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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
Yes. Some beliefs are that pure iron doesn't rust. This is not the case. Iron 'rsuts' or corrodes according to the following: Fe --> Fe2+ + 2e-
Cost of 1 kg of stainless steel?
Cost is dependant on the grade and form and where it is produced - labour costs.
What is the yield strength of Q345B steel?
the yield strength of Q345B is 345MPa for thicknesses <= 16 mm.
325MPa for 16 mm < thickness <= 35 mm.
295MPa for 35 mm < thickness <= 50 mm.
275MPa for 50 mm < thickness <= 100 mm.
How do you calculate 45 degree steel elbow weight-- need a formula?
The easiest way is to find the centerline length and multiply that by the linear weight of the pipe size being used.
Alternatively, this formula should give the weight of an elbow in pounds:
w=0.071*pi^2*R*(ro^2-ri^2)
Where:
w= weight of elbow (lb)
R=curve radius of elbow (in)
ro=outside radius of pipe (in)
ri=inside radius of pipe (in)
Define specific volume of wet steam?
If the pressure of a wet vapour is ≤ 2000 kPa and the dryness fraction is ≥ 0.9, then (if you wish) you may use: Vx=XVg ; where Vx is the specific volume you are solving for, X is dryness fraction and Vg is the specific volume of the saturated vapour at the given state (pressure, temp, etc).
Otherwise use: Vx = (1 - X)Vf + XVg ; and in this case Vf being the specific volume of the saturated liquid at the given state.
The specific volume of wet steam is quite simply, the volume per given mass of the vapour at the given dryness fraction (or steam quality). In the case of wet steam it is solved for by a function of the relationship between the percentage saturated liquid, and the percentage saturated vapour in terms of specific volumes for the two obtained from a data chart.
What is different between sawing and broaching?
Rotary Broaching is a method of producing both internal and external forms fast and accurately on the end of a workpiece. Rotary broaching makes it possible to very accurate forms within 0.0005 inches within seconds.
With rotary broaching not only can you produce standard shapes such as hexagons and squares but also shapes such as Double Hex Rotary Broaches, 6-Lobe Rotary Broaches, Serration Rotary Broaches, J500 Rotary Broaches, Spline Rotary Broaches, Involute Rotary Broaches, Torx Rotary Broaches, Double D Rotary Broaches and any other Special Design Required. Rotary broaches can be made to just about any size, English or Metric.
Some of the material that can be rotary broached is brass, aluminum and steel and can go as much as 2 inches deep.
What is the formula for spring stiffness?
The constant spring stiffness formula is the force applied to the spring equal to the stiffness times the distance it moved.
F=kx.
Depending on where your axis are, it could be negative.
My preference would be the weldment level. After the item is welded together, there is almost always some secondary operations like straightening or machining that must be performed, and in general the final part is the real concern for tolerances in relation to mating parts, etc.
The contraction of LNG pipeline which carries a condensed gas ,which caused by low temperature during operation, may impact the structure of pipeline, It is necessary to use compensation structure in the LNG pipeline to deal with the contraction of pipeline. This paper use bent pipe to compensate the amount of contraction of subsea LNG cryogenic pipeline. At the bends, the gas expands and thus maintain a constant volume while being carried from onshore to the processing plant.
Source: cedb.asce
Cad stands for:
Computer
Aided
Design
Cam is used to manufacture products. The term CAD/CAM implies both for designing a product and for controlling
Design manufacturing processes.
Cam stand for:
Computer
Aided
Manufacturing
Why are primary chilled water pumps smaller than secondary pumps?
PRIMARY CHILLED WATER PUMPS ARE SELECTED TO FULFILL THE REQUIREMENTS OF THE CHILLER WHERE AS SECONADRY CHILLED WATER PUMPS TO SUPPLY CHILLED WATER TO THE LOAD. FOR EXAMPLE TO THE FAN COIL UNITS & AIR HANDELING UNITS. IN NORMAL PRACTICE THE SECONDARY CHILLED WATER PUMPS ARE APPLIED WITH VARIABLE FREQUENCY (SPEED) DRIVE WHILE PRIMARY WITH CONSTANT SPEED, IN THIS ALSO PRIMARY CHILLED WATER PUMPS CAN BE USED WITH VFD SYSTEM. AIJAZ AHMED JALBANI MECHANICAL ESTIMATION ENGINEER EMIRATES TECHNICAL & THERMAL SYSTEMS L.L.C
How does a thermal power plant work?
Thermal power plant uses heat source like burning coil, gas, wood or natural heat sources like solar heat or geysirs. Heat is transformed to vaporising water. When water turns into steam it has lot of energy(entalphy) in it. this energy is used in wanted application as turbine or central heating. Most of the energy is where the steam turns back to water. Thermal power plant usually has both electric turbine and distributional heating because of better use of energy. Electric power production pays more and some applications are made only for electric production.
Is it the stress that produces strain or strain produces stress?
A Force applied to an object will cause a displacement. Strain is effectively a measure of this displacement (change in length divided by original length). Stress is the Force applied divided by the area it is applied to. (eg. pounds per square inch) So, to answer the question, it is the applied Force that produces both stress and strain. Stress and strain are linked together by various material properties such as Poisson's ratio and Young's Modulus.
What is the half split technique?
half split technique is a fault finding method in which faulty area is compared with one of the similar What_is_the_half-split_fault_finding_techniquearea. in hydraulic rig, say if cylinder B is not working, we compare it against another working cylinder, say cylinder A. By comparing we collect data and determine the difference between both working and non working components.
i.e. what is the status of incoming and out going flow in both (working and non working) components?
are both pressurized only when it should?
etc.
AA
The Schmid factor m is part of the equation for the critical resolved shear stress τ0.
The critical resolved shear stress is the component of shear stress in a slip plane, resolved in the direction of slip, necessary to initiate slip in a grain (plastic deformation in metals).
m = cos(κ)cos(λ) ; τ0 = mσ
κ - the angle between the applied load direction and the slip plane normal.
λ - the angle between the applied load direction and the slip direction.
σ - the applied stress or load
How fast can plasma rockets go?
Since no one has actually flown one yet, we can only use scientific estimates. Which, depending on the payload and the size of the plasma engine you're using, tops out at close to 1,000,000 miles per hour.
What is the weight of a cubic inch of stainless steel?
Steel is an alloy - a mixture of various metals - and so its density depends on the proportion of the constituents in the alloy. The weight (not mass) varies between 9.0 and 9.3 pounds weight per cubic inch.
What is high side and low side in air conditioning?
High side and low side refer to the pressures in the two halves of the system. AC works by compressing refrigerant in the compressor ( the beginning of the 'high side'), cooling in the condensor it, and then expanding it to absorb heat ( where it enters the low side). Then the low-side piping takes is back to the compressor, where the cycle starts over.
