Mechanical Engineering

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.

At engineering level technically both process are same except there definition both process give hyperbolic curve in P-V diagram and straight line in T-S diagram. and even in polytropic process PV^n=constant if n=1 then it is not hyperbolic process it is isothermal process even though the definition says pv=c is hyperbolic process.

The purpose of adding oil to a car i to lubricate the engine. if the engine is not lubricated there will be much more friction between gears and friction generates heat. because energy is needed to create heat that energy is taken away from the energy that would be propelling the car forward. this causes the efficiency yo drop.

10 Gage

The main difference between cast iron and mild steel is the carbon content. Mild steel has a lower carbon content than cast iron. This makes cast iron brittle, while mild steel is much harder.

As the reciprocating pump operates though the reciprocation of the follower,it guides the suction and the compression of water in the pipe.That's so when the rotary motion of the rotor blade is converted into the reciprocating motion, which deliver

it to the reciprocating pump, the suction and discharge takes place.

The minimum yield strength of S355 is 355 MPa

This type of compressor moves air by the use of rotating airfoils countered against static (nonmoving) airfoils. All airfoils are designed to move air "downward", or rearward in a jet engine. Since the purpose of a compressor is to compress, conditions can sometimes develop where the airfoils try to compress more than their design. Air begins to try to flow backwards to relieve the excess pressure. This backpressure is the same as an airplane wing increasing it's angle of attack (say by flying too slowly). The airfoil can't move enough air to maintain the pressure and the result is a stalled airfoil.

Modern jet engines will bleed air out the middle or back of such a compressor to prevent such stalls. Early jet engines had no such protections. A stalled compressor is actually easier to turn. This relieves the load on the turbine powering the whole thing and the engine overspeeds. The pilot sees a surge in the engine. If it overspeeds enough, catastrophic damage may occur to the turbine (it explodes). The compressor bleed lines help prevent such failure.

Vee clock is a kind of equipment used to hold circular workpieces. By clamping the the workpiece on it we can finder centre of the workpiece very easily as jt has a right angle slot in it. It can be also used for check the roundness of a circular job using a dial indicator.

18 gauge is thicker than 20 gauge. 18 gauge is 1.27 mm thick while 20 gauge is .953 mm thick.

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.

In essence it is used in applications where it is important that the resistance of a length of contantan wire doesn't change with temperature. As a student the only time I've ever needed this feature is in experiments involving measuring resistance.

A use for constantan wire is in DC Current Shunts. This is a precision low value resistance placed in series with the load in a direct current circuit that is carrying high current. By measuring voltage drop across the shunt, we can measure the current. In this application it is important that the resistance of the shunt does not vary with temperature (the shunt will heat up under full load) otherwise the accuracy of the current reading is compromised. Typically the resistance of the shunt is set to give 60 millivolt voltage drop across it at full current.

It is the radial distance from spindle center to bed guide ways so that it can be turned with out fouling bed and it is termed as swing over bed. If it is a gap bed machine then another swing specification termed as swing over gap. Another swing specification is swing over cross slide. This specification become important while machining a job in between centers.

The ways are scrapped for a few reasons. First, to ensure a extremely flat surface. Grinding can accomplish this same function on newer systems, but scrapping was a preferred method until recently (and still is for many). Second, the scrapping allows for oil to flow between the turcite and the way to reduce wear.

A foot valve, in relation to a water well, is a check valve at he bottom of a well to keep the water from running back into the well from the pump when the pump is not running. If the check valve does not hold the water the pump will lose it's prime and will not pump water.

i think its a thermoplastic I'm not too shore but when its heated it melts so yeah i guess so :)

An Ideal pendulum is ones that would be the first choice if you could choose all the materials (ideal materials). A practical pendulum is one that is readily available and reliable (made from things you have right now and are available to use).

S355 in bs

the equivalent for c45 is en-8 and en-19 is c55

Need the Chemical composition and mechanical properties of C45 and EN-8 also to C55 and EN-19

Piston is made of cast aluminum because of its high heat transfer rate.One important thing to take care while using it (cast aluminum) is, because it expands appreciably on heating so right amount of clearance needs to be provided or else it will lead the engine to seize.

Buying something 144 at a time (12x12) (dozen x dozen)

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

Mechanical engineers research, develop, design, manufacture, and test tools, engines, machines, and other mechanical devices. Mechanical engineers work in many industries, and their work varies by industry and function. Some specialize in energy systems; applied mechanics; automotive design; manufacturing; materials; plant engineering and maintenance; pressure vessels and piping; and heating, refrigeration, and air-conditioning systems.

Most common uses are generation of electricity and pumping water (especially agricultural pumping for irrigation).