Industrial Engineering

Resistance: Electrical resistance describes how an electrical conductor (a wire) opposes the flow of an electrical current (flow of electrons). To overcome this opposition a voltage (a energy) must dropped (used) across the conductor (wire). Resistance can be described by ohms law: Ohms Law: R = V / I (Resistance = Voltage / Current) (resistance measured in ohms) where: Voltage [V]= the energy lost across an component (voltage measured in volts). Current [I] = the charge (electrons) flowing through an component (current measured in Amps). Electrical resistance can be thought of as sticking your hand out a car window. The faster [current] you drive the harder the wind presses [resistance] against you hand and therefore it takes more energy [voltage] to hold your hand steady. When trying to overcome electrical resistance, the electrical energy lost is turned into heat. This is how the elements of a household stove, toaster, and fan heater work. Because of the vacuum in a light bulb, the electrical energy lost is instead turned into light. It can be seen the electrical resistance plays a large role in modern life. Resistor: The resistor is the most common electronic component and is used to limit and/or control the voltage and current in an electronic circuit. Resistors are carefully manufactured to provide a predetermined value of electrical resistance which may range from 0.1 ohms to 100,000,000 ohms, depending on the application. The physical size of a resistor also varies dependant on the amount of power passing through the resistor, given by: P = V x I (Power = Voltage x Current) (power measured in watts) There are also many types of resistors including: · Variable Resistor - changes resistance when its shaft is rotated (volume knob on a stereo). · Thermistor - changes resistance when the temperature changes (used in a thermostat). · Light Dependant Resistor (LDR) - changes resistance when the lighting changes (used in children's night-lights). Resistor Example: An LED is a small red light (such as the one on the front of most TVs) and requires 2.0 volts and 0.02 amps to operate correctly. If we connected that LED up directly to a 12 volt battery, the voltage would be too high, and too much current would flow… the LED would blow up. We need to use a resistor to limit the voltage and current. But which value of resistance should the have resistor? Uses ohms law: R = V / I = (12.0 - 2.0) / 0.02 = 500 ohms (Note: the voltage across the resistor is the battery voltage minus the voltage we want across the LED) But which value of power should the resistor be capable of handling? P = V x I = (12.0 - 2.0) / 0.02 = 0.2 Watts

Advantages: Very sturdy, can have several cracks in structure before breaking

disadvantages: best for short distances, not attractive, hard to maintain

what is bite angle in rolling mill

Lloyd Ray was the first African American to receive a patent for improving the dustpan by attaching a short, wooden handle to a metal collection plate. He received the patent on August 3, 1897.

You need a four year BS degree at major universities and a good interview during this or following. Working as a paid or unpaid intern while in college can make the job hunting easier.

After you receive your degree, some states require you to work with a professional engineer for a period of time before you are allowed to take your state's PE exam. For example: In California you must work under a PE for 2 years before being allowed to take the PE exam, but in Nevada it's 4 years.

Partly due to scale of manufacture, partly due to the cheap and simple method of extraction from the ore, partly due to the ease with which the adundant ore can be mined, partly due to the high (compared to many metals) metal content of ores.

These are plastics which are softening while temperature increases.

Such property makes forming of end products easy.

Examples are:

Polyethylene, Polypropylene, Polystyrene, Polytetrafluoroethylene also known as Teflon, Polyvinyl chloride (PCV) to name few popular.

There are different types of pewter, but usually it's about 90 percent tin and 10 percent copper. This is called an alloy, when two or more metals are physically mixed, but do not react with each other. Other alloys include steel, bronze, and brass.

You need also to know the resistance of the cable. First you establish what the current of the load is. Then from that you calculate the wire size. From a wire size chart you find the wire resistance. Then use the formula I (squared) x R.

The reason you call it a building is because it was built as you would call something that was carved a carving or something that was painted a painting.

generally the generators are synchrozised by checking three conditions

1. their terminal voltages must be the same

2.their frequencies must be same

3.their phase sequence must be same

if any one of the conditions are not satisfied and they are connected in parallel then the machines will be burnt with in a fraction of second

800 cubic centimeters.

One similarity is that they both use fluids. Both gasses and liquids are fluids. the two are also compressible.

The answer is all of them

Process engineering helps obtain the specifics of a certain industrial process. In the biotech industry, the quality of the final product has a huge bearing on the right physical and chemical conditions being maintained.

Therefore, the industrial process has to be engineered in order to obtain product starting from raw material.

thermosetting plastic becomes hard when heated and deteriorates by excessive cross linking and thermoplastic becomes soft and can be moulded into any shape.

By stronger, we need to define the loading conditions of the rod or pipe. The strength of a rod or pipe is typically evaluated with axial, transverse (bending), and torsion loads.

With the same diameter and the same material, a solid rod is stronger than a hollow pipe. However, with the same weight and material, the hollow pipe is stronger than a solid rod.

Because a hollow pipe is lighter than a solid rod at the same diameter, the hollow pipe would have a larger diameter in order to match weights with the solid rod and a larger diameter rod or pipe is stronger than a smaller diameter one.

Brushed nickel has a brushed dull finish. Polished nickel has a smooth shiny surface.

starting range would be from 10 to 15 thousands if you get a job in a good country...as first the will see your work and as you will keep working in the same compeny your salary would keep increasing it can go up 1 lakh or a little bit more after a great experince.....

who invented the clothes dryer that used heat from the stove

As systems, neither one is better than the other. There is no "Better", only "More suitable for a specific purpose." Car tyres are Pneumatic... they're full of air. Air is compressible, which is why it's used. If you filled your car tyres with Hydraulic fluid (which is incompressible) you would not only increase the weight of the tyres dramatically (and hence increase the relative tread-wear), but also make them hard, decreasing their ability to absorb shock. This would defeat many objects in the design of car tyres! The rams on a digger or crane, however, are Hydraulic. They need to be filled with something that is not compressible in order to fulfill their function. If you were to fill the rams on a digger with air the arm would bounce up & down like a yo-yo! Also, at the pressures required by these systems, air would quickly leak from the seals, no matter how tight they were. Hydraulic fluid, being far more viscous than air, however, does not leak under the same conditions. As a rule, Pneumatic systems are employed where a certain amount of "play" or "give" is required, or where the loss of fluid would be undesirable (Air power-tools for example) Hydraulic systems are used when extremely great pressure is needed in order to move something. Hydraulic systems are also easier to control & regulate due to their ability to retain pressure indefinitely. There are many uses for both Hydraulic and Pneumatic systems but because both types have specific roles, there is no saying that one system is better than the other.

it goes back to the rock cycle.

it is a simulation of real running turbine or compressor blades, since it is difficult to study a rotating and mooving machin, its better to fix the blade and let the air circulate, then study all the parameters... bilal el samad mechanical engineer

a dedicated computer control the machine tool in CNC and in DNC a no: of machines are controlled by a central computer.