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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 the difference between A106 and A234?
La norma o estándar ASTM A234 es una especificación para los accesorios para tubos de acero que incluyen materiales de carbono y acero aleado para servicios de media y alta temperatura.
La materia prima fuente de los accesorios de tubería de acero ASTM A234 WPB puede ser de tubería de acero, como ASTM A106 Gr.B y C.
Why brayton cycle is not used in reciprocating engine?
The Brayton
Cycle originally was used as a reciprocating, not a turbine, engine and in fact was used to power the U.S.
Navy's first engine powered submarine.
The drawback to reciprocating Brayton
engines is that they operate on low pressure ratios (typically 3:1 for a recuperated cycle) and require a large volume flowrate
of air to make power. Turbines can turn at very high speed and can move large volumes of air in a fairly compact package. Reciprocating engines turn much slower and so, with a Brayton
cycle, they become fairly large.
Nevertheless, there are enough advantages that you will soon see reciprocating Brayton
engines back in commercial operation, particularly for sub-mW
electric power generators. Turbines have blade leakage and windage
losses that become significant at smaller sizes. Another very important consideration is that turbine
engines are expensive to build while reciprocating engine construction is universal and inexpensive. Maintaining reciprocating engines in remote areas only requires skills that are generally available from local mechanics while maintaining turbines requires specialized skill. Finally, although it may be much larger than a turbine counterpart, a reciprocating Brayton
electric generator can have the compressor, expander, and synchronous generator all on a single shaft and can thus avoid the expense, noise, and maintenance of a high speed gearbox.
Turbines will remain the preferred configuration for the majority of Brayton
engines, but reciprocating Brayton
engines have a place that is now becoming more appreciated.
Why is it called ansi 150 ansi 300 etc?
The number (e.g. 150) is the lb force the flange is rated to.
Why centrifugal pump is not called a positive displacement type of pump?
A positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing (displacing) that trapped volume into the discharge pipe. Centrifugal pumps impart pressure to the fluid, to cause a pressure differential and cause flow, but even if the outlet is sealed, the pump can continue to run because it hasn't trapped the fluid. When no flow is occurring, a centrifugal pump acts like a propeller spinning in the water. If flow is stopped on a line that a positive displacement pump is supplying flow to, the pump is forced to stop since the trapped fluid prevents it from moving any more fluid.
What are the phases of eutectoid steel?
Preeutectoid steel which appears in a temp. more than 723c and Proeutectoid steel which appears ina temp less than 723c
preeutectoid steel contains ferrite and austentie
proeutectoid steel contains ferrite and cementite
How do you tell between aluminum and steel frame stoeger luger 22 caliber?
Someone has already mentioned using a magnet to determine whether it's steel or aluminum, but another way is the weight. I own one of the steel variety (shot it just this afternoon!), and it is a chunk!! You can definitely tell the difference.
In Short. Yes.
Broadly speaking, any ferrous material (containing iron-Fe) will oxidise to create an iron oxide layer (rust)
In the construction industry this is normally protected against by utilising paint systems and in marine applications by utilising cathodic protection.
Alloys such as stainless steel (which does contain Iron) can reduce corrosion to very low levels. In the case of stainless steel, the alloying metals (such as chromium) react with oxygen and water to produced a thin protective oxide film which may be only a few atoms thick and will give the material a seemingly non corroded appearance.
in otto cycle the burning of fuel is instantaneously therefore a very small voulme is required for burning of fule
How do you calculate swl of crane?
Cranes typically are designed with a FoS (Factor of Safety) of 5x the MBL (Minimum Breaking Load). So if the weakest part of the structure failed (e.g. in tension, compression or shear) at e.g. 100kN (10 metric tons), then the swl would be 10t / 5 = 2 tons
What is relation between PSI and bar?
PSI and Bar are units of pressure. PSI is pounds per square inch. The conversion rate between the two is one bar is equal to 14.5038 PSI. Bar is a non-SI measurement of pressure.
What is the relationship between pump impeller diameter and pump horsepower?
The brake horsepower varies as a cube of the impeller diameter.
What is the meaning of f6 in gate valves?
F6 Trim means that STEM, BODY seating surface, GATE seating surface, bushing (or a deposited weld), for the backseat and stem hole guide, small internal parts that normally contact the service fluid, excluding the pin that is used to make a stem-to-gate connection (this pin shall be made of an austenitic stainless steel material) are made of a 13Cr material (typical specification type ASTM A276T410 or T420). See API STD 600 - 2009.
How do you calculate friction power by willians line method?
In this method, gross fuel consumption vs. bp at a constant speed is plotted and the graph is extrapolated back to zero fuel consumption.The point where this graph cuts the bp axis in an indication of the friction power of the engine at that speed. This negative work represents the combined loss due
to mechanical friction, pumping and blowby.
What uses a compound gear train?
Any power plant that uses more than a single steam turbine as a prime mover. It could be a power plant, or a ship for instance. They use a compound gear train to get everything going the same way at the same time and at the same speed.
What is the difference between booster pump and transfer pump?
The centrifugal pump is use to transfer a larger flow rate of liquid in a low pressure stage, while the booster pump is use to transmit less volume of liquid in a high pressure stage.
Yes. It is considered "Mild" Steel due to the low amount of carbon in the steel.
What is the correct method of putting out a reciprocating induction fire?
i have a feeling your doing worksheet number 1 ground operations at the aviation institute of maintenance lol
Nominal moment is the entire calculated moment after applying load...
Cast Iron is commonly used for cooking, pans and saucers etc.
It is also used for BBQs.
It also used to be used for the construction of bridges.
Designers also use it to create furniture, particularly outdoor patio pieces.
It is also used in pipe plumbing.
Source: eHow.com
