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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
Is there a special grinding wheel for stainless steel?
Yes, any grinding wheel are flapping disc are sanding disc. But the trick is. Making sure you only use whatever your uising on stainless. When you grind the metal gets inbedded in the disc. When you grind on a none stainless piece than back to stainless. You have contaminated your disc rustable metal. your stainless still can become stained with small colorization of rust
Which is faster chaingun or minigun?
A "minigun" is an externally powered multi-rotating barreled gun that shoots the 7.62x51mm NATO round (".30cal") anywhere from 2000-6000 rounds per minute depending on the specific variant and gearing. Typical firing rate is about 4000 rounds per minute, or about 66 rounds per second. For reference, an AK47 fires about 10 rounds per second.
The typical 7.62x51mm NATO round has a muzzle energy of 3500 joules yielding a overall muzzle energy delivery rate of 231kW.
A "chaingun" is an externally powered single barreled gun that uses a chain drive to operate the reciprocating bolt with extreme ruggedness and reliability. The standard Mk242 chaingun shoots the 25x137mm cannon round at an average of 180 rounds per minute, or 3 shots per second.
A typical 25x137mm round has a muzzle energy of 105,000 to 120,000 joules depending on the type of projective (AP/Sabot/HEI) yielding an overall muzzle energy delivery rate of 360kW for the Mk 242 chaingun - not including the POI effect of HEI munitions.
Short answer: Minigun fires faster. Chaingun delivers more power in a shorter amount of time more reliably with more types of munitions. At the end of the day, a minigun is just a quick gun and the chaingnun is an autocannon. Chaingun for the win.
What are some factors that affect the efficiency of automobile engines?
The size and quality of a vehicle's tires affect fuel efficiency. Bad spark plugs will cause cars and trucks to use more gas.
What is force feed lubrication?
Force feed lubrication systems are designed to accurately deliver, monitor, and protect oil delivery to pumps, compressors, or any other critical equipment. A system is usually comprised of a divider block which automatically directs the oil to several points, a lubricator pump to deliver the oil under sometimes very high pressure, and a computer to monitor the flow of the oil, to give totals, averages, alarms, etc. For example a reciprocating compressor may need oil delivered directly to the piston area itself. This would require generating enough oil pressure to overcome what ever gas pressure may be at the piston area. Sometimes several hundred to a few thousand psi may need to be produced by the force feed lubricator.
A burn caused by heat; or a rather odd way of saying "burning" or "combustion", i.e. the chemical reaction that emits heat.
What is the difference between dry and wet corrosion?
dry corrosion is taken place in the presence of gases whereas wet corrosion takes place in the presence of moisture in air
What thickness of skillet to pneumatic test 16 inch diameter pipe at 600 psi?
ASME B31.3 Section 304.5.3 "Blanks"
t=d SQRT((3P)/(16SEW))+c
t=thickness of permanent blank (inches)
d=inside diameter of gasket (diameter seeing pressure) inches
E=quality factor (for safety of material used) Range 0.80-1.00
P=design gage pressure (psi)
S=stress value of material (psi)
W=weld joint strength reduction factor (cut out of plate to avoid this - otherwise assume)
Assuming 50ksi steel you would need a ~3/4" skillet
What is the difference air compressor and gas compressor?
1.The compressors used for compressing the other gases and air are independent entities. This means they merely compress the gas or air and supply it for the suitable applications. They have no direct connection with any other type of machine, though lots of machines and equipments depend on the compressed air or gas. The refrigeration and the air conditioning compressors are a part of the complete vapor compression cycle that comprises of additional components like the condenser, expansion valve and the evaporator. If the compressor is removed from this cycle, the refrigeration process will cease to exist.
Main function of the compressor: The main function of the other compressors is to merely compress the gas or air. The refrigerant compressor compresses the refrigerant to the pressure corresponding to the saturation pressure higher than the temperature of the naturally available air or water. This enables the cooling of the refrigerant in the condenser by the available atmospheric air or water.
Further, the refrigerant compressor also circulates the refrigerant through the whole cycle. The refrigerant after leaving the compressor is forced to the condenser, the expansion valve, and the evaporator and then it is sucked by the compressor for compression and recirculation though the whole cycle.
3) Capacity Determination: The capacity of the refrigerating compressor determines the capacity of the whole refrigerating or air conditioning plant. The capacity of the air or gas compressor doesn't determine the capacity of the other plants. For instance, though the pneumatic tool depends on the compressed air for its operation, it has its own capacity.
4) Relation to the other equipments: The refrigerating compressor is integral part of the cycle that includes other components of the cycle like condenser, expansion valve, and the evaporator. The working and proper functioning of each of these components depend on the working of other components. If the refrigeration compressor breaks down the whole system will collapse. There is no such dependency in case of the other compressors. If the air or gas compressor breaks down, the standby compressor can be started easily.
It means that the valve is rated for a pressure of 2500 psi.
Why is a sliding disk in a gate valve tapered?
A sliding disk in a gate valve is slightly tapered to reduce friction and potential binding from material build up over long periods of time. Essentially it makes the operation of the valve much easier and more reliable.
A small "pool" of molten metal that is manipulated to crate a weld bead.
What is the difference between shear center flexural center center of twist and elastic center?
The elastic center that point of a beam in the plane of the section lying midway between the flexural/shear center and the center of twist in that section.
The flexural center and the shear center are the same thing. It is that point through which the loads must act if there is to be no twisting, or torsion. The shear center is always located on the axis of symmetry; therefore, if a member has two axes of symmetry, the shear centre will be the intersection of the two axes. Channels have a shear center that is not located on the member.
The center of twist is the point about which the section rotates when subjected to torsion.
If the object is homogeneous and symmetrical in both directions of the cross-section then they are all equivalent and are located at the beam centroid.
Where is the alarm fuse for a 2000 Jetta?
There is not a fuse that you can pull. If you are asking because you only have a valet key and your alarm is active (goes off for ~30 seconds every time you start the car), try opening the trunk, or trunk then driver door then unlocking all doors, then start the car again. The trunk lock has a switch that disables the alarm when it is opened with the key.
What are the critical temperatures of iron -carbon equilibrium diagram?
At the time I'm writing this answer, I'm astudent of BSc Metallurgical & Materials Engineering and I've had a brief study of Iron-Carbon diagram recently. I hope my answer helps.
The Lower Critical Temperature is 1333o F.
The Upper Critical Temperature is 2066o F.
What is average cost to clean fuel injectors?
The average cost to clean fuel injectors is about $150. Fuel injectors are used to deliver fuel into an internal combustible engine.
How do you find the operating pressure of a hydraulic cylinder?
this is question related to the strength of materials rather than the hydraulics
the basic equation for the stresses in thick walled cylinders will give you the pressure at which the respective hydraulic cylinder can be operated.
for radial stress=((piri2 )/ (r02 -ri2)) * ((1 - (ro2/r2)))
where pi is the internal pressure of the cylinder
ri is the internal radius of the cylinder.
r0 is external radius of the cylinder.
r is the radius of the point you have selected on the cylinder (this is mostly ri because it is the point were high stress is felt .apparently this formula gives the value of radial stress at point selected by you that is the 'r' value)
for tangential stress=((piri2 )/ (r02 -ri2)) * ((1 + (ro2/r2)))
adding the 'tangential stress' and the 'radial stress' would give you the value of the 'axial stress' this along with some 'factor of safety' value can determine the operating pressure of the hydraulic cylinder or in this case the internal pressure of the cylinder.
What role does a compessor play in a refrigeration system?
In vapour compressor refrigeration system the low pressure and temperature vapour refrigerant from evaporator is compressed. where it is compressed to a high pressure and temperature. From compressor refrigerant goes to condenser where where it changes the phase. from condenser refrigerant goes to evaporator through expansion device.
Can ketchup be stored in stainless steel?
Most forms of stainless steel are subject to acid corrosion. As a tomato product, ketchup is acidic and probably should not be stored in stainless steel. Ketchup is usually stored in glass or plastic containers, which are usually less costly than stainless steel, so there is no reason to consider using stainless steel except in bulk manufacturing situations.
Why nickel is only use for weld the cast iron?
Nickel is used mainly because cast iron is brittle and very suseptable to rapid heat change. The nickel rods allow the weld to heat and contract without causing cracks. you can also help this process be heating the cast iron to cherry red and when welded allow it to cool wrapped in rock wool. this allows for a slow cooling helping to prevent cracking.
How can you melt a galvanized nail?
well galvanized metal is nothing more than zinc coated steel. Zinc melts at 787.1 F and steel melts at roughly 1200 F depending on the quality of the steel. So yes you can melt a galvanized nail.
What machine starts with the letter q?
a quern is a simple machine that is used to grind corn. it has a lever which is used to grind corn.
