Engineering - January 2007

that about covers it!

2007-01-27 08:38:44 · 3 answers · asked by Anonymous

I am setting up a battery buffered system where no wires will be longer than a couple feet. I can set this up either 12 or 24 volt.
This is a continuiously running system, however the charger will only be in use part of the time.

120v in (batt charger) > 12v or 24v batt bank > inverter > 120v out

Are inverters more efficient at higher input voltages?
This is in Alaska, is higher voltage less susseptible to cold?
Is there benifit to more storage or more volts?

2007-01-27 08:37:35 · 4 answers · asked by the prof 2

2007-01-27 08:00:47 · 18 answers · asked by Commensalism 2

We are thinking about opening up a wall in our home to make a large doorway from one room to another. How can we determine whether the wall is a support wall or not, and how large of an opening it could accomadate? Please be detailed as we will be doing most of the work ourselves.

2007-01-27 07:48:09 · 4 answers · asked by bpb3716 1

2007-01-27 07:23:15 · 10 answers · asked by Anonymous

I am currently working on a generator project. I am using a motor to turn an alternator to produce electricity. I have hooked the pulley on the motor to the pulley on the alternator with a belt. I am fairly sure the alternator is spinning fast enough to produce electricity because the motor is spinning between 1000-3000 rpms. I then have attached the alternator to a 12V car battery (to energize the electromagnet in the alternator).
I am trying to measure the amount of electricity produced by the alternator with a multimeter. I have tried several times to attach the multimeter to the alternator but I keep getting the reading of 12.67V which is the charge of the battery. I cannot figure out how to attach the multimeter to the alternator to get an accurate reading of the electricity produced by the alternator. Diagrams or pictures of how to wire this would be very helpful. Also does anyone know other ways to test voltage of an alternator? Does anyone know of other alternator projects?

2007-01-27 07:13:47 · 4 answers · asked by needanswers 1

what is flow pressure? please hurry. . .i have a huge test this monday!!

2007-01-27 07:03:09 · 3 answers · asked by Anonymous

2007-01-27 06:29:43 · 6 answers · asked by Anonymous

If you wanted a company to buy your "snack shack" design what ares some points you would bring up that make
your car the best.

I am doing a project for Eingenerring and i need to know why the company should declare it the best

its not exactly a car more like a open vihecal that runs on a motor and those gear teeth thingys(dont know the name). But i need to know why the teacher should declare mine the best. any ideas
and which would be better front or back wheeled drive?

2007-01-27 06:20:56 · 2 answers · asked by Thank you 1

maybe someone knows of a free fault current calculator on the web? thanks

2007-01-27 05:54:24 · 4 answers · asked by Dennis 2

2007-01-27 05:17:26 · 8 answers · asked by shskw04 1

common household items

2007-01-27 05:06:56 · 9 answers · asked by Anonymous

2007-01-27 03:45:39 · 12 answers · asked by nanu 1

Okay here it goes....I am having a brain lock right here......I am in school for electronics / computer IT training one of the questions on a hand in - is that I find RT=_____. I have a series parallel combination circut that starts in series with 2 parallel circuts R1 thru R6 they range from 500 ohms to 3.5K ohm resistors across the circut. My IT=10ma. that's all the information I have been given. The formula I surmise is as follows.....R5 + R6 =_____ = 1 OVER = REQ1 1/ + R4 1/ = 1/ = _________ + R2 + R3 = REQ2 1/ + R1 1/ , 1/ = RT.

If someone could tell me if I am getting this right the RT I am getting is 656.03 -6 ohms....... is this possible with these values.... R1 = 3.5 K
R2 = 1.5 K
R3 = 1.2 K
R4 = 1 K
R5 = 500 OHM
R6 = 3.5 K
RT = _______

R1 and R4 are in parallel

Could some one please show me the correct formula? for step 1 of computing this circut.......I am just starting to learn this in IT school and I am having a hard time wrapping my head around this!

2007-01-27 03:45:27 · 5 answers · asked by Boogieman 3

I'M GOING TO TAKE THE TEST IN ABOUT TWO WEEKS DOES ANYBODY HAVE ANY OF THE QUESTIONS???? HELP PLEASE

2007-01-27 03:44:27 · 1 answers · asked by Anonymous

2007-01-27 03:17:25 · 3 answers · asked by sam k 1

tell me the use of bluetooth and its applications in aeronautics in detail .how it is used in aircraft maintainance.help me to answer my madam...

2007-01-27 03:12:51 · 3 answers · asked by kunnu 3

2007-01-27 02:44:42 · 6 answers · asked by mimi 2

plzz

2007-01-27 02:00:13 · 1 answers · asked by jenz 2

2007-01-27 01:46:51 · 2 answers · asked by luvnbluealwayz 1

2007-01-27 01:46:09 · 3 answers · asked by Anonymous

2007-01-27 01:15:12 · 7 answers · asked by Anonymous

can you explain step by step

2007-01-26 23:40:30 · 2 answers · asked by spect_key 1

What material properties are desireable for heat shields,such as those placed on the space shuttle?

2007-01-26 22:59:18 · 2 answers · asked by flying0633 1

what is the significance of structures and machine components made of two materials with different coefficients of thermal expansion?

2007-01-26 22:57:23 · 4 answers · asked by flying0633 1

2007-01-26 22:53:08 · 14 answers · asked by Anonymous

cENTRIFUGAL FANS

2007-01-26 21:02:29 · 1 answers · asked by A.K. R 1

I need to find a way to control the speed of an electric motor over a wide rpm range so that it is what I want it to be, per it's input w/o feedback. This would be a small motor, like an RC car type. I want to write a number to a DAC and either use a Voltage source or a Current source as the controll, but need to be able to lock the speed over a wide rpm range with a lightly varying load, ie: load will vary with rpm, pretty linearly, and be light in comparison with the torque capability of the motor, and needs to work with many motors ie: for production in a product. Any help? thanks,, C. Speed is going to be up near 7000 rpm at the top end, aroud 200 at the bottom.

2007-01-26 20:01:53 · 3 answers · asked by Anonymous

2007-01-26 19:37:15 · 1 answers · asked by santosh v 1

Hi! I'm building a model rocket launch controller and I am confused about something that has been giving me a headache for over a month now.
The device basically completes a circuit when the button is pressed, which heats up the resistance wire in the ignitor which then ignites the engine. My current system is running off of two 9v batteries wired in series and the problem is that when I compare it to the stock system which is just running off of 4 AAs, my system is barely getting the wire to ignite.

What could the problem be? Clearly it's not a matter of the voltage being too low. Do I need more resistance or something? Please help. I'd like to get this worked out so I can use it for my student's rocket launches.

Thanks!

2007-01-26 18:49:13 · 5 answers · asked by nitin00 1