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.

21,908 Questions
Power Steering
Mechanical Engineering
DIY Projects

How is air being purged or recharged in telemotor of the steering gear?

Purge slowly into a pail or bucket in the telemotor hydraulic system purging valve until such a time pure hydraulic oil are coming out from the purging valve.

Mechanical Engineering
Periodic Table
Chemical Bonding
Acids and Bases

List of all nonferrous metals?

That would be all metals that aren't iron or iron alloys.

Yeah, like aluminium, zinc, copper, lead, beryllium, titanium, etc.

Mechanical Engineering
Desserts, Snacks, and Treats

Does Stainless Steel have a CAS Number?

However stainless steel and steel are not part of the European REACH directive (1907-2006-EC) there seem to be some examples of CAS numbers for stainless steel, however this looks more like a individual initiative from the supplier / producer.

Example: CAS 7439-89-6 ThyssenKrupp Stainless

Steel is not a chemical substansion as meant by REACH, but a product with several chemical elements. These elements do have a CAS number.

The Difference Between
Mechanical Engineering

What is the difference between a fence and a wall?

I would venture to say that a fence is either more temporary or constructed from materials, other than concrete stone or brick.

Mechanical Engineering
Combustion Engines

Is Youngs modulus the same as elastic modulus?


Mechanical Engineering
Machine Tools
Measuring Tools

What are the uses of footstep bearing?

It is fitted at the bottom of a vertical shaft for carrying the total load

Units of Measure
Civil Engineering
Mechanical Engineering

How many PSI in 2.8 bar g?

1 bar is 14.50377 PSI, so 2.8 bars is 40.610 PSI.

Mechanical Engineering

What is reverse bending?

When a cantilever beam is continuously loaded and released from mean position, in one direction only, it is called unidirectional bending, but when it is loaded alternately, first in one direction and then in the opposite direction from mean position, then it is called reversed bending.

Mechanical Engineering
Math and Arithmetic

Convert 38.5 celsius to Fahrenheit?

101.3 F

Mechanical Engineering

Why is the tensile test sample dumbbell shape?

The specimen's shape is usually defined by the standard or specification being utilized, e.g., ASTM E8 or D638. Its shape is important because you want to avoid having a break or fracture within the area being gripped. So, standards have been developed to specify the shape of the specimen to ensure the break will occur in the "gage length" (2 inches are frequently used) by reducing the cross sectional area or diameter of the specimen throughout the gage length. This has the effect of increasing the stress in the gage length since stress is inversely proportional to the cross sectional area under load, .

Mechanical Engineering
Space Shuttle

How does the space shuttle stand up?

It's bolted to the launch platform. 4 frangible (explosive) bolts which are detonated at the moment the solid rocket boosters are ignited, are on each of the 2 solid rocket boosters.. The strength of these bolts is shown by the fact that the orbiters 3 main engines, representing nearly 40 million horsepower, run for several seconds before the bolts are released.

The space shuttle, external fuel tank, and solid rocket boosters are mated in the Vehicle Assembly Building at the Kennedy Space Center into what NASA calls "the stack". This stack is mounted atop the mobile launch platform which is transported to the launch pad via the crawler-transporter.

The orbiter and solid rocket boosters are also connected to the external fuel tank via similar bolts that are detonated during the appropriate time during the ascent.

Mechanical Engineering

What is stagger angle?

The angle between chord line and turbine axial direction ( also known as setting angle)

Mechanical Engineering

What is steam turbine Turbine Stress Evaluator?

The Turbine Stress Evaluator (TSE) calculates and monitors the operational heat stresses of the turbine during every operational phase. The goal is to achieve continuous optimization between material stresses on the turbine and flexibility in reacting to operational changes.

Mechanical Engineering
Welding and Cutting

What is staggered welding?

STAGGERED INTERMITTENT FILLET WELDTwo lines of intermittent welding on a joint, such as a tee joint, wherein the fillet increments in one line are staggered with respect to those in the other line.Regards, Dineshraj.m

Mechanical Engineering
Length and Distance

Why the instrument is named Screw gauge?

The instrument is called a screw gauge, or more often a micrometer, because it uses a screw to amplify a very small movement so that it can easily be read. The heart of the screw gauge is a very accurately ground thread, usually of 0.5mm pitch, so that the axial movement of the screw corresponds to a much larger movement of a barrel which carries a scale. The instrument can be difficult to read because two readings have to be added, one measuring to 0.5mm the linear motion of the screw, and the other on the barrel giving the 1/100 ths. To some extent this instrument has been superseded by the electronic digital version, which does not incorporate a screw thread. A different gauge, called a thread gauge, comprises a set of metal blades with serrated edges which can be used to identify different screw threads by matching the right blade to the thread by trial and error.

Fuel and Engines
Mechanical Engineering

What is the maximum temperature produced in diesel engine during cycle?


Civil Engineering
Mechanical Engineering
Waves Vibrations and Oscillations

How would you describe vibration?

Vibration is the harmonic reaction of a structure to a force load.

Mechanical Engineering
Electrical Engineering

What is bleeding of steam in thermal power plant?

Bleeding of steam means Extracting steam from Turbines for heating the feed-water.

Normally, there are High Pressure Heaters & Low Pressure heaters in Condensate cycle. Steam bleed out from the turbine gets into these heaters and heats up the feed-water (generally termed as Sensible Heat Addition).

The steam that was bled can be re-used as condensate in Deaerators.

Steam Extractions although reduce net work output but helps in overall gain in efficiency in terms of Reduced Fuel Consumption.

Mechanical Engineering

Youngs modulus of steel in SI units?

Usually Young's modulus in SI is given in gigapascals (GPa) or megapascals MPa).

To go from psi to Mpa, multiply by 0.006895.

To go from psi to GPa multiply by 0.000006895

Units of Measure
Mechanical Engineering

What is the meaning of DN symbol in DN100?

DN is an acronym for Diameter Normal that refer to metric designations of pipes that conform to the International Standards Organisation (ISO). DN100 refers to a pipe with a Diameter Normal of 100 mm and a Nominal Pipe Size (NPS) of 4 inches.


Actually the N means nominal. Because the actual size of the pipe is nowhere what the nominal size is.

Mechanical Engineering
Steam Engines

What is honing of cylinder liners?

The honing equipment used has been manufactured by "Chris Marine". The head of the honing device consists of four synchronized stones. For the initial honing diamond stones are used to break up the hardened surface in the scuffed areas. For the main honing very coarse and hard stones are used to produce a very desirable rough surface all over the liner.

The advantage, especially for the 2-stroke engines, is possibility to save the liner after a seizure, scuffing or blow-by or even to eliminate the ovality of the liner. Another advantage is, that it is possible to machine a rough linerwall to obtain a well oiled surface.

Mechanical Engineering

What is IP30 Conformity?

An IP rating determines the level of ingress protectionthat the device is rated for. Ingress protection ratings determine how dust-resistant and water-resistant a given device is. An equivalent rating but is not likely to be common is a IK rating (which determines shock resistance)

For every IP rating there are two digits - the first one being dust resistance and the second for water resistance. If there's a X on either digit, this means that the tests for this particular characteristic haven't been performed, rated, or there's no resistance.

Most of the time you will see ratings like IP67 or IP68 - this means that (6) is dustproof and (7) or (8) is waterproof at somewhere around 3 to 5 feet underwater for up to about 30 minutes.

Mechanical Engineering

What is the other name for ASTM-A36 Hot Rolled Steel?


Mechanical Engineering
Civil Engineering

How many bar in 3000 psi?


Civil Engineering
Mechanical Engineering

Definition of mass in engineering mechanics?

Mass is the measurement of inertia, or resistance to change in motion. It is not to be confused with weight, a measurement of the force due to gravity exerted on an object.

For many practical purposes, mass and weight vary numerically by a constant, namely gravitational acceleration. Due to the common misconception of mass and weight being the same thing, units can often get confusing. For example, the English unit for mass is the slug, rather than the pound (a unit of weight). Some unit systems, such as the American Engineering System, take up the convention of making mass and weight numerically equal. In such a case, the units specify whether mass or weight is intended, so you would have pound mass (lbm) and pound weight (lbw). The SI unit for mass is the kilogram (kg), which, like the pound, is commonly and erroneously used as a unit of both mass and weight.


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