Mechanical Engineering

ASTM A672 covers B70, C70 and L70 grades. Equivalent for each of them do you need?

Chuko Liang of China invented the wheelbarrow.

E6013 is a mild-steel, all position, general-purpose welding electrode (rod).

Given the vector in angle-radius form? y-component=r sin(theta), x-component=r cos(theta)

The centre lathe has only one coaxial tool, whereas the capstan has a rotating

multi tool station with indexer and clutch.

A major cause of decomposition of transformer oil is minor arcing within the transformer. Decomposition results in gas which bubbles towards the top of the transformer and upward into the conservatory tank. Between the transformer and conservator tank is a Buchholz relay, in which this gas collects, causing a mercury switch inside a float to initiate an alarm in the substation. This gas can be collected through a small pipe feeding from the Buchholz relay in order to have it analysed.

I hate questions like this one. Do you know why? Because I fear that the TEACHERS asking the question of their students are either IGNORANT of the subject matter they are supposed to be teaching or are asking a TRICK question of their students, which is almost always intellectually dishonest. Hopefully, it's just a poorly worded question by the poster of the question. Okay, I'll shut up and answer the question. A quantity of cold air can occupy a greater volume of hot air -- if there is more cold air than hot air!!!! If you've got two liters of cold air, that's a greater volume than one liter of hot air!!!!!! But what if you've got 0.1 kilogram of hot air and 0.1 kilogram of cold air? You've got the same amount of matter, right? They have the same mass: 0.1 kg. Will the hot and cold air occupy the same volume? NO!!! The hot air is less dense, which means it occupies MORE volume per unit mass than the cold air. So, if you have equal masses of hot and cold air, the hot air will have greater volume.

Yes. More power out of the same engine volume, cleaner burn.

In metalworking, rolling is a metal forming process in which metal stock is passed through a pair of rolls. Rolling is classified according to the temperature of the metal rolled. If the temperature of the metal is above its recrystallization temperature, then the process is termed as hot rolling. If the temperature of the metal is below its recrystallization temperature, the process is termed as cold rolling. In terms of usage, hot rolling processes more tonnage than any other manufacturing process and cold rolling processes the most tonnage out of all cold working processes

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Static means 'stationary', or 'not moving'.

Force (load) = Pressure X Area

Physical properties means the behavior of materials in response to physical forces other than mechanical, such as; Volumetric, thermal, electric and electrochemical properties. Most Ceramics are lighter than metals but heavier than polymers.

Most ceramics have a higher melting point than most metals as it is that some ceramics such as China can with stand high temperatures to about 1200 degrees centigrade. Ceramics also has lower Electrical and Thermal Conductivity than most metals but the range of value is greater in ceramics permitting some ceramics to be used as insulators, for example Porcelain insulators and others as conductors like Lithium-ion conducting glass-ceramics and oxide ceramics.

Thermal expansion is another physical property of ceramics, Ceramic thermal expansion coefficients are less than those of metals but effects are more damaging in ceramics bringing about cracks and other failures(Thermal shock and thermal cracking) as for ceramic materials with relatively high thermal expansion and low thermal conductivity however there is glass ceramics that has low thermal expansion thus resisting thermal shock and thermal cracking, for example Pyrex glass ceramics. Thus the physical properties being but not limited to permeability, elasticity, considerable strength, hardness, brittleness, resistance to chemical attack and thermal shock.

(to check the flow rate of water ... calculate the pressure drop

Do not know the term, Weldolet, but if your question is where or how do you decide where you are going to cut a pipe to add a branch line, then it is a matter of where it is possibe and the easiest to do. It is not always as close to where you would like it, but where it makes the most sense to do it. Depends on the type of pipe involved also. Copper or PVC you can cut any place you want. Steel, you can replace a coupling with a T and a union if it is in the middle of a run. With steel either black or galvanized you will have to add a union or go back to the end of the run and take everything apart.

Weld-o-lets are sized for the diameter of the pipe you are tying into and the diameter of the pipe you are adding. Example: 2" x 3" or 6" x 10". If you need the branch pipe to have a theaded connection you would select a Thread-o-let instead. Sizing is the same. Some o-let's can be used for a range of piping sizes. Example: a 3/4" thread-o-let may have 8-12 marked on it meaning you can weld it on to either 8", 10" or 12" pipe.

It would be permanently deformed, then break.

Without knowledge of the pressure in the air cond. lab. unit you will not be able to calculate the mass flow. Without the mass flow you cannot do any analysis of the system.

Steel toe shoe rating that is related to the force per square inch capacity that the steel toe can withstand.

1 BAR = 100kPa = 14.5038 PSI

A very good periodic table. See the Web Links to the left of this answer for a periodic table with melting and boiling points, and other tables with the melting and boiling points of the elements. Go to this awesome site: HTTP://WWW.MATWEB.COM and find most any comercially-available material (all metals, plastics & ceramics). You can sort by property, which makes it easy to find the best material for your application.

High pressure (HP) and Low pressure (LP) bypass systems are used for quick start-up of the unit as well as during trip-out, where load rejection at the turbine does not automatically lead to a boiler trip. With a bypass system, start-up is quicker. The system diverts the steam generated by the boiler to the Re-heater/Condenser, at the same time reducing the pressure and temperature of steam, thus maintaining a minimum circulation of steam through the boiler. This enables running the boiler without the turbine in service, ensuring flow through re-heater coils.

HP-LP bypass system has the following advantages :-

1.The prolonged venting of safety valves to atmosphere is avoided, thereby reducing DM water loss and cutting noise emission.

2.Sustained flow through the boiler heating surfaces is assured, ensuring Re-heater protection during start-up of units.

3.If the grid cannot accept power, the unit can be kept running on house load.

A rubber band boat works much like a rubber band airplane. First you need to build the boat itself. Then you need to make a propeller. The propeller shaft needs to run through the inside of the boat, not below the boat. With the prop below the water. The propeller shaft should not go the full length of the boat. About halfway through put a loop in the shaft. Then to the front of the boat attach a rubber band. Then run the rubber band through the loop in propeller shaft. Now twist the prop and the rubber band should twist around and around. When it's good and tight let go and the propeller should spin. Allowing the boat to move forward in the water.

Mind you the shaft needs to be a thin piece of metal, as it will be difficult to make it water tight.

Its not only about rotor, Core losses of every machine which has core are fixed and only vary with Voltage variation.