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Mechanical Engineering
Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.
10,989 Questions
What is the Coefficient of volume expansion of wax?
You will find your answer in a paper and experiment done at the University of Applied Sciences Jena in Germany. They (M. Schimmelpfening, K. Weber, F Kalb & K.-H. Feller) determined the expansion coefficients of 9 samples of parafin wax with regards to Congealing Point, Needle Penetration and if a crystal transformation had occurred. They included a fully refined macrocrystalline, an intermediate and a plastic microcrystalline. The coefficients range from the micro wax with the higher CP and Pen at .73 X10 (-3) to the 2 phase waxes at .89 x 10(-3) and intermediate at .75. Check out their paper on how they determined these, it's good. Google "Volume expansion of parafins from dip tube measurements"
What mechanism converts rotary motion to rotary motion at right angles?
A rack and pinion, cam, crank, and screw can do that.
What is difference between ERW and CRW Pipes?
ERW: Electric Resistance Welding tube
- tubes are rolled and joined With welding - fin cut is there
CRW: Cold Drawn tube
- without fin cut - Draw process
Where would high carbon steel be on a car?
Most auto bodies are made of sheet metal (steel) and aluminum in varying mixes. More and more parts are being made of carbon fiber (for it's low weight) although the expense of carbon fiber has, to date, kept the production to a minimum. Some vehicles such as the Corvette are made of fiberglass.
I think they are used for crash saftey.
In modern cars and other vehicles, the frame is a highly engineered crash-absorption component that can help to protect you and your family in a collision by dispersing impact forces more predictably. Every year, hundreds of thousands of used vehicles with hidden frame damage to that very component are bought and sold, usually for one of two reasons:
1. Typical visual frame inspection procedures for new or pre owned vehicles used by even the most reputable car dealers can actually fail to detect hidden auto frame damage from a common collision.
2. Unscrupulous individuals are "passing off" a salvaged car that has been totalled and refurbished, but not repaired correctly or to vehicle safety specifications.
How Frames React In Collisions
Safety engineering has made incredible leaps in the past few decades of automotive design. Frame structure and manufacturing has played a significant role in many of these automotive advances.
Just as the highly technical design of an Indy race car keeps its driver alive in an otherwise horrendous crash, the design and integrity of a frame dictates how a passenger car or truck "behaves" in a collision. Crumple zones are precisely engineered to absorb impact and protect you and your family. Air bag deployment is also affected by frame design.
For every vehicle, the manufacturer has developed the ideal behavior characteristics of the frame seen in automobile crash tests. Auto frame damage can compromise your vehicle safety even in a minor rear-end collision by changing your car's alignment, crumple zones or air bag deployment.
Impact Damage When your car is in a collision, its frame can become damaged in two ways. First, the accident can result in direct damage to the frame, which appears at the location of impact. For instance, as you might expect in a rear-end collision, the rearmost sections of your vehicle frame may be damaged.
Aerodynamics is the study of the way in wich objects move through the air. If something such as a car has an aerodynamic shape or design, it goes faster and uses less fuel than other cars because the air passes over it more easily. The form of a aerodynamic is used as a modifier.
Why hardenability of plain carbon steel is less?
hardness is defined as a resistance to plastic deformation or penatration.Hardness is defined as the ease with which hardness may be attained by quenching . It is also defined as the ability to develop maximum hardness by quenching.It is the process to have a hardened layer of marten site after quenching and also to have high hardness at same given depth.
The material which having low critical cooling rate have high hardenability.The factors which reduce critical cooling rate increase the hardenability.alloy steels have low critical temperature.
In plain carbon steels are contain not more than .5% of silicon and 1.5% of manganese.These steels are strong,tough,ductile and used in expensive materials.Increase in hardness and strength in plain carbon steel is depend upon the presence of carbon content.
Specification of hydraulic Jack?
travel jack hydraulic type with 50 metric tonnes capacity - specification
Why mild steel is preferred over cast iron?
Pros : Readily available, Easy to shape, Weldable, Many shapes available
Cons : Not that strong for its weight, rusts easily, cannot be made better by heat treatment
Difference between carbon steel and stainless steel knives?
It depends on the type of stainless steel you are referring to. Austenite and ferritic stainless is not heat treatable in which case carbon steel could be made far harder. However..martensitic stainless steels are heat treatable in which case they could be made harder depending on the alloy contents. Generally the more carbon a steel contains, the harder it can be made. Chromium; a key ingrediant in stainless steels, can also increase hardenability.
How do you find the gradient of a straight line?
You look at the change in the vertical distance and divide that by the change in the horizontal distance. This is known as the rise over the run. So if the line goes 4 units and over 2 units, the slope or gradient is 4/2=2. Horizontal lines have slope 0 since the rise is 0
It is my2-y1/x2-x1 the points are (9,7) (6,5) x1 y1 x2 y2 m5-7/6-9 m= -3/-3 m-0 That is the gradient
How many cc does it take to make one horse power?
that doesnt make any sense retard
He is not all that retarded;
I have an 8 horsepower Honda engine
Clearly written it says 242 CC
My calculations would indicate there are:30.25 cc to make one horse power
At least with a Honda engine.
Of course the compression ratio would change that figure.
Also the octane of the gas would also have a bearing.
Generally after I have calculated a few engines.
My answer would be approximately, 30 cc to one horsepower.
By the way,, "doesn't" is spelled with an apostrophe.
IslandNick
How a can capacitor smoothen or reduce the ripple of the voltage produce by the rectifier?
Rectifiers will not give a smooth DC voltage. There are ripples in the voltage given the rectifier. So in order to smoothen the voltage we use capacitor in parallel to the rectifier output.
Now lets see how the capacitor smoothen the voltage that is coming from a rectifier......
Capacitor blocks DC and allows AC......
If we take the voltage that is coming from the rectifier it has some ripples
in addition to DC, these ripples can be divided in to sinusoidal wave forms
( fictitious )according to the Fourier series. So the rippled DC now divided
( fictitious ) in to a pure DC and sinusoidal AC wave forms having the frequency that is multiples of ripple frequency.
Now the DC current will not pass through the capacitor as the capacitor blocks DC. But the AC will pass through it i.e the ripple wave forms that are divided ( fictitious ) in to sinusoidal AC wave forms will pass through the capacitor. So only DC current enters in to the load, which will produce a pure DC voltage drop across the load.
In this manner the capacitor smoothens the voltage.
What makes the concord travel at the speed of sound?
Using the usual Jet A1 its a combination of factors including that piercing nose, the raked wings to reduce drag, the pencil thin body for least resistance but most of all those afterburners. Look up the Olympus 593 Mrk610 turbojet engines and say hello to power!
What are compound pulleys used for?
Compound pulleys are used in a similar manner to a gearbox. You can select the ratio to suit the load and the power source. With the correct pulley combination one man can lift 10 tons from a truck onto a ship without motorised assistance.
What NPSH stands for and its meaning?
Net Positive Suction Head. It is the difference between hydraulic pressure and vapor pressure, usually of concern at the inlet of a pump. Without sufficienty high NPSH at a pump inlet, there will be cavitation in the pump. Within a centrifugal pump there can be pressures lower than at the inlet as the fluid is moved by the impeller. If any of those pressures is lower than the vapor pressure, vapor pockets- bubbles- form and you get cavitation. A more complete explanation: http://en.wikipedia.org/wiki/NPSH
What are facts about engineering?
"Nothing is true, everything can be questioned" but while learning the basics one should not question :(
It takes an engineer to undertake the training of an engineer and not, as often happens, a theoretical engineer who is clever on a blackboard with mathematical formulae but useless as far as production is concerned ;)
How do you find the weight of 1 sqm of 10mm ms plate?
In order to find the weight of the sheet of steel we must first calculate it's mass.
In order to do this we require the volume of the steel sheet (which we can calculate) and the density of mild steel.
The steel sheet in question has a volume of 1 x 1 x 0.01 m3. Mild steel has a density of 7800 kg/m3.[A]
As such the mass = 7800 x 0.01
mass = 78 kg
In order to calculate the weight (which is a force due to gravitational acceleration acting on an object) we must multiply the mass by g - the gravitational acceleration.
Weight = 78 x 9.81
Weight = 765.18 Newtons.
[A] Cobb, F. (2009) Structural Engineer's Pocket Book, 2nd Edition. Amsterdam, Elsevier.
What are subjects of mechanical engineering for second year?
If you are training in the UK, visit the City and Guilds' website -there you will find everything you need to know about the curriculum for electrical training.
What materials are used in vacuum forming?
- ABS
- PC/ABS
- HDPE
- TPO
- HIPS
- PVC/Acrylic.
What is planning in machining process?
Planning is similar in all applications. That's when you decide how and what to do and in which order.
I assume you mean PLANING. That's the process of making a surface flat.
In a tensile test, a specimen of material is pulled apart slowly until it breaks. Measurement is continuously taken of the increase in length and the force applied. The increase in length is normalized by dividing it by the original length, and the force is converted to stress by dividing it by the original cross-section area of the specimen. The results are plotted on a graph, called a stress-strain curve, with the stress on the Y axis and the strain on the X axis. The initial part of the curve is usually linear. That linear section is called the elastic region. The slope of the line in that area, which is stress divided by strain in the elastic region, is the elastic modulus.
