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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 the exit pressure of a nozzle?

How to calculate the ratio of the inlet-to-exit area of the nozzle

Can work the tig machine without argon?

The TIG (Tungsten Inert Gas) welding machine will work without the gas turned on (argon), but your weld will be contaminated due to exposure to the air and will likely crack, or have other defects in it (bubbles, etc).

Formula for calculating compressive strength of cylindrical body of concrete?

If the concrete sample has been tested in a uniaxial compressive test machine (which would be the normal destructive method of testing a cylindrical sample), then you would use the failure load divided by the cross sectional area of the cylinder to find the strength of the material.

Failure Stress = Uniaxial Compressive Strength = Force / Area

It should also be noted that concrete strength is more normally found by measuring "cube strength", that is where the concrete is pored into cube shaped moulds of 100 mm x 100 mm x 100 mm and is then allowed to cure for a period of time (typically 28 days). The concrete cube is then tested in a uniaxial test rig. The formula for calculating the strength is the same, however the major difference is in the preparation of the sample as described above.

Can pex water pipe be used outdoors?

The answer is no. Nearly all pipe manufactures will void their warranties if their product is exposed to direct sunlight for longer than allowed.

How do you install pro-e 3.0?

This is the ProEngineer 3.0 M90 Patch,but also work on ProEngineer Wildfire 4.0 C000

1.Insert the Pro/Engineer Disk 1 CD.

2.Autorun will open CD if not click Setup.exe

3.Take a look on the left corner in the bottom, that is your actual "HostID",remmember that number or write somewhere on paper.

4.In a "CRACK'' folder find file "ptc_li-4.0.dat" and copy somewhere on your HD.

5.Open "ptc_li-4.0.dat" with ''Notepad" and replace every occurance of with your "HostID" shown in the bottom left corner of the ProEngineer setup.The best an the fastest way is like this:

1a) Open "ptc_li-4.0.dat" with ''Notepad"

2a) In ''Notepad" klick "Edit" and "Replace" (Ctrl+H)

3a) in a "Find what:" paste ,''Replace with:" paste your "HostID" shown in the bottom left corner of the ProEngineer setup.

4a) Klick "Replace All"

5a) Klick "File" and "Save"

6a) Exit "Notepad"

6) Click "Next"

7) Check "I Accept the Agreement Terms and Conditions"

Cool Click "Next"

9) Click "Pro/Engineer Pro/Engineer Mechanica"

10) Change the Destination Folder to "C:Program FilesproeWildfire 4.0"

11) change the red X to ?Install this feature? for the following:

1b) Pro/Engineer Mechanica (If you want this with Pro/Engineer,if you don't want do not change)

12) Expand the "Options" feature change the red X to ?Install this feature? for the following:

1c) J2RE 1.4.1

2c) Mold Component Catalog

3c) Pro/Plastic Advisor

4c) VERICUT (R) for Pro/ENGINEER

IMPORTANT NOTE: Do not install the "J2RE 1.4.1" option if you already have a newer version installed on your system.

13) Click "Next"

14) Click "Add"

15) On license-config screen select "Locked license file (no server running)" and point to edit ptc_li-4.0.dat

16) Click "Next"

17) "Shortcut Location(s)",check "Desktop" and "Program Folder",change the Startup Directory to "C:tempProE" (this step is optional)

18) Click "Next"

19) On this screan is more optional configuration, make sure all boxes remain un-checked

20) Click "Install"

21) The installation process will begin?..

22) When ask you remove Disk 1 and insert Disk 2.

23) Click OK

24) The installation process will continue?.

25) Remove Disk 2 and insert Disk 3

26) Click OK

27) The installation process will continue?.

28) Remove Disk 3 and insert Disk 1

29) The installation process will continue automatically

30) When the installation is complete, click Next.

31) If anyone want to install and ''PTC Distributed Services" follow this steps: (this step is optional)

1d) After Installation is finished, click Next

2d) Click "Other Products" and than click ''PTC Distributed Services"

3d) Check "I Accept the Agreement Terms and Conditions"

4d) Change the Destination Folder to "C:Program Filesptc_distributed_services"

5d) Click "Next"

6d) On license-config screen select "Locked license file (no server running)" and point to edit ptc_li-4.0.dat

7d) Click "Next"

8d) "Shortcut Location(s)",check "Desktop" and "Program Folder",change the Startup Directory to "C:tempDistr" (this step is optional)

9d) Click "Install"

10d) The installation process will begin?..

11d) When ask you remove Disk 1 and insert Disk 2.

12d) Click OK

13d) The installation process will continue?.

14d) Remove Disk 2 and insert Disk 3

15d) Click OK

16d) The installation process will continue?.

17d) Remove Disk 3 and insert Disk 1

18d) The installation process will continue automatically

19d) When the installation is complete, click Next.

20d) Click Exit

Next Steps for CRACKING:

For ProEngineer:

1) Go to:

C:Program FilesproeWildfire 4.0i486_ntobj

and there copy and run "pro engineer.wildfire.4.0.generic-patch.exe"

If "Patch" ask you to search file click "NO'',don't worry for missed files,wait little,when you see "Patch complete" exit "Patch".

2) Start "Notepad",in notepad click "File" and than "Open" in this newley open window change "Files of type'' to "All Files" and then go to "C:Program FilesproeWildfire 4.0bin in this folder find file named "proev.bat" and open with notepad.Now you have a text file of .bat process.In the bottom of this text file find the string:

%start_cmd% "%CGTECH_JRE%binjavaw" -Dsun.java2d.noddraw=true -Xms24m -Xmx128m -Xss6m -classpath "%CGTECH_CLASSES%;%CGTECH_CLASSES%CGTech.jar" Vericut %argstr%

and add PTC_KEY=0 at the end,like this:

%start_cmd% "%CGTECH_JRE%binjavaw" -Dsun.java2d.noddraw=true -Xms24m -Xmx128m -Xss6m -classpath "%CGTECH_CLASSES%;%CGTECH_CLASSES%CGTech.jar" Vericut %argstr% PTC_KEY=0

Klick "File" in the notepad and then " Save",Exit notepad ("proev.bat")

For Pro/Engineer Mechanica: (if you don't install "Pro/Engineer Mechanica" skip this step)

pecmen

8 months ago For Pro/Engineer Mechanica: (if you don't install "Pro/Engineer Mechanica" skip this step)

1) Go to:

C:Program FilesproeWildfire 4.0mechi486_ntbin

C:Program FilesproeWildfire 4.0mechi486_ntptc

C:Program FilesproeWildfire 4.0i486_ntobj

and there copy and run "ptc.pro mechanica.wildfire.4.0.generic-patch.exe"

For ProDistributed Services: (if you don't install "ProDistributed Services" skip this step)

1) Go to:

C:Program Filesptc_distributed_servicesi486_ntobj

and there copy and run "ptc.distributed.services.generic-patch.exe"

That's it!Enjoy (NOT!!!!)

Why would you put soap or wax on a screw driver?

If you are trying to get a screw to stay on the screwdriver blade when you can't reach in with your fingers to start the screw. Soap or wax can also be applied to a wood screw's threads to get it to screw into hardwoods more easily. Beeswax is traditionally used by carpenters.

Why are cast iron disc rotors used on vehicles?

becauase it has high resistance and long life and good in environment impact

How does a pedalo work?

Basically, it's a pedal-driven paddle boat- the driver rotates a pair of pedals with their feet like bicycle pedals, which are linked by a connecting rod to one or two paddle wheels located between, or either side of, the pedals. This has the effect of powering the boat through the water.

What is the cause of rapid wear at shoulders of a tire?

Over or under inflation of the tires can cause shoulder wear. A misaligned front end can also cause this.

What does structural foreman means?

A Structural Foreman would be the site supervisor on a project that is concerned primarily with the structural components of the project. These would include, but not be limited to, those items that hold up the roofing, flooring, walls, etc.

Difference between a natural aspirated and turbocharged engine in terms of a Pressure vs Volume diagram?

Naturally aspirated engine are simply better than a smaller turbo charged engine. It has greater torque and no need for maintenance. You also have better control of the car while driving-(racing)

Why you not use leaf springs in place of helical springs in trains?

because these springs are long in length & more over less suspension system.

Why a metal alloy behaves differently to a pure metal?

A metal alloy behaves differently than a pure metal because the different chemical properties of the metals in an alloy both contribute to the alloy's properties. Certain alloys may be stronger than the original metals because one metal may fill a "gap" in the other's structure. Of course, other properties besides strength are also changed in an alloy.

What is a direct axial load?

It is a load applied in the axis of the member perpendicular (normal) to the cross section.

Is there is scope for mechanical engineering?

There is a wide scope for mechanical engineering worldwide.mechanical engineers are the second highest employed engineers among all others with only 7% unemployed whereas any normal engineering stream would have around 15% unemployed engineers worldwide.we have the automobile industry,oil and gas production companies,aeronautical field,cement industries,design sector,chemical industries,heavy machinery sector,information technology,defense and above all the booming construction field always waiting on for mechanical engineers with lucrative pays and packages.

How cold cracking happen in welding process?

Heat expands, cold contracts... When you weld, the 2 metals will expand toward each other. once your done, they will try to pull apart. not enough filler rod, not clamping, rapid cooling, undercut, wrong filler rod, are just a few causes of cracks

What is solid position?

Solid position is a state of matter. it is difficult to manipulate due to its structure. It has no space inside, its made entirely of specified material.

What is the electro mechanical age?

The electromechanical age was from 1840 to 1940. During this time period, the key advance was finding ways to harness electricity.

High pressure steam turns the blades of?

High pressure steam hits the blades of a TURBINE and turns its shaft.