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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 materials are used for jet turbines?
A simple principle.
Water is pumped by way of gravity or mechanical means under pressure. A hand crank in this case.
Water hits the fan blades and that turns a shaft which is a power source.
And in this case it turns a simple generator which lights a red light.
Tips: Use this principle to build your own to turn a car generator to generate DC current to charge batteries Or use a power inverter with the DC generator to make AC power Use a stepup transformer to power a DC water pump that turns the turbine Use as a DC power source for the Project "Canned Heat"
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Large scale hydroelectric power has been used worldwide for a long time to generate huge amounts of power from water stored behind massive dams. Small scale hydropower has been used for hundreds of years for manufacturing, including milling grain, sawing logs and manufacturing cloth. However, it can also be used without a dam to generate electricity for home scale remote power systems. These so-called micro-hydro installations can be a very good complement to a solar power system, as they produce electricity 24 hours a day. Waterwheels--It's important to differentiate between water wheels and water turbines. A water wheel is more akin the antique version we are all familiar with--a massive wooden wheel that slowly turns as the creek pours down over it. Water wheels spin slowly, but with lots of torque. They are also surprisingly efficient! One very good place to go for waterwheel information, kits and photos is The Waterwheel Factory.
NEW 6/21/2004 --- Scotty's new homebrew hydro plant, using a Banki Turbine design built from scratch. The generator is a homebuilt permanent magnet alternator, very similar to our Brake disc alternators. In a Banki design, the water hits the vanes twice, once upon entrance and then again upon exit. There is only about 3 feet of head available at the site, and the system is producing about 2 amps at 12VDC, fed by a 4 inch pipe. Check out the page about it HERE. A while back, one of our neighbors constructed a water wheel generator using a squirrel cage fan, belt, pulley and surplus tape drive motor that produced a steady 1-2 amps of power, 24 hours a day. He used a natural dam (a log that fell across the creek years ago) to get the fall and to mount the generator on.
What is better between mechanical engineering or quantity surveying?
A quantity surveyor is construction cost engineer, who is involved in cost estimates for building works. He prepares bills of quantities from drawings prepared by civil engineers and architects. he's know for cost palnning and control of construction. he also prepares contracts documents and manages the project till completion alongside other professionals.
A civil engineer on the other hand is a designer mostly concerned with the structural design of structures such as buildings, bridges, roads, railways, dams, pipelines, airfields etc. he doesnt care about cost he cares about the structure not collapsing.
I trained as a quantity surveyor then later studied civil engineering so i fully understand the difference between the two.
How is the capacity of a screw compressor controlled?
Capacity control is the process by which the flow of the discharged gas from the compressor is controlled. This can be accomplished by several method.
1. Controlling the speed of the compressor.
2. Controlling the clearance of the compressor.
3. Throttling the suction valve.
4. Suction valve unloader.
What are the 7 standard machine tools found in machine shop?
Some of the different types of machine tools that can be found in a machine shop are:
- Center lathe
- Milling machine
- Shaper
- Horizontal boring mill
- Vertical boring mill
- Radial arm drill
- Slotting machine
- Cylindrical grinder
- Gear grinder and Gear shaper
- Various types of CNC: Lathe, machine center, milling machine, etc.
Differences between thermodynamics and fluid mechanics?
thermodynamics:
1) it deals with the equilibrium states of matter & precludes the existence of a temp. gradient.
2) when a system changes from one equilibrium state to another, thermodynamics helps to determine the quantity of work & heat interactions. it describes how much heat exchange during a process is required but doesn't hint on how the same could be achieved.
heat transfer:
1) it is inherently a non equilibrium process since a temp. gradient must exist for the heat transfer to occur
2) it helps to predict the distribution of temp across a surface and to determine the temp. gradient that exists between different surfaces
How does the helicopter get its lifting force?
the helicopter pushes forward when the pilot pushes the cyclic control forward. that rotates the blades forward . while pushing forward on the cyclic, the pilot must also pull up on the collective control. that will add pitch to the blades, thrusting the helicopter forward.
What is the difference between ANSI and BS standards?
ANSI valves are based on American National Standards Institute Standards. For example, ANSI 16.34 refer to steel valves. BS valves are based on British Standards. For example, BS1212 refer to ball valves excluding floats.
What is the mechanical advantage of a machine which only changes the direction of the applied force?
One.
Since the question clearly states that the machine only changes the direction there can be no mechanical advantage gained.
In order for a machine to have a mechanical advantage greater than 1, the machine must be able to change two or more of these factors:
- The amount of force exerted
- The distance over which the force is exerted
- The direction over which the force is exerted
What is the difference between centrifugal compressor and screw compressors?
A rotary compressor is like a car engine, with pistons, rods, sleeves, valves, etc. A screw compressor has two screw type rotating parts that squeeze the refrigerant as the screw threads get tighter and tighter. They have long life potential.
What are some advantages and disadvantages of aluminum?
well they are used for your mom when i did her and then you came in and i said what the hell get out of here werid o and take that aluminum can with you that's my hor and your pratice toy get it out of here
What are uses and applications of erw pipes?
Sch 40 electric resistance welded pipe is generally used for utility lines such as compressed air and water lines.
How ordinary iron to stainless steel?
Oversimplifying it alot:
Iron + Carbon --> High Carbon Steel
High Carbon Steel + Chromium & other surface alloy metals --> Stainless Steel
Basically Stainless Steel is ordinary Steel with a surface Chrome Steel layer protecting it from corrosion.
Where is a crank and slider mechanism used?
The theory of the Slider-crank mechanism is while the entire mechanism has six free degrees, the whole system only has one free degree. When those six degrees start moving, the whole thing can only move in circular motions.
What is meaning of water level sensor?
Level sensors are designed to detect the level of substances that flow. The idea behind a water level sensor is that it can detect the level of water in any given scenario.
What metal is hardest to melt?
Tungsten or wolfram is a natural metal with the highest melting point. The metal also has the highest tensile strength.
Advantages and disadvantages of truss bridges?
Advantages: Very sturdy, can have several cracks in structure before breaking
disadvantages: best for short distances, not attractive, hard to maintain
i need the answer too..plesase anyone help me with that..now,asap
Difference between runout and total runout?
if you are measur any diameter then in a specific place difference in diameter it is run out but, if the deviation in diameter is along the length then it is total run out
What is formula to calculate the weight of steel bar?
volume of steel multiplied by7850= wt of steel in kgs.
Please note that wt of 1 Cum steel is 7850 kg
Volume of steel bar can be calculated = cross-sectional area of bar X length
cross-sectional area of Bar= pie x d X d/4 (where d is diameter of bar)
How do you remove a rusted cast iron waste pipe without damaging it or the threads?
Mix up a glob of JB Weld and then screw the cap in. Once that sets, it is never coming out. The other answer would be to get a rubber connector boot bigger than the pip and connect a new piece of PVC which you could cap. vbd Purchase a No-hub clamp at a plumbing supply house, along with a cap, or cleanout plug. The No hub clamp slips over the damaged threads, and connects the new fitting. Tighten the screws. Done! There is a plug availible, rubber with a washer each side and a bolt running thru it with a wing nut on the top side. Simple insert into the hole and tighten the wingnut. This compresses the rubber causing it to swell out and plugging the hole.
What is taper turning on lathe machine?
An operation performed on a lathe that feeds a tool at an angle to the length of the workpiece in order to create a conical shape.
What is stronger solid shaft or hollow shaft?
Depends on what you mean by "better".
For the same dimensions, a solid shaft will be a bit stronger, but also a lot heavier.
If you were to make a hollow shaft of the same weight, but a bigger diameter, it'd be a lot stronger than the solid shaft.
How is an alloy of two metals produced?
Answer Usually by heating the metals so they become molten and adding other metals and compounds. However, if you study history, you find that early black-smiths and sword-smiths developed Steel alloy in their ovens without completely melting the metal. The would heat the wrought iron in hot coals to soften the metal. Then folded the iron over and pounded it, then re-heated it and repeated the process. The carbon in the coal ashes introduced carbon into the iron, transforming it into Steel. When they cole-quenched it, the iron molecules expand enough that the carbon molecules enter into the matrix. When it was cooled rapidly, the carbon would be captured in the steel.
What is the equation for the natural frequency of a cantilever beam?
If you know the natural frequency and the mass of the load and beam... k=Wn^2*m (where k=stiffness, Wn=natural frequency, m=total mass) If the beam's mass is not negligable then the total mass is... m= m(load)+1/4m(beam) I'm wondering if this link might help you ;-) http://www.vibrationdata.com/StructuralDC.htm Here is a paper that solves a problem by studying the Cantilever Beam. A few pages into this paper, it has the mathmetical expressions for its the first 3 vibration modes and frequencies. http://faculty.uml.edu/pavitabile/22.403/web_downloads/Final_Project_Cantilever_101806.pdf One more link: http://www.kxcad.net/RecurDyn/RecurDyn_Ver6.3/programmanual/Eigenvalue_Analysis/Application/Cantilever_Beam/Cantilever_Beam.htm
