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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 a rotating shaft?

There are many, many examples. Generally, rotating shafts are used to transmit power from a producer to a user device. A few examples: Drive shaft in an automobile- transmits power from the engine to the wheels. Propeller shaft in a ship- transmits power form the engine to the propeller. Pump shaft- transmits power from a motor to the pump impeller. Rotating shafts are all over the place. You can find dozens of examples in the typical appliances in any typical home.

What is the difference between SMACNA and DW144?

Both methods are using in HVAC Ducting work mostly about 99% that smacna is using in that same.

Can someone tell me what kind of automatic level I have. Cant find any information on it anywhere. Its a East Coast Instruments ECI-240 Magn 24x stadia 100 1 Light grey in color and works just fine.?

It's seems as though you have answered the question yourself. You have stated exactly what it is (manufacture and model number). It was made in China and their exclusive distributor here in the US is "Instrument Sales & Service" out of Wilmington, DE. In case you need it, their number is 1-800-874-7637.

Is an insulator hot or cold?

Thermal insulators feel warm to the touch, as they do not conduct much heat away from your hand. The insulator itself will be at ambiant temperature once equilibrium has been reached and so is the same temperature as its surroundings.

Is there a liquid with high tensile strength?

Liquids do not have tensile strength. The equivalent property is viscosity.

The main difference between cast-iron and steel?

Steel is an alloy of carbon and iron. If the percentage of carbon is more than 2% then it is called cast iron.

What is the use of abort switch for notifier fire suppression system by honeywell?

To stop the release of fire suppression when in release mode. You have 30 seconds to press and hold this button. If you release the button in will discharge. It is a type 2 abort. Also know as a dead-mans abort.

What is the equivalent EN material for ETG 100?

what is the US equivalent of ETG100 and ETG 80 and PR80

What is ASTM A792?

ASTM A792 is a standard developed by ASTM International. The full title is ASTM A792/A792M-08 Standard Specification for Steel Sheet, 55% Aluminum-Zinc Alloy-Coated by the Hot-Dip Process. A792 covers 55% aluminum-zinc alloy-coated steel sheets in coils and cut lengths for applications requiring corrosion resistance or heat resistance or both. For more information, please visit www.astm.org.

What is the function of an eccentric pipe reducer in the suction side of a pump?



if we use concentric reducer at suction of pipe ,due to high turbulence flow of fluid ,some vapour pressure generate which generate bad effects on impeller of pump ,which decrease pump efficiency , so to avoid this problem the eccentric reducer's use in pump suction

Why Clearence is Provider in Cotter Joint?

Clearances between the cotter and slots in the rod end and socket allows the driven cotter to draw together the two parts of the joint until the socket end comes in contact with the cotter on the rod end.

Do the pipline losses reduce after the pipeline are in use for 1 year or so?

No. The pressure drop remains the same. The only thing that could led to a smaller pressure drop after 1 (or more) year, is the internal surface friction coefficient. But this coefficient does not change in a measurable way. Perhaps small particles are re-arranged inside the pipe, but the coefficient remains the same. So does pressure drop.

Why does the shaping tool move faster during the return stroke?

During the return stroke it does not remove any material, it is an idle stroke so to improve the cutting efficiency it will move faster during the return stroke.

Pradip Kotak.

What is battery limit in piping design engineering?

Unit plot plans are generally defined by imaginary lines called battery limits. Battery limits are used to establish a unit's boundaries. Unit plot plans show the location of all the buildings, equipment, pipe racks, and other items of importance in the unit. True north and plant north are also shown. The purpose of this drawing is not to show detail, but rather, the arrangement of various components to be erected in the unit.

Why beta is not there in iron carbon phase diagram?

actually there is no difference in beta phase and alpha phase when we talk about crystal structure of iron.

beta phase has the same structure as the alpha phase. the olny difference is the magnetic properties which are absent in beta phase due to the expanded lattice parameter.

What is post weld heat treatment?

post weld heat treatment is done on the weld areas after welding, to remove the residual stress present in the welded part formed during the welding process, it prevents to cause brittle fracture in a metal

Is that possible to be a IT professional after complete B-Tech in mechanical engineering?

is that possible to be a IT professional after complete B-Tech in mechanical engineering?

What do CNC operators do?

A CNC operator, as the name suggests operates a CNC (computer numerical control) machine, usually this includes loading and unloading workpieces, checking workpieces, setting program datums, setting up jigs and fixtures, replacing worn or broken tooling, cleaning swarf from the machine and basic machine maintenance. Some operators also do programming although this is usually limited to altering a program to suit the tools being used; for example altering a program to give the correct drill depth after changing the drill. The exact duties of a CNC operator varies from one machine shop to another. A CNC programmer actually writes the program that runs the machine although this job is increasingly done by software.

Determine the units of a caterpillar's speed if you measure the distance the catapillar travels in centimeters and the time it takes to travel this distance in minutes?

determine the units of a caterpillar's speed if you measure the distance the caterpillar travels in centimeters and the time it takes to travels this distance in minute

When centralised ac system used?

For big buildings like hospitals, hotels, airports, industrial buildings, and residential apartments the centralised air conditioning system is used.