotate a body. Bending moment : amount of internal resistance offered towards bending. Torsion moment : amount of resistance towards twisting. Torque : it is the twisting or turning effect. Or it is the amount of force to twist or rotate a body.
25. 3 points

26. 3 points

List of Softwares used by Mechanical Engineers

One of the problems with many of these software packages mentioned above is their expense. If you work for company "A" where you get very proficient in software X, what happens when you take a position with company "B" that uses software Y? Presumably the software packages X and Y do similar things, but in their own formats, and they are not compatible. Further, if you want to work on something on the side, for your own interest, will you be able to use the company's software for your personal work? Years ago (before the end of the Ice Age), engineers all used slide rules, but every engineer provided his own slide rule at work. There were many different brands (K&E, Dietzen, Post, etc.) but they all worked about the same (some small variations), and they gave the same results. You could use your slide rule at work and on your home projects; it was yours. For this reason, I encourage people to use public domain software, rather than proprietary software. Several folks above have mentioned MatLab, but no one has mentioned SciLab. SciLab is public, available for free, and works just about like MatLab. Why do so few use public software? This baffles me. There are other similar situations regarding other types of software. DrD
27. 3 points

How many manholes should be there on boiler? Why?

Are you sure that this question has any answer other than "enough"? Do you think that there is a general answer that covers all cases? I really doubt that, but I certainly cannot answer your question. I'm anxious for you to post an answer. DrD PS: The answer to the "why?" part is simply to do whatever needs to be done.
28. 3 points

We want to start a new Job section for Mechanical engineers

To make available the listing of new appropriate jobs, we want to start a new section.... but before that we want to hear from you on the following points Your participation and reply to this post is important to take the decision to start the same. Which country are you staying in ? What type of job are you looking - Dream profile , dream company How much work experiemce do you have? Can you ask your current company's HR manager to post job openings on the site - This is very important Any suggestions and ideas do you have to get it started ?
29. 3 points

What is difference between stress and pressure?

I would like to add a story here. There are a limited number of units in this world. Different properties share the same units and combination of units though the meanings are VERY different, as DrD and sirazz92 explained. Two values that are very related are stress and modulus of elasticity (MoE). Both have the units of pounds per square inch. I once witnessed a complete misunderstanding of the relationship. The engineer, a very proficient ProE user when it came to building models, ran an FEA routine. He was under the mistaken belief that as long as the stress was below the MoE the load was ok. Dr D is now holding his head. The MoE for steels are usually taken as 30,000,000 psi. This is good enough for classroom work. When you are doing real world work you will find values vary, but not by large percentages. Some steels are very strong but I am not aware of any that yield or fail at 30,000,000 psi. On a somewhat related topic a group of us were discussing a stress issue and a question came up that also showed a lack of understanding the basics. I too had to stop and think for a while. Though I was long past confusing MoE with the strength of a material, a basic understanding had grown stale. QUESTION: If all steels have about 30,000,000 psi for MoE, how can they have different strengths? I would like to see answers from students and recent graduates. Dr D knows the answers all too well so he is not allowed to answer.
30. 3 points

31. 3 points

What is Engine? What are Main Types of Engine?

Any device which can convert heat energy of fuel into mechanical energy is known as engine or heat engine. Engine is widely used in automobile industries or we can say that engine is the heart of an automobile. Basically engine may be classified into two types. 1. External combustion (E.C.) Engine 2. Internal Combustion (I.C.) Engine Types of Engine: 1. External combustion (E.C.) Engine It is an engine in which combustion of fuel take place outside of the engine. In this type of engine heat, which is generated by burning of fuel is use to convert the water or other low boiling temperature fluid into steam. This high pressure steam used to rotate a turbine. In this engine we can use all solid, liquid and gases fuel. These engines are generally used in driving locomotive, ships, generation of electric power etc. Advantages of E.C. engine- In these engines starting torque is generally high. Because of external combustion we can use cheaper fuels as well as solid fuel. They are more flexible compare to internal combustion engines. 2. Internal Combustion (I.C.) Engine It is an engine in which combustion of fuel take place inside the engine. When the fuel burns inside the engine cylinder, it generates a high temperature and pressure. This high pressure force is exerted on the piston (A device which free to moves inside the cylinder and transmit the pressure force to crank by use of connecting rod), which used to rotate the wheels of vehicle. In these engines we can use only gases and high volatile fuel like petrol, diesel. These engines are generally used in automobile industries, generation of electric power etc. Advantages of I.C. engine- It has overall high efficiency over E.C. engine. These engines are compact and required less space. Initial cost of I.C. engine is lower than E.C. engine. This engine easily starts in cold because of it uses high volatile fuel. Types of I.C. Engine I.C. engine is widely used in automobile industries so it is also known as automobile engine. An automobile engine may be classified in many manners. Today I am going to tell you some important classification of an automobile engine. According to number of stroke: 1. Two Stroke Engine In a two stroke engine a piston moves one time up and down inside the cylinder and complete one crankshaft revolution during single time of fuel burn. This type of engine has high torque compare to four stroke engine. These are generally used in scooters, pumping sets etc. 2 Four Stroke Engine . In a four stroke engine piston moves two times up and down inside the cylinder and complete two crankshaft revolutions during single time of fuel burn. This type of engines has high average compare to two stroke engine. These are generally used in bikes, cars, truck etc. According to design of engine: 1. Reciprocating engine (piston engine) In reciprocating engine the pressure force generate by combustion of fuel exerted on the piston (A device which free to move in reciprocation inside the cylinder). So the piston starts reciprocating motion (too and fro motion). This reciprocating motion converts into rotary motion by use of crank shaft. So the crank shaft starts to rotate and rotate the wheels of vehicle. These are generally used in all automobile. 2. Rotary engine (Wankel engine) In rotary engine there is a rotor which frees to rotate. The pressure force generate by burning of fuel is exerted on this rotor so the rotor rotate and starts to rotate the wheels of vehicle. This engine is developed by Wankel in 1957. This engine is not used in automobile in present days. According to fuel used: 1. Diesel engine These engines use diesel as the fuel. These are used in trucks, buses, cars etc. 2. Petrol engine These engines use petrol as the fuel. These are used in bikes, sport cars, luxury cars etc. 3. Gas engine These engines use CNG and LPG as the fuel. These are used in some light motor vehicles. 4. Electric engine It is eco-friendly engine. It doesn’t use any fuel to burn. It uses electric energy to rotate wheel. According to method of ignition: 1. Compression ignition engine In these types of engines, there is no extra equipment to burn the fuel. In these engines burning of fuel starts due to temperature rise during compression of air. So it is known as compression ignition engine. 2. Spark ignition engine In these types of engines, ignition of fuel start by the spark, generate inside the cylinder by some extra equipment. So it is known as spark ignition engine. According to number of cylinder: 1. Single cylinder engine In this type of engines have only one cylinder and one piston connected to the crank shaft. 2. Multi-cylinder engine In this type of engines have more than one cylinder and piston connected to the crank shaft. According to arrangement of cylinder: 1. In-line engine In this type of engines, cylinders are positioned in a straight line one behind the other along the length of the crankshaft. 2. V-type engine An engine with two cylinder banks inclined at an angle to each other and with one crankshaft known as V-type engine. 3. Opposed cylinder engine An engine with two cylinders banks opposite to each other on a single crankshaft (V-type engine with 180o angle between banks). 4. W-type engine An engine same as V-type engine except with three banks of cylinders on the same crankshaft known as W-type engine. 5. Opposite piston engine In this type of engine there are two pistons in each cylinder with the combustion chamber in the center between the pistons. In this engine a single combustion process causes two power strokes, at the same time. 6. Radial engine It is an engine with pistons positioned in circular plane around the central crankshaft. The connecting rods of pistons are connected to a master rod which, in turn, connected to the crankshaft. According to air intake process: 1. Naturally aspirated In this types of engine intake of air into cylinder occur by the atmospheric pressure. 2. Supercharged engine In this type of engine air intake pressure is increased by the compressor driven by the engine crankshaft. 3. Turbocharged engine In this type of engine intake air pressure is increase by use of turbine compressor driven by the exhaust gases of burning fuel.
32. 3 points

What is Pattern? What are Different Types of Pattern?

Pattern is replica or model of object which to be created. It is used to make hollow cavity in sand mold in which molten metal is poured and allow solidifying to create object. The size and shape of cast object is highly depends of shape and size of pattern. Mostly pattern are made by aluminum, wood, wax etc. Metal pattern are used for mass production. The pattern making is most critical work in casting because the object is highly depended on it. A good pattern should follow following requirements. Low cost and easy to cast. Easy to repair. It should light in weight which make it easy to handle. It should able to withstand ramming forces without deformation. It should does not change its dimensions in presence of moisture. It should be easily removable from mould. It should have long life without change in its dimensions. Types of pattern: As we discussed, casting objects are highly depend on pattern. According to the shape and size of casting and method of making cavity, pattern can be classified as follow. Single Piece Pattern: It is simplest type of pattern which is made in single piece. It is used for simple objects. It is either placed into cope or in drag according to the simplicity of operation. It is used to cast stuffing box of steam engines. Split Pattern or Multi Piece Pattern: These patterns are made into two or more pieces. The first half of pattern placed into cope and other half into drag. It is used for complex objects where removal of single piece pattern from mould is impossible. When pattern is made in more than three parts cheeks are also used for easy removal. Cope and Drag Pattern: These are two piece split pattern as discussed above. It is used for large objects Match Plate Pattern: Match plate pattern is a split pattern in which cope and drag section mounted on opposite sides of a plate. The plate is known as match plate. These will make easy to cast any shape with high production rate. Mostly runner, gates etc. are also mounted on same plate which will easy to mould making work. These patterns are used for mass production. Loose Piece Pattern: When removal of pattern is impossible due to an extended surface at either upper half or lower half, the extended part made as loose piece so this extended part can be removed first before removal of whole pattern. This will make easy removal of pattern without effect on the cavity. These patterns are known as loose piece pattern. Gated Pattern: These are simply more than one looses piece which are attached with a common gating system. These are used for mass production. It is used to produce small size cavities into one mould. Sweep Pattern: These pattern are used for large rotational symmetrical casting. A sweep is a section of large symmetrical object which is rotated along a edge into sand which make a large symmetrical mould. These patterns makes easy pattern making work of large objects. Skeleton Pattern: These patterns used for large simple castings. In these patterns, skeleton like structure made by using simple pattern sections. These will save both time and material. Follow Board Pattern: Follow board is a wooden board which is used to support pattern during moulding. It acts as sit for pattern.
33. 3 points

Machine Design Quiz 1

To my mind, this quiz focused on mostly the wrong things. These are, for the most part, things that can easily be looked up in a design manual or a handbook. A much more interesting quiz would focus on the understanding and application of idea, the ability to correctly model systems, and the ability to understand and correctly interpret data. DrD
34. 3 points

What comes first stress or strain?What is stress

This is very much like asking which came first, the chicken or the egg! Without strain, you will have no stress. Without stress, you will have no strain. I can't see how it is possible to say one precedes the other. DrD
35. 3 points

36. 3 points

Pump Handbook

Version

The handbook is divided into 5 chapters which deal with different phases when designing pump systems. Chapter 1 Design of pumps and motors Chapter 2 Installation and performance reading Chapter 3 System hydraulics Chapter 4 Performance adjustment of pumps. Chapter 5 Life cycle costs calculation
37. 3 points

Name : Azhar Irfan Gull Engineering college: SSM College Of Engineering And Technology Location (City/ Country) : Srinagar, KASHMIR Engineering: 2014-2018 Engineering Company/ Dream company to work for: CAT, TATA, HITACHI. Area of Interest- Designing Any other info you want to share: AutoCad, Solidworks, Ansys.
38. 3 points

Machine Design II ppt

Version

Presentation on Design of- Clutch Brake Belts Chain Gears
39. 3 points

Explain why washers are used?

To protect the bolt hole, spread the load & forces evenly, as a spacer, protect the nut from crevice & galvanic corrosion.
40. 3 points

41. 3 points

What is the difference between Anti Lock Brake System (ABS) and Electronic Brake force Distributor (EBFD) in the braking ability of vehicle?

ABS- it allows the brakes to be applied while maintaining a tractive contact with the road. it does not allow the wheels to be stopped a once. if it was stopped at once due to inertia(because of the speed with which it comes), the vehicles skids. it is more prominent in low friction surfaces like on ice, wet road etc. In ABS the wheels are not stopped at once. It grips the disc mounted on the wheel. the disc is pressed and released with a gap of nanoseconds. thus the driver do not actually feel it. It increases the braking distance. EBD- It is an electronic device that is mounted on the vehicle, that actually varies the amount of braking force on each wheel depending upon the road conditions. if one wheel is on a high friction surface less braking force is required on that wheel. thus by sensing the road conditions the amount of brake force is varied.
42. 3 points

What is the function of over-drive(O/D) on an automatic gearbox? How does it work?

Ohh god.. No one is able to give right answer. All are copying from other sources.. Let’s discuss it with an example of bicycle. In bicycle while operation the power from pedal is transmitted to small flywheel present in the rear tyre. This flywheel locks in one direction so that power can be transmitted from pedal to rear wheel not from rear wheel to pedal. In order to conserve the kinetic energy of the bicycle. Same thing happens in vehicles. In normal conventional gear box when we release our accelerator pedal the kinetic energy of vehicle deploys as it is transmitted back to engine from wheels until we disengage the clutch. Thus an overdrive in an automatic transmission locks in one direction while transmitting power from engine to the wheels and rotates freely on reverse transmission of power from wheel to engine. This conserves the kinetic energy of vehicle for useful movement.
43. 3 points

What is DTSI Technology & DTS-Si Technology

In DTSi, instead of 1 we are using 2 spark plugs. Flame front formed is able to consume more air-fuel mixture as compared with 1 spark plug, thus more complete burning and more efficiency. in DTS-Si, with addition of 2nd spark plug, what they are doing is relocating valves position. With proper designing of inlet and outlet valves you can induce extra swirl for inoming air fuel mixture. Due to turbulence, extra efforts are provided for proper mixing of air and fuel. (We can not allow petrol to go in liquid droplet form, it should be finely atomized). With well atomized air fuel mixture, efficiency increases.
44. 2 points

WHY DIESEL ENGINES ARE MORE EFFICIENT THAN PETROL ENGINE

You know that diesel engine is the most appropriate choice of the engineers when it comes to drive heavy automobile like trucks, aircraft, ships etc. But what makes it so torque, is it the engine design, working cycle or something else. Please share your deep analysis to answer this questions
45. 2 points

CATIA  Complete Learning TUTORIALS: Please check for your reference.

CATIA Complete Learning TUTORIALS: Please check for your reference.
46. 2 points

Mechanical Engineering project Ideas

HEre's throwing you a bone.... How about floating windmills. You design windmills on a floating platform, much like offshore oil platform/rig. Consideration of the ocean wave and current... also the wind conditions.
47. 2 points

Version 1.1

48. 2 points