answersLogoWhite

0

📱

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

Axial clearance in feed pump of KSB HGC type?

Axial clearance is 0,02-0,03 mm .(I just get answer from KSB)

I like that you will contact me at horgdamir318@hotmail.com for more information

Define the material of grit in grit blasting?

The grit is chosen to be suitable for the job in hand. It must be hard/abrasive enough to remove whatever is contaminating the surface, but soft enough not to damage the surface underneath. At one extreme you might use corundum or silicon carbide, at the other, products such as ground cork or walnut shell are used.

What is the difference between the stress concentration factor and stress intensity factor?

The stress concentration factor is a number that raises stress locally due to factors such as holes and change in cross section. In the latter case, the sharper the radius at he cross section change, the higher the stress concentration. Typically, these factors range from 1 to 3 and sometimes more.

Stress intensity factor is a bit different; it is an inherent property of the material that is tested and defined for cracks or flaws. For cracks and flaws, the radius is very small, approaching zero for sharp corners, and stress concentration factors become very very high, approaching infinity. In this case we use the measured stress intensity factor and equations of fracture mechanics to calculate allowable stresses. It is often used for fatigue calculations for metals and for strength determination for brittle materials like glasses and ceramics.

Is jewelry a insulator?

Jewellery usually consists of eithe rmetal on its own, or precious or semi-preciou sstones set in metal. Such items would not be insulators. Jewellery such as beads on string, or manmade or wooden items would be insulators.

What are linear rotary oscillating and reciprocating movements?

Linear movement refers to motion along a straight path, while rotary movement involves circular motion around an axis. Oscillating movement is characterized by a back-and-forth motion, typically around a central point, like a pendulum. Reciprocating movement combines linear motion in opposite directions, such as the up-and-down motion of a piston in an engine.

What is the definition special purpose machine?

A machine specially designed for a particular use or function

How works condensing turbine?

A condensing turbine operates by expanding steam generated from boiling water, which drives the turbine blades to produce mechanical energy. As the steam exits the turbine, it enters a condenser where it is cooled and converted back into water, allowing for the recycling of the water back into the boiler. This process creates a vacuum that enhances the turbine's efficiency by maximizing the pressure drop across the turbine. The overall system contributes to the efficient conversion of thermal energy into mechanical energy and is commonly used in power plants.

Give you a example of tensile strength?

Take a piece of any material, say a steel rod, or a piece of timber dowel and you grip it at both ends and try to pull it until it breaks. When you do this, you are putting a tensile load on the material. It is said to be 'in tension'. If the material had a cross sectional AREA of say, 1 Square Inch, and the Tensile Load on it was say, 50,000 Pound,then the Tensile load would be 50,000 PSI (pound per square inch). If the material broke apart under that exact load, then we say it has a TENSILE STRENGTH of 50,000 lb/ square inch. Engineers measure tensile strength in either Pound/Squ.inch. OR Pascal. A Pascal (metric system) is Newton per Square Metre. Steel cables used on bridges have a Tensile Load on them at all times. Engineers calculate the cross sectional area of steel cable needed to be safe , and never break apart. Engineers need to know the Tensile Strength of Steel to be able to choose what size cable to use,so that it is quite SAFE and will not break when in Tension. They use safety factors such as 5 (typical) This means they calculate the cross sectional area of a cable which is going to be 5 times as strong as the Tensile Strength of the steel they are using. They then know that it will never break. The Tesile strength at which a material breaks is called its Ultimate Tensile Strength. Engineers never allow the tension in steel to exceed about 1/5th ofthe Ultimate tensile strength of the steel. Modern Steel bars used in steel structures, has an ultimate tensile strength of approx. 80,000 lb/Squ.inch

Is pine bullet proof?

It depends - logically - on the caliber of the bullet, and the thickness of the pine. A deer rifle bullet will penetrate a 2x4 with no difficulty, and may or may not penetrate a 4x4. A .22 will penetrate neither, a .50 machine gun bullet will penetrate an 8x8. Loosely speaking, I would not consider pine to be a bulletproof material.

What are the advantages of using a hollow shaft in a power transmission system over a solid shaft?

Most of the force in a shaft is carried by the outer layers of the shaft, and very. very little by the center. By using a hollow shaft you get almost the same turning strength for a lot less weight and material.

What is the difference between back pressure and absolute pressure in steam turbine?

Back pressure is the small amount of vacuum that is created when the used steam condenses from the turbine back into re-usable water.

What is vdi engine?

Variable direct injection system i believe .

Why is condensate polishing unit operated at high pressure in a high pressure thermal power plant?

Perhaps the designers did not think of the advantages of a low pressure CPU. The only add on is the booster pump required downstream of the CPU.

Advantages of LP CPU are aplenty, starting from feasibility of gel resins, affordable pre filtration and improved OBR.

Take a peep into the European and Japanese markerts.

What is thread depth?

It's the depth of the cut from the crest of the surface down to the base on a bolt or screw.

What is the shear stress in ss 316 mat?

Shear stress in SS 316 (a type of stainless steel) can vary based on the specific conditions of its application, such as the load applied and the geometry of the component. Typically, the shear strength of SS 316 is about 0.6 to 0.7 times its tensile strength, which is generally around 570 MPa (82,700 psi) for the material. Therefore, the shear stress can be calculated by applying the formula τ = F/A, where τ is the shear stress, F is the applied force, and A is the area over which the force is distributed. It's essential to consider factors like temperature and corrosion, as they can also affect the material's shear properties.

What happens to strain when stress is increased in a material?

It also increases. It increases linearly with stress in the elastic range, then increass more rapidly once the material is plastic ( yielded).

How to calculate Q first moment of inertia above and below the neutral axis?

-find the area(A) of the shape above the neutral axis (or above a particular point if given)

- locate the centroid (y')of the shape relative to the neutral axis(or above point) using

y' = ∑AiYi / ∑Ai

- first moment of area = A*y' (or y' + distance of given point from neutral axis)