Mechanical Engineering

SS stand for Structural Steel,400 for grade, AISI 1018, En 1a, St37 are equivalent steel.

Basically there is no difference as pipe is ussually stenciled with both standards.

To convert cmh to cfm .....

divide cmh by 1.7 to convert into cfm....

By definition, welding must exceed 800 degrees F, and depending on what is being welded, the temperatures may well exceed 1,200 degrees F.

The efficiency depends primarily on size (different manufacturtes have use similar designs). Bigger Gas Turbines tend to more effiecient. Additional factors such as waste heat recovery and heat exchangers can improve the system efficiency (but not the effiecency of the actual Gas Tubine).

Smaller gas turbines such as the Rolls Royce Avons have around 25% Thermal Efficiency while larger units such as the Rolls Royce Trent-50 have efficiencies of around 42%. A full list of Tubine Efficiencies for different manufacturers can be found at http://www.vibronurse.com/turbmath.HTML

Note that the above comment does not make the Avon a bad unit its simply the case that it is designed primarily for a high power to weight ratio. Some people will also quote very high figures for G.E Frame machines (+50%) but these numbers usually include co-gen (a steam turbine used to recover waste heat) and are therefor not just Gas Turbine Efficiency.

The full calculation for calculating Gas Turbine effieciency is avalaible at VibroNurse at the following page (http://www.vibronurse.com/turbmath.HTML) and program which does the calculation is available at http://www.vibronurse.com/gaseff.HTML. We use this program at our oil and gas platforms and it works well particlauarly as a condition monitoring tool.

The original "full-size" PCI card is specified as a height of 107 mm (4.2 inches) and a depth of 312 mm (12.283 inches). The height includes the edge card connector. However, most modern PCI cards are half-length or smaller. The half-length PCI card(now the standard) is 0.6 inch in width, 6.9 inches in depth and 4.2 inches in height. Link to How Stuff Works: http://computer.howstuffworks.com/pci.htm

Yes, like the dynamo on a bicycle that provides power for the light, instead it can run an electric motor with the help of a few cheap diodes(Bridge diode setup)

the engine is having high pressure inside the combustion chamber.the flow has to move trough nozzle.incase the pressure is very high at nozzle compared to the intake pressure the flow moves forward.then the compressors shape changed it is not enough to compress the intake air.it is compressor stall

An 800cc engine has a size of 800 cubic centimeters. This kind of engine would likely be found on a motorcycle or four wheeler.

The Elastic Modulus (aka Young's Modulus) for annealed 304 stainless steel is 193 GPa.

More data is available at: http://www.azom.com/details.asp?ArticleID=965

Air conditioner system senses the room temperature and then decides how much cooling has to be provided to room as per the setting. Say u need only 20 degree Celsius only.

To elaborate, in a closed loop system, the output in some way shape or form is fed back into the input of the control system. With an air conditioning system, the output is temperature. This temperature is read, and fed back into the control system to determine if additional cooling is needed or not.

An example of an open loop system would be if you programmed the air conditioning to turn on from 11AM to 5PM, then turn off. The output of the system (temperature) doesn't effect the input (when the system runs).

God of the motors. just ask milwaukee

the main difference between them is the way that energy is added to the fluid to be converted to pressure increase.

In dynamic pumps, energy is added to the fluid continuously through the rotary motion of the blades. These rotating blades raise the momentum of fluid and the momentum then is converted to pressure energy through diffuser in pump outlet.

In positive displacement pumps, the energy is added periodically to the fluid. the pump has reciprocating motion by pistons for example. When the fluid enters the pump through valves, the reciprocating piston begins to press the fluid resulting in going out of the pump with pressure rise.

what's happen for Super RTL channel on hotbird? Why it is disappear any more on hotbird ?

There's not a lot to go wrong in a transformer. You can test with an ohm meter (resistance meter) to check that the wires aren't broken if you know what the connections are. It will read low around 10 ohms if the wires are OK and will read very high if they aren't.

However there is a slight possibility that if it is damaged some of the wires may have shorted out so it will still read OK but will overheat when you put full power on it. So you need to power it up and check the output is what it should be with a voltmeter set on AC for a suitable scale.

Be careful not to electrocute yourself.

To allow for the expansion of tracks due to temperature variance. If this is not done, under certain conditions (high temp) the tracks will push against one another and bow outward or inward.

This is common in building - bridges, hardwood floors, generators, etc.

The ASTM equivalent for BS EN 10264-2 is AST A342. These designations are set for steel wires and wire products

12€ a kilo

Is resistant to stress. To be good casting. Cheap.

For finding reactions for simply supported beam with uniformly distributed load, first we have to convert the u.d.l into a single point load. And then we have to consider it to be a simply supported beam with a point load and solve it. I think you know how to calculate the reactions for beam with point load.

A closed loop system for the purpose of feeding back the output signal to the input side requires sophisticated sensors, which make this scheme expensive to implement. Initial tuning of the system is also difficult(feedback serves the purpose of fine tuning).

Anything that works on a Battery is a DC (Direct Current) like Cellphone, Flashlight, ipad, ipod and you laptop.

micron is bigger than nanometer. millianth part of meter is micron and billianth part of meter is nanometer.

Think of a jig saw blade, in and out. Or a Sawz-all, which is actually a reciprocating saw.

Or a click pen, a button on a phone, a hand saw, your eyelids, pistons, bike pump.