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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 much do you make an hour when welding?
There are far too many variables to provide an answer to this question. But we do know that for linear welds, like the joining of steel plates in something like, say, shipbuilding, a robotic welder can outweld any human welder. And the longer the time a study is conducted the farther the machine outpaces the man. But in welding, say, small piping with many elbows and tees, the human can outpace any robot. Welding rates vary with the geometry of the material being welded, and according to who or what is doing the welding, and under what conditions.
Which is more in heat transfer between parallel and counter flow heat exchanger?
Counterflow heat exchangers typically transfer more heat to a fluid simply because the hottest part of the exchanger is where the heating medium enters the heater and the heated medium leaves the heater. In a parrallel flow exchanger the hottest part of the heater is where the heating medium enters, and the coolest part where the heated medium enters, and some temperature in between is found where both exit the heater.
What are the sources of errors in youngs modulus experiment?
One inaccuracy can be that the wire or material that you are using to find Young's Modulus has some impurities and there may be a slight variation in the cross sectional area so a shorter piece of that material should be used.
What does relation carbon equivalent with tensile strength?
Higher the carbon the steel will have higher TS up to certain point.
Pressure is an effect which occurs when a force is applied on a surface.
Mathematically pressure is: p = F / Awhere: * p is the pressure,
F is the normal force,
A is the area.
What is the velocity of superheated of steam?
you don't have enough information to answer that question.
Superheated steam only tells us that the water has been completely changed to steam and is at some temperature beyond that point (at atmospheric pressure, above 100 C).
What you've said doesn't give any information on pressure, pipe size, pumps, or anything else. Superheated steam could be moving at the speed of sound or going nowhere depending on conditions.
What is the difference of efw and erw?
EFW: Electric Fusion Welding is a more general term which includes Electric resistance welding (ERW) and other types of welding such as Arc welding.
How do hydroelectric power stations produce electricity?
- Water held high up in the hills behind a dam.
- Pipework drains the lake to a lower level.
- The force of the water in the pipe is used to spin a turbine.
- The turbine is connected to an alternator and produces electricity.
- When it rains the lake is topped up with water.
- During low demand periods, water can be pumped back up to the lake as well, using electricty from other sources.
No. A nut and bolt are a matched set of fasteners. The bolt goes into or through the object it will secure, the nut is spun on to the bolt and snugged up tight to complete the fastening. A screw is a single fastener driven into (usually) wood - there is no nut used with it. There are also screws for use in metal, but they do not hold as securely as a nut and bolt.
What is difference between welding and weld-ability?
I was taught that soldering,as it relates to piping, is the heating of the base metal to a point to where the filler metal will melt and fill the gap between the two pieces of metal being soldered. The base metal is NOT melted, only the filler metal. Soldering is usually used to join non-ferrous metals. Welding is when the base metal is heated to a point where it will melt and , with the filler metal, becomes part of the weldment. In other words, the two pieces become one, and the resulting weld is now a blend of base metal and filler metal.
soldering is a very low heat (melting temperature of the soldering alloy is less than 840 degrees Fahrenheit), semi-adhesion process, final product: 2 base materials, and a filler material on top. welding is high heat fusion process, final product: a solid blended material
really thick really thick! That's a really thick answer. What people need to know is that 22 refers to Standard sheet and Wire Gauge. See: http://www.mig-welding.co.uk/forum/showthread.php?t=4143 Far from being thick it is rather thin especially if you want to weld it. It is 0.7mm
Steel is essentially native iron with carbon or other elements added, so all steels are potentially magnetic.
Many electrical transformers use a version of mild steel, called "transformer steel".
Stalloy (a silicon steel alloy) is one example.
High-performance audio transformers use more complex alloys such as mu-metal (nickel-iron-copper-molybdenum).
Stainless steel has high concentrations of nickel/chromium, and these high concentrations make most stainless steel alloys non-magnetic.
Magnetic stainless steel has weak magnetic properties, so it is not a practical magnetic material.
Stainless steel is categorized by AISI Type. Some are magnetic. Generally any steel with or at or over 11% Chromium is a stainless steel. The 200 and 300 series are not magnetic, however the 400 series is magnetic. The 400 series has enough Iron and Carbon to allow it to be heat treated to harden it. Most stainless steel knife blades are hardened 421 stainless steel and are magnetic.
Some stainless steel is attracted by magnets, but most is not. It depends on the composition of the alloy and how it has been processed. Stainless steel is an alloy of steel, chromium and sometimes nickel. The metal has a crystalline structure that is not easily penetrated by magnetic flux (it has a low magnetic permeability).
Some forms of stainless steel, particularly those without nickel, are attracted by magnets.
However, it is the structure, not just the composition, of the steel that affects whether it will be attracted by a magnet. This can be observed in some stainless steel sinks: a magnet will not be attracted to the bowl of the sink except in the corners, where the steel has been stretched.
Maybe.
Some kinds of stainless steel are "nonmagnetic". Exactly what that means varies depending on the exact composition of the steel and its history (cold working or welding tend to make individual pieces "more magnetic").
About all that can be said for certain is that most types of "stainless" steel alloys are less magnetic than iron is.
Yes, since stainless steel is a majority iron with some chromium (10-30 wt%) and a smaller amount of other elements such as carbon (less than 0.20%), it will still be ferromagnetic and be attracted to a magnet.
Is steel harder than aluminum?
The question may better be written as, "Which steel is harder than which aluminum?" There are many grades of both, and some alloys of aluminum are actually harder than some grades of steel. For instance, 7075-T6 aluminum at 150 Brinell hardness is harder than low-carbon steel at 120 Brinell. Generally speaking, however, steel is harder than aluminum.
How do you convert rotary motion to reciprocating motion?
Using a slider crank opposite to the conventional sense, (ie, input to the slider and output obtained at the crank) should do the job. This should help you : http://www.youtube.com/watch?v=PZO-BhkWIMM
An expansion bus is made up of electronic pathways which move information between the code of a computer system, including the CPU and RAM, and peripheral devices. It is a collection of wires and protocols that allows for the expansion of a computer
How can calculate tor steel weight?
=3.14 x d2 /4 x 7850x1m
=3.14x(8)2/4 x7850
=50.24x 7850
=394384x1m
=394383/(1000x1000)
=0.394
=0.394kg/m
How to design a steam turbine?
-Check turbo generator lube oil sump level and drain it for water. Replenish it if level is less than normal.
-Start the lube oil priming pump from the local station and check the lube oil pressure. Put the priming pump on auto.
-Check and fill up the Turbine Generator vacuum pump operating water tank to normal level.
-Check vacuum condenser condensate level from the condensate pump. Put the pump on auto so that the level is maintained all the time.
-Operate the steam drain valve to drain any condensed water from the steam line to avoid excessive hammering and vibration while starting turbo generator.
-Open the main steam inlet valve for turbo generator.
-Adjust the gland steam pressure to normal level.
-Check and open the sea water valves for vacuum pump cooler, T/G lube oil cooler and vacuum condenser are opened.
-Start the vacuum pump and bring up the vacuum in the condenser.
-Open condensate pump valves and switch on the pump.
-Check whether the condensate vacuum, gland steam pressure, steam inlet pressure, and lube oil pressure are normal.
-Start turbo generator from the local station and close the drain in the steam line.
-Check first and second stage steam pressure.
-Check condenser vacuum and water level.
-Check lube oil pressure and vibration levels.
-Check turbo generator speed, voltage, frequency, vacuum, condenser level and other parameters.
-Give control to remote station from the local control and take the TG on load.
Pneumatics is the when you use compressed air to move a pistion, a pistion could be virtually many things. ---- It is just like a hydraulic system but instead of a fluid you use air as the working fluid.
What are normal job benefits for a mechanical engineer?
Mechanical Engineers are typically provided with medical, dental, and vision coverage through their employer. Starting engineers at a company are usually compensated with 2 weeks paid vacation at most companies, and that time builds the longer you work for a company. Most employers also have a modest 401k plan or other similar retirement accounts.
What is windage loss of motor?
Windage loss is essentially frictional losses acting on rotating members due to air resistance.
Mythbusters did a Good show on one way.
You can do things like De-chroming and removing external mirrors and such.
The under side of the car can be changed using air dams and sheets of flat material.
And about a million other things.
