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Engineering

  • Why should I have to work harder just because the civil engineers in my country have no clue on how to design a lower cost of living?

    4 answers
  • Why isn't there a Tommy gun with a built in silencer?

    Why isn't there a Thompson sub-machine gun with a built in silencer?
    12 answers
  • Weight driven DC motor design help (energy storage)?

    Hi I need help figuring out how to connect a falling weight to my various DC motors and PMA's to charge a battery (with charge controller) I plan on using the excess solar/wind to drive the weight up when it's available, then release the weight to drive a motor and charge my batteries as a backup for when it's cloudy and there's little sun for my solar array system. Most of my motors are geared and have a toothed gear that connects to them how do I arrange things to spin the rotor with a falling weight through the use of a chain sprocket, do I need some sort of pulley system how do I set this up and mount everything?
    5 answers
  • What size AC do I need? How many BTUs will be enough?

    Temperature: I live in Bahrain and temperatures are usually around 40°C or higher, can reach upto 45°C, hardly any winter. Room: Size: 5m×4m×2.93m(ceiling height), second floor, good thermal insulation (newly-built house), fully enclosed room with a very small walk-in closet. Appliances: 4 led ceiling lights, a fan, and two lamps. Windows: 2.2 m long, 3.1 m wide, facing Eastwards, double-glazed windows, with thermal curtains(soon hopefully). Persons living: 2 Thank you very much for the help❤ if more info is needed please ask.
    6 answers
  • How do they construct and build bridges in swamps and marsh?

    I have always wondered how a bridge can survive quicksand, swamps and marshes without sinking.
    7 answers
  • What is harder: being an engineer or programmer?

    Best answer: An engineer, as programming usually does not require the complex MATH.
    9 answers
  • Can we use nikola tesla's technology of sending electricity through the sky to power tesla cars without batteries?

    Best answer: No. Because only small amounts of power can be transmitted this way. And the range is limited. Supporters of Tesla's ideas prefer to overlook these practical constraints.
    4 answers
  • Do colleges have secret tunnels and hidden rooms like hogwarts?

    Best answer: "secret"? no

    However, there may be tunnels where you don't want students (for example, entrance of water mains, sewers, electrical power, shipping and receiving for materials or for the kitchens or...). These would not be shown on public maps of campus.

    They are not "secret" in the sense of being disguised as something else. They would simply be protected by locked doors and signs of "Do Not Enter".

    In the same manner, there may be storage space where you do not want students or general public or even teachers to enter. For example, the refrigerated storage room for the kitchen food. Only some kitchen staff would be allowed in there. Because these spaces would normally NOT be shown on public maps, they might be "secret" to some people.

    In one place, we had a shooting range "hidden" under the swimming pool deck (not under the pool bottom, but next to it). The range was for the use of the local police (not for the students nor the staff). It was not shown on public maps of the building and had no signage indicating how to get there. Either you knew or... you had no business there.
    8 answers
  • How do I limit the output current from a homemade power supply so that it doesn’t flip mains breakers from the outlet?

    Hello, 10 points to best answer. My mains is 15amp and 120volt. I am building an induction heater and need a high powered power supply. I have rectified AC to DC and have an LC circuit for ripple filtering. I have measured 168VDC which should give ~2.5kW power at max without poping a mains breaker granted there is nothing else on the household circuit. The induction machine will draw as many amps as it needs as of right now, so if there is a small bit of metal, the power consumption will be far below 15A. But if I put more metal in, it will draw more amps and pop breakers. How do I limit the current draw or output from either the induction machine or my power supply so that it limits ~2kW of power and doesn’t pop any breakers regardless of the amount of metal I am putting in? If I use a step up transformer to output let’s say 240VDC at a max of ~7.5A, the heater can still draw more current and pop the breaker regardless. I am just trying to make sure I build something that doesnt repeatedly trip breakers every time I try to use it because it is trying to get more power than my outlet can supply. I hope I explained my problem sufficiently. Thank you
    5 answers
  • How do I get rid of crackling static in an audio circuit?

    The 1/8" audio jack on my Alienware 15R4 laptop is sending out static through my external speakers. It's a crackling sound, not a hum. It was fine for a couple months, but not anymore. I tested the speakers with my MP3 player and my cell phone (using the same media files that are on the computer, even an MP3 file that just plays silence) and there was no static then, so I figured it was an issue with the computer, but there was no static when I tried headphones on the computer, so I've concluded that it's an issue with the computer in conjunction with the external speakers. These are the speakers I'm using... https://www.bestbuy.com/site/insignia-po... The static appears when I shut down the computer, when the computer goes into hibernation, and whenever I play any media files. Pausing or stopping the media file makes the static disappear. I tested many media files and two different media players (VLC and WMP) and they all produced the static. Turning up the computer and turning down the speakers helps turn down the static. I tried bumping/flicking the audio jack, cables, and speakers, but that produced no effect. I also tried moving the cables around to see if they were somehow picking up static, but that's definitely not the issue. I've yet to buy another set of speakers to see if they have the same problem.
    8 answers
  • How much do I need to learn to understand KiCad?

    Best answer: KiCad is a PCB (printed circuit board) design program. That is why it seems 2D, because circuits are all 2D shapes piled on each other. It is not a mechanical design program and will not be a mechanical design program. If you want a free mechanical design program, try onshape. Solidworks is a premier package used by many. The key is to learn how to learn a new cad system. If you want to be a mechanical designer don't waste your time with an electrical package that you cannot model an L bracket with.
    4 answers
  • The tester is provided only with partial information about a network?

    4 answers
  • Why do Engineers start preying on women after they graduate ?

    Best answer: Everybody preys on women.
    It's a natural act.
    Especially politicians.
    Liberal politicians!
    7 answers
  • Ummm guys, Im taking Bachelor of Science in Electrical Engineering Give me some points and some advice to survive.Im in the sketchy moment?

    6 answers
  • Why won't the voltage build up after capacitor C3 in self excited induction generator?

    5 answers
  • Do we use transoceanic fiber optic cables under the atlantic and pacific to communicate overseas?

    6 answers
  • Do ordinary muggle colleges have secret passageways and hidden rooms like hogwarts?

    Best answer: Muggle?
    Hogwarts?
    Juggle?

    I have been to many places in which the buildings were connected together by underground hallways that were not accessible from the ground level (called "first floor" in the USA) hallways that were normally used by the public.

    Harry Potter is fiction/fantasy.
    6 answers
  • Whats the total resistance of this circuit?

    Best answer: series/parallel rules don't work here.

    you have to convert the right 3 Rs (or the left 3) using a Delta-Wye transformation
    then you can use series/parallel rules

    in this case (see formula below)
    Rb = 20, Ra = 3, Rc = 6
    R₁ = (RbRc) / (Ra+Rb+Rc)
    R₁ = (120) / (29) = 4.14 Ω
    R₂ = (RaRc) / (Ra+Rb+Rc)
    R₂ = (18) / (29) = 0.62 Ω
    R₃ = (RaRb) / (Ra+Rb+Rc)
    R₃ = (60) / (29) = 2.07 Ω

    now we have 12.07 in parallel with 14.14, which is 6.51
    in series with 0.62 that is 7.13 Ω for total R




    Delta-Wye transformations
    Delta to Wye
    R₁ = (RbRc) / (Ra+Rb+Rc)
    R₂ = (RaRc) / (Ra+Rb+Rc)
    R₃ = (RaRb) / (Ra+Rb+Rc)

    Wye to Delta
    Ra = (R₁R₂+R₂R₃+R₁R₃)/R₁
    Rb = (R₁R₂+R₂R₃+R₁R₃)/R₂
    Rc = (R₁R₂+R₂R₃+R₁R₃)/R₃
    4 answers
  • If I add more more intake fans to my DIY home A/C unit without changing the exhaust diameter, will it blow out harder?

    6 answers
  • Can I use a large flame jet lighter to weld aluminium with welding rods?

    Best answer: No. The temperature of the flame from a lighter is nowhere near hot enough to weld aluminium.
    9 answers