Engineering - July 2007

We are using a bi-color SMD LED blue/red (link below) and the idea is that the LED will always light blue until a switch is thrown then the blue will cease and the LED will illuminate RED. Will a transistor do this? if so which type?

http://www.us.kingbright.com/product.asp?catalog_name=LED&product_id=APHBM2012PBASURKC
http://www.us.kingbright.com/images/catalog/SPEC/APHBM2012PBASURKC.pdf

2007-07-15 07:25:01 · 5 answers · asked by Anonymous

You cook a meal in a 30 cm diameter pot.
The total mass of the pot and the food is 8 kg.
You let the food cool to 20 deg C.
Assuming that the lid is well fitting, no air enters the pot during the cooling period.

when you pull up on the lid, is the lid going to open or is the pot going to get stuck to the lid?

2007-07-15 07:08:15 · 6 answers · asked by Anonymous

just wondering

2007-07-15 06:57:29 · 5 answers · asked by macgyver 1

Can two bolts at both sides be used instead of an axle in a roller drum? The current setup has two ball bearings mounted on a stepped axle on both the sides of the drum. Will the two bolts setup damage the bolts or the drum? Is there a reason why an axle is used instead of bolts? Only reason I can think of is to ease removal of the bearings using the stepped part of the axle. If somebody can provide a explanation with a diagram of pressure points etc that be great. You can email me at khurdp at yahoo.

thank you,
Prasad

2007-07-15 05:44:19 · 3 answers · asked by Prasad K 1

One type is "normal" - same size from bottom to top. The other one is really wide on top. Which is which?

2007-07-15 04:52:33 · 2 answers · asked by vaclav s 2

2007-07-15 04:06:45 · 1 answers · asked by keatkean 2

I am going to appear for FSE interview very soon could anybody please guide what would be questions which are likely to be asked in interview or can anybody share their experiences attending Fire Safety Engineer interview

2007-07-15 04:01:17 · 4 answers · asked by LK 1

2007-07-15 03:39:06 · 8 answers · asked by Borat 2

Okay, I'm doing research for a script I'm writing. In the script, a girl is hooked up to a pair of jumper cables (the other half hooked up to a running car) and electrocuted.

Is this even possible? I'd like to know why or why not please. The more specific the answer, the more likely I'll give it a Best Answer.

2007-07-15 03:24:24 · 11 answers · asked by Anonymous

2007-07-15 02:47:44 · 5 answers · asked by girish kumar 1

2007-07-15 02:32:28 · 5 answers · asked by girish kumar 1

for example, i cast concrete for every 1 hour. does the strength at 2nd hour lower than the first hour?why?

2007-07-15 02:16:50 · 3 answers · asked by iza 2

2007-07-15 01:21:07 · 7 answers · asked by Anonymous

2007-07-15 01:16:50 · 3 answers · asked by martin so 1

The coefficient of friction, tempatature, angle of contact surface, etc are same. total contact area of wheels of engine is much lesser than that of compartments.

2007-07-15 01:16:11 · 6 answers · asked by suniel cv 1

So that I'm planning to measure the distance between the Transmitter-Receiver and bouncing surface...

2007-07-15 01:12:36 · 4 answers · asked by Anonymous

2007-07-14 23:58:53 · 10 answers · asked by turkey_bird_27 1

I am Completed my B.E-E.C.E- 2007 passout. I want to join a reputed company. But i don't know which kind of jobs available and which field i can go? Plz guide me to get a job?
Professionals and unknown face friends plz help me.

2007-07-14 23:05:31 · 2 answers · asked by Anonymous

I got into IIT-Roorkee for Mechanical Engineering.

BITS, Pilani has copied the trend of IIT entrance exams.
Earlier, there was no BITSAT. Now, there is. I don't know, what is it with my dad. He's BITS Alumni. He's not happy.

I hate it. I say BITS sucks a big time and IIT rocks. BITS is there because it's been there since 1929, otherwise it's nothing, I say.....nothing.

2007-07-14 22:27:01 · 2 answers · asked by Anonymous

If I can weld some blades on it would it be practicle? Or should I use something else?

2007-07-14 18:22:35 · 8 answers · asked by sheltz32tt 2

it is an air compressor in my garage-have 240 volt single phase 50 amp service only need 15 amp for the motor.there is only a black and a white wire going to the motor from the cut out switch.I have 2 110 volt feeds and a common-how do I hook them up to the switch?

2007-07-14 16:29:42 · 6 answers · asked by chevyastro 1

Hi,

I want to turn an anti-inflammatory powder into a breathable aerosol for asthma treatment.

Could Ultrasounds achieve this ? Would there be any other method to turn powder into a breathable aerosol ?

Thanks.

2007-07-14 15:51:01 · 2 answers · asked by Chief Justice 1

2007-07-14 15:47:32 · 5 answers · asked by Anonymous

2007-07-14 14:49:17 · 7 answers · asked by lovereds1127 1

2007-07-14 14:48:24 · 4 answers · asked by hello 1

2007-07-14 14:26:11 · 8 answers · asked by STORMY K 3

why is my alternator (PMA) not keeping up with the load and letting my battery run down? I have a 48 volt system and I'm useing a 48 volt permenant magnet alternator unregulated direct to the battery. It takes 51 volts to charge but I'm running it between 53 to 60 volts to get these voltages I'm running at 2700 to 3000 RPM at the PMA, so far so good. According to the power curve chart at that RPM it should produce 75 AMPS. My load is 30 AMPS but it only produces 17 AMPS and I can't figure why. Why is the PMA not meeting the demand and how do i fix it? I have tried other alternators and they have a larger AMP deficit than this one. I need a fundamental reason why its not working. All the batteries,cables,and connectors are new. I've tested the RPMS the volts the AMP load and the AMP output from 4 different alternators. My PMA is producing power but will not meet demand by an average of 17 AMPS. Why?

2007-07-14 11:52:42 · 11 answers · asked by jenric 1

Tell me a material to reflect RF signals. I want to build a sphere of a material. Emit some RF signals. And these signals will bounce back from the sphere and I will read them...

2007-07-14 11:20:58 · 5 answers · asked by Anonymous

We Test our coal and samples keep coming back great, at the coal yard, On the trucks when leaving, and at the Power Plant and then the coal comes back from the plant lab as bad coal... Multi- testing has been done How,, some with answer of seeking help please advise...

2007-07-14 11:14:51 · 2 answers · asked by Anonymous

2007-07-14 11:04:26 · 6 answers · asked by Anonymous