All Questions
Tagged with structural-engineering electrical-engineering
19
questions
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31
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Will a rectifier based on air gap and flexible foil work?
The white line is a flexible conducting foil suspended on the metal wire. I think the external DC circuit will induce a charge on the flexible part and the other charges move to ground. The charged ...
- 98
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votes
1
answer
421
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Using 2 points to find gradient in log-log plot
https://i.sstatic.net/eiUlK.png
Dear all, the gradient of log log graph of equation highlighted in pink is 2. The question is since the scale is log-log, we can take 2 points highlighted in green as ...
1
vote
1
answer
210
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Why did the metal railings to the stairs in the big ferries used to shock me?
When I was a kid, and even in adult age, I sometimes went on these large (well, to me, at least) cruise ships which had multiple (like ten) levels to roam around in.
You either got there with the ...
32
votes
3
answers
8k
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Why are two wires used in railway overhead equipment?
While watching the train videos, I came across these overhead wires. After searching on the internet, I found that both catenary and contact wires carry the same voltage and are connected by vertical ...
- 463
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1
answer
33
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Is half of depletion region a part of N region or P region?
Is it correct to say that if the P-N junction is in the middle of the depletion region, half of the depletion region is for the P region and the other half is for the N region?
- 1
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3
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69
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Question about how to study for engineering university exams [closed]
What are some of the ways to predict exam questions from class lectures in university final exams? How should one understand the mindset of the professor & find out important maths/questions he ...
1
vote
2
answers
189
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Effectiveness of LiDAR in manhole structures?
I'm an intern at an electrical utility and I've been tasked with doing a proposal/cost analysis to evaluate whether or not starting a pilot with a company specializing in robotic inspections is worth ...
- 113
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votes
1
answer
37
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Use magnetic levitation to lift a carousel capable of turning 9000lbs [closed]
Allow me to describe my current situation. I have a 18 ft (5.486 m) carousel that is assembled using steel beams that are bent into two circles, an outer and an inner. And there are steel spokes ...
- 1
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0
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73
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Large scale nonsymmetric standard and generalized eigenvalue problems in engineering
I apologize if this is not the right forum for my question, but I cannot think of better place to reach a large number of engineers within a short time span.
Question: I am a mathematician working in ...
- 101
1
vote
1
answer
155
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Is using a 4x4 bolted to the face of 2x12 enough?
I am working on a project that has three 2x12’s supporting a load of 12,000 lbs. similar, but not exactly, to how joists support a house.
The 2x12’s are supporting about 6,000 lbs. on each end.
The ...
- 11
4
votes
1
answer
222
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Mechanical/electronic chalkboard cleaning device to replace the conventional duster to clean the chalkboard
The chalk board duster which is used by teachers to wipe the chalkboard seems very agonizing for them. What new mechanical/electronic devices can be devised to replace conventional chalkboard duster ...
- 412
2
votes
4
answers
3k
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When an elevator has two buttons next to it, ^ and v, what do they actually mean?
Both as a kid and as an adult, I've encountered elevators lined up next to each other, or single ones, which have two buttons on each floor (outside of the elevator):
...
- 29
4
votes
2
answers
133
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What are these outdoors "mystery boxes" for in the USA?
While watching random videos shot in the USA (in the present time), I've noticed these little weird outdoors boxes:
What is the purpose of these? They look like they might be related to ventilation ...
- 41
1
vote
2
answers
62
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Electric Arc Furnace Steam Production
How much steam is emitted from an electric arc furnace in a unit of time? I have not been able to find any data on this which is strange considering the amount of water that is used to cool an ...
- 361
2
votes
2
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74
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For a building on a slope, should the grounded earth lightning protection be downhill or uphill from the structure?
Would it be best to place the earth protection (the copper spike) for a building on a slope downhill (A) or uphill (B) from the structure? Assume that lightning is most likely to strike at (C), the ...
