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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 type of metal are bobby pins made of?
medium and high carbon steels may also be called spring steel
Fatigue limit which can also be known as an endurance limit or a breaking limit. A fatigue limit is a measure of the totalamount of stress a material can repeatedly withstandor tolerate before failing or breaking. All categories of materials have some kind of fatigue load limit. Materials are tested carefully to make sure that they meet standards for use in specialised products, anapproach that aids to prevent losses or damages arising from using materials that are unsuitablefor the construction of the finished product.
Let say you have a beam leaning on 4 rocks
= are beam
0 are rocks
. is the air
# are crate of peanut butter
This is a system with a continuous beam. The peanut butter crate will make the beam bends downwards between rocks 1 and 2 and the beam between rocks 2 and 3 will bend upwards because of the continuity
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What is microchannel heat exchangers?
A compact heat exchanger with a hydraulic diameter on the order of 1 mm or less. Flow is typically laminar and heat transfer coefficients are proportional to velocity.
Reasons of positive axial shift in steam turbine?
Sudden change of load
Sudden drop of vacuum
Sudden drop of Main steam temperature.
What is the definition for main engine cut off?
Main engine cut off or MECO is when a space shuttle reaches the orbit and the external tank is jettisoned and the all 3 SSME (Space Shuttle Main Engines) are turned off
What is the difference between a long rocket fin and a short rocket fin?
A longer fin has increased aerodynamic drag. The geometric relationship between the drag caused by the fins and the center of gravity of the rocket determine the stability of the rocket in flight. Less aerodynamic drag means the rocket can go higher or farther, but it also means the rocket is less stable in flight. This tradeoff has to be considered in the design of the rocket.
The pressure exerted by the pressure head of liquid steel in a container at bottom surface of the container is known as ferro static pressure.
Difference between bar and barg?
The 'g' added on to bar means 'gauge', as opposed to bara, meaning 'absolute'.
The 'zero' of a normal gauge is normally set at atmospheric pressure (things like tire pressure gauges, water gauges etc.) These gauges will read as "10 bar" but really mean that the absolute pressure is 10 bar + atmospheric pressure (~1.01325 bar).
Some gauges however are absolute gauges. These might include weather gauges, or gauges on closed processes.
bara = barg + atmospheric pressure
What is the working principle of orifice meter?
An obstruction (orifice) is placed in a pipe filled with fluid. The pressure of the fluid is measured at two different points: 1) just upstream of the orifice and, 2) close to the contraction of the fluid (vena contracta). The difference in these two pressures is known as differential pressure. The differential pressure across an obstruction (orifice) in a pipe of fluid is proportional to the square of the velocity of the fluid.
Many factors associated with the pipe, orifice and fluid affect the measurement. Satisfactory measurement requires steady-state, homogeneous, turbulent flowing fluids. Other properties which affect the measurement include: the ratio of pipe diameter to orifice diameter and the density, temperature, compressibility and viscosity of the fluid.
How can you tell the difference between a general and specific tolerance on a drawing?
IDK that is why i asked
General tolerance refers to all untoleranced dimensions, and should be covered by a note on the drawing, eg tolerance unless noted otherwise plus or minus 0.25 mm
Specific tolerance will be included with the individual dimension, either as dimension limits or dimension plus tolerance.
Why there is a isentropic expansion in a turbine?
La secuencia de eventos termodinámicos en un motor de combustión puede representarse y calcularse en un diagrama idealizado. Idealizado significa aquí que la compresión y expansión de los gases en el cilindro se considera isentrópica, es decir, sin aumento o pérdida de calor. En la práctica, naturalmente es necesario que los cilindros Sean enfriados para que se alcancen pequeños valores máximos de presión y temperatura.
How much money does a draughtsman earn in the UK?
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What is the diesel fuel consumption as a function of engine power output?
As a rough rule of thumb, you can assume you will burn one third of a liter of fuel per kilowatt-hour generated. With a reasonable degree of instrumentation on a battery of 600kw diesel generators, we measured fuel flow vs power generated, and got a factor of .287 liters per kilowatt hour. These were relatively new generators powering a fairly level load. If the engines are smaller, if the load fluctuates, if the engines have high operating hours, the factor will increase.
Tool used for cutting internal threads in a hole?
The tool for cutting internal threads is called a tap. A tool for cutting external threads is called a die.
There are dfferent types of cooling towers available in Industry.
Some of the commonly is used cooling towers are
- Round Cooling Towers
- Square Cooling Towers
- Dry Cooling Tower
- Wooden Cooling Tower
- Cross Flow Cooling Tower
- Modular Cooling Towers
- Evaporative Cooling Towers
- Natural Cooling Towers
- Counter Flow Cooling Towers
Get a highly durable cooling tower according to your industry.
What is the relation between absolute and gauge pressure?
Guage pressure is the pressure in excess of the atmospheric pressure, which is around 15 psi. Absoute pressure is the pressure relative to a vacuum. Guage pressure can be negative if you are measuring pressure in a container which has been evacuated. Absolute pressure is always positive. The different systems came about because guage pressure is easier to measure, and is often the relevant property for the task at hand anyway. As an example, consider a car tire. When measured with a common tire guage, which reads guage pressure because it is balancing forces with the atmosphere on one side, the pressure in the tire is 35 psi. Put the car in orbit in space, and the guage would be reading absolute pressure. It would read 50 psi.
How do you calculate how hot a wire can get?
Determine what the wire is made of and look up the melting point of that metal. Once it reaches that temperature it will not be wire anymore but molten metal.
Pass design for channel section in rolling mill?
All depends on the channel size, 7 or 9 passes required to reduce from a rectangular or square starting section. The bar is almost completely enclosed by the top roll in a "closed pass" sequence of grooves and the thickness of the web and flanges is progressively reduced. A control or edging pass before the finishing pass regulates the final flange length, area reduction in the last pass is minimal to avoid excessive pass wear.
What is a function of deaerator?
deaerator is a device used to remove dissolved oxygen and carbondi oxide in boiler feed water. it causes scaling inside the boiler tubes and economizer also.
