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## Popular Content

Showing most liked content since 03/16/2017 in all areas

1. 46 likes

## 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
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3. 30 likes

## 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
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## Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?

In second angle, both top and front view are drawn above the x-line whereas in fourth angle its vice versa. In second and fourth angle method, top view and front view overlaps. hence we never use those methods. In first angle method, front view lies above the x-line and top view lies below. vice versa for third angle. As both the views lies on either side of x-line in first & third angle, we make use of these methods.
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## Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?

To draw a projection of any object first we need to place this object in any quardrant then fit a source of light in front, above or any angle you want. A shadow will occur in the opposite side of the light source which will represent the projection of that object. Now after drawing this projection, the horizontal plane is to be rotated 90 degree clockwise. in second and fourth angle projection due to this process horizontal and vertical plane will overlap with each other. That's why we can't draw second and fourth angle projection.
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## Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?

Dear Sourabh, very good question. Just because of the norms we do this. We consider that horizontal plane rotates in clockwise direction after having projection on it. that's why we use 1st angle and 3rd angle projection. because only in this two quadrants we will get the both views after clockwise rotation of horizontal plane. Yes we can use second angle and fourth angle projection but in that case we need to rotate horizontal plane of projection in counterclockwise direction. Thus both 1st angle and 3rd angle projection will be replaced by 2nd angle and 4th angle projection.
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## What do you understand by performance test of IC Engine? How it is done ? We welcome your inputs in open discussion

The performance test of an IC engine is done to find out the power of the engine at various loading conditions and the fuel consumptions at various loads. The main parameters which are tested are 1.Indicated power 2.Brake power 3.frictional power 4.specific fuel consumption(sfc) when subjected to different loads. Further,tests can also be conducted to compute the surface temperature of the engine,oil/water needed to cool the engine.
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## Difference between pump and compressor

Well, a compressor compresses a gas and a pump moves a liquid. Compressors are often used in refrigeration applications where gas is transformed into a liquid, so the main task for the compressor is not to move the gas but to compress it to increase its pressure. But role of pump is for displacement of fluid (mainly liquid) by applying pressure.
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## EES (Engineering Equation Solver)

whel! I have Instalation files and user manual! If its intresting for you tell me to send 4 u!
10. 5 likes

## What is Difference between Hardness and Toughness?

Hardness: Hardness is the resistance of a material to localized deformation. The term can apply to deformation from indentation, scratching, cutting or bending. hardness commonly refers to a material's ability to penetrate softer materials. An object made of a hard material will scratch an object made of a softer material.In metals, ceramics and most polymers, the deformation considered is plastic deformation of the surface. For elastomers and some polymers, hardness is defined at the resistance to elastic deformation of the surface. The lack of a fundamental definition indicates that hardness is not be a basic property of a material, but rather a composite one with contributions from the yield strength, work hardening, true tensile strength, modulus, and others factors. Hardness measurements are widely used for the quality control of materials because they are quick and considered to be nondestructive tests when the marks or indentations produced by the test are in low stress areas. Toughness: The quality known as toughness describes the way a material reacts under sudden impacts. toughness is the resistance to fracture of a material when stressed. It is defined as the amount of energy that a material can absorb before rupturing, and can be found by finding the area (i.e., by taking the integral) underneath the stress-strain curve. It can be defined as the work required to deform one cubic inch of metal until it fractures. Toughness, often expressed as the Modulus of Toughness, is measured in units of joules per cubic meter (J/m3) in the SI system and pound-force per square inch (sometimes expressed as in-lb/in3) in US customary units. Toughness is measured by the Charpy test or the Izod test. Both of these tests use a notched sample. The location and shape of the notch are standard. The points of support of the sample, as well as the impact of the hammer, must bear a constant relationship to the location of the notch. Difference: The hardness of a metal limits the ease with which it can be machined, since toughness decreases as hardness increases Toughness is a combination of high strength and medium ductility. It is the ability of a material or metal to resist fracture, plus the ability to resist failure after the damage has begun. A tough metal, such as cold chisel, is one that can withstand considerable stress, slowly or suddenly applied, and which will deform before failure. Toughness is the ability of a material to resist the start of permanent distortion plus the ability to resist shock or absorb energy
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## What is the difference between casting & forging? Why use castings & why use forgings?

Casting is a process in which the metal is melted at high temperatures and then poured into a mould to give it the desired shape. There are many casting methods: Sand Casting, DIe Casting, Lost Wax casting. In casting process the newly formed shape sometimes needs extra machining to get the desired surface finish. The cast parts can also incorporate defects because of air bubbles and internal stresses. Casting have some issues with metal selection. All the metals are not suitable for casting. It is sometimes associated with blow, scar, scab etc. errors. Forging is also very old method. Blacksmiths used to do forging with the hammer and anvil from an ancient time. It is the process where metal is heated in different temperature ranges and then hammered to get the desired shape. Depending on the temperature forging can hot, cold or warm. While forging there is a change in the grain structure of the metal which consequently makes it more tough and wear resistant. There are very less porosity and shrinkage defects.
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## Continuously variable transmission

Version 1.0.0

This is CVT ppt which is used in Scootie and all terrain vehicle car.
13. 4 likes

## What is the advantage of providing bush in a bearing? And What is the material of bush?

The bush material would be of a softer material than the shaft/spindle that runs inside it, often bronze, even oil impregnated bronze. The reasons for using the bush are that the bush will wear out before the bearing or the shaft/spindle, therefore reducing the time and costs of replacing the bearing or shaft. It would usually be sensible to carry spare bronze bearings already made to size to allow for a fast replacement. Usually these bronze bearings would be turned up from a length of bronze bearing material, ask your bearing supplies company for it, and make a few up in one go on the lathe, then label them and put them somewhere you will find them again!
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## What is the difference between casting & forging? Why use castings & why use forgings?

The Difference Between Casting & Forging Casting is the process where metal is heated until molten. While in the molten or liquid state it is poured into a mold or vessel to create a desired shape. Forging is the application of thermal and mechanical energy to steel billets or ingots to cause the material to change shape while in a solid state.
15. 3 likes

## State difference between AnitiFriction Bearing and Journal Bearing?

State difference between AnitiFriction Bearing and Journal Bearing? 1. You can answer this question 2. You can like the best answer 3. You can share the question...
16. 3 likes

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

CC means Cubic Centimeter, It basically denotes the Volume of Cylinder, whether it may be a car or Bike.Technically it's the Bore Diameter and the stroke length of the cylinder.If a car as 1.8L Engine it's nothing but 1800 cc..Hence More the cc, more the power nd torque.
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## Kinematics of mechanics

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An introduction of mechanisms and machines
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## Vernier Calliper.png

From the album Engineering Images 7

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## State difference between AnitiFriction Bearing and Journal Bearing?

My understanding is that an anti friction bearing is a roller bearing, it has a point or line contact and a journal bearing supports supports a shaft and has surface contact. I also think speed has something to do with it, roller bearings are lower speed while journal bearing are high speed
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## Spring nomenclature.jpg

From the album Engineering Images

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## Explain why washers are used?

Washer can increase shear area where the bolt holds, and it eliminate friction and scrathing of both contacting surfaces of bolt head/nut and the surface being bolted
22. 2 likes

## pump cfd.jpg

CFD analysis on centrifugal pump
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## What is the advantage of providing bush in a bearing? And What is the material of bush?

S.K.Das Gupta-I think the question itself needs to be modified as "What is the advantage of providing a bush in a bearing housing in place of bush in a bearing. In fact ,the selection of bush bearing or anti friction bearing in a machine depends on the requirement.For example.in a crank shaft of an engine,the big end bearing can be fitted in two halves only.Hence a bush bearing in two halves is used.There is also a space consideration for the machine as anti friction bearing normally needs more space.Also,for very high speed machines,foil bearings are being used as these are very efficient and having a very long life.These days many bush bearings are being replaced with anti friction bearings to get better life and ease of maintenance.So in a nut cell,using a bush bearing/anti friction bearing depends on the function of the machines,it's operating condition,lubricant requirement,space for bearing mounting and many other factors. Material of bush may be phosphor bronze,gunmetal,cast iron,thermit or white metal,teflon etc.
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## Why gas containers are mostly cylindrical in shape?

To reduce the stress concentration at the sharp edges of the others shape like rec. sqr. trin. or any other shape. the Best shape is to use spherical shape but it seems not possible . In refineries the big spherical containers are used for storage , but for distribution purpose the cylindrical shape is the most suitable shape. Regards, Aftab
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## What is the difference between Jigs & fixtures.? When to design Jig and when to design fixture?

A jig's primary purpose is to provide repeatability,accuracy and interchangeability in the manufacturing of products. A device that does both functions (holding the work and guiding a tool) is called a jig. An example of a jig is when a key is duplicated, the original is used as a jig so the new key can have the same path as the old one. Fixture is a work holding device that holds, supports and locates the workpiece for a specific operation but does not guide the cutting tool. It provides only a reference surface or a device
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## What do you understand by performance test of IC Engine? How it is done ? We welcome your inputs in open discussion

Depending on the apparatus Torque & RPM may be the measured items and used to determine power. Horsepower vs Torque 850 HP vs 18HP w/ maximum tork @ 0RPM
28. 2 likes

## spark-plug.jpg

From the album Spark Plug

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## Explain why washers are used?

We use flat washer to reduce stress exerted by the nut, why we use spring washer where there is vibration to avoid work loose of the nut during operation
31. 1 like

## A Simple Statics Problem

Recently I was looking at the well known textbook, Mechanical Vibrations by S.S. Rao. I found an interesting problem there that seemed to be worth investigating further. The attached note is the result of that investigation. I challenge all of you to work through the details! DrD TwoSprings.pdf
32. 1 like

## in order to perform VBscripting how much should a person be aware of the knowledgew

in order to perform VBscripting how much should a person be aware of the knowledgeware work benches. should he know the general functions of knowledgeware or should he be well versed in it?
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## Why first angle and third angle projection method is used in machine design and why second and fourth angle method is not used?

I recall in my early years wondering about 1st and third angle projection. What happen to number two? To practice 3D CAD programs I use a 1947 drafting text book, first published in 1911. I found the best explanation of angle projections I have even come across. "First angle was the norm until 60 years ago. Now 3rd angle is the norm in the US and Canada." I am not sure if the 60 refers to the original 1911 printing or the 7th Ed (1947) that I have. Either way it was been around before all of us even the good DrD. I took a photo of the page. The section continues onto the next page but only adds that expensive mistakes have been made confusing the two systems. Now we make those expensive mistake confusing metric and imperial units.
34. 1 like

## Walking machines

The video of the walking machine is very cool. Great job!
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## Which is the best lubricant-air, oil or water?

oil is best lubricant b/c of higher density
36. 1 like

## Why I beam is so effective and used for heavy loading?

I regret to point out that ianbates1 has led us on a wild goose chase with his mathematical presentation. 1. The universal gravitational law, describing the force of attraction between two masses, is not relevant to a discussion of the bending of an I-section. 2. The resulting expression for a, the acceleration, is irrelevant as the beam bending problem is usually applied to static structures. 3. The bending deflection expression, FL^3/(3EI) is relevant for a uniform cantilever tip deflection only, but has no general applicability. 4. The expression for the area MOI, bh^3/12, is for a rectangular section as shown, which has no significance for the I-sect ion. 5. The stress-strain relation through Young's modulus explains nothing about the I-section. Other than that, yeah, sure .... why not? DrD
37. 1 like

## degree of freedom.jpg

From the album Engineering images 8

38. 1 like

## Explain why washers are used?

there are a few types of washer but standard washers are generally used to distribute force and to help stop the fasteners working loose. Having said that if your fasteners are too long washers make ideal spacers. Washers also make fastened items look more appealing.
39. 1 like

## What is difference between fan and blowers?

blower is a type of fan and blower working like a centrifugal pump. blower have 1.1 to 1.2 pressure ratio on other hand fan have below to 1.1 pressure ratio blower used for high pressure air like in furnaces Fan Blower Definition A fan circulates air around an entire room, or space. A blower circulates the air only on the specific or pointed area. Pressure It is uses less pressure to produce large amounts of gas. It is uses high pressure to produce large amounts of gas. Pressure ratio The ratio of pressure is below 1.1. The ratio of pressure is from 1.1 to 1.2. Air area It provides air in the complete area. It provides air in a specific location or point. Types Axial flow fans. Centrifugal fans. Cross- flow fans. Centrifugal blowers. Positive-displacement blowers. Consists of It consists of a motor and blades, which run of electricity. It consists of a fan, outer cover, inlet, out-let.
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## Bolt vs Screw - Open end discussion for mechanical engineers

Bolt vs Screw - Open end discussion The difference in design , forces , uses , material - which to use when and more..... 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
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## What does F.O.F Stand for and what is the use of it in Piping Design?

Been designing piping systems since 1962, been involved in the valve industry since 1972 and this is the first time I encountered "FOF"