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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
Mechanics means "one thing follows another in a logical chain". Mechanics is not a physical term in the first place, but a logical term. When something happens, it has consequences, and the joint event of both is addressed as of "mechanical nature". So, the study of anything that involves learning in-depth the knowledge of the intimate behavior of something is known as the mechanics of said something.
In Physics, Mechanics is, again, the study of the intimate behavior, of phenomena involving all of the existent. Classical Mechanics is both a specific subject and a general scope for the study of Physics; it get in-depth in the study of solid objets (Solid Mechanics) in both their stages of rest (Statics) and movement (Dynamics), with special interest in the behavior involving motion (Kinematics) and energy (Kinetics). Later on, all these concepts are reapplied for the study of non-solid matter: fluids, hence called Fluid Mechanics (which has two clear branches: the branch that studies the behavior of liquids - Hydraulics, and the one that studies the behavior of gases - Pneumatics). The latter subject is intimately bonded with the study of mechanics of energy, especially regarding heat (Thermodynamics). There are many other subjects dubbed with the term Mechanics, and all of them share the common factor of studying the intimate behavior of a given phenomenon.
In Engineering, Mechanics involves the application of techiques, all born in Physics, in a quite many fields. Solid Mechanics, Fluid & Thermodynamics, Optics, Materials Mechanics, Hydraulics, Pneumatics; are some of the examples covered.
As a technique, the term is usually addressed to activities involving the use and maintenance of machinery. Automotive mechanics, which is the work done in the car shops, is usually abbreviated to "mechanics" as an idiom. Industrial mechanics is the activity that involves using, repairing and tooling industrial machinery, especially when speaking of metal-mechanical machinery (lathes, presses, forges, etc.), this is, where the prime matters to be worked over are metals; but it can also apply to activities where prime matters are not metals, like plastics and wood. The work with machinery for construction and moving earth businesses is not usually addressed as industrial mechanics, though many of the activities involved certainly fit in the term.
Why do you use kelvin instead of Celsius?
Kelvin and Celsius are both units used to measure temperature. Celsius is typically used in countries that use the metric system. Kelvin is used in a scientific or academic setting, because it's scale is more precise than Celsius.
What is crashing in CPM technique and what is time-cost ratio and how is it useful in crashing?
crashing is the technique of minimizing the total duration of a network of activities, mainly by reducing the duration of the critical path activities to the least possible magnitude.
Since the critical path is also the longest, the duration of this path has to be reduced. However any reduction in activity duration comes at the cost of increased cost due to extra resources required(like labor, electricity etc). Also note that simply reducing the duration of a critical path activity is meaningless unless the duration of parallel activities are also reduced by equal magnitude. Then and only then will the total duration get reduced.
Sometimes the non-critical path activities have floats(ie expendeble time). In such a case while crashing such an activity, first the floats are removed. Only then can its total duration be reduced.
How do you find diameter of a shaft when bearing no is given?
How do you find dia meter of shaft when bearing no is given?
How does A bootstrap air cycle machine in an aircraft work?
The air cycle machine (ACM) is driven by turbine engine bleed air that first passes through a primary heat exhanger (much like an intercooler for a turbocharged automotive engine) that significantly lowers the temperature of the 300-500 degree bleed air. After leaving the primary heat exchanger the air flows into a compression turbine that increases the pressure of the air and also increases the temperature.
After leaving the compression turbine, the air flows into a secondary heat exchanger that once again lowers the temperature of the air. At this point, the air is at extremely high pressure and relatively low temperature. From the secondary heat exchanger the air flows into the "expansion turbine" where this high pressure air is used to drive a turbine wheel that performs several functions: 1. It extracts energy from the high pressure air, 2. Allows the pressurized air to expand, 3. Drives the compression turbine. The extraction of energy from the air and subsequent expansion of the gases drastically lower the temperatures of the air. In fact, the air temperature is lowered so much that often times hot bleed air is bypassed around the ACM and ducted to the air coming out of the expansion turbine to raise the temperature above freezing.
The output air that is coming out of the ACM is then sent through a moisture removal system that essentially uses a fine mesh weave to collect small droplets of water. This removal of moisture helps to control the humidity of the air entering the cabin and it also prevents icing downstream in the system.
What are the uses of rigid polystyrene?
The uses of rigid polystyrene are containers such as cosmetic bottles, TV cabinets. etc. In its sheet form it is used to make disposable cups.
Blow moulding is when plastic granules are injected into a mould after being melted, and then compressed air is blown into the mould to hollow it out. This can make shapes like bins and bowls.
The answer is not formulatic. There will be a parabolic shape from the dead load and a discontinuity at the point load.
Shock load is a machining term. Shock load is when a sudden intense force is placed on the parts of a machine. The machine often cannot handle the pressure.
A Catchpot (GB Pat No 2302394) was invented by UK inventor Dennis Henson. A Catchpot is a container device used to catch some of the water flowing from float operated water valves. The Catchpot has bleed holes and internal siphon's and is usually attached to the lever arm of the valve. The Catchot's purpose is to create a delay in the opening and closing of the valve and improve the valves flow performance.
The word Catchpot is a registered trademark of Henson Delayed Valves Ltd.
TRIP steel is Transformation Induced Plasticity steel. It is a composite steel that consists of ferrite, bainite, martensite precipitants and restrained austenite. The austenite will transform into martensite when strained, thus increasing the strength of the steel. To stabilize the austenite you need to introduce alloy elements, usually Manganese.
1 Describe with the aid of sketches the behavior of beams and columns under load?
the beam will sag downwads
SA36 would have more traceability and QA requirements, and as a result can be used safely at slightly higher stress levels. But physically, they are the same.
What is the advantage of a posidrive screw over a slot headed screw?
A posidrive screw stays centered over the driving tool. On Slotted head screws, the screwdriver can slip easily out of the groove. A very nice kind of screw is the "TORX" head screw. With the proper torx bit, they cannot slip or strip easily while screwing them into wood or metal.
A detailed listing of the rules and principles that apply to specific welded products is called?
A weld procedure.
Why I-section beam is preferred for heavy loading?
Cross sectional shape I, giving many benefits. It is very good for giving stiffness(less deformation on loading) and to withstand higher bending moments(as a result of heavy loading) on comparison with other cross-sectional shapes of same area. Also, it is very easy to manufacture.
It will have more moment of inertia due to the distance of the flange from the centroidal axis and it have zeron eccentricity about one axis and the centrer of gravity lies inside the web.
Steel wire is commonly known as wire rope. Several layers of metal wire are twisted to form a rope. Steel is the main material used in wire rope today. The product was developed in the 1830's and was primarily used in mining when applications that could lift and hoist weights in elevators were essential.
