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
What is the maximum value of Poisson's ratio in strength of materials?
Poisson ratio of most linear elastic material can be anywhere between 0 and 0.5.
The difference between speed and velocity?
Speed is a scalar quantity and thus a general term; if a car is traveling at 60 mph that is its speed;
Velocity is a vector quantity that has speed and direction associated with it. If a car is traveling at 60 mph due east that is its velocity.
The two terms are often used interchangeably.
What polarity is used for mild steel GTAW?
The only way to tig is to have your ground clamp hooked to the positive side of the welding machine. The negative lead will go to the tig torch. If it is reversed you will find out very quickly when you strike an arc. Most metals will be welded using this Polarity (straight). Most Aluminum TIG welding is performed using A C current.
What are the practical applications of Fluid Mechanics?
Applications of fluids could mean many different things. In medicine, this could refer to an intravenous infusion of saline. In the automotive world, this phrase could be used in reference to oil, gasoline, and other fluids used to maintain an engine.
What is an important property of liquids that make them useful in hydraulic machines?
a solid would simply generates friction much higher than liquids
What is the Difference between plasma welding and gas welding?
The difference between a gas and a plasma is the chemical properties. Plasmas collect electric currents and electric and magnetic fields affect plasmas
How do you remove rust from high carbon steel?
probally if not to bad rusted with a wire brush if really bad rusted use a wire brush hand grinder wheel that is what helps me in when i have to weld rusty metal
How do you convert meters per second to RPM's?
You need more information to specify exactly what you are trying to do here, but I can give you one common example that will hopefully get you on the right track.
If you take the example of a cylinder spinning about it's axis, then you can convert between its rotational speed in revolutions per minute (RPM) and the tangential surface velocity (m/s) if you know the diameter of the cylinder. Essentially, you divide the time of one rotation into the circumference of the cylinder.
Legend:
V = tangential surface velocity
C = circumference of cylinder
D = diameter of cylinder
RPM = revolutions per minute
Pi = 3.14
Equations:
V = C * RPM = Pi * D * RPM
or
RPM = V / (Pi * D)
Example:
A cylinder with a diameter of 1 meter is rotating at 60 rpm. Its tangential surface velocity is:
V = (3.14) * (1 m) * (60 rpm) = 188.4 m/min = 3.14 m/s.
How do the propellers on a plane help the plane to fly?
It can spin either way.
The way in which it spins determines the direction it pulls the object it is attached to.
if it the propeller spins clockwise it pushes air backwards causing forward thrust, and if the propeller spins anti-clockwise it pushes air forward creating reverse thrust.
.
additional The above applies to an individual prop. However, for example, Spitfire aeroplanes were made with both clockwise and counterclockwise rotating props.
Which is by and large OK, but just as you leave the ground, the prop exerts some torque on the plane body, and this is countered by the application of other control surfaces. Such as flaps and rudder.
But before you apply the corrective measure, you better be sure you are doing it the right way. This problem has caused accidents.
What is stronger concrete or cement?
Concrete is stronger than cement.It is composed of aggregates (sand and gravel) and cement; and may be cast with reinforcing bar within it (reinforced concrete). Cement is only a part of concrete. Cement has no tensile strength while concrete has compressive and tensile strength.
What is the reason for overheating in transformer?
The main reason that a transformer overheats is too much current for the transformer design. So my guess is that you have more load than the transformer was designed for. So my answer would be not powerful enough.
You are not actually worried about the "power" of the device. You could use a 15 amp power supply on a device that needed a .015 amp load.
What you are REALLY waning to make sure of is that the desired voltage is matched. A 12 volt D.C. supply should only be used with systems that need 12 volts D.C. To use anything else causes issues. Too low of a voltage gives you brown out issues and too high of a voltage could cause you to draw so much current you burn the device up.
How is porosity caused in welding?
Hi
porosity is the gas pores (or) gas pocket travel deep in the solidified weld bead.
Major causes
$ Inadequate shielding gas
$ Poor welding technique
$ Damaged welding accessories
$ Natural effects like wind flow
What is parallel turning on lathe machine?
Parallel strips, which are hardened and ground steel pieces sold in matching pairs, are used in a vice or bolted to the machine table to support and accurately set jobs. Their purpose is to provide clearance so drilling and tapping operations can be done without cutting into the machine table.
Parts and functions of a shaper machine?
Parts:-
1. Ram
2. Position adjusting lever
3. Ram lock lever
4. Tool slider
5. Tool holder
6. Clapper box
7. Machine wise
8. Table
9. Saddle
10. Clutch
11. Table feed control lever
12. Length adjusting lever
13. Automatic lever
14. Manual lever
15. Ram speed lever
16. Base
F Function:-
shaping, chamfering, grooving, threading etc
How do you calculate points for a tensile strength versus composition graph?
"Ultimate Tensile strength", is measured as the number of Kilogram of force needed to fracture a 'unit' of Area of the material.
If you choose to use the Units of Kg for the force , and the Unit of Square Cm for the area; then the answer will be in Kilogram per Square Centimetre. You will now realise that it is NOT practical to measure tensile strength of paper because paper is extremely thin and it is not possible to make a piece of paper with an area of 1cmX 1 cm. Paper is usually about one twentieth of a mm thick. However, it you cut a strip of paper exactly 1 cm wide, from a telephone book with the pages clamped very tightly together between 2 strips of wood, and the stack of strips were exactly 1 cm thick; then you would have an area of SOLID paper which would be 1 cm X 1 cm. Now hang weights on it until it breaks apart. The Tension you created on the 1 square cm would be your answer.
Different types and qualities of paper will give very different results. In the same way , different types of steel have very different Tensile Strengths. Talk to an Engineer and he will explain the different between 'Ultimate' tensile strength, and 'Safe Working' tensile strength. Steel is an Elastic substance just like rubber, but it Ultimately stops stretching and breaks when its Ultimate tensile strength is reached.
Is a crane a class 1 lever or a class 2 lever or a class 3 lever?
A crane is a first class lever when it is winching in or out the rope attached to a load.
The crane becomes 3rd class lever when it's boom is luffing, i.e. it is being lowererd or raised.
The thickness of 24 gauge steel is 0.0250 inches or 0.635 mm (USG).
What is the difference brtween vertical milling machine and horizontal milling machine?
A "horizontal maching center" has a horizontal spindle. With a horizontal spindle, tools stick out the side of the tool holder and cut across the side of a part (workpiece). Horizontal machining centers are far more expensive than equivalent capacity vertical machines, but have several advantages. Usually the tool holder of a horizontal machine is more ridgid. Also,when machining the side of a part, metal chips fall out of the area being cut, leaving an uncluttered cutting area.
A "vertical machining center" has a vertical spindle. With a vertical spindle, tools stick straight down from the tool holder, and often cut across the top of a part. One disadvantage of vertical machining is that when tools cut across the top of a part, the metal shavings, called "chips," often pile up around the tool and interfere with the cutting action. However, vertical machining centers are more common, primarily because they are less expensive than equivalent capacity horizontal machines.
How do you increase the viscosity index of kerosene oil?
Heat it up a little to evaporate the volatile burning elements
