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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
It depends on how the fan blades are angled. If there angled right at 45 degrees then it should spin clockwise but if angled left 45 degrees anticlockwise. Please improve this answer since i am 11.
Does anti spyware remove Trojan horses?
It depends on the program, some do some don't, if you look go to the manufactures website usually they will tell you. However often times, there antispyware, is lesser than that of a specialized antispyware.
How many threads should a bolt engage?
As a general rule, a bolt should engage a distancegreater than or equal to its outer diameter. The number of threads engaged can then be calculated from the number of threads per inch on the bolt. So if you are using a 1/4-20 bolt, meaning it has 1/4" diameter and 20 threads per inch, you should engage the bolt 1/4" into the hole, or 5 threads. (20 threads/inch x 1/4 inches)
Why: The shear stress on the threads will be equal to the tensile stress in the shank of the bolt. This means that once you thread the bolt in a distance greater than its diameter, the shank itself will fail before the threads shear off the bolt under tensile load.
Sources: Design of Machinery class at Purdue University, page 10 of the following MIT article: http://web.mit.edu/2.75/resources/FUNdaMENTALs%20Book%20pdf/FUNdaMENTALs%20Topic%206.PDF
Why you keep condenser rupture disc in steam turbine?
You want the rupture disk located at the LP exhust side of the steam turbine. This is placed here to prevent over pressure of the condencer in case loss of vacuum occurs. It is not placed in the condencer because the condencer is not rated for pressure.
The micron is 1 x 10-6 meters, so 5 microns is 5 x 10-6 meters. This is also 0.005 millimeters, or 0.000197 inches.
How do you calculate static head pressure?
STANDARD 1kg\10m
the other system is to to insert a throttle valve at the flow lime of the pump and pressure gauge helps us knowing the STATIC head pressure.
How does a cnc milling machine work?
A CNC laser machine utilizes a Computer to Numerically Control it. Common CNC language is called G-code (though roughly standardized, there are many forms). The CNC laser machine is different from the Windows driver or plotter style CNC machine that can laser engrave or laser cut directly from a third party design package like Corel Draw, AutoCAD, or Adobe Illustrator.
The G code of the CNC provides advanced control and more capability, and with this capability comes increased complexity and the need for more training. But the trade-off is worthwhile in a production environment where accuracy, quality and efficiency are paramount.
First, a drawing is made in a third party package such as AutoCAD or Solidworks, and exported in 2D format (dwg, dxf). A CAM packaged (Computer Aided Manufacturing) is utilized to enable the user to perform several functions that improve the accuracy, efficiency and quality of the laser cutting. For example, the user can decide to add a lead-in and tail-out for circle cutting or hole cutting. The laser pierces a hole in metal and the pierce creates a larger diameter hole that the cut line. So, rather than having circles with a notch where the laser pierced, the user pierces inside the hole (where the scrap is) and then cuts a lead in line to the circle then after finishing the circle cut leads out into the scrap area again. Other functions include setting the tool width and then compensating for the width of the laser cut line. This makes for higher accuracy in cut parts. Additional functions include setting cut order to minimize head up moves. In some cases, the user can specify gas or air assist pressures in the laser setup section at the top of the g-code.
After the setup in the CAM package, the G-code is generated. The G-code contains the motion commands and the laser commands to run the job. See http://www.2laser.com/bristol_series_-_metal_cutters for CNC laser machines.
What is the working principle of steam turbine?
The Steam Turbine is the one which steam worked pressured Hot and exited then the shaft of the turbine starts to and fro motion due which energy is injected through nozzle in the receiver.
What is allowable bending stress of stainless steel?
Each steel alloy has it's own stress curve and tolerances. The design of something made of steel and the calculation of the stresses involved has to take into account certain safety factors depending on what is being made (a bridge for transporting goods and people has a different safety factor than a frame for a table!)
Explain the difference single shear and double shear?
Single shear carries all load on one face whule double shear carries it on two faces, so stress is lowere by a factor of 2 for a given load.
For example shear stress on a cantilever pin is V/A ( load/area, single shear) but on a pin between two supports it is V/2A
What is the disadvantages of centrifugal compressor?
A centrifugal pump cannot pump air, therefore cannot self prime, like a positive displacement pump.
Where can one buy a cast iron tub?
A cast iron tub can be bought from several places. A person could go to a big box store such as Home Depot or Lowes. Also a person could check with a local metal worker who specializes in household items.
What does IPE in structural steel stand for?
IPE is an acronym relating to medium size flange I-Beams manufactured according to the Euronorm 19-57 standard
What is the difference between a Gas turbine engine and a piston engine?
a compressor does work on the gas , raising its pressure and temperature
a turbine does the reverse , it expands the gas as it passes through the turbine, extracting energy from the gas to do mechanical work.
For a typical jet engine , the flow track on a compressor is of a converging cross section while is it diverging for the turbine, which is as per gas dynamic laws.
The Turbine does two things here in the jet engine, one ,it runs the compressor and two, expands the gas to the propelling nozzle which produces thrust by accelerating the gas upto its exit.
P-11 is a piping material usually used in refinery and petrochemicals industries for services at or around 550 to 600 degree C temp. It is low alloy steel. It contains 1.25 cr and 0.5moly.It resitant to hydrogen attack. It need PWHT(post weld heat treatment).
PWHT to be in the range of 680 to 780 degree C.
P-22 is a piping material usually used in refinery and petrochemicals industries for services at or around 550 to 625 degree C temp. It is low alloy steel. It contains 2.25 cr and 1.moly.It resitant to hydrogen attack. It need PWHT(post weld heat treatment).
PWHT to be in the range of 680 to 780 degree C.
What is the Coefficient of thermal expansion for brass?
assuming it is pure copper and not an alloy, 17(k), 9.3 Co
Before any work is done on the machine you must ensure that the correct risk assessments are in place and have been fully read so you're aware of the dangers that the machine possess.
When working with machinery you should always ensure that you're competent to use it, do not use equipment that you're not trained to use. When using machinery always be aware of where you're emergency stop buttons are and where there are any areas in which you could be caught, entangled or trapped in moving parts. Always ensure that you remove any lose clothing or jewellery and tie back long hair. Ensure that all machine guards are put in place before using the machine.
When using an automated welder, you should always ensure that you wear the correct P.P.E at all times. Always wear a long sleeve welding jacket to cover any bare skin to stop UV burns. Use a welding helmet or face shield when the arc is in process to protect your face from UV burns and your eyes from "arc eye". Wear safety glasses at all times to ensure that your eyes are protected from any particles or debris that my fly into your eyes. Before, during and after welding ensure that there are adequate welding screens around the equipment to protect others in the vicinity from the welding arc. Also if necessary use the correct fume extraction equipment to remove any unwanted fumes, this will not only protect your but others in the vicinity.
On completion of any welding activity the machine must be shut down in the correct manner, to avoid any malfunctions and damage to the software. You should dispose of any waste, i.e. filler wire, materials, in the correct manner that applies with the COSHH regulations.
What does TP stand for in TP316 ASTM A240?
Standard Specification for Heat-Resisting Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels
What is open loop and close loop system?
Q: What is the difference between 'Open Loop' and 'Closed Loop'? A: When the engine is first started, and rpm is above 400 rpm, the system goes into 'Open Loop' operation. In 'Open Loop', the ECM will ignore the signal from the Oxygen (O2) sensor and calculate the air/fuel ratio based on inputs from the coolant and MAF sensors, but mostly from a pre-programmed table in the memcal. The system will stay in 'Open Loop' until the following conditions are met: 1. The O2 sensor has varying voltage output, showing that it is hot enough to operate properly. (This depends on temperature)
2. The coolant sensor is above a specified temperature about 40oC/104oF.
3. A specific amount of time has elapsed after starting the engine. The specific values for the above conditions vary with different engines and are stored in the mem-cal. When these conditions are met, the system goes into 'Closed Loop' operation. In 'Closed Loop', the ECM will calculate the air/fuel ratio (injector on-time) based on the various sensors but mainly the O2 sensor. This allows the air/fuel ratio to stay very close to 14.7:1.
What is the International color code for DC wiring?
"What is the International color code for DC wiring?" "What is the International color code for DC wiring?" "What is the International color code for DC wiring?" "What is the International color code for DC wiring?"
What hammer is most used by mechanics?
A a field mechanic dealing with diesel engines the hammer I use most often is a three pound/ 1.5 kilo drillers hammer. It has a very short handle which allows me to swing it in tight spaces The second a ball pien hammer.
What is the difference between shock load and gradually applied loads and suddenly applied Load?
The only difference between a shock load and a gradually applied load is something called an impulse; defined as the integral of a force with respect to time. When a force is applied to a rigid body it changes the momentum of that body. A small force applied for a long time can produce the same momentum change as a large force applied briefly, because it is the product of the force and the time for which it is applied that is important.
