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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
Steam turbine heat rate formula?
The efficiency of a steam turbine is just the ratio of power out to power in, but if you want to be able to calculate it from the basic mechanical design, this is a specialised topic. In the link below is a general description of steam turbines, in the references and additional reading list there are some references that may help you.
Isometric drawings, 3-D representations, are drawn on an angle to the parallel to show how the finished product should look. All dimensions should be the same as if drawn flat (2 dimensional).
How you calculate rated power of lathe machine?
It will be often desirable to know the power which is being consumed in operating a lathe on certain work for which data is required. For most purposes this can be sufficiently approximated by calculating the power of the lathe from the width of the belt and its speed in feet per minute.
For such purposes it is usual among mechanical engineers to consider that a one-inch belt traveling a thousand feet per minute will transmit one horse-power. This will give us a key to the entire calculation.
What are the advantages and disadvantages of Composite Materials?
Scientist do hybrid to pick up good qualities. So there are 2 things better in something they try to mix and make a best item. For Eg. some flower have good looks but no smell and other have great smell but dull look so they mix and try to make a flower with great look and smell together. what else
What is the auxiliary oil pump for in a power plant?
cooling and lubrication,filters,centrifuges,oil heaters,intake and exhaust
Mag rims get there name from what metal they are made from. Magnesium! It's is a very interesting metal. It's very light weight, strong and cheap. At the right temperature it melts like any other metal however if you get it to hot it burns. Like friken crazy! Anyways mag rims are made by melting magnesium and injecting it into a mold. After cooling the rims are then tooled to finish their look and function.
What is the possibility for moving up the career ladder for pedaitician?
Likely not much until you learn to spell it. Until then,
it could be embarassing in conferences, etc.
Why the vacuum is maintained in Steam condenser?
It is important to maintain a vacuum in a condenser if you want it to work well.
Knurling is a machining process normally carried our on a centre lathe. The act of Knurling creates a raised criss cross pattern on a smooth round bar that could be used as a handle, or something that requires extra grip
What is the ratio of the energy a machine delivers to the energy supplied to it?
efficiency
The ratio of useful energy to total input energy is called efficiency. It refers to the percentage of the work input that is converted to work output.
What is the tensile strength of marble?
Tensile Strength, Ultimate 7.00 - 20.0 MPa 1020 - 2900 psi
This is the strength in a pure tension test. For bending use:
Modulus of Rupture 0.00410 - 0.0276 GPa 0.595 - 4.00 ksi
source: http://www.matweb.com/search/DataSheet.aspx?MatID=211&ckck=1
The original Spinning jenny could spin eight spindles of yarn at a time, but as technology improved the most advanced Spinning jenny could spin one hundred twenty spindles at a time!
What is Efficiency of shell and tube heat exchanger?
A shell and tube heat exchanger will have two fluids flowing through continuously. The fluid in the tube will typically be the important fluid, the fluid you are trying to heat or cool. The fluid in the shell will then be the fluid that is heating or cooling the the fluid in the tube.
Take a steam heat exchanger for example. Steam condenses in shell, while the the fluid in the tube picks up the heat from the steam. And in a perfectly efficient steam heat exchanger, all the heat lost from the steam would be recovered by the liquid in the tube.
But nothing is perfect. A little bit of the steam's heat makes the outer shell hot, and that in turn heats the room. Heat is lost from the steam into places other than the fluid in the tube. So efficiency measures how much of the heat lost by the shell fluid makes it into the tube fluid.
Efficiency (for heating) = Amount of Heat that went toward heating the fluid divided by the amount of heat that was lost by the heating fluid.
So an efficiency of 1 is perfect. For every 1 unit of heat absorbed by the tube fluid, we spent 1 unit of heat from the fluid in the shell fluid.
And if the efficiency is 0.9, or 90%, then for every 10 units of heat that the shell fluid lost, the tube fluid gained 9.
Sometimes efficiencies are as bad as 40%. In this case for every 10 units of heat lost by the heating fluid, 4 units are gained by the fluid.
A slightly different definition of efficiency applies to cooling:
Efficiency = Amount of heat lost by the tube fluid divided by the amount of heat gained by the shell fluid.
Same story, if the shell fluid gains 5 units of heat, and tube fluid loses 4, then the efficiency is 0.8 or 80%.
What is the difference between Open loop vs closed loop fuel system?
What is the difference between 'Open Loop' and 'Closed Loop'? A: When the engine is first started, and rpm is above 400 rpm, the system goes into 'Open Loop' operation. In 'Open Loop', the ECM will ignore the signal from the Oxygen (O2) sensor and calculate the air/fuel ratio based on inputs from the coolant and MAF sensors, but mostly from a pre-programmed table in the memcal. The system will stay in 'Open Loop' until the following conditions are met: 1. The O2 sensor has varying voltage output, showing that it is hot enough to operate properly. (This depends on temperature)
2. The coolant sensor is above a specified temperature about 40oC/104oF.
3. A specific amount of time has elapsed after starting the engine. The specific values for the above conditions vary with different engines and are stored in the mem-cal. When these conditions are met, the system goes into 'Closed Loop' operation. In 'Closed Loop', the ECM will calculate the air/fuel ratio (injector on-time) based on the various sensors but mainly the O2 sensor. This allows the air/fuel ratio to stay very close to 14.7:1.
How do you find the tensile strength of rocks?
the ASTM (american society for testing materials) website has some information on rocks and minerals
Why ceramics have low tensile strength?
Ceramics are generally hard and brittle because of the type of bonds that hold the atoms together in the material. Ceramics are made up of covalent, ionic, or both types of bonds.
Covalent bonds are directional, which means that they form bonds only in specific directions and in a sense are more ordered/selective. So when a force is applied, the bonds will try very hard to resist deformation. As a result of this, the material is usually tough (toughness being defined as the ability of a material to absorb energy without rupture), but brittle when that threshold is passed.
Although ionic bonds are nondirectional in nature (meaning they can form bonds in multiple directions) , we need to realize that we are dealing with charged particles that become unstable when they are placed under a force. You could almost think of it as bringing like charges closer together when a strong enough force is applied to the material, so that they repel each other.
Hope that helps some, I think someone might want to expand on directional/nondirectional nature of bonds...
(Another Solution)
Ceramics tend to be strong but brittle because of the ionic bonding present between the metal and non-metal components of the material. Ionic bonds are very strong and require a relatively large amount of energy to break. However, once enough energy is applied to break the bonds, they break completely, making the material brittle. Covalently bonded materials like polymers are far less brittle because the covalent bonds can stretch during plastic deformation.
Does mechanical engineering require math?
You need to take up to 4 years of calculus, as well as many science classes in physics and chemistry. Classes in algebra and trigonometry may be prerequisites for calculus.
The 36 stands for the yield strength in ksi
Fty = 36 ksi = 36,000 psi
What is positive axial displacement of steam turbine?
axial shift of a steam turbine is the shifting of turbine rotor in the forward and backward direction due to steam thrust on blades of rotor.
What was the name of the biggest rocket built?
The largest Rocket ever built is called the Saturn V rocket and was used to send man to the moon from 1969 to 1972. Built by German engineer Whener Von Braun, the rocket measures 110,6 meters tall. Incomparison to the space shuttle, the shuttle with its external tank and solid rocket boosters attached measure only 56 meters tall. However NASA does have plans to create a new rocket, the Ares V which may be a couple of meters taller then the Saturn V rocket. The rocket is still in the conceptual stage, but may be used as a heavy weight launch vehicle in the near future.
Which laboratory tools are used to measure the temperature of water in a beaker?
It's got to do with science
How the liquid flow meter is working?
The turbine flow meter translates the mechanical action of the turbine rotating in the liquid flow around an axis into a user-readable rate of flow. The turbine tends to have all the flow traveling around it. The turbine wheel is set in the path of a fluid stream. The flowing fluid impinges on the turbine blades, imparting a force to the blade surface and setting the rotor in motion. When a steady rotation speed has been reached, the speed is proportional to fluid velocity. Turbine flow meters are used for the measurement of natural gas and liquid flow
