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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
How strong is stainless steel?
It is relatively strong. The measured ultimate tensile strength of stainless steel is 860 MPa. Tensile strength measures how much force is required to break it when stressed by being stretched or pulled.
For relative comparisons the following ultimate tensile strengths are given:
Stainless Steel ~ 860
Structural Steel ~ 400
Aluminum ~ 483
Silk ~ 1000
Pine wood ~ 40
Human bone ~ 130
Diamond ~ 2800
Concrete ~ 3
Hair ~ 380
Copper ~ 220
Titanium ~ 1040
What are the four forces on an aircraft and how do they act on an aircraft?
For an airplane to fly, it must always engage in a tug of war between the opposing forces of lift versus weight and thrust versus drag. For a moment, think of an airplane moving from right to left and the flow of air moving from left to right. The weight or force due to gravity pulls down on the plane opposing the lift created by air flowing over the wing. Thrust is generated by the propellor and opposes drag caused by air resistance to the airplane. During take off, thrust must be greater than drag and lift must be greater than weight so that the airplane can become airborne. For landing thrust must be less than drag, and lift must be less than weight. Hope this helps
What are some uses of a scotch yoke mechanism?
This setup is most commonly used in control valve http://www.answers.com/topic/actuator in high pressure http://www.answers.com/topic/pipeline-transport.
Difference between jig and fixture with example?
Both hold the workpiece. But a jig guides the cutting tool whereas a fixture does not.
1. Size
Jigs are normally very light in size and they are not fixed onto the machine table. This is because it has to move around guiding the cutting tool unlike the fixture that is clamped onto the table. Furthermore, the fixture is quite bulky in construction and it helps hold the work in position. The other reason why the fixture is fasted onto the table is to ensure that the work piece does not move when the machine starts operating.
2. Application
Fixtures boast of a wider application range as compared to jigs. In fact, fixtures are made for applications wherein the cutting machines cannot be easily guide like a drill. When using these work holders, a center finder, gauge blocks or edge finder positions the cutter. Some of the examples of common fixtures include lathe fixtures, milling fixtures, grinding fixtures and sawing fixtures. Furthermore, fixtures can be utilized in any machine operation that demands an exact relationship between a tools' position to a work piece.
3. Accuracy
Another key distinction between a jig and a fixture lies in accuracy. Here, a jig is more accurate than a fixture. In fact, jigs are typically used so as to ascertain the high precision of parts during production. This action helps control the quality control costs.
To sum up, jigs and fixtures help to save labor and even less skilled workforce can effectively work complex machines through their assistance.
Air vane motor advantages:
- low weight and small size (only 1/5 of the weight and 1/2 of the size of an electric motor of equivalent power)
- safe or use in potentially explosive requirements (air motors fulfill ATEX requirements)
- overload safe - an airmotor can be load to standstill without damage
- sterilisable for repeated use in clean-rooms
- sealed - even for underwater usage
- insensitive to cleaning agents
- suitable for the high standards of the food processing and pharmaceutical industry
- insensitive to acids
- torque increase with higher load
- insensitive to vibrations
- insensitive to heat
- insensitive to dust
- reversible - can be set in both rotational directions
- speed is easy to controll: adjustment of the speed by altering the pressure or air quantity (throttling via valve)
- low installation costs
- maintenance friendly
What is an air vane motor?
Alle vane motors essentially consist of a rotor, which circulates in an exxentrically offset perforation of a rotor cyclinder. Because of this eccentrically offset perforation, the vanes form working-chambers. The expanding of the compressed supply air (the pressure energy) is converted into kinetic energy - this results in a rotation of the rotor.
A typically vanes motor speeds up to approx. 60,000 rpm. In combination with a gear box the speed can be regulated down to 5 rpm.
Air vane motors are safe and robust drive systems, which come into play when a high performance and overload safe drive is required. Always ready for action long after traditional drive technology has stopped spinning!
Is Diploma course from rvd is valid or not?
Yes it's valid. You can check the list of approved universities in UGC's website or NAAC website. The full name of RVD university is 'Janardan Rai Nagar Rajasthan Vidyapeeth (Deemed) University', so you should be looking for this name. Also it has a B++ rating You can check the below link also. http://www.educationobserver.com/resources/universsities/rajasthan.htm Regards Sunil
How does pneumatic bicycle pump work?
You'll have to start with determining which kind of valve you've got. For the US there are basically two options:
- Schraeder valve, the same as on a car
- Presta valve, which is narrower.
Then find a pump with the appropriate nozzle. For Schraeder, just remove the cap and go at it. Particulary if you're filling from a compressor, don't exceed the max allowable pressure stated on the tire sidewall.
For Presta, remove the cap, undo the locknut, give the valve a push to break the seal. Then apply the nozzle and inflate the tube.
For Europeans there's the added option of the Dunlop valve, which can be inflated with the same type nozzle as the Presta, but there's no locknut that needs to be opened.
What is the Rockwell Hardness value for an annealed plain carbon steels?
S7 tool steel is produced and supplied to the machinist or tool maker in the annealed or soft condition. S-7 is typically heat treated and used in the Rockwell C hardness range of RC 54-59. Form more specific information about S-7 tool steel and heat treating, see the related links below.
What is molar mass of 304 grade stainless steel?
The molar mass of 304 grade stainless steel is not a single value, as it is an alloy primarily composed of iron, chromium (about 18%), and nickel (about 8%), along with small amounts of other elements. To estimate the molar mass, one can calculate a weighted average based on the proportions of these elements. This typically results in an approximate molar mass of around 200 g/mol. However, the exact value can vary depending on the specific composition of the alloy.
Machining usually refers to performing a mechanical process on a workpiece of any material that changes its physical properties in some way. More commonly it means to use machine tools to shape a workpiece with cutting action.
What is the Cost of pneumatic control valve product?
Pneumatic process control valves are used in process industries to control the flow of fluid by using pneumatic actuators.
It requires 4.5 to 6 Kg/sq. cm of pressure to operate the valve.
Control room sends electrical signals of 4-20 ma to field where I/P converter converts these electrical signals into pneumatic signals.
Actuators use these signals to operate the valve.
Actuators moves the stem up and down depending upon input signals and control the valve opening.
4ma- 0% opening
8ma- 25% opening
12ma- 50% opening
16ma- 75% opening
20ma- 100% opening
What is the young modulus of nylon?
It really depends on the type of Nylon; if you need a number it is around 500,000 psi (3.4 GPa)
What is a wind turbine used for?
Wind is a form of solar energy. Winds are caused by the uneven heating of the atmosphere by the sun. The wind turbines spin round and produce electricity. This is a good way of producing electricity as the wind will never go.
What is the Bending moment of a simply supported beam with point load at the middle?
assuming the point load acts in the centre, take the value under it as P*L / 4
where P=point load (kN)
L=length between supports
if its not in the middle, take it as P*a*b / 8
a=dist from left hand support to load
b=dist from right hand support to load
thanks,
Abdul wahab
The " in not in the middle formula" is incorrect.
Your Welcome
Paul
Difference between pneumatic and hydraulic machine?
Pneumatic system is operated by compressed air while hydraulic system is operated with pressurised hydraulic oil
or any type viscous oil.
Hydraulic systems can usually produce higher control forces and work under extreme
operating conditions. This is the system that is primarily used on aircraft to move
control surfaces and engine controls.
You can often classify pneumatic systems because they have a pump (gas pump) and
hydraulic systems have a piston.
That is the difference. Also, pneumatic systems are louder because it is a gas under pressure.
1. By definition, hydraulics is used in controlling or harnessing power
with the use of pressurized fluids whereas pneumatics studies how pressurized
gases influences mechanical motion or movement.
2. Hydraulics uses an incompressible fluid medium like oil whereas pneumatics
uses a compressible gas like air.
3. Hydraulic applications demand greater pressures during operations that reach
thousands of pounds per square inch whereas pneumatic applications only
require 100 psi pressures more or less.
4. Most hydraulic applications generally use bigger components that pneumatic applications.
5. Hydraulic systems are generally more difficult to operate compared to pneumatic applications
Advantage and disadvantage of arc welding?
Arc welding has many preferable qualities in welding such as: Faster weld speeds (obvious economics). Less distortion from thermal expansion/contraction. Addition of alloying elements in the electrode flux or coating. Higher weld qualities since scavenging agents can be added that will combine a "float out" impurities. The gas shield from the flux or additional externally added inert gas shields the molten weld pool from harmful atmospheric gases such as oxygen (oxidising) and hydrogen (embrittlement). A better selection of weldable materials (extremely difficult to "torch" weld aluminum due to oxide formation and high thermal conductivity is one example magnesium will start to burn and is hard to put out would be another example).
A localized compressive stress at the area of contact between two components which r not having relative motion between them, is known as crushing stress.
How do you calculate fuel consumption per hour of 250 kva diesel generator?
To know how much fuel a 250KVA diesel generator uses per hour, referring to the operator's manual is all that is needed. It states that properly maintained diesel generators of this size average a fuel consumption of 21 gallons per hour.
What is throttle pressure regulator of a steam turbine?
Essentially its the pressure prior to entering the turbine chamber via the MSV (main stop valve)
This is a loop function ... the loop will continue until something true happens. example: int i = 0; do { console.write(i + "< br />"); i++; }while(i < 100); This will loop 100 times.
What are the disadvantages of a first-class lever?
disadvantage of first class the fulcrum lies on more effort or more force.
You want topics of recent trends in electronics for doing paper presentation at engineering level?
can u tell some recent topics in giving the prfesentation in the college related to computer techniques that is recently work..
so that i wl get gud response by college and will help in my placment..
How pass line is calculated in hot rolling mill?
Rolling schedule is the time sequence of passes of rolled piece through the mill respecting many constrains and limitations such as:
- * Limit separating force
- * Limit rolling torque
- * Bite angle
- * Flatness limits
- * Metallurgical limits
- * Specific limits(length of delay table, etc.)
If all constrains are fulfilled and rolling schedule gives maximum productivity (minimum production time) and the desired product and its specifications are obtained, we can speak about optimum rolling schedule.
What is the percentage of carbon in dead mild steel?
Carbon content in dead mild steel is betweet 0.05% & 0.15% .
