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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
How do you calculate least count of spectrometer?
The value of each main scale divisions is half a degree(30') .
The number of vernier scale divisions is 30.
29 main scale divisions are divided into 30 vernier scale divisions (30 VSD = 29 MSD )
Therefore value of 1 VSD = 29/30 MSD.
Least Count (L.C.) = 1MSD - 1VSD
= 1MSD - 29/30 MSD
= 1/30 MSD
= 1/30 x 30'
(L.C.) = 1' (1 minute)
From experience I know that brazing BMS is much better than other types of welding because it causes lessdistortion. Meaning if you're following a tolerance e.g. by 0.5mm you can be sure you will still be within your tolerance after brazing.
Hope that helped, I do Technology at A-Level so I know a thing or two. :)
What is the disadvantage of without preheating in welding?
Preheating can assist the welding penetration on materials with high thermal conductivity such as thick aluminum sections or even some steels. This reduces the heat sink affect (rapid cooling) of the deposited weld by the surrounding cold metal. Preheating also significantly reduces the rapid cooldown of the item post welding. Contrary to many beliefs, it is difficult if not impossible to overheat metals but many metals (such as carbon steels) can become brittle if cooled rapidly. They can also lock in post weld stresses that can compromise the engineering qualities expected. Preheating builds up heat in the metal and it takes longer for it to cool. In affect, preheating is also a portion of the postheating formula. In most welding code applications, carbon steels and some other metals require preheating prior to welding to be in compliance.
A ball rolling at a constant speed at the same rate of speed on a still surface.
brass, steel and bronze are the most common alloys. they are made of:
brass: 35% zinc and 65% copper - uses, musical instruments
steel: 99% iron and 1% carbon - uses, tools, car bodies etc
bronze: 87.5% copper and 12.5% tin - uses, boat hardware and screws etc
some not so common alloys are alnico (aluminium and nickel and cobalt - used to make magnets) and stainless steel (18% chromium, 80.6% iron, 1% nickel and 0.4% carbon - used to make surgical tools and tableware and cookware.)
What is rotary vane compressor?
use rotating members to compress and increase the pressure of the air.
Which steel is expensive hot rolled or cold rolled?
It takes much more energy to roll a sheet of metal in cold rolling than it does for hot rolling. Heating up a sheet of metal makes the material more malleable, so when it is rolled between two rollers, it can form into a flat sheet much easier. A cold sheet of metal that is not heated up will be put through the rollers and have a higher amount of energy needed to push it through. Though there is less heating required, this is balanced out by the fact that it must be pushed through with more energy.The cold rolling process is an expensive one, especially compared to the process of hot rolling sheet metal. For example, since cold rolling requires that workers frequently clean parts like the rollers, cold rolling has extra costs for any supplies needed to clean the parts, downtime while the parts are being cleaned and labor costs for the worker who does the cleaning. Also, the additional energy needed in the cold rolling process adds cost to the final product.
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How does compression force work?
Use virtualdub and download Divx codec
drop your movie into virtual dub, File -> Append avi segments... if its more than 1 file.
Then in virtualdub go to Video -> Compression... and select divx codec (u can go to settings to change quality)
finish settings on divx codec and then File Save as AVI...
done
What did mechanical engineers contribute to society and why?
An engineer is a professional practitioner of engineering, concerned with applyingscientific knowledge, mathematics and ingenuity to develop solutions for technical problems. Engineers design materials, structures and systems while considering the limitations imposed by practicality, safety and cost.
The seven-mile bridge that spans across the Gulf of Mexico to connect two cities of the Florida Keys ~APEX
Alloys are made from a mixture of metals that are usually melted together. In this way brass, pewter, bronze are made. An amalgam which is also an alloy, is easier to make because mercury is a liquid at room temperature and metals dissolve in it.
How does multi-stage steam jet air ejector works?
A steam ejector is a pump-like device, with no moving parts or pistons, that utilizes high-pressure steam to compress vapours or gases. This creates a vacuum in any vessel or chamber connected to the suction inlet of the ejector
The adjacent diagram depicts a typical modern ejector. It consists of a motive fluid inlet nozzle and a converging-diverging outlet nozzle. In this case of a steam ejector, the motive fluid is high-pressure steam. The Venturi effect, a particular case of Bernoulli's principle, applies to the operation of this device. The high-pressure steam is converted into a high-velocity jet at the throat of the convergent-divergent nozzle which creates a low pressure at that point. The low pressure draws the suction fluid (a vapour or gas in this case) into the convergent-divergent nozzle where it mixes with the high-pressure steam. In essence, the pressure energy of the inlet steam is converted to kinetic energy in the form of velocity head at the throat of the convergent-divergent nozzle. As the mixed fluid then expands in the divergent diffuser, the kinetic energy is converted back to pressure energy at the diffuser outlet in accordance with Bernoulli's principle. The compression ratio of the steam jet ejector, P2/P1, is defined as ratio of the ejector's outlet pressure, P2, to the inlet pressure of the suction vapour or gas, P1. The entrainment ratio of the steam jet ejector, Ws/Wv, is defined as the amount of motive steam, Ws (in kg/hr), required to entrain and compress a given amount, Wv (in kg/hr), of suction vapour or gas. The compression ratio and the entrainment ratio are key parameters in designing a steam jet ejector. In practice, for suction pressure below 100 mbar absolute, more than one ejector will be used, usually with condensors between the ejector stages. Condensing of motive steam greatly improves ejector set efficiency. Both barometric and shell-and-tube surface condensers are used for this purpose. BY M.D.V.PRASAD
mdvprasad007@gmail.com
How might the law of conservation of matter apply to daily life?
Law of conservation of mass shows that matter is conserved no matter what it undergoes. Some examples are ice cubes that melt to give same mass of liquid, oxidation of copper and closed metamorphic systems.
A diagram based on the different percentages of carbon and iron. It shows the different grain structure in the materials created and different melting and "mushy" stages of the material at certain temperatures. Here is one: http://www.sv.vt.edu/classes/MSE2094_NoteBook/96ClassProj/examples/kimcon.html The metastable iron-carbon phase diagram, however, is used when studying the microstructures of steels (both carbon steels and alloy steels), as well as various heat treatments. Here is a detailed description of the metastable iron-carbon phase diagram: http://www.calphad.com/iron-carbon.html
wi 7500 joules
fi 250 newtons
di 30 meters
A+
What makes a car aerodynamics?
Aerodynamics is related to the shape of the car to reduce air resistance and drag. Aeroplanes are kept clean and polished for the same reason - to reduce the friction caused by the air resistance.
The drawings and work instruction and the safety handouts are obtained from my instructor. Technical manuals and kept in the tools store. The reference tables/chart is in the workshop or in the library.
Alternative answer similar to above.
Documents are obtained from either the Drawing Room (Plans and Technical Drawings) or the Database (PC). Authorisation to use/view the files is needed to help with central file control and regulation.
Choosing an Engineering Technology Career ?
There are several different paths that you can take if you are considering a career in Engineering Technology. You can become a civil engineer and help build roadways or a mechanical engineer and help develop machinery for manufacturing companies. You can even choose a career as an aerospace engineer and help develop airplanes and spacecraft.
