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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

Why gas turbine is trip on excitation failure?

The excitation system puts the load on the generator, so if it fails, the generator is liable to overspeed.

Think of it as the gears on a bicycle, where your legs are the power source, the gearing is the excitation system. If you're riding along, and suddenly your gears fall off, your legs will start to move very fast. You might hyper extend your knee, your foot might slip off the medal, you could hurt yourself in a bunch of different ways because you expect the resistance to be there and it is suddenly gone. The same applies to a generator - it's designed to run at specific speeds. Going significantly faster can cause all kinds of problems.

How do set the lifting pressure of boiler safety valve?

The lifting pressure is set by turning the adjusting nut on top of the valve.

What is high speed machining?

It is the process of using high speed spindle rates and lighter passes to achieve rapid material removal.

Can bulk modulus be used to find the stress-strain relationship of a material compressed in a single axis?

Yes, if the material is very thin in ther axis of compression. If it is not thin, as in compressing a long cyclinder, you do not need to know bulk modulus.

If very thin it won't make a lot of difference if it a metal with usual poisson ratio of about 0.25, but will make difference for possion ratio higher, especially approaching 0.5, as in rubber.

In the case of the long cyclinder stress = modulus xstrain

In the case of the thin material stress = modulus x strain times the quantity

(1-u)/ ((1+u)(1-2u)) where u = poisson ratio; the relation to bulk modulus for u is

u =1/2 - E/6B where B = bulk modulus and E = elastic modulus

When the efficiency of wet cooling tower is lower than dry cooling tower?

1. In wet cooling tower Two phase flow heat trasfer 2. To remove sensible heat from water is very critical 3.It depends on water droplet size ,fills design,orientastion and climatical condition. But in dry cooling tower, Air is the only media to remove the heat from the source 1. In wet cooling tower Two phase flow heat trasfer 2. To remove sensible heat from water is very critical 3.It depends on water droplet size ,fills design,orientastion and climatical condition. But in dry cooling tower, Air is the only media to remove the heat from the source 1. In wet cooling tower Two phase flow heat trasfer 2. To remove sensible heat from water is very critical 3.It depends on water droplet size ,fills design,orientastion and climatical condition. But in dry cooling tower, Air is the only media to remove the heat from the source 1. In wet cooling tower Two phase flow heat trasfer 2. To remove sensible heat from water is very critical 3.It depends on water droplet size ,fills design,orientastion and climatical condition. But in dry cooling tower, Air is the only media to remove the heat from the source

How to calculate capacity utilisation on a truck?

Subtract the estimated weight of fuel and passangers from the vehicle's rating.

List four applications of bernoulli's principle?

Bernoulli's principle helps explain how plains fly. It also helps explain why smoke rises up in a chimney, how an atomizer works, and how a flying disc glides through air.

Can you give us details of you current employment status?

You do not have to give out this information. You can just tell them about your current role at the business.

Results of Engineering Knowledge Test of Indian Airforce Held in 2009?

The result of Engineering Knowledge Test of Indian Air Force will be displayed on the website of Air Force i.e. www.careerairforce.nic.in, and click on written exam results, the results will be displayed in pdf format. To get your result status you have to get your roll numbers handy

Looking for the composition of electrolytic tough pitch copper?

ETP

is 99.5%+ pure copper that is very low in oxygen content it is the most common wire used for transformers Silver content in the wire is consider copper for purity analysis

What the importance of drilling center and guided drilling?

Drilling centre and guided drilling get your hole in precisely the correct place.

What is the difference between CRGO steel and normal steel?

CRGO stands for :COLD ROLLED GRAIN ORIENTATION which is used in transformer core assembly.Transformer problem occours 40% because of using Non prime CRGO as lndustries are using frequently so life of transformer reduces.

Both have different chemical composition like amount of silicon differs.

Rest of difference you can see through net like density diffrence and their chemical and mechanical properties.

Thanks

How does a car engine get power?

In a standard gasoline engine, power is initially only needed from the battery to kick the spark plugs, after that the alternator takes over- keeping the battery level up and powering your electrical systems.

Indian standard for pipe line color code?

what is the color code for all the pipeline used in standard hotel industry

What is the meaning of throughput in gas pipelines?

This term is an equivalent of capacity; expressed for example in cubic meters of gas to second.

Materials used to seal joints steam pipes?

it will be depend on the application, however following material are generaly used for pipe sealing -asbestos sheed - PTFE -composite sheet(Rubber+asbestos)

How do you turn the screw on a screw jack?

Usually with the tire iron/wheel wrench included with the jack. If that is missing, try a ratchet with a socket that fits. I've even used a screwdriver to twist it half-turn by half-turn.

What is the function of a receiver in a pneumatic plant?

The function of a receiver is a vessel to store the air, pressurised by the compressor.

To regulate that pressure.

To ensure the tools receive air at the correct pressure and at the required volume.

Can you still be a mechanical engineer even though you hate and suck at drafting and sketching?

Well, I have been one for 40 years and I also suck at drafting and sketches. But it does help to learn to read drawings. Also, to have a passion for engineering principles.

Do what you like and like what you do.