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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

Is there any difference between astm a105 and astm a105n?

ASTM A105N is different from A105. The A105 is classed "as forged" as opposed to A105N where the 'N' stands for normalized i.e. it has been heat treated to remove the internal stresses caused by casting, forming etc. If a customer specifically asks for A105N then it will be for a good reason. The normalizing heat treatment will ensure the A105N has superior properties to that of the A105. The 'N' is not a category code, the A105 should be normalized if intended for use below -1 C. There are API regulations that go further into it that you should read up on, primarily API RP14E. Hope this helps

What is the part of a bell that hangs down and hits the side of bell?

The bell is considered a percussion instrument. The part of a bell that clangs the sides to make the noise is called the clapper.

Why are fan wings slightly curved?

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What is the material composition of EN 10029?

Please see Table 1: Chemical composition (ladle analysis, %) as per SANS 50025 / EN 10025 of the first page of the related link.

What is feed engineering?

FEED stands for Front End Engineering Design. It includes robust planning and design early in a project's lifecycle (i.e., the front end of a project), at a time when the ability to influence changes in design is relatively high and the cost to make those changes is relatively low. It typically applies to industries with highly capital intensive, long lifecycle projects. Though it often adds a small amount of time and cost to the early portion of a project, these costs are minor compared to the alternative of the costs and effort required to make changes at a later stage in the project.

What is the maximum suction head for pumping water?

I think, that's refer from your system. If you manipulate the surface pressure of the water, you will get a big value of water suction head with higher surface pressure.

CMIIW....

Does scfh and cfh mean the same?

scfh is "standard cubic feet per hour" and cfh doesn't neccessarily mean "standard". Standard conditions are stanard temperature (293 K), and standard pressure (1 atm, 101,300 Pa).

What is the tensile strength of .375 bolt?

Tensile strength is a material propery, it does not depend on size. Look at a material chart to find its yield and tensile strenghts.

Then use the stress equation, Stress = Force / Area to determine if your .375 bolt can handle the force on it.

If your bolt is in shear, you need to find Shear strenghts.

What is the difference between induced and forced draft cooling tower?

  • Induced draft --- A mechanical draft tower with a fan at the discharge (at the top) which pulls air up through the tower. The fan induces hot moist air out the discharge. This produces low entering and high exiting air velocities, reducing the possibility of recirculation in which discharged air flows back into the air intake. This fan/fin arrangement is also known as draw-through

    . (see Image 3)

  • Forced draft --- A mechanical draft tower with a blower type fan at the intake. The fan forces air into the tower, creating high entering and low exiting air velocities. The low exiting velocity is much more susceptible to recirculation. With the fan on the air intake, the fan is more susceptible to complications due to freezing conditions. Another disadvantage is that a forced draft design typically requires more motor horsepower than an equivalent induced draft design. The benefit of the forced draft design is its ability to work with high static pressure. Such setups can be installed in more-confined

    spaces and even in some indoor situations. This fan/fill geometry is also known as blow-through

    .

  • When did mechanical engineering started?

    When the first humans made ​​their first tools.

    What is love joy coupling?

    Lovejoy is the legacy company/brand behind the original straight jaw flexible coupling. A Lovejoy flexible jaw coupling is comprised of two hubs and an elastomeric spider that accommodates minor misalignment and avoid metal to metal torque transmission between the hubs. One main advantage is that it can still work during slightly failed condition. If the spider fails or wears away, the jaws of the two hubs will generally engage with each other and continue carrying torque for some period of time. This type of coupling is generally resistant to dirt, moisture, sand and grease. These couplings come with a wide selection of hub and spider materials to handle a wide array of operating temperatures and torque transmission requirements.

    Is steel gauge thickness and wire gauge thickness the same?

    They are close but not the same. For example, 14 gauge steel is .0781 inches thick while 14 gauge steel wire is .083 inches thick.

    What navigational aids did the Muslims develop?

    Muslim scientists compiled their knowledge of seasonal weather, tides, prevailing winds, sea currents as well as astral-navigation to create navigational tools. These tools included astronomical tables and navigational tables for navigators. They are responsible for the invention of the Astrolab, as well as innovations in cartography.

    What is SMAW process?

    SMAW stands for Shielded Metal Arc Welding. This process uses electrodes with flux coating, which release gases to surround the weld metal, thereby preventing oxidation.

    Why the machining of brittle material is easy than ductile material?

    Very ductile material will often smear rather than cut during machining operations. Less ductile material (more brittle) will cut more easily.

    Why is an oar a class 2 lever?

    An oar is a class 3 lever. This is because the oar, like all class 3 levers, is not used to reduce the force needed to move the load, but is used to increase the amount of travel of the load.

    Why martensite is so hard and brittle?

    For two reasons: 1. martensite is bct structure which prevent the movement of dislocations. 2. martensite has higher carbon concentraton.

    Why in steam turbine maintain steam temp 535 degree Celsius?

    IT is not accurately 535 c.... The water should be in the super heated condition... So we go to like a higher temperature region and also higher pressure region to change the steam as super heated steam and then the steam is allowed to expand in the steam turbine... now the power gained is much higher than the water flowes at saturated condition like (200 c - 300 c )... so only we are moving to higher temperature and higher pressure region