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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
The test section RHOMBUS of a supersonic wind tunnel makes flow uniform in test section?
Using shock-expansion cancellation technique flow in the diverging part of a supersonic nozzle is brought back to free stream direction ( direction parallel to the axis of nozzle) where a rhombus shaped region(Test Section) is formed in which uniform flow is ensured. Refer Method Of Characteristics from Rathakrishnan For Diagram.
Explain about the Tool Steels?
Tool Steel is a specific type of high quality steel made specifically for the production of tools and tooling components. Tool steels are produced in electric melt furnaces and stringent quality standards are upheld to produce the necessary quality. Tool steels are formulated to withstand high pressures and abrasive materials.
Typically tool steels are used for shearing, cutting, stamping, and forming of metals and plastics. Example applications include compacting of powder metal into a gear form, slitting of steel coils into strips, stamping of computer parts from metal sheets, extrusion of plastic or vinyl into window frames and formation of cutting tools from high-speed tool steels.
Tool steels are supplied in the annealed or soft condition, so that they may be machined and fabricated into a tooling component. These steels are designed to be used in the hardened condition, so after they have been fabricated into a tool, they must be heat treated to obtain the desired properties.
The properties that tool steels provide are hardness, toughness, wear resistance and red hardness. For a further explanation of these properties, see our article Properties of Tool Steels. These properties are provided in varying degrees from a wide selection of tool steel grades. These grades fall into three basic classes of tool steels. These classes are cold work tool steels, hot work tool steels and high-speed tool steels. These classes are also divided into sub-classes. Cold work tool steels are generally divided into Water-hardening, Oil-hardening, Air-hardening, Shock-resistant and special purpose tool steels. High-speed tool steels contain high levels of cobalt, tungten and/or molybdenum and are designed to be used at elevated temperatures while still providing a high level of hardness and wear resistance to facilitate cutting of metals. High-speed steels are sub-divided into tungsten and molybdenum sub-classes.
Tool steels usually contain from 0.5% to 2.5% carbon. This level of carbon is necessary to combine with the carbide forming elements in the tool steels. These carbide-forming elements, when combined with the carbon, provide the necessary hardness and wear resistance.
For more information on tool steels and their properties visit www.simplytoolsteel.com
What is the weight of 1mm thick x 1000mm x 1000mm galvonised iron sheet?
The weight of 1 mm thick x 1000 mm x 1000 mm galvanized iron sheet is 7.85 kilogram. This is based on taking the density of the iron sheet to be 7850kg per cubic meter.
What is the caloric value of diesel oil?
The higher calorific value of diesel oil is 44,800 kj/kg and 19,300 btu/lb. The lower calorific value of diesel oil is 43,400 kj/kg.
What is the diameter of a weaver's beam?
And the staff of his spear was like a weaver's beam; and his spear's head weighed six hundred shekels of iron: and one bearing a shield went before him.
His spear's head weighed six hundred shekels of iron] That is, his spear's head was of iron, and it weighed six hundred shekels; this, according to the former computation, would amount to eighteen pounds twelve ounces.
And one bearing a shield] hnxh hatstsinnah, from xmb[r tsan, pointed or penetrating, if it do not mean some kind of a lance, must mean a shield, with what is called the umbo, a sharp protuberance, in the middle, with which they could as effectually annoy their enemies as defend themselves. Many of the old Highland targets were made with a projecting dagger in the center. Taking the proportions of things unknown to those known, the armour of Goliath is supposed to have weighed not less than twohundred and seventy-two pounds thirteen ounces! Plutarch informs us that the ordinary weight of a soldier's panoply, or complete armour, was one talent, or sixty pounds; and that one Alcimus, in the army of Demetrius, was considered as a prodigy, because his panoply weighed two talents, or one hundred and twenty pounds.
Why is it necessary to indicate the spindle of a mill?
It's used to assure that the spindle and the work table are perpendicular to one another. It refers to movement along the mills Z axis.
How Do You Screw A Coat Hook In To A Wall?
In order to screw a coat hook to the wall you need a drill. Additional metal plates may be necessary to keep the coat hook to the wall.
The starter solenoid might be bad. Try running a wire from the positive post to the starter and see if turns. If it does, solenoid probably bad. Also, check to make sure ground was put all the way back on and to make sure that the ground is still hooked to the body of the mower. Good Luck!!!
What is liquid holdup in a column?
'Liquid Hold-up' in a distillation column refers to down-coming liquid (liquid traffic travelling down the column) becoming trapped in the column's packing material.
Packing material is used in distillation columns to increase the contact efficiency between the down-coming liquid stream(s) and the up-flowing vapour stream(s). The packing materials do this by increasing the surface-to-volume ratio over which the vapour and liquid streams come into contact in order to promote separation between the more volatile and less volatile components in the column.
The down-coming liquid can become trapped in the packing material for a number of reasons. One example is when liquid becomes trapped in crack formations or fractures of the packing material (which can occur during normal or non-steady state column operation). When the liquid becomes trapped in these cracks/crevices, contact with the up-flowing vapour stream becomes non-existent and the liquid is literally 'held up' from travelling down the column.
In which of the following units is acceleration expressed? A. newtons B. Foot-pounds C. Kilograms D. MetersPer Second Squared In which of the following units is acceleration expressed? A. newtons B. Foot-pounds C. Kilograms D. MetersPer Second Squared
What is a closed loop condensate system?
If I understand what you are asking, you are describing a steam cycle system.
First water is pressurized and pumped via a condensate pump (the water is called condensate. This condensate normally goes through a heater to increase efficiency, then is further pressurized by feed pumps. The water (now called Feed Water) is then sent through a control valve and into a steam generator (basically a large tea kettle). The control valve maintains constant water level in the generator within a certain range. The water in the generator is heated by various ways (Oil, Coal, Nuclear, Geothermal or even Solar reflectors). The steam produced is directed to do whatever work the system is designed to do, either heating, electricity generation, propulsion (steam locomotive / Steam powered ship). Once the steam has been used to produce work, it is at a lower temperature and pressure than it was in the generator. This low pressure steam can be directed to the condensate heater (as described above) then to a condenser, or straight to the condenser. The condenser uses various ways to further cool the steam; (water, cooling towers ;those big towers at nuclear power plants) and the resulting condensate is collected to be reused. The reason why it is called a closed loop system is that the water is re-used time and again in a loop. The water is only added to make up for leaks in the system (thus it is called make up water).
What is profile measurement using profile projector?
The profile measurement using a profile project gives the accurate length of a given a profile. A profile projector provides a very accurate profile measurement of the same.
what is a proportional valve. have a 1992 dodge Dakota and it needs a new one I am told. need a schematic diagram of a braking system to locate it.
State any three common green sand process defect and give their causes and remedies?
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Power plant based objective type question answer?
objectives of the power engineer in a plant is to monitor that the plant is operating efficiently and and repairing as necessary
The formula for a press tool depends on what you're trying to calculate. For example, if you're interested in cutting force, the formula is the shear area times the shear strength.
What is the density of aluminized steel?
The density of aluminized steel is 2710. Additionally, the density of its counterpart, carbon steel, is slightly different at 2833.
Materials which transmit no light are referred to as?
Materials which do not allow the transmission of light are called opaque. These substances have chemical compositions, some of which are referred to as absorption centers. This means that the material absorbs all of the light wave frequencies, not just some while reflecting other frequencies.
History of diesel power plant?
in 1913, Rudolph Diesel proposed a new type of internal combustion engine that had more pressure. This raised the temperature of the gas in the cylinder. This, then, allowed a lower grade of fuel to be used instead of highly combustible gasoline.
Famas or steyr aug rifle is better?
the AUG is better. the previous answer was made by a man who researched them but i have more experience with them. i am a personal owner of both. although the Famas is newer and has more modes of fire. the AUG is more accurate. the famas's accuracy suffers at over 100 yards while a coffee cup is an easy target for the AUG at the same range. the Famas also requires more maitenance than the AUG. the Famas requires a replacement for the firing pin every 20,000 shots. the AUG only requires a replacement for it every 50,000 shots. it also has a higher rate of fire and maintains long distance accuracy for every shot of its 60 round extended Magazine. the AUG wins hands down
In a damped free excitation system when does maximum amplitude occur?
it will occur just before the resonance.
How do you find across corner of the hexagonal nut by only using Across flat thickness?
2*((flat dist/2)/0.866) Or in words: Take half the flat distance, divide that by 0.866, multiply the result by 2. You can derive this yourself by drawing a hexagon and drawing in the lines you want through the exact center of the hexagon. You will discover this makes two right triangles, the hypotenuses of which are the "across corners", and the "long sides" of which are the "across flats". By inspection, there are 12 of these triangles, meaning the small angle of each is 30 degrees. The cosine of 30 degrees is 0.866, which is the ratio of each triangle's "long side" to their hypotenuse. Do the math and you will come up with the formula above. Cheers!
