Engineering

I'm a second year Chemical Engineering student, and I can't seem to find decent exercises to supplement my lectures and tutorials. The tutorials have good questions, but I want more. Can anyone recommend any websites or (preferably) exercise books? I'd like something quite challenging, but obviously within my abilities (basic thermodynamics, heat transfer, etc.). Thanks in advance!

Hi. I have some idea of how they work, but never inspected one closely nor played with one. Question; what do you think would happen if bits and pieces of plastic are fed to it instead of sugar? Would it produce some "plastic wool" ? -Similar to fiberglass ?- (am not joking) Miguel

I'm quite aware of the Second Law of Theromdynamics and have considered "The Hydrogen Economy" a joke, because to get the hydrogen one would either have to break up water (obviously inefficient) to reconsitute it, or break up fossil fuels to create the hydrogen, also degrading the energy. Recently I've been reading that hydrogen engines are potentially so much more efficient than gasoline engines, that the loss in covering gasoline to hydrogen is more than made up by the efficiency of hydrogen engines. This still looks like hype from people who want to push hydrogen, but I don't have all the facts, is there something I'm missing?

I'm just wondering if anyone knows of a website or any formulas they can post that relate to flight, planes, helicopters, and propellors. I have some designs I want to test through mathematics, and once I have the designs down on paper I'll post them here to go through you guys. But to get the idea first and foremost, I'll let you know that I'm trying to make a gas powered turbine on a stiff winged glider for personal use as well as a single prop flying observational camera. You'll understand once I post the drawings. Heh, I already have my head in the clouds, why not get the formulae for them as well. O.o

I am wondering, are there any structural or civil engineers here? If so, what do you guys do for your job? If anyone else knows what exactly they do, and if there are any new 'fields' of discovery, so to speak, in these two areas that you know of, could you tell me about them too? I am interested in becoming either a structural or civil engineer, but I don't know what the difference is.

Im thinking about buying a pair of cheap walkie talkies, they have a range of 3km line of sight, they transmit at 0.5 watt and have 40 UHF chanels. For what i want to use them for requires them to transmit 5km over some small hills and tree's. I was looking in some old electronics books i had and i saw there was a radio booster amplifier circuit. This uses a 9v battery, a NPN transistor and a few other bits to amplifiy radio frequencies (from about 80 - 800mhz) and send them to the receiver. Without buying more expensive transievers or CB radio's, what can i do to increase the range? How much power would i need to reach 5km? what would be more effective, using a…

Electrochemical gas analysers can be used to measure CO, CO2, O2, SO2, NO2,and NO when using a biofuel called Waste Cooking Oil Methyl Ester (WCOME). What other methods can be used to measure the gases emitted by engines using this fuel or any fuel for that matter?

hi guys. new to the forum. im a mechanical engineer by trade, but have been asked by by my nephew now studing engineering a turbofan question and need a little nudge in the right direction His question reads An aircraft powered by turbofan engines cruises at a Mach No. of 0.82, at an altitude where Ta = 223.3K and Pa = 0.265 bar. Each engine has a by-pass ratio of 4.8 and a total mass flow rate of 210 kg/s at these conditions. The fan pressure ratio is 1.75 and the fan efficiency is 97%. The intake efficiency is 94% and the by-pass nozzle efficiency is 100%. Calculate the thrust from one of the engines produced by the by-pass air alone. now i understand that…

I am enjoying so much the threads on hybrid cars and LED lights that I'd like to launch here a thread on building and living efficiencies. I live in southern Oregon, USA, in a temperate climate right "between North and South". Winter nights average just a few degrees over freezing, with every fourth year or so having a cold spell of maybe -10C. Building spec is walls insulated to 6 inches, roofs 9". I built a solar collecting house with south-facing glass of 160 square ft. This is more than is advised because of loss. Figure an R- value of 2 for double-paned (not IR coated), and an R-value of 20 for the walls. Builders are advised to keep window area to 10% of wal…

Here is a practical question. Car engines tend to be grossly overpowered. If you are willing to give up maximum speed and accelleration for fuel economy, what modifications could be made to an internal combustion engine, besides replacing it with a smaller one? Let's assume you want to cut the maximum horsepower down to 60hp or so, and increase the efficiency mostly on the lower end, like in the 10hp range. The intention would be to use the car mostly in town and on back roads, and try not to drive much over 80km/hr, except downhills of course.

Hello science forum To cut right to the chase I am trying to build a device and have no idea where to start. I made this post here as I don’t even know which science sub-forum it would go in. I have tried searching on the internet for both ‘invention’ and ‘modification’ forums as they would likely be more suited to discussing my idea. However ‘invention’ as expected brought up nothing but results for patenting inventions and other tips for personal gain with inventions while ‘modification’ gave me a whole list of resources to do with the subject of video game mods. So here I am…. I will try to keep this as short as possible. Simply put I want to modify a standard…

How Would I Build A Digital Antenna Receiver/Transmitter For My Robot Like I/O Switches. This Might Be A Little Simple But I'm Not Good With Antenna, Receivers, And Transmitters. Thanks,

I have a question for those electic engineers out there. Is it possible to modify a normal anolog AM/FM radio to tune into around 10 - 27 mhz or higher? I think most short wave radio's these days use SSB (single side band) and i know you need special circuits to recieve them. I dont want to get too technical but I have a theory that by modifying the variable capacitor or the coil, i can pick up other frequencies. can someone please tell me if im an idiot for thinking this? also, are most cb radio's/walkie talkies FM or AM?

Hi I'm a high school junior and I've almost selected aerospace engineering as my career. But I still have doubt if it is better compared to other engineering fields! So I just want some suggestions from you people. But I need points which are supported by strong sources!

What can I do if one of the terminal pins on a LED is broken to 0.4cm, and I can't buy another new one? How can I make the terminal pin longer? Because I can twist wire around it anymore- it is too short. Would soldering works in this case? :confused: :confused: :confused:

Hello. At what average speed would a turbine have to continually operate in order to power a household's average daily electricity usage? Is there a formula I could use to figure this out? Thank you. Charles B "Stupid"

I am getting so unbelievably sick and tired of sweating in the spring/summer because my dad won't let me turn the AC on because it "cost to much". In the winter, he runs the heat constantly. Even now in the spring with 65-80 degree weather, he runs the heat every morning for 3 hours. In here (the computer room) it's always like 15 degrees hotter then it is outside and atleast 5 degrees warmer then the rest of the house.

These devices apparently exist as a quick Google search will reveal. However I can find nothing definitive on the matter, and I've racked my brain for search terms. I would like to get my hands on something like this, but I'm drawing blank stares. Has anyone here come across these in their travels?

have an idea or theory to produce clean electricity. My idea starts with a weight with a rope connected to a generator. If the weight is thrown off a cliff it would turn the generator and produce electricity until the weight stopped. This is an example of kinetic energy to create electricity. What if the weight was a submarine like object and instead of a cliff you place it in deep water? The weight would turn the generator as it submerged, then rise to the top and do it again. What if you could connect the weight to a generator as it’s rising? This would generate power as it is going down and as it is rising. Has something similar been done? Can this be done? Can it be d…

Here is the list of manufacturing processes I have developed so far for personal use, can you please give me any advice whether I have missed any, or if it shouldnt be there?: List of manufacturing processes for Plastics: -Compression Moulding -Transfer Moulding -Injection Moulding -Blow Moulding -Calendering -Surface Coating -Extrusion -Casting -Rotational Moulding -Thermoforming List of manufacturing processes for Ceramics: -Extrusion -Forming powders by pressing -Throwing processes -Slip casting -Glazing -Hand blowing of glass -Shell moulding List of manufacturing processes for Metals: -Smith and hammer forging -Drop forging -Impact forg…

Ok, as far as I know from what i've heard, it's theory and can't exist on earth, but... How would something like this work and be implimented? In a sci-fi manga i havn't read yet, it's used for armor, but that's all I know..

Does Anyone Have Any Ideas On Primitive And Practical Robot Intelligence? Something That Can Run On A Network Of PIC 16F84.

can anyone tell me how i can measure the distance from one point to another with something like lasers or whatever (i.e. not by direct surveying)

I'm a H.S. junior in FL. In the past months I really been thinking to myself, What on earth do I want to do? I been amazed by airplanes my whole life and spaceshuttles too. I think engineering them, well that'll be awesome. But here's the problem, I don't even know what aerospace eng. is like? I want to see first hand in a company of some sort what they do and what they're like. And I have another problem, My math. I know Engineering equals math. My math is not the greatest out there, but I am way above average, on my math and science skills. My G.P.A. is 3.3 right now and hopefully that'll change.(My freshman year ) Anyways I was wondering where would I look…

I had an idea just a little while ago about a new type of flying multi-application device that would use a singular propellor and tower assembly. But I wanted to use a singular gyroscope to keep stability and I began to wonder, Could a gyroscope, if turned on an axis, be used to steer a flying device so long as no other forces, except for lift, are acting on it? If so I have idea that I would like to patent.