Mechanical Engineering

Meaning: To push to the limit, go all out, full speed. Origin: Early railroad locomotives were powered by steam engines. Those engines typically had a mechanical governor. These governors consisted of two weighted steel balls mounted at the ends of two arms, jointed and attached to the end of a vertical shaft that was connected to the interior of the engine. The entire assembly is encased in a housing. The shafts and the weighted balls rotate at a rate driven by the engine speed. As engine speed increases, the assembly rotates at a faster speed and centrifugal force causes the weighted balls to hinge upward on the arms. At maximum engine speed - controlled by these governors - centrifugal force causes the two weighted balls to rotate with their connecting shafts parallel to the ground and thereby nearly touching the sides - the walls - of their metal housing. So, an engineer driving his steam locomotive at full throttle was going "balls to the wall". The expression came to be used commonly to describe something going full speed. The saying became more popularized with fighter pilots. The "balls" are knobs atop the plane's throttle control. Pushing the throttle all the way forward, to the wall of the cockpit, is to apply full throttle. The honest truth is, locomotives came before airplanes. "Balls to wall" was shouted by the locomotives engineer to tell the fireman to "give it all she's got".

Lp turbine diaphragm breaks due to positive pressure inside the condenser because of steam expansion.

i have a feeling your doing worksheet number 1 ground operations at the aviation institute of maintenance lol

In Vickers hardness test the for used is much lighter than the force used in Rockwell hardness test, The Rockwell hardness test is the considered to be the most routinely used technique to measure the hardness of materials because of its simplicity and because it does not require specific skills in order to perform it.

Yes. It is considered "Mild" Steel due to the low amount of carbon in the steel.

It's 1ft/lb tension! I like cupcakes

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 the hemp plastic, it is up to ten times stronger

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

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.

It is pretty low, close to zero.

in a separately excited generator the field coils are excited from a separate source like a dc battery may be or any other small generator. They are self starting generators.

The Drop Weight Tear Test (DWTT) is a test used to determine the fracture properties of steel at certain temperatures, and also to determine the temperature at which a steel transitions from ductile to brittle fractures. The test is performed by dropping a weighted hammer on to a full-thickness standard sized (usually 12" by 3") and notched sample, causing the sample to fracture ("tear") completely through the middle. The fractured surface is then observed and measured to determine what percentage of the "torn" area is ductile fracture. Ductile fractures are desired because they mitigate how fast and far fractures travel through the steel. The temperature at which this test is performed is important because steel becomes more likely to experience brittle fracture (which is not desired) at lower temperatures.

The advantage of this test is that it can be used on full-thickness specimens, providing a more accurate demonstration of how the steel would fracture in a real application. This test is required by API standards for certain sizes and grades of steel line pipe for oil, gas, and petroleum products, to demonstrate that the pipe can experience ductile fracture at reasonably low temperatures.

Sources:

Seeing and running DWTT's first hand

ASTM E436

API 5L

API 5L3

"Don't drop the drop-weight tear test" by Dr. Andrew Cosham et al.

in 2kg we get proper venting of unsoluble gases as well as air and ultimate answer is it is easy to operate at 2kg.if we operate at much pressure it is difficult and steam venting is more

It is the direction in line with (parallel to) the axis of the part. If you have a cylindrical shaft, for example, the axial direction runs along the length thru the center of the circular ends.

this region is called the linear elastic region as such it is the linear elastic stress.

Multiply the number of square inches times the pounds per square inch. In this case, 5 x 50- or 250 pounds of force.

there are two stroke include in this forward stroke &return stroke

during the forward stroke machine works means it removes the material from workpiece & during the return stroke machine remains idle

you need to find out the necessary force and supports for the design before building it.

Woods Metal. It melts in boiling water or at 158 degrees. It will quickly harden at room temperature.

feed mm/sec

speed Rev/min RPM for cutting tool

naw a canny fs

It is fitted on discharge line after condenser, where the gas enters in liquid forms.