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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 proportional integral and derivative control system response?

The proportional integral and derivative control system or PID control system consists of proportionsl, derivative and integral elements which gives a very efficient process control.

Why it is not good for diesel generator run with minimum load?

below some about 25% (or maybe 50% depending on the model) of their full rated capacity, or else condensation can occur in the exhaust system.

That causes corrosion and a shortening of lifetime or at least increased maintenance cost.

The minimum load ratio has no direct effect on the operating hours of the generator, it is simply a constraint on how low the generator power output can go. But raising the minimum load ratio could indirectly lead to fewer operating hours because the generator is more productive when it runs.

Why does bus and lorries have rear wheel drives instead of front wheel drive?

Buses and lorries are so heavy that it's starting to become difficult and expensive to have the steering wheels also work as drive wheels, so they usually settle for only having the simpler rear axle as drive wheels.

What is the use of recirculation line in boiler feed pump?

A recirculation line in a boiler feed pump is used to return part of the pumped water back to the inlet of the pump. This helps to prevent cavitation and maintain a steady flow of water through the pump.

Cavitation is a phenomenon that can occur in pumps when the pressure of the water being pumped drops below the vapor pressure of the water. When this happens, bubbles of vapor can form in the pump, which can cause damage to the pump and reduce its efficiency.

The recirculation line helps to prevent cavitation by returning part of the water that has been pumped back to the inlet of the pump. This increases the pressure of the water at the inlet, which helps to prevent the formation of vapor bubbles. As a result, the pump can operate more efficiently and reliably.

Overall, the use of a recirculation line in a boiler feed pump helps to prevent cavitation and maintain a steady flow of water through the pump. This can improve the performance and reliability of the pump.

How do you calculate wire sizes required for making a Wire Rope?

It is easy for wire rope with construction of 6x19,6x37 and 6x61 because all wires in a strand have the same diameter but for other construction needs math knowledge.

Y pattern globe valve advantages over T pattern?

Y pattern globe valves allow probably less pressure drop as compared against the T pattern globe valves. I do not have experimentally proven results for this. However the flow pattern in Y Globe valve is more "linear" while that T pattern is more "zigzag". Secondly, height of the valve from its flow bores' center line till top of the hand wheel is less in Y Globe Valves, as compared against the T Globe Valves. This gives compactness to Y Globe Valves - which is beneficial in pipings where space is a constraint. [by Ganesh Devale, Pune - India]

How do you measure a diagonal?

If the diagonal is the hypotenuse of a right triangle, you can use the Pythagorean theorem: a^2 + b^2 = c^2, where a and b are the lengths of the sides that make the right angle, and c is the length of the hypotenuse.

What is 1 sigma?

Well then, You'd better ask someone cleverer than me!

(The first answer to this question had the correct answer and I'm messing it about.....)

How can you apply displacement controlled load with eccentricity on RC columns working inside ansys?

Use a enforced displacement boundary condition. Use a lot of substeps and force/moment reaction probes to know when you're at the load(s) you want. A free body diagram should tell you that.

What is the formula to determine speed of a driven pulley or sprocket using RPM and Diameter?

For a pulley, it is driver RPM x driver diameter = driven RPM x driven diameter. Keep in mind that the diameter you should use is the diameter where the belt is riding in the pulley. For instance, an A belt in an AB pulley will ride lower in the pulley than it would in an A pulley. For sprockets, the formula is the same, but replace the diameter with # teeth. It looks like this. driver rpm x # teeth of driver sprocket = driven RPM x # teeth of driven sprocket

How does an Airplane with its tire burst during take off land?

There would be 2 chooses. If it is not too serious (only one wheel) they can try and land on the remaining wheels. If it is really serious a belly landing would be the next best option.

How do you identify EPDM rubber?

The best way is via infrared analysis. If you do not have any instrumentation available, you can burn a small piece of the rubber. When removed from the flame EPDM will give off a sooty smoke that smells waxy (like a burning candle).

What is the types of modulus of elasticity?

1. Young's modulus of elasticity, E, also called elastic modulus in tension

2. Flexural modulus, usually the same as the elastic modulus for uniform isotropic materials

3. Shear modulus, also known as modulus of rigidity, G ; G = E/2/(1 + u) for isotropic materials, where u = poisson ratio

4. Dynamic modulus

5. Storage modulus

6. Bulk modulus

The first three are most commonly used; the last three are for more specialized use

What is the chemical symbol for brass?

There isn't a chemical symbol for Brass. It is an alloy; a mixture of metals in various proportions, depending on what qualities are desired in the final product.

Brass is an alloy of Copper (Cu) and Zinc (Zn). Its chemical formula is CuZn

Which arc welding process would shipbuilding industry use?

In European Shipbuilding Industries used

SMAW,GTAW,GMAW,SAW,FCAW(MAG).

In INDIAN Shipbuilding Industries used,

LBW,EBW,EGW,ESW,FCAW,SAW.

What metric class of fit is f7?

f7 (yes, it really does matter whether you use an upper case or lower case letter) is a shaft tolerance, which is, generallyspeaking, used for close tolerance (clearance) fits.

But it depends on the size of the mating component.

How is hydraulics used in construction machinery?

Common place uses would be for your JCB and earth movers, the buckets/shovels on them are powered by powerful hydraulic systems.

A less common use for them would be winches, jacks and hydraulic hinges.

What is the difFerence between nc and cnc?

NC is numerically controlled (hard wired) and CNC is computer numerically controlled.

What is a difference between b-15 lens on ray-ban glasses and polarized lens?

B-15 lens are brown in color and G-15 lenses are gray-green. Polarized lenses come in both colors and on the lens it's written Ray Ban P

What are the disadvantagers of mechanical vibration?

A mechanical vibration can reach a self resonance possible destroy itself and everything connect to it