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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

How does a heat exchanger work in a gas furnace?

shell is the place where hot utilities comes across meets with the tubes which is cold utilities, in order to transfer heat. the area of the heat being transfer depends on how many/much the area of tubes being exposed to the shell hot utilities. the greater the area of tubes being exposed, more heat being transfer. hence, less energy needed in order to heat a big amount of cold utilities. decreasing of the temperature from hot utilities which pass over the tubes, next will be recycled back with others hot utilities/sources of heat.

Metric unit of young's modulus?

Young's modulus is defined as the ration of stress to strain for a given material below the limit of proportionality (the elastic limit). So Young's modulus is calculated by the formula: Stress/Strain is equal to young's modulus. Stress is defined as the force per unit area of cross-section below the limit of proportionality. So the formula is: Force (in newtons)/ Cross sectional area (in square metres). This would give the units Newtons per square metre which is written Nm-2 which is exactly the same as the Pascal (Pa); either can be used. Strain is defined as the fractional change in length produced when a body is subjected to stress. It's formula is: Change in length produced (in metres)/ Original legth (in metres). There are no units as it is a ratio of two values that have the same unit. So Young's Modulus has the formula: (Force/area)/(change in length/original length). This can be simplified to Stress/Strain (the amount of stress a body has to undergo to produce a certain amount of strain. The unit for stress is the Pascal (Pa) and there are no units for strain so overall, the unit for Young's Modulus is the Pascal (Pa) or Nm-2.

What thickness of steel will stop the penetration of a 7.62mm short round?

There is no standard thickness. Different steels have different properties as do bullets

Can you scratch cast iron?

You can paint about anything. Depending on the temperature the iron is getting will say what type of paint you need. (there is special paint for engines) if the iron is going to get extremely hot, you might not find a sutable paint.

What is the deformation between strain and deformation?

First of all i guess the right question is difference between strain and deformation. Actually the strain is deformation in a material over its original length. So strain is a relative quantity while deformation is simply change in length, hence absolute and is new length minus original length.

Strain= deformation(L2-L1)/original length(L1)

What two types of systems are designed built and maintained by mechanical engineers?

Mechanical engineers design, build, and maintain a variety of systems, primarily focusing on thermal systems and mechanical systems. Thermal systems include heating, ventilation, and air conditioning (HVAC) systems, as well as engines and refrigeration units. Mechanical systems encompass machinery, robotics, and manufacturing equipment. Both types of systems are crucial for industrial processes, energy efficiency, and overall functionality in various applications.

How much does a marine technician make in a month?

A marine technician that works for marine dealerships earn an average of about $35,960 a year, so about $2,299,67 a month. Marine technicians that work in the ship and boat building earned about $40,550 a year, about $3,379.20 a month. Those work on coastal states (Alaska, Massachusetts, New Jersey, California, Connecticut, Maryland, etc.) usually earn more than others that don't.

Does aluminum have a high density?

No, it is relatively low compared to steel; aluminumdensity is 2.7 g/cc (.098 lb per cu in) while steel is 3 times higher

How many years of college does it take to be an aerospace engineer?

A bachelor's degree in most areas can require between 124 to 128 college credits particular to a specific program of study. This would be based on a college or university that operates on a regular two semester academic year which is the most common. For institutions that operate on a tri-semester or quarter-semester it would be quite different. That being said, the Bachelor's degree - in most cases - is designed as a four year program of study, provided the student is full-time and follows their chosen program of study as prescribed by the college or university, and also provided the individual does not require prerequisite or developmental coursework as a result of basic skills testing. The minimum credit load for a full-time student is no less than 12 credits per semester. However, to complete the degree within the four years, a credit load of approximately 15 to 18 credits is recommended. For individuals who work or who have other responsibilities that would prohibit them from attending full-time, completion of the degree may take twice as long. Still, some of this time can be cut down by attending summer sessions and/or interim sessions. In addition, the bachelors and associate degrees are referred to as undergraduate degrees while the masters and doctorate degrees referred to as graduate degrees.

What is the OD of 4 inch schedule pipe?

Schedule 40 Pipe O.D. through 12" Size (inch) O.D. (inch)

------ ------------

3/4 1.050

1 1.315

1-1/4 1.660

1-1/2 1.900

2 2.375

2-1/2 2.875

3 3.500

4 4.500

5 5.563

6 6.625

8 8.625

10 10.750

12 12.750 Charts with the larger sizes are readily available online

How does Thermodynamics affect the work of mechanical engineers?

thermodynamics, is essential for mechanical engineers, because the subject is mainly about heat and work in system, and as an engineer that is important, especially when you have to design engines, because that is when you have to determine important factors such as the amount of work that can be done by that engine internally, and the heat it transefered and obtained.

What is the relatiionship between torque and speed in gear trains?

I'm guessing you're talking about a disc viscometer, in which case the higher the viscosity, the higher the measured torque.

What are some problems with a globe valve?

advantages of a globe valve

* you get instant access to the supply: only a 90 degree turn to open fully * less maintenance is required to the valve as you won't have to re-seat it disadvantage of a globe valve

* it is harder to finely adjust the flow of your substance compared to a gate valve: a gate valve requires many more turns to fully open and close than the single 90o "part-turn" required on a globe valve

What are the disadvantages of the GRP pipes?

First of all

frp full form is glass reinforce plastic and

grp full form is glass reinforce polyester

the difference between this two is,grp is one of the type of frp pipes

like other types are grv (glass reinforce venylester)and gre (glass reinforce epoxy) depends on type of resin(chemical) to be used to make frp pipe.

What is the Relation between sheet metal gauge and thickness?

Metal gauge is inversely proportional to thickness, the bigger the thickness lesser the gauge.

Following is conversion table:-

10 G : 3.15 MM

11 G : 2.8 MM

12 G : 2.5 MM etc....

What is a pitot tube used for?

A pitot tube is used to measure local velocity in a flowing fluid. The pitot tube

hole must face the flowing fluid. The local velocity, u , is given by :

u = SQRT [ ( delta P ) ( 2 ) ( g sub C ) / ( rho ) ]

What are the advantages and disadvantages of a compound gear train?

in general gear drive is useful for power transmission between two shafts which are near to each other ( at most at 1m distance)
also it has maximum efficiency while transmitting power
it is durable compare to to other such as belts, chain drives etc

You can change the power to speed ratio.

advantages:-
- It is used to get various speed in different load conditions.
- It increases fuel efficiency.
- Increases engine efficiency.
- Need less power input when operated manually.

The main purpose of gear drive is a conversion of speed into torque or vice verse.

Applications:

1) Sugar Industries

a) Shredder

b) Mill Crushing

c) Fabriser

2) Cement Industries:

a) Bucket elevator

b) Conveyor Drive

c) Ball mill

d) Vertical roller mill

e) Rotatory Kiln

3) Fertilizer Industries:

a) Agitator

b) Compressor

Etc......

By

Muhammad Asif

Executive Mechanical Engineer

Siemens Engineering Pakistan

Flender AG Germany

Why is it a disadvantage for hydraulic systems to have flexible tubes?

If the hoses ("tubes") expand, the pressure available at the working device will be lower, reducing the force available. Also, if the hoses are moving around because they are flexible, they are more likely to get worn or damaged.