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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
Intelligent stepper motor controller with RS232 or CAN 2.0?
UIrobot featured Stepper Motor Controllers size only 42.3mm*42.3mm*13.5mm which include Parallel, Serial and CAN Protocol type Stepper Controllers for directly mounting onto size 42/57/86/110 and so on stepper motors. Super compact volume, high performance, standalone or integral usage, easy wiring, strong driving force are the feature of our products. Till now on, UIM stepper controller can use 10V-40V DC supply and drive 8 amps. High voltage supply to 80V and 32, 64 microstepping is coming to the market very shortly.
a coumpound pulley is when there is a fixe pulley and movable pulley working together
How much down force is needed to lift a helicopter?
The same force as the weight of the helicopter and its crew and cargo.
Why must acetylene cylinders be stored upright?
Because the acetylene is stored dissolved in acetone. You don't want to get any liquid acetone up into the valve area where it can get into the regulator, as it can damage the regulator. If the tank does go on its side, be sure to set it upright and let it be for awhile before putting it in use.
Describe Burger vector in fcc material?
Slip in FCC (face centered cubic) crystals occurs along the close packed plane. Specifically, the slip plane is of type {111}, and the direction is of type <110>. In the diagram, the specific plane and direction are (111) and [-110], respectively. Given the permutations of the slip plane types and direction types, FCC crystals have 12 slip systems. In the FCC lattice, the Burgers vector, b, can be calculated using the following equation:[1] : [1] Where a is the lattice constant of the unit cell. Unit Cell of an FCC material.
What is the cop of vapour compression cycle?
3. Vapour Compression Refrigeration Cycle
Vapor-compression refrigeration is one of the many refrigeration cycles available for use. It has been and is the most widely used method for air-conditioning of large public buildings, offices, private residences, hotels, hospitals, theaters, restaurants and automobiles. It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods and meats, refrigerated trucks and railroad cars, and a host of other commercial and industrial services. Oil refineries, petrochemical and chemical processing plants, and natural gas processing plants are among the many types of industrial plants that often utilize large vapor-compression refrigeration systems. Refrigeration may be defined as lowering the temperature of an enclosed space by removing heat from that space and transferring it elsewhere. A device that performs this function may also be called a heat pump.
The vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Figure 1 depicts a typical, single-stage vapor-compression system. All such systems have four components: a compressor, a condenser, a Thermal expansion valve (also called a throttle valve), and an evaporator. Circulating refrigerant enters the compressor in the thermodynamic state known as a saturated vapor and is compressed to a higher pressure, resulting in a higher temperature as well. The hot, compressed vapor is then in the thermodynamic state known as a superheated vapor and it is at a temperature and pressure at which it can be condensed with typically available cooling water or cooling air. That hot vapor is routed through a condenser where it is cooled and condensed into a liquid by flowing through a coil or tubes with cool water or cool air flowing across the coil or tubes. This is where the circulating refrigerant rejects heat from the system and the rejected heat is carried away by either the water or the air (whichever may be the case).
The condensed liquid refrigerant, in the thermodynamic state known as a saturated liquid, is next routed through an expansion valve where it undergoes an abrupt reduction in pressure. That pressure reduction results in the adiabatic flash evaporation of a part of the liquid refrigerant. The auto-refrigeration effect of the adiabatic flash evaporation lowers the temperature of the liquid and vapor refrigerant mixture to where it is colder than the temperature of the enclosed space to be refrigerated.
The cold mixture is then routed through the coil or tubes in the evaporator. A fan circulates the warm air in the enclosed space across the coil or tubes carrying the cold refrigerant liquid and vapor mixture. That warm air evaporates the liquid part of the cold refrigerant mixture. At the same time, the circulating air is cooled and thus lowers the temperature of the enclosed space to the desired temperature. The evaporator is where the circulating refrigerant absorbs and removes heat which is subsequently rejected in the condenser and transferred elsewhere by the water or air used in the condenser.
To complete the refrigeration cycle, the refrigerant vapor from the evaporator is again a saturated vapor and is routed back into the compressor.
Refrigeration Process
Process Description
1-2s: A reversible, adiabatic (isentropic) compression of the refrigerant.
The saturated vapour at state 1 is superheated to state 2.
⇒ wc = h2s− h1
2s-3: An internally, reversible, constant pressure heat rejection
in which the working substance is desuperheated and then condensed
to a saturated liquid at 3. During his process, the working substance
rejects most of its energy to the condenser cooling water.
⇒ qH = h2s− h3
3-4 An irreversible throttling process in which the temperature and
pressure decrease at constant enthalpy.
⇒ h3 = h4
4-1 An internally, reversible, constant pressure heat interaction
in which the working fluid is evaporated to a saturated vapour
at state point 1. The latent enthalpy necessary for evaporation
is supplied by the refrigerated space surrounding the evaporator.
The amount of heat transferred to the working fluid in the evaporator
is called the refrigeration load.
⇒ qL = h1− h4
What do you use to build an elevator?
To install an elevator, a vertical shaft has to be constructed. The approval of the design and the carpentry and electrical work should be done by the building agency. The installation of the elevators should be done by the experienced professionals.
What is gouging in welding process?
Gouging is a process where an arc is established between a carbon rod and the metal to be gouged and the metal is melted. A steady flow of air is blown into that molten pool removing the molten metal. Increasing the amperage or slowing down the travel speed allows a deeper gouge. Speeding up the travel speed or decreasing the amperage removes less metal. Copper coated carbon rods are used and are available in different diameters and shapes.
What is the functions of heat power cycle in a steam power plant?
There is no such thing as a heat power cycle in a steam engine.
The power stroke, or strokes, result from pressurised steam being let into the cylinder and moving the piston.
Explain about the heating coil of a storage tank.?
Large tank heaters contain a heating coil. This coil will heat up to very high temperatures, resulting in the heating of the substance that is in the storage tank.Ê
* Mild (low carbon) steel: approximately 0.05-0.15% carbon content for low carbon steel and 0.16-0.29% carbon content for mild steel (e.g. AISI 1018 steel). Mild steel has a relatively low tensile strength, but it is cheap and malleable; surface hardness can be increased through carburizing. * Medium carbon steel: approximately 0.30-0.59% carbon content(e.g. AISI 1040 steel). Balances ductility and strength and has good wear resistance; used for large parts, forging and automotive components. * High carbon steel: approximately 0.6-0.99% carbon content. Very strong, used for springs and high-strength wires. * Ultra-high carbon steel: approximately 1.0-2.0% carbon content. Steels that can be tempered to great hardness. Used for special purposes like (non-industrial-purpose) knives, axles or punches. Most steels with more than 1.2% carbon content are made using powder metallurgy and usually fall in the category of high alloy carbon steels.
PC = 2 Sy [ ((D/t)-1) / (D/t)2 ]
The equation above is unclear: What stands for S, y, D, t?
The one I am using:
PC= 2*E/ (1-M^2)*(t/D)^3
Where E= Elasticity [Young] modulus, M= Poisson ratio, t= wall thickness, D= external pipe diameter
What turns the propeller of an airplane?
A propeller is a very complex airfoil, and its pitch (the "slant" of the blade) is not the same throughout its length. Think about it. The tips are moving very fast (many feet per minute) through the air compared to the parts of the blade near the center or hub. We want to force developed by the blade to be "somewhat the same" along its length, with a bit more near the hub where it's stronger. Use the link below to see how a three-bladed, variable pitch design is manufactured. Be sure to let the first few seconds of "other stuff" go by before the start of the segment on the manufacture of the propeller, okay? And while you're at that site, look at the other related video clips listed on the right. It's really interesting stuff!
What is the definition for the word Pitched truss or common truss?
Single pitch truss is used for example in storage buildings, machine shelters and in residential buildings. Single pitch truss roof enables directing the snow away from passageways. Width of the truss bottom chord can be maximum 20 meters.
1. Problems with emissions control. Rotary engines use direct oil injection and this means oil is constantly burning with the fuel.
2. Economies of scale. Due to the complex nature of rotary engines very difficult to repair in relation to piston engines and very few people are trained to maintain and build these engines
3. Fuel consumption. Rotary engines are notoriously expensive to run on fuel.
4. Lack of low down torque/driveability. Rotary engines makes a tremendous amount of power at high RPM but insignificant torque in the lower rev ranges.
5. Ignorance. If more people disregard all of the above and eventually get to drive a rotary powered for for a while, they'd be converted. Unfortunately almost all rotary owners are petrolheads and adrenalin junkies!
How can you heat a1.2m long pipe uniformly externally?
With heat wrap/ heat tape, there are a few models that have a thermostat built
onto the cord that keep the temp above freezing. Then you should wrap an insulation
tape around the heat tape.
Can a 150 amp arc welding machine be used for welding metal frames?
Depends on how thick the metal parts are, and how well the seams are prepped. You also need to consider the duty cycle of the welder if you're doing serial production or long welds.
How does a 9mm pistol works technically?
Technically, suitable ammo is loaded into magazine. Magazine is inserted into pistol. Slide is pulled back then let go, chambering a round from the aforementioned magazine. Trigger is pulled, causing hammer to move backwards via the trigger bar. Once past point of release, hammer falls, striking the firing pin. Firing pin moves and contacts primer of round, causing detonation of the powder, forcing the bullet forward through the rifling and exiting barrel. Firearm unlocks, casing is extracted and ejected, hammer is cocked, slide catches another round and forces it into the chamber of the barrel. Slide returns to forward most position and the whole process repeats.
An electric motor is a generator in reverse meaning that it can turn electricity into?
An electrical motor generator in reverse means that it can turn the electrical energy to mechanical and kinetic energy.
What are the advantage of SMAW process?
Advantage of smaw :*equipment is relatively inexpensive
Equipment is portable because the welding machine can be powered with gasoline or diesel powered w/ engines.
What is the difference between spherical bearings and cylindrical bearings?
Spherical bearings are round (ball bearings) while cylindrical bearings are in the shape of elongated rods.
Why do you want to enter software field being a mechanical engineer?
I cannot really explain why I choose engineering but I assume it was because of the math and the desire to know how things work.
I choose mechanical engineering after having started my college time as a nuclear engineer. I studied nuclear engineering for 3 years before making the switch and it was the smartest thing I have ever done. I learned one important thing while a nuclear engineer and it was this: Don't get a bachelors degree in any specific type of engineering unless you want to do nothing but go to grad school, med school, or law school.
Why you might ask. Well if you want to find a job easily when you graduate, the easiest ones are the basic engineering fields. Mechanical, Electrical, Civil, Industrial, and Chemical are the main. A nuclear, biomedical, aerospace, textile, or any other specific engineering curriculum will not give you a foundation in engineering that most employers are looking for. You can always go back and get a masters in any specific type of engineering but stick to the basics.
The other thing is Co-op, Co-op, CO-OP! That is the best way to get experience and most companies want a degree + experience. Having a 4.0 and no experience is actually worse than a 3.5 with 4 semesters of work under your belt.
Electrical fusion welded pipes made by rolling plate or sheet into pipe and joined by electrical fusion welding.
