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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 makes the fluid flow in a pressurized system?
a difference in pressure (differential pressure). For example putting air in a tire (I know its pneumatics and not hydraulics but it is the same concepts.) the air tank is holding 110 lbs of pressure and when you connect the hose to a tire with 25 lbs the air is going to flow from the tank to the tire. or from high pressure to low pressure.
What does hot rolled and cold worked mean?
hot rolled is a process in which iron alloy heated above recrystallisation temperature to induce desired mechanical , electrical properties like hardness ,toughness , tensile strength, etc..,some hot rolled process are.extruding.,annealing
H7 tolerance refers to a specific grade of dimensional tolerance used in engineering and manufacturing to define the allowable variation in size for cylindrical features, such as holes or shafts. It indicates a tolerance zone that is generally suitable for producing parts that fit together without excessive play or interference. The "H" denotes that the tolerance is applied to a hole, while the "7" specifies the precision level, with lower numbers indicating tighter tolerances. This system is part of the ISO tolerance framework, helping ensure parts are manufactured with consistent precision for proper assembly and function.
That is the handles, screws, face plate and everything except the rough in valve. The rough in is the main body of the valve that is installed in the wall before drywalling or putting the tub/shower in. The trim is put on after the walls are finished.
Why you need to find stress in steel?
stress on steel need to be calculated because elastic limit is not be exceeded basically we have to work within the elastic region in a stress cycle diagram.
Why sulphur and carbon tests are done?
These tests are performed to determine the carbon-sulfur content of some metals. Certain metals comply to a specific standard due to the levels of its carbon-sulfur content.
What is the different between butt fusion machine and electrofusion machine?
butt fusion machine:
Application:
Suitable for plastic pipes and fittins made of PE,PP, and PVDF in construction site or workshop.
Features:
1. consists of basic frame, heating plate, planing tool, and support (for planing tool & heatingplate)
2. Removable PTFE coated heating plate with separate temperature control system.
3. Electric milling cutter with reversible double cutting edge blades.
4. Low starting pressure ensures reliable welding quality of small pipes.
5. It is made of lightweight and high strength material; lightweight,simple structure and easy tooperate.
Electrofusion machine:
Product details:
Application and Functions:
1, Suitable for welding electrofusion fittings
2, Printer/bar code scanner can be inserted at any time, automatic identification.
3, It has automatic voltage regulation to protect over-voltage.
4, It has automatic thermo-compensation, fusion welding is not influenced by ambient temperature.
5, Computer menu display is easy to operate.
6, It can store and print state parameters of welding procedure (single or all) for system diagnosis.
They can transfer forces and bring about changes in the direction of forces
What is refrigeration capacity?
As i found: A measure of the effective cooling capacity of a refrigerator, expressed in Btu per hour ot in tons, where one ton of capacity is equal to the heat required to melt 2000 pounds of ice in 24 hours or 12000 Btu per hour.
What is the best way to keep something warm in the ice chest?
Take it out of the ice chest.
A plastic insulated cooler can be used to keep things warm. Warm the cooler by running hot water into it. Empty the water after a couple of minutes. Wrap the item you want to keep warm in newspapers or towels and place it into the cooler. You can also use something that can be warmed, such as the combination ice/hot packs, to pack with the item in the cooler and it will help it stay warm longer.
Why saturated steam is used in exchangers frequently rather then superheated?
The heat transfer coefficient of superheated steam is poor. Saturated steam has a better heat transfer coefficient, and also most of the heat transferred from steam occurs because of the condensation phase change.
Is Chebyshev linkage an inversion of four bar linkage?
Well, yes: but that isn't very interesting. The Chebyshev linkage does have four bars, and by definition, every four bar linkage has four inversions.
An 'inversion' of a linkage just means you're holding a specific bar still, or in kinematic terms, you're using that link as the 'ground link'. If a linkage has arms A, B, C, and D, the first inversion uses A as the ground link, the second inversion uses B as the ground link, the third inversion uses C as the ground link, and the fourth inversion uses D as the ground link.
Inversions matter because of the 'coupler' link, which is the one opposite the ground link. Take the first inversion of A, B, C, D above: A is the ground link, so it doesn't move relative to the ground. B and D connect to A, so both of them have one end that doesn't move relative to the ground. The other ends of B and D move in circular arcs relative to the ground (they're lines of constant length, with one end fixed relative to the ground.. in other words, a compass). Link C is the coupler for this inversion, because it's connected to the moving ends of both B and D. It moves in and interesting way relative to the ground.
For each inversion, a different link is the coupler, and the motion of the coupler relative to the ground tends to be VERY different from one inversion to the next. The motion of any given point on the coupler relative to ground is a sixth-order curve (meaning it start with x to the 6th power and works down from there), and people are still doing hard work on the math.
The Chebyshev linkage is interesting because the center of the coupler moves in almost exactly a straight line. It wobbles a little, but the wobble is small enough that they could ignore it when making parts for steam engines that needed to move in a straight line.
An interesting side effect of coupler curves being sixth-order functions is that there are three completely different linkages whose couplers will move the same way. Chebyshev was one of the people who did the math to prove that. The three linkages whose couplers move the same way are called 'cognates' of each other.
The Chebyshev linkage is symmetric, so both of its cognates look the same. They're called the 'Hoekens' linkage, after the guy who did that bit of math.
What does high flow rate valve cf8m 1000 cwp mean?
cf8m is a Sharpe Valve model # , 1000 CWP means it is rated for 1000psi Constant Working Pressure
What are the types of hydraulic actuator?
tie rod cylinders
rotary actuators
grippers
rodless actuators w/ magnetic linkage or rotary cylinders
rodless actuator w/ mechanical linkage
it was invented by a man called Justin Andrews .
valva lag- inlet valve closes after B.D.C
-exhaust valve closes after T.D.C
