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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 first pressure reducing valve?
A detour will be open for causing the hydraulic oil pressure is low.
What is the minimum slope permitted for 4 inch underground sewer pipe?
A slope of 1/4" in 12' is 0.0017 - inadequate for cleansing; it should be at least 0.0084 to produce a reasonable flow velocity of 2 ft/sec.
The metric slope I was informed is 18mm in 1000mm
Most codes require a 1/4" slope for each 12" of run.
What are types of EN series of material?
EN series is the outcome of British Standard(BS970) steels developed during world war time. Slowly this series is replaced by DINEN series now. Almost all stells are conered in EN series.
What are the working conditions for a petroleum engineer?
Deep-water, arctic and desert conditions are commonly contended with. High Temperature and High Pressure (HTHP) environments have become increasingly commonplace in operations and require the petroleum engineer to be savy in topics as wide ranging as thermo-hydraulics, geomechanics, and intelligent systems.
What is preheating in welding?
welding cast iron is not reccomended although it can be done,myself i have always had the best luck by preheating the cast iron to almost cherry red then using a low hydrogen electrode such as 7018 which is fairly common,there is also an electrode known as inconel which contains the alloy nickel,but its hard to find and very expensive
Is tensile modulus the same as young's modulus?
Yes, indeed.
Sometimes tensile modulus is different from flexural modulus, especially for composites.
But tensile modulus and elastic modulus and Young's modulus are equivalent terms.
we find mechanical advantage of pulley by using principle of lever. according to this moment of effort is equal to moment of moment of load. As in this case effort arm is equal to load arm. so mechanical advantage is equal to one. but we know we can never finish friction between rope used and pulley so mechanical advantage is less than one
What are the advantages of a reciprocating air compressor?
Any Air Compressor has to be maintained from time to time. If schedule maintenance are done then the wear and tear are very minimal. They are user friendly and they are efficient due to staging besides they also produce more Air pressure which are required for many other applications. Reciprocating compressor also very useful and reliable for compressing and pumping liquids. It also most prominently used in oil refineries, chemical plants, pipelines and natural gas processing plants.
Why are number of compressor stages more than turbine stages in a jet-engine?
Flow does not like the pressure gradient it sees going into the compressor and is therefore, more likely to separate (causing flow separation). Therefore, a more subtle increase in pressure through each stage is needed in the compressor.
The turbine does not see this problem.
momentum is caused by inertia. all objects have inertia, which means if they are moving at a certain velocity or are at rest they will continue to move at that velocity or remain at rest unless acted on by a force. Objects of more mass have greater inertia, so the amount of momentum is equal to the product of an objects mass and the magnitude of its velocity.
How has your education prepared you for your career as mechanical engineer?
If you go to a good school, as I did, you are exposed to a much wider range of things in school than you are at any one job in practice. This is a very good thing- it gives you the flexibility to take your company in new directions, or to move to another company if that works better for you. It is amazing how often a basic idea you remember from one field can be a novel improvement in another field. The difficulty of an engineering education is itself good preparation for an engineering career. Sometimes, the discipline matters more than the actual specific knowledge. In college, you are asked to solve tough problems and you get them done. Remembering that you did makes the things you run into in practice easier to handle.
Examples of pulleys in your house?
blindsshoe laceswellflagpoleWashing machine has pulleys that turn it.
What information is given by the angular momentum quantum number?
Each atomic orbital is designated by the principal quantum number followed by the letter of the sublevel.
-for more information see..."Modern Chemistry" text book Pg.108 3rd and 4th paragraph.
Will reducing carbon in steel increase malleability?
Yes. Carbon is added to iron in steel to make the steel stronger by making it more rigid. The more rigid a metal is, the less malleable it is.
What is the Difference between rising stem gate valve and non rising stem gate valve?
Rising stem gate Valve- Stem threads are out side of valve body and in no contact with fluid medium. Stem rises while opening the valve (by hand wheel). Since the stem threads are located outside obviously it needs some more vertical clearance space while opening the valve.
Non Rising Stem gate Valve - Stem threads are inside the the valve body and it is in contact with fluid medium. Hence, lot of chances for fouling the threads and these types of valves only can be used in clean liquids and gases. Less vertical clearance space required while opening the valve.
What is high grade-tensile steel?
Classification of high grade-tensile steel for Automotive: Automotive steels can be classified in several different ways. One is a metallurgical designation. Common designations include low-strength steels (interstitial-free and mild steels); conventional high-tensile or high-strength steels, otherwise called HSS (carbonmanganese, bake hardenable, high-strength interstitial-free, and high-strength, low-alloy steels); and the newer types of ultra-high tensile or Advanced High-Strength Steels, called AHSS (dual phase, transformation-induced plasticity, complex phase, and martensitic steels). Additional higher strength steels for the automotive market include ferritic-bainitic, twinning-induced plasticity, hot-formed, and post-forming heat-treated steels.
A second classification method important to part designers is strength of the steel. In this answer, the general terms HSS and AHSS is used to designate all higher strength steels. In contrast, much of the current literature in the world today uses narrowly defined ranges to categorize different steel strength levels. One such system defines High-Strength Steels (HSS) as yield strengths from 210 to 550 MPa and tensile strengths from 270--700 MPa, while Ultra-High-Strength Steels (UHSS) steels have yield strengths greater than 550 MPa and tensile strengths greater than 700 MPa. These arbitrary ranges suggest discontinuous changes in formability when moving from one category to another. However, data show property changes are a continuum across the entire span of steel strengths. In addition, many steel types have a wide range of grades covering two or more strength ranges.
A third classification method presents various mechanical properties or forming parameters of different steels, such as total elongation, work hardening exponent n, or hole expansion ratio .
The principal difference between conventional HSS and AHSS is their microstructure. Conventional HSS are single phase ferritic steels. AHSS are primarily multi-phase steels, which contain ferrite, martensite, bainite, and/or retained austenite in quantities sufficient to produce unique mechanical properties. Some types of AHSS have a higher strain hardening capacity resulting in a strength-ductility balance superior to conventional steels. Other types have ultra-high yield and tensile strengths and show a bake hardening behaviour.
How can you keep the arc from spattering as you weld?
for mig welding spatter can be reduced by amp, voltage and wire speed adjustment. check shielding gas. stick welding check the recommended voltage, amps and application for the rod you are using keep your arc short. tig welding, be sure you are using the proper tungsten, and shielding gas and filler rod for the metal you are welding, don't dip the tungsten. make sure the metal you are welding is clean .
What is safety device of diesel generator?
Actually safety devices of generator depends on the type of prime mover used in generator. The main safety devices in a DG Set is to control the over speed, to limit the fuel supply in case of emergency. It is regulated by the governor of the DG Sets. In external safety, over voltage & over current tripping relay i.e. associated with DG Sets control panel.
How does centrifugal chiller work?
Vertical turbine pumps are centrifugal pumps mounted vertically. They operate on the same principals as all centrifugal pumps operate, with a rotating impeller around a central shaft. Vertical turbines can be found in single or multi-stage applications requiring high volume, high lift, as well as high discharge pressure.
What is the function of a lead screw in a lathe machine?
The lead screw moves the turret by a precise increment for every rotation of the screw. This allows the machine to generate threads in a workpiece, to generate precise length and diameter dimensions, and to maintain a constant rate of metal removal.
What are the cooling methods used for cooling an alternator?
Air cooling ,hydrogen gas cooling ,water cooling
What is the unit of angular momentum?
joule seconds or newton meter seconds depending on what system you use
