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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
What is the historical development of engineering and what drove engineering?
Industrial engineering has developed in the past 250 years. Five different phases of industrial engineering have almost passed. These phases are:
Phase 1: Pre-Industrial Revolution Era (up to early 1800s)
Phase 2: Industrial Revolution (early 1800s to late 1800s)
Phase 3: Scientific Management Phase (1890 to 1940)
Phase 4: Operations Research and Quantitative Phase (late 1940s to early 1980s)
Phase 5: Automation and Computer Integrated Manufacturing Phase (since early 1980s)
The future trend is towards more automation, computer controlled manufacturing, information handling through computers, and integration of manufacturing systems.
explain the procedures used in task3 when fault finding in electro-pneumatic and electo-hidraulic system
No.
This question probably stems from a misunderstanding of a term. Likely came from the fact that the undercarriage of an aircraft is often referred to, at least in the U.S. as Landing Gear.
Answer 2Aircraft landing gears can have gears similar to a car's rack and pinion steering mechanism that turns the lower piston of the Nose landing gear. The rack and pinion would be operated with hydraulic pressure. Reference Airbus airliners.The first answer seems to refer to the retract mechanism. Most gears are retracted and extended using some hydraulic power and the kinematic design of the strut and its links and pivot points.
The Concord had a mechanism that pulled up the Main landing gear to make it shorter just before it rotated into the wheel well during Retraction. Otherwise, the gear was too long to go inside the wheel well. I'm not sure exactly how this worked but I think it was with the use of a mechanical linkage that may have used a bell crank or a gear.
I don't know of any Landing Gear that uses a ball-screw actuator to retract and extend it, which is commonly used for flight controls.
How do you decide when to use pneumatic or hydraulic power?
when high power transmission is involved then hydraulics is the best option this because there are hydraulic fluid available to suit the various pressure levels. liquids have almost zero compressibility.
in pneumatic system air is the working fluid, too high pressure could compress the air to such an extent to liquify it causing the tubes to crystallize and burst it. air is highly compressible and hence power loss should also be accounted for the compressed air so only low power systems possible here eg: pneumatic door openers .
What happens to a spring when a load is applied to it?
You compress it
Well, it ALL depends on how hard you push down on the spring.
What are the degree in mechanical engineering?
You can obtain aBachelor's Degree (BSME), Masters Degree (MSME or MSE-ME), and Doctor of Philosophy (PhD) in Mechanical Engineering.
Jigs and fixtures in manufacturing industry?
1. Alignment of a part or workpiece.
2. Securing the part or workpiece.
3. Duplication of a process.
4. Maintain or improve part quality.
5. Increase productivity.
6. Reduce cost of production.
7. Improve overall safety to the part, the operator, and the machine.
What is air fuel ratio of gas turbine engine?
Depends on the fuel. Type of engine is not important.
For gasoline, a 16:1 ratio would be ideal, for alcohol (Ethanol) 8:1 is considered ideal.
A good estimate for any fuel is to split the difference between Lower Explosive Limit (won't burn; too lean) and Upper Explosive Limit (won't burn, too rich). For example, Propane has a LEL of 24,000 ppm, and HEL of 96,000 ppm, so split the difference and 60,000 ppm should burn pretty well.
60,000 ppm should be about 6% or 17:1.
What does retention time mean?
The retention time represents the time it takes to an analyte to pass from the column inlet to the detector.
Example of products made by using lathe machine?
We use the lathe machine for facing, knurling, grooving, etc...
n gen we use all these processes after foundry and casting of a object...
We can use lathe for threading, cutters etc.....
What the function of motor operated valve actuator?
The main function of a valve actuator is to control the valves ON to Close or modulating the valve,and the motor operated valve actuator is one important kind of valve actuator,the main different between kind valve actuators is it drive by electric power.
How much does it cost to build a tgv train?
To actually build one is pretty hard but in essence it uses two magnets facing each other, but they are on opposite poles (North on South/South on North) so thus, they repel each other, making the train levitate. That's where the name comes from- Mag (magnet) lev (levitate).
The absolute master is your main shutoff at the water supply. My home has no shower valve, my grandparent's house does as does my parents house. Neither of those valves are in the same place. Who knows what happened between the time your place was built and now? You'll need to trace the path of the pipes to know for sure.
Comparison between centrifugal pump and gear pump?
both gear pump and reciprocating pumps are positive displacement pumps.but the different is gear pump rotary type.reciprocating pump moves liner motion.the piston moves up and down in straight line.
Write an example for thermosetting plastic and thermo plastic?
Thermoplastics can be repeatedly softened by heating and hardened by cooling. Thermosetting plastics, however, harden permanently after being heated once.
An example of thermoplastic is polypropylene (PP - recycling number 5).
An example of thermosetting plastic is polyurathane (PU).
Where does silica come from when tig welding carbon steel?
Silicon is added to the tig rods in production. Use a gas weld rod which does not have the silicon and the weld will be full of porosity.
What are the types of transducers?
Sound -> Electrical (microphones)
Force -> Electrical (Load Cells)
Kinetic -> Electrical (piezoelectric, generators)
Light -> Electrical (solar panels)
Thermal -> Electrical (thermocouple)
Electrical -> Kinetic (Motors)
Electrical -> Magnetic (electromagnets)
Electrical -> Optical (lightbulbs, LEDs)
Electrical -> Thermal (heaters)
Electrical -> Audio (speakers)
*(see the related link below for more information)
A device that converts variations in a physical quantity, such as pressure or brightness, into an electrical signal, or vice versa.
What do you mean by the term mechanical efficiency of an engine?
It is the ratio of indicated power to brake power.
Who was the second person to break the sound barrier?
The second person to break the sound barrier was Clarence "Chuck" Manning. He was my great-grandfather; he fought in three wars and played professional basketball for Alabama.
What does cc stands for in measuring car's power?
The amount of cc's in an engine do not DO anything. The amount of cc's in an engine ARE something. The amount of cc's is the piston displacement measured in Cubic Centimetres. For example : Imagine that the cylinder was filled with water, the piston then rises from the bottom to the top of the cylinder. The amount of water that the piston pushes out of the cylinder (displaced) is then measured in Cubic Centimetres. If each cylinder was 100 cc a four cylinder engine's pistons would displace 400 cc 's.
Meaning of seam in seamless pipe?
The difference between seamless and welded (as it is commonly known) pipes is the welded joint along the longitudinal direction. Seamless pipes are manufactured by continuous extrusion process. Seamless pipes have greater bursting and tensile strength than the welded ones.
What mechanical devices produce reciprocating motion from rotary motion?
It is the reciprocating motion of the pistons that is changed into rotary motion by the cam axle.
