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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
Why are most gas containers cylindrical in shape?
In brief The most efficient shape for withstanding high pressure is a sphere but that would be costly to manufacture. A cylinder with a domed top and a domed bottom (look underneath, the flat base is actually welded around the outside, the bottom of the gas container is actually domed) is a much cheaper shape to manufacture whilst still having good stength to resist the internal gas pressure.
Some other ideas
The idea that "cylindrical vessels have minimum surface area to volume ratio and thus reduces heat transfer" is incorrect. The surface area to volume ratio for a cylinder depends on the ratio of its length to its diameter and most cycinders are manufactured with a much greater length than is ideal for minimising surface area. In fact a cube would be a better shape than most gas cylinders if this was the primary design consideration. Also heat transfer is actually often a good thing for gas containers, liquids require heat to convert to gases. Try using a butane cylinder on a near freezing day......
The idea that "they are cylindrical because there are no weak points such as joins and corners that the gas molecules could force apart" is partially correct, a cylinder with hemisperical ends has no corners which would certainly act as stress concentrators and therefore be much weaker for the same material thickness but many low to mid pressure gas containers are welded from sheet material so there are joins.
What are round bottom flasks used for?
Round bottom flasks are commonly used in chemistry laboratories for heating liquids evenly during distillation, refluxing, and chemical reactions. The round bottom design allows for efficient mixing and evaporation, making them ideal for applications where a uniform heat distribution is essential.
Are there any types of metal alloys?
Several. Ferritic, Austenite and Martensitic which can be further broken down into different types.
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Austenite has the highest degree of corrosion resistance, ferritic has the best machinability while martensite is the most suitable for objects that need to be hardened.
Some examples of martensitic stainless steels are 440c, Ats 34, Cpm s30v.
What is FCC FCC means Face Centered Cubic Ductility is the mechanical property of a material.It is the material's ability to deform under the tensile stress without fracture.So it is depends on the atoms how they arranged in a lattice and its grain size. The ability to absorb the energy of the impact and fracture resistance depends on the arrangement of the atoms in a lattice and features of grain structure.
What are four physical properties used to compare metals non-metals and metalloids?
- Conductivity: Metals typically conduct electricity and heat well, while non-metals are poor conductors.
- Luster: Metals exhibit a metallic luster, appearing shiny and reflective, unlike non-metals which are generally dull.
- Malleability: Metals can be hammered into thin sheets (malleable), while non-metals are brittle and not malleable.
- Density: Metals are generally dense compared to non-metals, which are lighter in density.
Alloy of a metal increases its hardness. Gold becomes hard when copper is mixed in it. Alloy of a metal gives it a different colour. An alloy of copper and aluminium (known as aluminium bronze) has a beautiful golden yellow colour. It is used for interior decoration.
How is statically cast stainless steel different from centrifugally cast stainless steel?
Centrifugal casting solidify under high G forces against the mold Inner Diameter. This promotes ideal directional solidification.Achieving a very fine and compact grain structure.
The self cleansing action of the centrifugal casting process moves all slag and inclusions to the inner diameter. The remaining casting is free from all such impurities.
The process is also called liquid forging as liquid metal is directly forced into shape.
There is no such animal.
The only U.S. coins to be struck in steel were the famous 1943 "war cents". Steel was used because copper was needed to make ammunition. The coins were coated with zinc to prevent rust. Unfortunately the coins didn't work out in general circulation - when new, they looked like dimes and many people were confused; when they started to wear the zinc turned grayish-black, leading to the (false) rumor that the coins were made of lead; and finally when the zinc wore through, the underlying steel rusted.
Is a deodorant healthier using ammonium aluminum sulfate than aluminum chlorhydrate?
I'm not sure which of those is less healthy, but I know that Potassium Alum deodorant stones are the best and safest deodorants I've tried. They are also inexpensive and last a long time, with no sticky residue.
What is the coefficient expansion of transformer oil?
Transformers can be filled with various types of Refined Mineral Oil. That coefficient is something you would find in specifications of the supplier.
Commonly, it is .08% per degree Centigrade.
How many wind turbines are in Iowa?
As of 2020, Iowa has over 7,000 wind turbines installed across the state, making it one of the top states in the U.S. for wind energy production. Iowa's wind energy capacity continues to grow as it aims to further increase its reliance on renewable energy sources.
High cycle fatigue occurs when a material experiences repeated cyclic loading at a stress level below its ultimate strength, leading to failure over time. It is characterized by a large number of cycles of stress compared to low cycle fatigue, with failure typically occurring due to material micro-damage accumulation. High cycle fatigue is common in applications where a component is subjected to cyclic loading for a prolonged period.
What is the definition of flammability?
It means that it is able to catch on fire.
How flammable something is. More simply, how easy something will catch in fire.
Flammability (flammable) means something is able to catch on fire.
Is it possible to attain an efficiency of 100 percent in heat engines?
The maximum efficiency of the carnot engine only depends on two factors:
1 - The temperature of the hot reservoir (TH)
2 - The temperature of the cold reservoir (TC)
And is given by (TH - TC) / TH « or » 1 - TC / TH So by that we can see the maximum efficiency (100%) would be when the difference of temperatures between the two reservoirs is infinite.
Two turbines will require duplication of the equipment which supports the turbines - the steam piping or gas burners to drive the turbines, the condensate or exhaust systems to handle the turbine discharge, the lube oil systems, and the instrumentation to monitor and control the two turbines. These are all cons since the cost of duplicated equipment is roughly double.
Two small turbines provide improved reliability over one large turbine since when the turbine has to be shut down for maintenance or repair, one of them can continue to operate. This is a pro for two turbines.
What is a pipet pump and how is it used?
A pipette pump is a modern and more complicate pipette, having a little mechanical pump; the scope is to delivery small and precise volumes of liquids.
See the link below or catalogs of chemical laboratory accessories.
What is the work of a mechanical engineer in NASA?
Buckle up 'cause the NASA mechanical engineer has his hands full. Both of them! The mechanical engineer might be called an "applied physicist" because he takes the principles of physics and applies them to mechanical systems. Let's check it out. Rockets, space stations, satellites and stuff like that are all mechanical structures. Someone has to figure out what is wanted, what is needed, and what is possible. They'll also need to figure out what will have to be "bridged" and "created" or "invented" using the most current materials, methods and manufacturing processes to make it happen. They reach into the future to adapt innovative and newly appearing materials and ideas as well. These thinkers and problem solvers will be looking at everything from, say, the overall size, shape and mass of a modular Skylab addition to the individual fasteners, welding techniques or machining that will be used to build it and keep it together. Everything in between will also be looked over closely. One NASA engineer will be looking at a module, and another will be looking at how it couples to other modules. Still another will be thinking about what fixtures and machinery will be needed to handle the piece on the ground, and also up in space to throw it out of the ascent vehicle and position it for attachment. Senior engineers who have "been there and done that" will oversee sections of the projects, and those in work groups will report to them. Anyone in space is riding in a mechanically engineered vehicle or on a mechanically engineered platform. He's breathing air from a mechanically engineered air system, and drinking and eating stuff held in mechanically engineered reservoirs or compartments. He cleans himself and gets rid of waste in mechanically engineered facilities. Think about what you do in a day and imagine doing it in a box about the size of a walk-in closet. That closet up there displays the best the mechanical engineers can come up with. NASA engineers use all their education to pull off the things they do. They're all math minors (or physics minors, or both - or even double majors!) 'cause they flew through the Calculus and applied it to stress and strain problems, thermodynamics, fluid mechanics and a whole bunch of other stuff Newton could only dream about. There are lots of things "hidden" in mechanical engineering. Robotics. Nanotechnology. Composites (with chemists). Oh, and how do you suppose we figure out about how craft will behave in space? Orbital mechanics is really mechanical engineering. If you're considering mechanical engineering, math and physics pave the way. Know that up front. These are the heart and soul or "backbone" of this branch of engineering. It's a science. And only thinkers need apply. Problem solvers. Outside-the-box operators. But it's something you can do if you want it. Betcha. Start now. Come to think of it, by asking the question, you've already started. Step on up. See it happening. Go for it. Never let up. One class at a time, one semester at a time. The door is open. Step through. Got links if you want 'em. Look below.
When you heat glass enough to almost melt it, it becomes a gooey, gluey substance,
like very stiff slime. In that condition, it's rolled flat to make window-glass, or spun
on the end of a rod to make cups and bottles, or blown up like a balloon to make
bottles with very thin necks.
Also when glass is in that condition, if you grab a little pinch of it (with tongs!)
and slowly pull it away from the main glob, it stretches way out and becomes
very thin before it finally breaks. It can be stretched to where it almost has the
consistency of cotton candy or fine hair, and that's the material used in
fiberglass home insulation. When it's stretched not quite as thin as that, to the
thickness of a thick sewing thread or a nylon fishing line, it's quite flexible, and
in this condition, a plastic jacket is formed over it, just like a piece of wire, then
several of them are jacketed into a single cable and used for "fiberoptic" data
communication ... a pulsed bright infrared light, injected into one end with a
laser diode, travels very nicely through several miles of this glass thread to be
received at the other end of the cable.
So "fiberglass" is glass that's been melted and stretched until it's no thicker
than all those other things we've been calling "fiber" for hundreds of years.
Can you increase or decrease the surface shine of polypropylene prior to injection molding?
Yes, you can modify the surface shine of polypropylene by adjusting the mold finish, such as using a higher polish for a shinier surface or a matte finish for a duller surface. Additionally, using additives or processing techniques during injection molding can also influence the final surface appearance of the polypropylene product.
What is a steam turbine diaphragm?
Steam turbine is comprising of stages, number and size of the stages depands upon the break horse power of the turbine.
The stage has set of moving and fixed blades. The moving blades are attached to the rotor while the stationary blades is called Diaphragm.
The diaphragm guides the steam to glide over the moving blades for producing rotary motion.
What metal or alloy can be used to stop magnetic field?
The simple answer is none. However magnetic fields will take the path of least resistance; soft iron does not retain magnetism and offers a path of lower resistance than air so it will tend to divert a field from travelling through whatever it surrounds. If the field is strong then the magnetic shield will have to be more massive.
Mu metal is a name of a low retentivity iron product. Other ferrous and nickel alloys will offer some protection.
If the source of the magnetism is a point then the field strength will diminish by approx. the square of the distance from the source, so double the distance and the force is reduced to a quarter.
An in situ reaction refers to a chemical reaction that takes place in the same location where the reactants are initially present, without removing them from that environment. This technique is commonly used in various applications such as environmental remediation, material synthesis, and biological studies to observe reactions in their natural settings.
A triangular file is a type of hand tool with a triangular cross-section used for filing and shaping metal or other materials. It has three sides with cutting teeth that gradually taper to a point, making it ideal for reaching into tight spaces and creating precise angles and shapes.
What is the Average water flow rate for drilled well?
This really depends on where you are and a lot of other factors. A minimum acceptable flow rate for a family of 4 would be about 3 gallons per minute into the well. A "good" (good flow rate, we aren't taking about the quality of the water here, just the volume) well would produce 5 or more gallons per minute. According to my local well driller here in Western PA, a "gusher" is 20 gallons per minute coming into the well.
