Engineering

This from an AP News report prompted me to wonder about the apparent need for an external electricity source in many nuclear plants to run the coolant pumps... So, with these designs, if you lose grid electricity, you go to diesel backup, and if that fails, you better have batteries. What I have never fully understood is why designers, from the start, wouldn't look at this system producing massive steam and think, for safety's sake, we will put in some emergency shunt to a steam turbine that could provide emergency coolant pumping. So the pumps run directly off the plant's heat. As it cools, there is less steam, and there is less need of the steam to run th…

So two tradeoffs came to mind recently... the tradeoffs between subways and elevated rail, and the tradeoffs between solar panels and thermal solar. So I figured I'd put them in the same thread, in case any more come to mind, or in case anyone else has any they'd like to share. So of the downsides I've heard of to elevated rail, the most common I hear of are the noise, and the temperature fluctuations causing rail defects. However, I weigh this against two advantages. One, you see the town outside your window instead of only the tunnel, which, scenery for scenery's sake notwithstanding, has the added benefit of you not having to pay quite as carefu…

The sex simple machines (ref: sextuplets) : 1. Lever 2. Wheel & Axle 3. Inclined plane 4. Pulley 5. Screw 6. Wedge What's the definition of a machine? No restrictions on comments/observations. Feel free to say anything (interesting) you want.

So a common criticism of air travel is that it's hard to sleep during it. One contributing factor to this is the seats. Indeed, people are stuffed like sardines into these planes, it's part of what makes air travel so efficient. But if they had beds in lieu of seats, would it be physically possible to stack them in a manner that crams just as many passengers into just as small an amount of space, while allowing them the convenience of getting to sleep (or at least lie down) for the whole flight? How safely could bunk beds be stacked together while still allowing room for people to get out if they need to use the washroom or something like that?

context taken from here. I am not law student but engineering student but we have to study this in our subject called engineering professional practice and I got confused so asking this here... source-:

Honestly, I can't understand what it is trying to ask me. https://ioesolutions.esign.com.np/notes/text-notes-show/Sector-Contract-Management I am learning engineering professional practice. I am studying this chapter(link above). What is the question trying to ask to me? Can you tell me about that? I have a book about it as well but I can't find what keyword I think I should search..

I'm about to create my first rocket, therefore I would like to know if someone has already made ones. Please, share your experience of creating rocket models here.

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Does anybody here know of the method for engineering problem solving called, TRIZ? TRIZ - Wikipedia

Hi Dear, I have a single-component (Z-Axis) magnetometer with 60nT resolution. I want to calculate the maximum distance that this magnetometer can detect an N52 magnet with a volume of 1 cm³. So I used the following formula and inserted the values, and finally calculated the Z: Br = 1.47 T (for Magnet N52) B= 60 nT (magnetometer resolution) L=W=D=10mm Z=? My answer => Z= 1.579 m Keep in mind that I intended to solve this problem in the simplest possible way; the angle of view of the magnetometer is perpendicular to the magnet plate. My question is whether I have chosen the right formula? or do you suggest another solution for it.

While the efficiency loss due to the reciprocation of the pistons in an typical automobile engine are well known, what if the engine were mounted horizontally, and laid flat with it's pistons arranged to move fore and aft and in alignment to the direction of the vehicle? Would the inertial mass of the pistons/rocker arms moving backwards, and now in alignment with the vehicle motion, cause a slight gain in overall velocity to the vehicle due to simple momentum transfer? While the return piston travel would cancel out any forward velocity gain, would that not essentially remove the reciprocation losses as found in a normally mounted engine, with the piston travels not i…

I think a paying fusion technology is inevitable. In fact, I'm going to argue that it could be happening right now, given the right investment. Even with the the old Joint European Taurus (JET) that first lit up in 1983. The JET holds the current record for Q, the input / output equation, with 24 MW in and 16 MW out, a net deficit of 8 MW. So how could be made to pay? I think you could make that pay by selling the waste heat in a district heating scheme. The 24 MW input will produce about 24 MW of waste heat. The 16 MW output will probably have produced nearly 50 MW waste heat, in the process of generating the electricity. So you're looking at about 75 MW of …

A week ago we had a moderately severe storm in the UK which lefts tens of thousans of properties without electricity. A week on and there are still thousands stranded. Watching the TV pictures of the emergency vehicles, I wondered what would happen if they were all electric ? More precisely how would they be recharged if there was no mains power available ? There are obviously not enough generators available to replace supplies to even the most needy as nursing and care homes went without electricity for nearly a week. What might happen or be needed if we had another really severe storm of the magnitude of the late 1980s and early 1990s ?

So I was wondering how you would make a cross sectional area graph in excel of a craft from Kerbal Space Program. A reference part would be a start I think and then get the height and width. Then the issue is finding the area of an unusual shape like the mk2 fuselage and the wings.

...... Hi. What if we build hundreds of large solar reflectors that can then focus sunlight on a solar sail space craft. How many square miles of sun reflectors would be needed to accelerate a spacecraft at 1 g, on lets say 100 tons to 90% of the speed of light in lets say 3 years ? Regards from jlivingstonsg .....

I guess this is sort of an engineering question. I read in the Washington Post today about how the semiconductor chip shortage will hinder Biden's plans to have 50% of all new vehicles be electric by 2030. As I was reading the section below, something jumped out at me.... Two thousand chips?? I seem to be missing something here. The amount of systems that need control in an IC engine would seem to me to be greater than with the electric car which is, in its mechanical essence, considerably simpler. (this is one reason why electrics are touted as bringing an era of far less vehicle maintenance and longer road life). Basically, you have an electric moto…

Just been comparing the net present cost (NPC) of my previous domestic combined gas and electricity costs. The last quarter - December 2020 to February 2021 Historically a fairly conventional gas boiler and hot water domestic heating. Electric lighting and sundry domestic power requuirements. 2016 Gas boiler replaced by an air source heat pump. Combined gas and electricity costs. Old system NPC cost (ie bills would have been at todays prices) ~ £560 Current system actual costs ~ £660

Two weeks ago, my carry on worked perfectly. But last week the detachable wheels stopped rotating smoothly, when I tried to glide my carry on. The wheels budge JUST A TAD when you push them hard, but it should be EFFORT LESS! Pls see two pictures below. I see nothing jammed in the wheels. I ventilated wheels with my hairdryer. I hosed water into wheels. But nothing fell out. Wheels are still stiff! Why? I bought this carry on for $350 USD. It is out of warranty. I can't afford buy new one.

I'm trying the build a reusable mask with a nose bridge that doesn't break or where-out as fast. I've been looking into using nitinol wire but it has a low fatigue strength. Do anybody have an idea of a metal that has a high fatigue strength. Aluminum might be the best option out there but I feel like there should be something better.

For myself I never understood the relationship of Brown and Blue wires in the BS1363 plug, which Britain adopted from the EU standard. It may cost money, may also infuriate some, but I feel that Red for live, and Black for neutral makes more sense. Would it not make more sense to switch back to those colours, is it not more instinctive ?

Hi. We want to use CAS 63148-62-9 (5 cSt) to lubricate linear motion systems in food processing machines. There will be no direct contact with food. We are trying to reduce the cost of construction. There are a few questions. Will dust and dirt stick to CAS 63148-62-9 ? How does this one behave in relation to different food acids? Can microorganisms grow inside this oil or on the surface (can come from food with active ingredients)?

Hi. Bought this over 20 years ago at a 99 cent store just because was different. Took a short video but became too large and refused to insert here. Well, has a squeezable handle instead of an striker trigger as most. Emits several sparks in about 5mm of squeezing; looks like ----> https://www.amazon.com/Ozeri-OPL1-R-Piezoelectric-Kitchen-Flameless/dp/B01MSKDG51 Is there a major difference in operation principle ? Squeezing instead of striking the crystal ? I presume squeezing bends the piezo crystal.