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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 cold bend in pipeline?
Bending a pipe in a required radius of circle by without applying any external source of heat on the pipe is cold bend in pipeline.
What is the mean of separation in reciprocating pump?
If the pressure in the cylinder is below the vapour pressure , dissolved gasses
will be liberated from the liquid and cavitations will takes place . The continuous flow of liquid will not exit which means separation of liquid takes place. The pressure at which separation takes place is called separation pressure and head corresponding to the separation pressure is called separation pressure head.
Why lantern rings in gate valve are used?
Piping hand book decribes that a spacer ring used in the lantern ring type of packing chamer to permit lubrication of the packing, purging of the shaft or stem, or a leak-off system.
How come all bodies sliding down a frictionless inclined plane have same acceleration?
all bodies have same acceleration while coming down from an inclined plane because in such type of case acceleration does not depends upon mass....acceleration can be given as a=gsinθ......θ(theta) is the angle of the inclined plane. g is the acceleration due to gravity or 9.81 m/s2.
*Note: the acceleration due to gravity is actually based on the mass of both bodies and the square of the distance between their centers. While this means that gravity (acceleration) is not equal for all bodies, the mass of the Earth is so much greater than any measurable bodies, that can move down the inclined plane. The mass of the body is negligible in comparison and thus the change in acceleration due to gravity is likewise negligible, and generally not measurable. If a mass the size of the moon were moving down the inclined plane, then that would definitely indicate a greater acceleration.
F = m1m2/r2. Where F = force of gravity, m1 = mass of body 1, m2 = mass of body 2, and r = the distance between the bodies.
What is undercutting of gears?
Undercutting of gears, is machining a matched set of dogs/slots that grip into each other - so that they will grip harder the more torque the engine is providing. This will prevent the gears from slipping out again after initially having them engaged. An easy setup, is to fix the gear with its axis center offset in an indexing head - sligthly tipped over(3 to 5 degrees - depending on how much material that can be removed, or how badly the dogs are worn), so that the actual dog to be machined spins precisely around its own vertical axis when table is turned. The finished dog, will have a uniform shape all the way around its contact areafacing the slots/dogs of the interacting gear next to it.
Usually done in a vertical mill, by grinding - or with a dovetail milling bit. Using a dove tail milling bit, will let the machinist fix the gear in a horizontal position, rather than having to tilt it the neccessary amount of degrees. Dogs, slots - or teeth, need to be hardened again, if they are ground beyond the limit of the previous hardened surface of the material.
What is the formula to calculate heat energy if resistance known?
J (Joules) = Kg (Mass) x Specific Heat (Sometimes C, which is calories, but most times specific heat which is q) x Delta T (Change in temperature).
J = m*q*▲T
Is flexural modulus the same as bending stiffness?
It is related. Flexural modulus is the modulus of elasticity (E) in bending and the higher it is the higher the bending stiffness. Technically, bending stiffness is the product of the flexural modulus and the material bending moment of inertia, I, that is EI.
it means disassembling of various parts of the pump assembly to determine the damage parts and to replace it, depends on the degree of damage, minor or major overhauling may be needed.
What is axial or longitudinal stress?
Axial Stress: A tension or compression stress created in a structural member by the application of a lengthwise axial load.
Definition Copyright ©1989 CRC Press LLC. All rights reserved.
Examples of tensile axial stress include a chain carrying a load and tension cables on a bridge. Examples of compressive axial stress include decorative columns in architecture and the steel structure of a high rise building.
Read more: What_is_axial_stress
Longitudinal Stress: In continum mechanics, stress is a measure of the average force per unit area of a surface within a deformable body on which internal forces
How does the caterpillar engine work?
Same as a regular car engine but to give it the extra power it has some more cylinders
What is the purpose of vortex breaker and how it will help?
Vortex breaker prevents circular flow, this circular flow is known as vortex. Vortex breaker used in storage vessels, knockout drum, etc
Which engineering is the father of all engineering?
There is not really one. Engineering itself is the overarching title, but there are different types, such as civil, mechanical, etc.
Why IP turbine rolling is done but not HP rolling?
Turbine maintain very good thrust force balance in IP rolling and high pressure and temp is not required in this.
Why is to safety valve mounted on boiler drum?
the safety valve is mounted on the top of drum because, if the water level in boiler decreases a certain value, the temperature gets increased in water drum because of lack of water. So, increase in temperature result in high pressure in steam drum, as the safety valve is designed to withstand a certain pressure, after a cetain pressure, the safety valve is removed by high pressure of steam. this is why the safety valve is mounted on top of boiler drum.
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Shall we sort out that lot? That answer is wrong. Its only link with water-level is that the valve has to be above the water anyway. If the boiler runs dry the safety-valve will not protect it.
The safety-valve is there to prevent the steam pressure rising to a potentially a dangerous level. It is set to open at the boiler's designed working pressure.
A gear pump is taken into utilization for meshing of gears to pump fluid by displacement. Being the most common types of pumps for hydraulic fluid power applications, these advanced pumps are used in chemical installations to pump high viscosity fluids.
Among some of the top Gear Pump Supplier, name of Terrekosen-Hydraulic comes on the top. A team of dedicated professionals has been working here, who have proven track record and years of experience.
What is the DIN equivalent of ASTM A615?
ASTM A615 is the Standard Specification for Deformed and Plain Carbon-Steel Bars, the equivalent in German standards are DIN 17100 & DIN 488.
Why water filter is provided at water inlet of water cooler?
So that the internals of the cooler don't get gunked up by precipitates that come out of suspension when the water is chilled. Solubles will still precipitate out.
A36 is paramagnetic. It is fairly good conductor of magnetic field, and it will be atracted to magnets strongly. As far as residual magnetism (can it be magnetized) I don't know for sure. I know you can not make usefully strong magnets out of A36 material, but it may have some residual magnetism.
