Engineering - May 2007

Please help
an electric shock is felt at the hook:
1. cant get a voltage reading at the hook
2. everywhere on the crane is bonded
3. RCD does not trip
4. the Tower Crane is earthed at the base; all parts are bonded
5. shock is felt even when Tower Crane main supply power is cutted off
6. suspecting that the wire drum is storing the static, but how?

anyone has experience this before and can offer some advice?

2007-05-25 22:05:05 · 3 answers · asked by Anonymous

2007-05-25 21:38:49 · 2 answers · asked by amjad 1

2007-05-25 21:36:13 · 3 answers · asked by marcccopolo 2

Just wondering if i should keep my chem e textbooks or not. Got about 6 months left and i'm graduated. I got about 8 of them right now and can get $20 for each one. Nothing amazing while in the industry i guess....but in terms of bars....$ 160 is great.

I have perry's handbook. I'm gonna keep that...so do i really need all my other textbooks?

2007-05-25 21:16:33 · 4 answers · asked by My name is not bruce 7

2007-05-25 20:11:44 · 3 answers · asked by batu 1

I am looking for this type of colleges in Delhi.

2007-05-25 19:51:12 · 2 answers · asked by bunumallick 1

hunders of my friends said it is not clever to get the PHD before you go to work, they said it is hard for PHD students to get a job opttunite rather than Bachelor (because the starting saraly is higher than Bachelor, and all the big company don't like to hire one who high degree, but no work experience), is it ture? How can I choose? and by the way,, do USA need electrical engineer?
thank u guys.

2007-05-25 17:33:17 · 8 answers · asked by jojojojojojo 1

What it title of the job where a person designs a manufacturing line, with the robots and stuff?

Also, what is the salary?

2007-05-25 17:17:28 · 8 answers · asked by Rube 2

we have an old style fuse-box,and one of the circuits failed,
however the fuse wasn't visibly blown.it still looked the same.

2007-05-25 16:40:31 · 7 answers · asked by herb 1

2007-05-25 16:11:21 · 5 answers · asked by Anonymous

I recently purchased a black pair of leather steel toed boots and work in a mine environment, mostly in an office but with several hours out in the pit near the blast holes where there will be some fine grain sand from drilling.

How can I make these 90 dollar boots last long?

2007-05-25 15:50:18 · 4 answers · asked by Anonymous

2007-05-25 15:48:11 · 7 answers · asked by Badnm26 1

My electric company routinely deliver voltage to me at 124 volts to 126 volts. The voltage requirements for most of my electrical equipment is stated to be 120 volts. It would seem to me that the life of my electronics would be less at the higher voltages. The life of my light bulbs is certainly affected according to reports from light bulb manufacturer. Up to a 50% less life than stated on the bulb package. This then seems to me to be a huge waste of our resources, a much higher cost to me the consumer, and a much higher profit to the electrical companies and to the manufacturers of light bulbs and electronics. Does anyone have any correlation to my thoughts?

2007-05-25 15:36:42 · 7 answers · asked by Anonymous

2007-05-25 14:46:48 · 8 answers · asked by vickiecarol52 1

According to Nicholi Tesla, I heard that if high voltage AC frequency is high enough, it will not electrocute you (even if the voltage is high). How high does this frequency have to be minimum in order for it to not electrocute you (considering your grounded and touch the live wire for a brief moment.)?

2007-05-25 14:24:19 · 5 answers · asked by Anonymous

2007-05-25 13:57:56 · 1 answers · asked by Babette S 1

make it really good.HELPPPPP! first ten answers will be give seven and then if really good u get ten points!?
Who discovered Ohm's law?(give some facts and details)
Who was ampere what were his contributions to understanding current flow?
Who was Voltage named after and what was his contribution to understanding voltage.

2007-05-25 12:17:36 · 3 answers · asked by Dave 2

I think I saw a thing on tv about how they can treat the liquid part of sewer enough to put it in the lakes rivers, etc, but the solids? Where would they go? I know this is a strange question!

2007-05-25 10:26:46 · 6 answers · asked by en tu cabeza 4

That is, by using either scrap or with materials I can find at Home Depot.

2007-05-25 09:21:55 · 5 answers · asked by Pankration 3

I am replacing a battery pack that's past its prime. I know how to cross wire the 1.2 volt batteries to get 6 volts. On any other project I've worked on, say R/C model battery packs, under the plastic wrap is the voltage, amp and or other numberto idenify what type of battery to replace it with.

In that case, it's a simple matter of buying the same type of battery and soldering it together in the proper order. However, these batteries have no writing on them at all. The only way I know the voltage and amps is a label on the plastic covering.

It requires 5 1.2 volt batteries to get to 6 volts, but I'm not sure what amperage each battery should be? How do I figure that?

2007-05-25 06:37:50 · 7 answers · asked by rann_georgia 7

This might be a simple question… but I’m not sure how exactly a wall switch works:

Let say there is a living room with 2 wall switches (switch A and switch B), both controlling the same light fixture. Currently both switches have their handles flipped down. Now I walk to switch A and flip the handle up, and the light fixture comes ON. Then I walk to switch B and flip the handle up, and the light fixture turns OFF. Finally I walk back to switch A and flip the handle back down, and the light comes ON… How is this possible?? I thought a wall switch is always “up is ON and down is OFF” (or vice versa). But according to the above example switch A can be ON when the switch is up / down, depending on what the other switch did previously… So technically the switches only “change state” when flipped to the opposite direction, instead of opening / closing the contact?? … How does this happen mechanically? So the circuit is neither in series or in parallel??

2007-05-25 06:22:05 · 6 answers · asked by man 1

I think the average is around 4 G's.
330 mph in a quarter mile. This is a calculus analysis.

2007-05-25 06:07:00 · 2 answers · asked by Philip W 2

i'm mechatronic student on technical highschool and i need this for my bomb robot project.

2007-05-25 05:32:34 · 4 answers · asked by deimt 1

for a science challenge I am making something which would contain hot metals and wires with wires coming out of it. Does anyone have any suggestions on what material I should use which doesn't get very hot when hot water/metal is inside it, which is easy to get hold of, (easy to make into a certain shape), is easy to cut into an finally looks robotic (ie some type of metal or clear material?) so it looks good not rubbish!
note: i would be willing to cope if a material cound't some some of the above things but it must be able to do the first, second and possibly even the third)
Thanks!

2007-05-25 05:27:22 · 5 answers · asked by Smiling girl 2

I'm thinking about a unit small enough to be in or near your garage. Sort of a "personal hydrogen plant" that would only need to produce enough for one family's use. It might be powered by solar or wind making it cost effective even if the initial investment were fairly high. Anybody seen anything like this being developed?

2007-05-25 05:13:20 · 5 answers · asked by Don 1

2007-05-25 05:10:36 · 5 answers · asked by Anonymous

any suggestion , except using filaments

2007-05-25 03:44:41 · 6 answers · asked by MLD 1

2007-05-25 03:38:59 · 4 answers · asked by lalit n 1

I need the height, length, and width of a regular CD case. I need them to begin designing my final orthographic sketch.

2007-05-25 02:50:46 · 1 answers · asked by Shanice ZR 1

where i can find in the web for free programmes to claculate power flow & short circuit calculations for a power system?

2007-05-24 20:20:38 · 2 answers · asked by ehab_ibraheem 1