Mechanical Engineering

MPa is the shortened form of Mega Pascal. Mega is the SI prefix for a magnitude of 1x106 and Pascal is the SI unit of stress, where 1 Pascal is equal to 1N/m2.

1 Newton is in turn equal to the force required to accelerate a 1kg mass at 1m/s2.

Both are two different scales of hardness measurement.

The coefficient of linear thermal expansion measures the change in length per unit length of a material per unit change in temperature. Expressed as in/in/°F or cm/cm/°C, the CLTE is used to calculate the dimensional change resulting from thermal expansion. CLTE is especially important when components of an assembly have widely varying thermal expansion coefficients. Thermal expansion of a material is another important design factor, particularly in applications where plastic parts composed of Bayblend ET1000 resin are mated with metal parts or parts having metal inserts. Coefficient of linear thermal expansion was measured on injection molded samples according to ASTM D 696. Injection molding of these samples provided better consistency on repeat testing than values from sheet-extruded samples, though the numbers were close. Molding under ISO conditions minimizes molded-in orientation and results in more accurate values. Material in/in/°F x 10-5 cm/cm/°C x 10-5 Liquid Crystal (glass reinforced) 0.3 0.6 Polycarbonate (glass reinforced) 1.2 2.2 Nylon (glass reinforced) 1.3 2.3 TP Polyester (glass reinforced) 1.4 2.5 ABS (glass reinforced) 1.7 3.1 Polypropylene (glass reinforced) 1.8 3.2 Epoxy (glass reinforced) 2.0 3.6 Polyphenylene sulfide (glass reinforced) 2.0 3.6 Acetal (glass reinforced) 2.2 4.0 Epoxy 3.0 5.4 Polycarbonate 3.6 6.5 Acrylic 3.8 6.8 ABS 4.0 7.2 Nylon 4.5 8.1 Acetal 4.8 8.5 Polypropylene 4.8 (.000048) 8.6 TP Polyester 6.9 12.4 Polyethylene 7.2 13.0 Note: Above table factors are averaged for a given plastic type; thus, the factor will vary depending upon the actual grade of given plastic type. POLYPROPYLENE EXAMPLE: Factor Distance Temp. Chng. Expansion .000048 x 24" = .001152 x 60 DegF = .0690"

as mechanical maintenance engineer following responsibility

1.doing preventive maintenance and keep machine condition good as possible.

2.finding machine requirement in running condition

3.attend machine breakdown and find the route course of same

4.check machine all spare parts and constable items stock as required.

Difficult question to answer without context. Key thing to understand is a pneumatic system uses a compressor, whereas a hydraulic system uses a pump.

Hydraulic fluid is essentially incompressible, whereas compressed air will fill any volume.

Ask yourself: What is my pneumatic/hydraulic system supposed to do?

How fast should it react and what horsepower is available to drive my compressor/pump? What force do I need at my actuator/motor or whatever the system is expected to power?

Generally, I think pneumatic systems can react more quickly but power density is lower, so if the load is very high a hydraulic system might be better.

A typical shop pneumatic system might only operate at 50psi, whereas a hydraulic system can operate at 3000psi.

Finally, it's also worth thinking about system safety: if a pneumatic component fails, there will be an explosive decompression, but if a hydraulic component fails, it will leak but will not explode because hydraulic fluid does not store energy, it only transmits it.

For example the cause of sliding friction of two materials is when the stress between the Materials is not equal to zero

office supplies is one

Non-seemless pipe is rolled from a flat piece of metal and welded lengthways to form the piping. Seemless pipe is extruded and has no seems and is generally stronger.

Natural glucocorticoids are produced in the adrenal glands located immediately above the kidneys.

NACE MR0175/ISO 15156 describes general principles and gives requirements and recommendations for the selection and qualification of metallic materials for service in equipment used in oil and gas production and in natural gas sweetening plants in H2S-containing environments, where the failure of such equipment could pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion damage to the equipment itself. It supplements, but does not replace, the material requirements given in the appropriate design codes,

standards or regulations.

1. A shaft diameter

2. Length of bolt

3. Inside of a hub

A welding jig is a device designed to allow something being welded to be held such that the intended shape is made and can be repeatedly made using the jig. That way each unit coming out of the jig has the same dimensions.

the mechanical advantage would be 3 because you have to do 6 divided by 2.

System is in the equilibrium if all the forces (external and reactional - internal) are in the equilibrium - resulting force is zero vector.

Free body diagram is drawn for each body of the mechanical system. The body is disconnected from the system and contacts (sometimes called joints) are replaced by reactional forces. Then for each body equations of equilibrium can be written based on the principle of equilibrium.

In a transformer with a turns ratio equal to 1, the primary current comprises the reflected secondary current plus the magnetizing current necessary to sustain the "back EMF developed across the mutual inductance coupling the primary winding to the secondary. Therefore the primary current is always greater than the secondary current in a transformer with a turns ratio equal to 1. This should be evident by applying Kirchhoff's Current Law to the central node of the "T-equivalent" model of a transformer.

Wind turbines, used in combination with other kinds of renewable energy, can slow and eventually stop global warming if we also stop burning fossil fuels (coal, oil and natural gas).

wagons it has to constas of a rope or belt

Yes, it is.

The working conditions vary for a mechanical engineer depending on his job. Most positions are salary so the hours range based on the project you are working on. I've worked 30 hours one week and 60 the next. Most of the time your company will only want you to work about 40 hours a week.

Physical conditions for Mechanical engineering can be anywhere from a sit behind a computer doing sales consulting or CAD drawings, or it could be field work, where you are outside inspecting or repairing equipment. I depends on what field you find a mechanical engineering position in. When looking for a job, I got offers from working on a oil rig in the Gulf of Mexico to doing aluminum window designs in AutoCAD. No matter what your personality, there are job conditions that can fit what you are looking for. The best way to get them though is experience and that takes time.

Well, I am not sure about the state but I know that one of the Top 5 Countries to have the most wind turbines is UK.

Has 186 wind farms holding 2,120 electrical producing wind turbines

Can power over 1.5 million homes and saved up to 6 million tons of carbon

i heard its California

To convert breaking strain to safe working load you must establish a safety factor (SF). Assume SF of 10. If a line has a breaking strain of 1 tonne then you should only suspend or load the line to a strain of 100Kg (1000Kg/10) A common SF for normal use is 6. If human loads are in use then SF 10 is more common.

CPH also frequently called HCP - is Close Packed Hexagonal (or hexagonal close packed). It is an arrangement of atoms in a crystal structure.

It can mean quite a few other things, one of which is the IATA code for Copenhagen airport.

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