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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
Which type of motor is used in lathe?
The type of motor used depends on the size of the lathe.
Small "hobby" lathes use small fractional (1/8, 1/4...) horsepower ac motors which run on household single-phase power.
The lathes which are used to produce crankshafts for huge marine diesel engines - or the rotor shafts of the massive alternators used to generate megawatts of electrical power - must use giant-sized motors, producing hundreds of horsepower.
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DC SHUNT MOTORS.
Three-phase electric motor.
What are some examples of pneumatic devices?
Yes there is. Pneumatic valve springs. They are metal bellows that have air in them. Their use is in replacing metal wire springs in a high-speed combustion engine. An example would be formula one engines.
Think of uniform as everything moving together.
For example, in uniform circular motion describes the motion of a body traversing a circular path at constant speed.
The distance of the body from the axis of rotation remains constant at all times.
If the motion was non-uniform the distance of the body from the axis of rotation would vary.
How much money does a mechanical engineer earn in the US in a month?
How much does anyone get paid? It varies a great deal depending on experience and the nature of the industry. Also, you need to look at the average hours worked per week and the nature of the job
In the U.K newly graduated Engineers can expect on average a starting salary of £18,000.
According to the web page below, Mechanical Engineer at an average of £35,623/annum is the 52nd best paid profession in the UK. (Taken from a survey of over 300 jobs)
http://www.thisismoney.co.uk/news/article.html?in_article_id=411942&in_page_id=2
How does the avr automatically maintain a constant voltage level in a generator?
The AVR (automatic voltage regulator) measures the generator voltage output and varies the field voltage (which varies the strength of the rotating magnetic field) to maintain a fixed output voltage.
Some generators excite (power) the AVR and field windings from the main stator, some provide a separate stator winding just for field excitation, and others provide a separate stator winding and rotating permanent magnets (called PMG) for field excitation.
The generators that do not have permanent magnets rely on residual magnetism for the initial voltage to start the system or may provide initial voltage from the engine's starting battery.
it runs without fluctuation i.r continuous flow......
What is the coefficient of thermal expansion of weathering resistance steel?
steel pipe expands at .0000067 per deg. per foot example a steel pipe 100 ft.long at 30F when heated to 80F will be EL=expansion length L1=original length t2-t1=temp change CE=coefficient of expansion L2=final length EL=100(80-30)x.0000067 100x50x.0000067=.0335 or 3/8" (approx.) L2=100ft. 3/8in.
Pipeline thermal expansion elongation of the formula:
Where: linear expansion coefficient of carbon steel 12X10-6 / ℃
△ L = (t1-t2) L
△ L- pipe thermal expansion elongation (m) - medium temperature (℃) linear expansion coefficient of carbon steel 12X10-6 / ℃ t1- pipeline running temperature (℃) t2- during pipeline installation, L- computing length (m) pipe section
△ L = a (t1-t2) L a-- linear expansion coefficient of carbon steel 12X10-6 / ℃
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What kind of stresses are produced in a beam during transverse vibration?
If you load it normal to the beam axis you get bending stresses ( tension and compression) and shear stresses.
If you load it along the axis you get axial stress ( tension or compression)
Is 18 gauge steel shelving heavry than 20 gauge steel shelving?
When referring to steel, the higher the gauge a steel is the thinner it will be. So 20 gauge steel is thinner than 18 gauge steel, which would suggest 18 gauge shelving is heavier than 20 gauge.
The maximum gauge is 30.
Why are pumps and valves are necessary in hydraulic systems?
The basic and most common functions of valves in a hydraulic system are to regulate the flow and pressure of liquids.
There are varieties of valves as per their functions such as:
Isolation valves, to open and close the system,
Flow control valves/Balancing valves, to co control the quantity of flowing liquid,
Pressure relief valve, to release the excess pressure from the system, etc.
Easy argument both ways. It all depends on the criteria you are using, and who the customer is.
Buses are certainly cheaper to use than driving a car for the individual, BUT:
- Not all locations are reachable by bus.
- They run according to a specific schedule, which means that you often waste time waiting for it.
- If you miss the bus you end up with lost time, expensive cabs, and general frustration.
- Buses (local, at least, and depending on the route) stop along the way fairly often and thus take much longer than a car.
Cars allow you to get to wherever you want and at whatever schedule, and they travel more quickly than buses. BUT:
- You have to pay for gas, insurance, parking.
- You have to handle periodic tune-ups and repairs
- You often may be driving a single person in a vehicle meant for 5, so it's extremely inefficient.
- They contribute to more pollution.
- You have to be paying attention when you drive and can't read, daydream or relax as you can on a bus.
What does the term drag mean in flight?
Drag is one of the four forces applicable to a flying aircraft: thrust, drag, lift and weight. Drag is the amount of resistance to forward motion caused by a solid body moving through a fluid (air is considered a fluid for the purpose of aerodynamics).
The easiest way to feel the effect of drag is to stick one's arm out a car window while it's moving. First do it palm-down (horizontal), and then palm-forward (vertical). The force, known as "drag", pushing the arm backward increases substantially when the palm is vertical. That force is the same effect that an aircraft in flight experiences due to the frontal area of its airframe forcing its way through the air.
The science of aerodynamics seeks to minimize the drag through streamlining and other design factors, since drag wastes fuel, but it is physically impossible to elimnate it.
How do you store direct current?
DC can be produced in a battery via a chemical reaction. Also solar panels can produce DC directly. If you have Alternating Current (AC) you can convert to DC using a full wave bridge and filtering output.
What is meaning of ring main unit?
A standard piece of switchgear in distribution systems comprising of switches for switching power cable rings and of switches in series with fuses for the protection of distrbution transformers. RMU: Ring Main Unit. RMU used for H.T.side. RMU is having
3no.s of switches(Circuit Breakers or Isolators or LBS), it
is used for two inputs with mechanical or electrical
interlock and one outgoing to the load. Either one input
with two outgoings. RMU used for redundancy feeder's
purpose.
Ring main unit is used in a secondary distribution system. It is basically used for an uninterrupted power supply. Alongside, it also protects your secondary side transformer from the occasional transient currents. Depending on your applications and loading conditons you can use a swicth fuse combination or a circuit breaker to protect the transformer. This transformer connected to the switch fuse/ circuit breaker is called your T off. In a common arrangement you have Load break swicthes on both the sides of your T off. Ring main Units come in standard ratings of
11/22/33 kV, 630/1250 A, 21 KA/3 secs.
Why two stroke engine not used in aircrafts?
In the two stroke petrol engine as you know suction,compression,ignition,expansion and exhaust is completed in only two stroke and one revolution of crank wheel
more over diesel ignites at very high pressure which is not the same in case of petrol........if petrol is also ignited under pressure it explodes producing a big thumping sound.called KNOCKINGthis may reduce the power output and also lead to breakdown of the engine.
For the above reason two stroke engine cannot compress air and ignite the fuel like diesel engine.
What is meant by intelligent design?
It is the term used by fundamentalist Christian protestants for the religious belief that the creation story in Genesis in the Bible is literal truth. They like to refer to this as a "scientific" theory, but since they can make no verifiable claims about the world from the theory, it is not.
What these people do not realize is that the Bible is an allegory, and its stories teach ways to be a better person. One can have faith and not also believe that the universe was created in a literal 6 days.
Oblique type (or slanted, sloped) is a form of type that slants slightly to the right, used in the same manner as italic type. Unlike italic type, however, it does not use different glyph shapes; it uses the same glyphs as roman type, except distorted.
What is the fastest heat transfer?
It depends on the medium of heat transfer. For solids, it is conduction heat transfer. For liquids and gases, it is convection heat transfer. for vacuum (no medium), it is radiation heat transfer.
Youngs modulus for en 24 steel?
en 24 is an alloy steel in the .40 carbon range. Young's modulus between 28 and 30 million PSI Tim Engleman
What is the Young's modulus of brick?
It is the tensile stregth of brick determined from a flexural test.
What is the air temperature of an air conditioner?
If you are talking about an automobile a/c then they can operate as low as 34 degrees as long as the unit cycles......
