Engineering - March 2007

I dont understand the characteristics of a dc motor. Basically i have a rough idea of the typical dc motor specs such as no load speed, stall torque.
For the past few days,ive seen some of the manufacturer states their product in terms of nominal values.
but anyway, i want to ask about these examples :

http://www.boschmotorsandcontrols.co.uk/elektromotoren/produkt/0130063108/index.htm

http://www.boschmotorsandcontrols.co.uk/elektromotoren/produkt/0130302003/index.htm

1)Am i right to assume the nominal values as the optimum value for a dc motor?
2)How about the power source, do i need a battery capacity which is more than the nominal current,or the stall current?
3)If you look at the characteristic curve, and try to find the corresponding power/speed/torque manually and compare it with the ones that have been given on the table,its not the same.the first motor(12V):
from datasheet(nominalvalue):35W,4A,3000rpm,0.11Nm
from graph(manual method):20W,8A,4800rpm,0.11Nm

2007-03-14 05:45:55 · 4 answers · asked by eddy1234 1

2007-03-14 05:40:20 · 2 answers · asked by Anonymous

I need reasonably easy to use software to design a large, circular floating struture, including wiring, plumbing, etc...

Any suggestions on what thype of software to use is appreciated, thanks.

2007-03-14 05:08:03 · 4 answers · asked by twilightinsanity 2

2007-03-14 04:46:21 · 2 answers · asked by Anonymous

2007-03-14 04:45:11 · 1 answers · asked by suhas k 1

what is fusion power plant and how does it work

2007-03-14 04:39:40 · 2 answers · asked by Orlando J 1

s = metres and t = time.
A) differentiate the formula to find the formula for velocity, can anyone show me how??
B What is the velocity after 2.5 seconds?

S= 1+30t-2t^2

2007-03-14 04:07:19 · 9 answers · asked by fanta m 1

2007-03-14 03:59:09 · 2 answers · asked by gb 1

2007-03-14 03:31:09 · 13 answers · asked by Anonymous

Hi, I am a new graduate student in Georgia Tech. However, I have a hard time deciding on the specific area of study for Ph.D .

I am looking for a practical (which increases chances of being hired by big companies) area, but also have to think about future ...

Can anybody advise me on this... the possible areas of computer engineering are as follows,

-Computer Architecture
-Embedded Systems and Software
-Design Tools, Test and Verification
-Computer Networks and Internetworking
-Distributed Systems and Software
-VLSI Design

2007-03-14 02:58:50 · 3 answers · asked by Anonymous

2007-03-14 02:12:23 · 3 answers · asked by hari_job 1

what is the purpose of the water trap in determining the latent heat of vaporization of water? How would its absence have affected the result?

2007-03-14 01:58:52 · 1 answers · asked by kuwee 2

I have 4 car batteries in series used for melting metal. Need to have 3amps of current. I tried a 12vdc dimmer switch, but it melted. Any ideas?

2007-03-14 01:55:43 · 5 answers · asked by boogie 1

On Danfoss compressor "For ferion" made for york chiller; There is note " LR=150 A"; what is that?

2007-03-14 01:53:51 · 3 answers · asked by wael 1

If there is a cheaper way to generate Hydrogen in large quantities. Can it be used for petrol.

2007-03-14 01:36:41 · 6 answers · asked by arunrobs 2

Thomas Edison believed that all future power stations should use direct current, not alternating current. To demonstrate his point, he would electrocute people's pets using AC to show how dangerous it was! He even electrocuted an Elephant! It was his rival, Nicola Tesla, who invented the modern AC generator and advocated alternating current. Why don't we have ConTesla instead of ConEdison?

2007-03-14 00:45:24 · 3 answers · asked by Anonymous

2007-03-14 00:35:45 · 6 answers · asked by Anonymous

Machining could be: milling, lathing, drilling, grinding, etc...
Other processes could be welding, filing, etc...
Thanks in Advance

2007-03-14 00:21:56 · 1 answers · asked by HumanBeing 1

2007-03-13 23:31:28 · 11 answers · asked by Anonymous

Do the first look to see what is avaliable to them technically and work out what else is needed and design that, or start afresh?. For instance, building a bridge such as the one designed by the Norman Foster Group in France.

Thanks.

2007-03-13 23:00:03 · 4 answers · asked by Anonymous

buildings techniques,road,railway,marine ..........etc

2007-03-13 22:41:07 · 4 answers · asked by prasath v 1

this is the year 2007 already. shouldn't we have flying cars by now? shouldn't we have a different source of energy than oil? why haven't we figured out a more efficient way of producing energy than water turbines? why do computers evolve so slowly? i remember when the first 1GB harddrive came out. after they made that, why didn't they start working on the 1TB harddrive instead of going for the 2GB. why are we still using aircraft that was built over 30 years ago? we should have faster, bigger, more efficient aircraft by now. why are we continuing to build our homes out of wood when we've seen that wood homes can't withstand a hurricane. why don't our soldiers have laser guns by now? they should have figured out by now how to make a laser gun.
I can go on and on.

2007-03-13 22:36:40 · 5 answers · asked by brandon 5

doctors or the biomedical engineers who will survive.....as doctors are becoming more dependent on machines for their investigations......and machines are faster than human beings

2007-03-13 22:29:42 · 4 answers · asked by scientist 1

2007-03-13 22:20:55 · 1 answers · asked by Anonymous

2007-03-13 21:51:20 · 2 answers · asked by sunil n 1

Hydrostatic Pressure increases as the depth increase in any body of water. In the sea and ocean it reaches sinister pressures that can crush a Submarine like an Egg in the deep.

Man has always tried to fight this Pressure by building submarines with thick Steel Walls, but never tried to harness it. How can it be harnessed? Is there a basic Thermodynamic Law that does not allow this massive pressure to be harnessed?


Is there an Element or Metal that reacts to High Pressure to produce Electricity, how can this Pressure Gradient with reference to Atmospheric Pressure be used?

After all in an Internal Combustion Engine a explosion creates High Pressure, that Pushes the Piston Up

http://auto.howstuffworks.com/engine1.htm

Can a Hydraulic Machine be used to convert this massive Pressure to Useful Energy?


http://science.howstuffworks.com/hydraulic1.htm

So my question is how this Hydrostatic pressure can be harnessed.

Thank you for you time and thought.

2007-03-13 21:19:27 · 4 answers · asked by _Red_ 1

What are the factors that must be taken into consideration when steel reinforcement are designed for concrete beam?

(this is for reinforced concrete beams in Bending Stress topic)

2007-03-13 21:14:39 · 3 answers · asked by Anonymous

2007-03-13 21:06:43 · 1 answers · asked by Eric Chua Yanshan Maynas 3

2007-03-13 20:59:53 · 4 answers · asked by e r 1

process control idea

2007-03-13 20:55:55 · 2 answers · asked by Anonymous