Mechanical Engineering

cavitation usually, or a thrown blade on the impeller.

150 MPa yield is equivalent to approximately 21,755 PSI. This means that a material with a yield strength of 150 MPa can withstand the same amount of stress as a material with a yield strength of 21,755 PSI before plastic deformation.

What is the defferec between Carbon steel pipe and Mild steel pipe?

Syed Hamad Ur Rehman

Project Director

Hatah (Pvt) Ltd

hamad@hatch.com.pk

www.hatch.com.pk

Step 1: you call someone to do it for you

Many larger saws and similar machinery have control boxes on the front to operate them . Most of these have a prominent red STOP button.

weldng s d procecess joning f 2 simillar metals usually.

1st u study about metals nd ther heating r melting temp. nd knowing abt which type metals we use.

nd study about electrodes ie most important nd welly study about diffrnt types f electrodes

nd diffrnt types f welding. they r so many type s dr ie depends upon metals, wtever welding placess nd so must be needed.

study abt flux.

study abt power mean current which type nd hw much pwr s need fr particular welding.

mainthing s saftey nd precasution

Not a hydrologist, but I'd lay money on the fact that steam is mostly air, and ice is mostly water.

The unit of measure of electrical pressure is the VOLTS.

it is the response of a system with respect to the input as a function of time

Fracture stress is only less than ultimate tensile strength in an engineering stress-strain diagram. This is because the material will experience a maximum stress before it undergoes necking. After necking, stress will decrease again until the material snaps.

one reason air is much harder to control the heat and air has a lot of water in it and a hydraulic system dose not need water in the hydraulic oil. There is no way at the high pressure that a hydraulic system has to work at,it would not be possible to control the heat.

The most common welding hazards are, burns, electrical shock, inhalation of harmful fumes, and UV damage to skin and eyes. All can be easily avoided if proper safety precautions are implemented.

An Oldham coupling is a flexible shaft coupling that consists of two hubs (each with a fin or tenon) and one midsection (with grooves that fit those fins, one on each side of the midsection, and perpendicular to one another).

The Oldham coupling is an outstanding design for torque transmission between two shafts which might be slightly misaligned. The coupling accommodates this misalignment, while maintaining homokinetic motion (the two shafts rotate at the same speed at all times), and while exerting only very small reactive forces (resistance to accommodation of the misalignment, exhibited as sideward forces on the shafts).

More information on Oldham couplings can be found at www.oepcouplings.com.

Vulcanization is a chemical process (invented by Charles Goodyear in 1839, patented in 1844), which combined with heat and sulphur, causes polymeric molecules form atomic "bridges" of sulphur or carbon-carbon bonds with other molecules. The once loose, polymer chains are now constrained in mobility due to the chemical cross-linking between polymer chains. This cross-linking is what gives polymers their distinctive properties.

heating ventilating and air conditioning.Type your answer here...

Porosity is caused by molten puddle problems: oil, dirt, etc near weld, lack of shielding gas (tank is empty, or wind is blowing away gas. local vaccums for ventilation also can cause gas problems.) If mig welding, if you don't balance wire speed to amps, you may see porosity. Lastly, long arc'ing (too much distance from end of mig wire, to material) can cause bubbling.

some items are : cutlery, pens, file cabinets etc...

just think about everyday things :)

Workshop curricula build the hands on experiences which would help to learn manufacturing processes and production technology courses in successive semesters. Workshop practice is also important since only practice can make the man perfect.

Um, there isn't one.

If there were a "standard" then all aircraft would be pretty much the same. And they aren't.

It depends on the design mission (think wide-body passenger aircraft versus the F-104 Starfighter for example), and a number of other considerations.

Load is in the center, as in a wheel barrow or a bottle opener.

Having an acronym might help remember which class is which. For example:

3-2-1 - ELF! means that for a class 3, the effort is in the middle; class 2, load in the middle; and class 1, fulcrum in the middle.

A riveted joint with single rivet and a bolted connection with single bolt are perfect pin-joints. When number of rivets/ bolts along the axis of member increases, the degree of restriction to rotation gradually increases and becomes a rigid joint, which prevents rotation by offering moment reaction.

NB = inside diameter of the tube.

OD = outside diameter of the tube.