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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 SR pipe?

You get a sr pipe everytime you buy a chicken meal at rajas. Good for black people:)

Why steel is called rebar?

It's simply hardened steel that's been cast in long rods. It's used as reinforcing when pouring concrete to increase the strwength - especially in road construction or building foundations.

What is the role of an industrial engineer in facilities planning and design?

Industrial engineers can estimate the time taken and the process for manufacture. This will help you estimate the type and number of machines required to manufacture your product.

What is the average yearly salary for a bartender?

The yearly salary of a bartender can't be directly known because you must averagge in tips and salary together. [improved] That's true, but I've heard estimates of between 30,000 and 60,000 a year. My bartending teacher said he made 40,000 in the 1980's I believe it was 1985, when the IRS started to tax tips, as they found they were missing out on the higher percentage of a server/bartender income. So, these wages are discussed as little as possible, why is FICA taken from this income? It is not taken from AIG officers on their $1M+ bonuses, and that is the bulk of their income! And just what do they produce? A nicely polished desk seat! Most would say that bartenders avg anywhere from $20 to $100/hr, depending on where you work (city to city, bar to bar, a lot of variables). Good bartenders are personalities, not bottle whizs or concoction chemists (these skills can help, though)

Where does vibration occur most in a lathe machine?

Some major sources of lathe vibration are as follows: 1.) The stock you are turning is not centered properly, or has a lopsided mass. This has the same effect of to much clothes on one side of your wash machine during spin cycle. You can cure this by slowing down the speed you turn at until the roughed stock is more centered. 2.) Take a look at the head stock on your lathe, if it has worn bearings, if the pulleys are out of line or your belt is worn, you will most likely get vibration. 3.) Look at the floor your lathe is on. Is it solid? Cement is the best surface, an flex in your floor will result in lathe vibration. 4.) Look at the stand your lathe is on, is it solid, is it true. A level will let you know if youre base is sagging under the weight of your lathe. Make sure your lathe base is solid and not attached to surrounding walls. The common fixes:

Bring your head stock and tailstock together until they touch. Do they line up perfectly, if not you may have a lathe base or floor that is sagging under the weight. Spin the lathe by hand. Is it smooth? If its rough or bumpy chances are you have worn bearings that need to be replaced. Use a straight edge to make sure all belts and pulleys are in line. Being off center will cause vibration or can cause un-even wear of the belts which in turn will cause vibration. If the belt is worn replace it. Add some weight to your base. The lathe is heavy so any vibration is sent right through your base and magnified. Add weight makes it harder for the lathe to move around and will decrease vibration of an out of round piece of stock.

What is SMS fittings in dairy pipes and fittings?

SMS fittings are named from Swedish Dairy Standard ( Svensk MeieriStandard )

There are a multitude of variants in pipe-clips and clamps and couplings and unions that is commonly used all over Europe.

There are several other standards, DS (Danish Standard) and the Germans have several DIN standards such as DIN 11851 & 11887 and probably many others.

What is power-to-weight ratio of steam turbine and gas turbine?

there is a mathematical formula to figure the actual power measured in Inchpounds of torque for both types of turbine engines. due to the light weight of the engine and the very high speeds in which they operate they are very efficient compared to other type of power plants generally the rough power to weight ratio of a typical aircraft turbine engine is around 85 to 95% output power compared to the actual weight of the type engine used.the exception to this would be a turbo-fan engine used on high speed aircraft which the power output is measured in footpounds of thrust

What is footprint in construction?

A footprint, from a construction point of view, is the projected area on the ground or basement, upon witch the construction is to be placed. In other words it is the total consumed horizontal area of the vertical span of the object. An example of this Is the Eiffel Tower. The footprint of the Eiffel Tower is the total square under it, not just the four plates it stands on.

Importance of statistics to mechanical engineering?

1. Design of Experiments (DOE) uses statistical techniques to test and construct models of engineering components and systems.

2. Quality control and process control use statistics as a tool to manage conformance to specifications of manufacturing processes and their products.

3. Time and methods engineering uses statistics to study repetitive operations in manufacturing in order to set standards and find optimum (in some sense) manufacturing procedures.

4. Reliability engineering uses statistics to measures the ability of a system to perform for its intended function (and time) and has tools for improving performance.

5. Probabilistic design uses statistics in the use of probability in product and system design.

What are the types of sewage treatment plant?

There are basically two types of sewage treatment plants

1. Chemically treated - where chemicals are added to break down the effluents and disinfect it

2. Biologically treated - the effluent is broken down with the help of aerobic bacteria

Why is Vlo lower than Vle?

Vlo = Maximum landing gear operating speed (do not exceed this speed while the landing gear is operaing)

Vle = Maximum landing gear extended speed (do not exceed this speed while the landing gear is extended)

When the landing gear is fully retracted or fully extended it is locked into position and is more resistant to damage from high airspeeds. When the landing gear is in the process of extending or retracting (operating) there is no locking mechanism, and the only thing resisting the airflow is the extension/retraction mechanisms. Additionally, on some aircraft, the landing gear may swing or swivel in odd directions in order to tuck into their recesses, this can cause odd aerodynamic behavoir in the rest of the aircraft if done at high speeds.

Once the landing gear is extended, it is rare that a pilot would then exceed Vlo. Most of the time the landing gear is lowered shortly before landing and the pilot is doing everything he can to slow the aircraft further. However in the event that an aircraft had to be flown a long distance with the landing gear extended (such as a ferry flight to a repair facility) the pilot would go ahead & fly Vle.

Compare 1200btu ac with 18000 btu ac?

A 12000btu AC is considered 1 ton of cooling. 18000btu is 1.5 tons. One ton of AC will give you the cooling you would get by melting one ton of ice.

EPM

What is meant by tensile strength in of api grade x-70 steel?

Tensile Strength is 570 MPa (i.e. 82.7 ksi)

- (Ref. API 5L - Specification for line pipe - Forty Forth Edition Section 9.3.2- Table 6)

What is the difference between back pressure steam turbine and condensate steam turbine?

In a back pressure turbine all available energy from the inlet steam is NOT used to generate power; steam exhausts at a tangible pressure and is then used for, usually, heating or chemical processing. In a condensing turbine, all the inlet steam does mechanical work right down to the lowest pressureafter which it is condensed in a heat exchanger

What is design metal temperature for a tank?

It is the LODMAT, Lowest One Day Mean Ambient Temperature, (API 650, Figure 4.2) plus 15 degrees F. The LODMAT figure is a map of the USA and it has Isothermal lines on it indicating temperatures for different locations.

Is there a way to cut and re-thread a shower pipe that is already coming out of the wall?

You Can but typically the pipe for the shower head that is coming out of the wall is just a short piece of pipe that you should be able to remove easily enough by unscrewing it. Then you can just replace that piece with a new one. == Answer== Do the same as above but make sure your shower arm is not floppy, if it is you could tear up the riser coming to the arm. Be very carefull.

What does F.O.F. stand for in piping design?

Face Of Flange A flange has either of the two types of faces: 1. Raised face 2. Flat face The F.O.F is used to know the accurate dimension of the flange in order to avoid the minute errors in measurement in case of vertical or horzontal pipe lines
Face of Flange

What are the uses of footstep bearing?

A footstep bearing is essentially a cast-iron block with a gunmetal bush that has a hollow collar fitted on its top. This bearing is used to keep the shaft upright in a vertical position. The shaft is fixed in place and not allowed to rotate by a pin.

What is a CEW pipe?

A CEW pipe stands for a cold drawn electrically wielded pipe. Pipes can be made in a number of ways. One such method is to make pipes from sheet steel. The sheet is cut to the required width and rolled along the length. The ends are to be joined so that is forms a pipe. When they are welded using resistance then they are called ERW pipes and when they are electrically welded they are cold drawn electrically welded pipes or CEW pipes.

What is the meaning of the different symbols and abbreviations found on the drawing you use?

To individualise visual expressions of a particular specification or part within a drawing. Using the drawing key will help to differentiate between symbols.

The meaning of any given symbol or abbreviations in information documentation is to aid the user with regard to exacting specification, i.e.; Ω - means to measure or read in Ohms, Nm and Ibs may be used for weight in torque measurements, ISO metric, BSF, Whitworth, ANC, ANF, UNF, UNC are all nut and bolt thread types.