Mechanical Engineering

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.

Packing density affects performance by lowering the heat transfer capacity.

A non-positive shut off valve is one that is controlled by the user. You hold down the valve to keep the water or whatever coming out, and when you want it to stop, you release the valve.

Desmosomes

YIELD STRENGTH 242 N/sqmm

TENSILE STRENGTH 440~520 N/sqmm

The moon transit is the time that the moon crosses an observer's meridian. The time that a moon transit occurs relative to noon depends on the quarter that the moon is in.

Superheated steam.

The finish of a product would be considered as heavy gauge steel. For instance, an espresso maker could have a heavy gauge stainless steel finish.

why is it important only to strike the arc in the weld joint

By measuring outlet temperature of water at downstream of pump and upstream of boiler.

Pressure vessels fabricated to ASME Sec VIII Div 1 need to be U stamped. The vendor's facilities should qualify for fabrication of such vessels and audited at periodic intervals as specified in the code.

The benefits of fabricating to U stamp are

1) higher quality standards

2) competent authority involved in all stages for approval

3) uniformity of code requirements irrespective of geography

In generating, the geometry of the workpart is determined by the feed trajectory of the cutting tool. On the other hand in forming, the shape of the part is created by the geometry of the cutting tool.

In the foot-lb-sec (FPS) system, an appropriate unit would be cubic feet per second (CFS). A more common unit is gallons per minute (GPM). 1 GPM = .00223 CFS.

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

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.

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

The ASTM A-10 and, but it was discontinued and replaced by ASTM 283, the term mild steel is not recommendable for engineering use.

stainless steel

Basically . economiser is located in between exit of boiler and entry of air preheater. when the flue gases are coming out from boiler they take away a lot of heat. economiser utilize this heat from flue gases. and these heat is used to heat the feed water which is going to feed the bolier. hence by using economiser the coal consumption required to heat the feed water is reduced hence cost reduced.

A screw conveyor is basically a long tube that transport a certain material from a point A to a point B. The way in which the material is transported is by a helical screw, invented by Archimede almost 2000 years ago. It can transport material in any kind of inclination, from 0 degrees up to 90 degrees. It's used for many industrial purpose.

Steel with a carbon content above 2.0% is considered cast iron so the limit is 2.0%. Grey cast iron starting at 2.5% is basically a mix of ferrite carbides and graphite. Going higher above cast iron is pure carbide or Fe3C at 6.1%. Above that and it's basically a mix of iron graphites.

Sheet metal @ 8 gauge is 0.1644 inches for standard steel and 0.1285 for aluminum.

439, 931,933 and 934 are equivalent to ASTM 325 bolts in DIN standards. 439 is another bolt equivalent to a 325.

From the NYC scaffolding company in the 1920's: Chesebrough Whitney.