ENGINEERING.com Student Questions
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Student Questionsen-USActiveForums 4.2Copyright 2000-2013 ENGINEERING.comMon, 22 Jun 2015 05:23:37 GMTPump designHello, i have a question about the design of fountain pump. Here's the problem: By estimating the height of the fountain's central (the highest one) and other quantities, determine weather it would be better to have a pump just below the water's surface or at the bottom of the lake. What kind of pump do you recommend? <br /> <br /> Note: It can be considered as a big fountain with highest water jet of about 10 meters. <br /> <br /> Based on the information on this site: http://www.pumpfundamentals.com/tutorial2.htm#ener... <br /> <br /> I think the pump should be placed just below the surface of the water, so there is a big depth of water underneath to provide enough elevation energy. Haven't done the calculation yet, so it's just my assumption. <br /> <br /> Thank you very much in advance.
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John ChihMon, 22 Jun 2015 05:23:37 GMThttp://www.engineering.com/AskForum/aff/32/aft/1976/afv/topic.aspx0CAREER PORTFOLIO PROJECTHello my name is Kyontate Jones , a college student doing a career portfolio on engineering and i was wondering you got the time to answer a few of my questions that i have. thanks!! <br /> <br /> 1. What drew you to this career? <br /> 2. Describe your typical day on the job. <br /> 3.What are the specific duties associated with your position? <br /> 4.How do you obtain your present job? <br /> 5.how would i prepare myself to tenter this field? <br /> 6.Where do you see this field going within the next 5 to 10 years? <br /> 7.What do you like about your job? <br /> 8.What do you like least about your job? <br /> 9.who else would you recommend i speak with who knows about this field?
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Kyontate jonesWed, 13 May 2015 14:24:57 GMThttp://www.engineering.com/AskForum/aff/32/aft/1925/afv/topic.aspx0A study on the structural performance of normal strength, high strength studs and double head studs under pull out loadingHi guys, <br /> I'm a translator, Japanese to English and Korean to English; looking for a simplified explanation of pull out loading and what studs are, in order to provide an accurate translation. <br /> I don't usually deal in technical pieces like this, I usually translate software manuals, media content and maybe a few terms and conditions pages; so when I received this in my inbox, I was a little surprised. <br /> <br /> The title of the paper is in English but the extract I'm supposed to be translating is in Korean. I don't feel I translate accurately without knowing a few things about the terms involved. <br /> It's due tomorrow, only just received it today, really short, 156 words, but I would like an relatively simple explanation of the title <br /> <br /> A study on the structural performance of normal strength, high strength studs and double head studs under pull out loading <br /> <br /> Keywords: Double head studs, High strength studs, Normal strength studs, Pull out loading, sheer stud <br /> <br /> Please, links to diagrams are most welcome, youtube videos, or just an explanation, <br /> anything that might help me accurately understand this topic would be most appreciated. <br /> and <br /> If I'm asking in the wrong place sorry, it seemed like the kind of thing a forum full of engineers might be able to help with! <br /> <br /> Thank you in advance!
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Joanna FreemanTue, 21 Apr 2015 02:07:15 GMThttp://www.engineering.com/AskForum/aff/32/aft/1918/afv/topic.aspx0Finite Difference Numerical Solution for Heat TransferHey there, <br /> <br /> So I'm solving for a hypothetical situation of thermal runaway in Li-ion batteries. The goal is to find the ideal insulating material to ensure that the functional battery does not get above 100 C. Assume that the failing battery is separated from a non-failing battery by a 2 mm thick insulation, and that the battery is 10 mm thick and 200 mm tall. Due to the construction of the battery, the thermal conductivity is anisotropic: 1 W m-1 K-1 and 26 W m-1 K-1 in the x and y directions, respectively. The volumetric heat capacity of the battery is 2.2 kJ L-1 k-1. The failing cell is represented by imposing a 500°C constant surface temperature on the left side of the insulation, and the battery is attached on the top and bottom to cold plates for cooling. The cold plate is represented by a constant surface temperature of 25°C on the top and bottom surfaces of the battery. You are also to assume that the right side of the battery is thermally insulated, and that there is no thermal contact resistance between the insulation and the battery. <br /> <br /> The idealized picture is attached as Figure.png <br /> <br /> I know that this can be approximated with Ansys and a few other softwares, but I need to solve this using numerical methods. <br /> <br /> So far, I have begun doing a nodal analysis to solve it as a 2D finite difference problem. I've found a few basic code formats for this in EES, and would like to be able to build off of them. I am thinking that it may be wise to run a separate simulation for the insulation and the battery, so that I can plug in conductivity values for the insulation without having to run the entire system. <br /> <br /> If you've seen anything like this before and have some input, it would be great. I'll post updates as I move along in the solution.
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TuckerWed, 01 Apr 2015 15:58:01 GMThttp://www.engineering.com/AskForum/aff/32/aft/1898/afv/topic.aspx0Globe water tower center of gravityHow do you calculate the center of gravity for an empty 104' Globe Water Tower with a 24' diameter sphere sitting on a 56' cylinder with a 24' tall truncated cone base?
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P. WardMon, 23 Feb 2015 06:25:40 GMThttp://www.engineering.com/AskForum/aff/32/aft/1831/afv/topic.aspx0Is Environmental Engineering a good career option?I am currently in my freshman year of college and I am majoring in Biology but I am not really sure what I want to do career wise after college. I have been looking at Environmental Engineering. So what do most people who become Environmental Engineers major in? And I would love to hear anything else that you may know about this profession. <br /> http://ukessayreviews.com/
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Alvira JohnTue, 10 Feb 2015 20:26:29 GMThttp://www.engineering.com/AskForum/aff/32/aft/1815/afv/topic.aspx0questionA 4-20 mA signal defines a temperature from 0 to 1000 deg C. On how much bites it has to be converted if we want to see each 0.06 Deg C variation?
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mohammed kweetyTue, 20 Jan 2015 11:02:07 GMThttp://www.engineering.com/AskForum/aff/32/aft/1796/afv/topic.aspx0Network Modelling and OptimizationAn airline would like to cover k flight legs using minimum number of planes. These legs should be combined into consecutive flights to be performed by each aircraft, and their start and end times should be scheduled. The start time for flight i is si and the end time is ei. If flight leg j is to be performed after i, the plane requires rij hours in order to get from the destination of flight i to the <br /> origin of flight j,Start and end times of each flight leg are given and will not be changed. <br /> a) Formulate the problem of finding a schedule as minimum cost flow problem in a network with lower and upper bounds on the arcs. You should clearly state how to construct the network from the given data, and justify that your formulation correctly models the problem. <br /> b) How would the formulation change if a plane is restricted to fly at most D hours? Can the problem still be formulated as a minimum cost flow problem?
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Ece CaliskanSun, 11 Jan 2015 14:14:24 GMThttp://www.engineering.com/AskForum/aff/32/aft/1787/afv/topic.aspx0Engineer InterviewPlease these 7 questions: <br /> <br /> What kind of engineer are you? <br /> <br /> What was the requirement for your job? <br /> <br /> What kind of assignments are you given? <br /> <br /> What is your salary? <br /> <br /> When do you apply math to your work? <br /> <br /> What kind of formulas do you use? <br /> <br /> What would you say was the hardest part about your job? <br /> <br /> Thank you very much in advance for the help <br /> <br />
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Matthew StempSat, 10 Jan 2015 17:19:47 GMThttp://www.engineering.com/AskForum/aff/32/aft/1785/afv/topic.aspx0Estimating the schematic of a black box using the measured impedance curveHello Everybody, <br /> <br /> I need to estimate/predicte the circuit design of a black box using the measured impedance in the output of this box. The only hint that I have that the circuit inside the box is a demodulator, is it possible to estimate the schematic of the black box? is there any smart method to find the connection inside the box? Should I measure other things which make the estimation process easier? <br /> <br /> It is very appreciated if anyone can help me with any information (Tutorial, literature, video, etc...) to solve this problem. <br /> <br /> Thanks! <br /> Merry Christmas and Happy new year. <br /> Regards <br />
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Thomas SofyaWed, 31 Dec 2014 05:19:26 GMThttp://www.engineering.com/AskForum/aff/32/aft/1772/afv/topic.aspx0Making move into EngineeringTo make a long story shorter: I am an Army Officer who was assigned as an Engineer despite having a business degree and logistics experience. Frankly, for the Combat-side of the house, a lack of technical knowledge is not problematic. On the construction and Engineering side of the house, I am feeling the pinch. Frankly, it is not really "needed" but I have found a lack of degree to be a bit of a challenge during certain projects and assignments. The Army is also making a big effort to get degreed Engineers and professionals with other credentials. <br /> <br /> Due to all this, I am feeling very motivated to go ahead and make the move completely into Engineering. To do this, I am going to work on a MS in Civil Engineering since there are no reputable online bachelor's programs that offer an online ABET-accredited degree. I know this will not set me up as well as a BSCE and MSCE would, but I feel it is a step in the right direction. I will also have the ability to earn a MS in Geological Engineering through the Army. <br /> <br /> The good news is that I started off in a hard-science, so I have a lot of the math and science needed. I have found three programs who can work with me on earning a MS in CE. Florida, SMU, and Norwich all have programs which I can pursue. <br /> <br /> Primarily, for the rest of my career, I will be in Operations and Engineering Management and not as much in design or highly technical roles. I may find some DPW or Facilities assignments which will start to border on more technical, but still not something that would require someone to be of the caliber of a PE. Does anyone have an opinion of these schools and their overall reputation? Does anyone have a recommendation on a specific discipline I should choose within CE (Structural, Geotech, Public Works, etc)? I was somewhat surprised to find the variety of options offered at each school. <br /> <br /> My largest concern is that I am building a resume in Engineering, but will probably not be able to fully get to the level that I could pursue PE licensure (unless I really have an inflated idea of the PE licensure and examination in my head). In the Army, this will not be a huge deal, but could be a bit problematic IF I were to have to get out of the Army (injury, downsizing, etc) or when I retire if I need to continue to work for a bit. This brings me to my big questions: <br /> <br /> -Are there really decent job options out there for someone with a semi-technical background, 2 Masters-level Engineering degrees, Operations/Management experience, contracting(actual contracts not just construction contracting), and PM experience (I will take the PMP exam after this deployment)? I am concerned that I will start to build a resume in Engineering and then not be remotely competitive because I will not be a PE and I will be older/experience in other aspects of Engineering. <br /> <br /> -Should I consider trying to pursue the PE? Is it really the monsters that some make it out to be? Is it obtainable for someone who studies only at the Masters level? <br /> <br /> Any other thoughts or advice is extremely welcome as well. <br /> <br /> mark
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Mark OakleyMon, 22 Dec 2014 09:15:52 GMThttp://www.engineering.com/AskForum/aff/32/aft/1763/afv/topic.aspx0please help me, big problemA counterflow double-pipe heat exchanger is currenily used to heat 2.5 kg/s of water from 25°C to 65°C by cooling an oil [cp = 2.2 kj/(kg K)| from 150°C to 95°C. It is desired to 'bleed off' 0.6 kg/s of water at 45°C so that the single exchanger will be replaced by a two-exchanger arrangement which will permit this. The overall heat transfer coefficient is 400 W/(m2 K) for the single exchanger and may be taken as this same value for each of the two smaller exchangers. The same oil flow is used for the two-exchanger arrangement, except that the flow is split between the two exchangers. Determine the areas of each of the smaller exchangers and the oil flow through each. Assume that the water flows in series through the two exchangers with the bleed-off taking place between them. Assume that the two smaller exchangers have the same areas. Take cp,water 4180 J/(kg K). <br /> <br /> please help me in solving this..i have tried my best and i have wasted 4 hours on it..plese any expert help me
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Ijaz AliWed, 03 Dec 2014 10:26:11 GMThttp://www.engineering.com/AskForum/aff/32/aft/1743/afv/topic.aspx0PLTW Principles of Engineering InterviewI am a highschool engineering student in need of an engineer to answer the following questions. Please answer as soon as possible and thanks in advance. <br /> <br /> QUESTIONS: <br /> <br /> a. Interviewee name: <br /> b. Interviewee’s specific degree: <br /> c. Interviewee’s place of employment: <br /> d. Interviewee’s email address and/or phone: <br /> <br /> • Please describe your engineering field. <br /> <br /> • What is your current job title? <br /> <br /> • Please describe your particular job and duties. <br /> <br /> • What is your average work schedule? <br /> <br /> • Starting with high school, describe your educational background chronologically. <br /> <br /> • If you had it to do over, related to your career or education, would you do anything differently? <br /> <br /> • What advice would you give to me as someone interested in pursuing a career path similar to yours? <br />
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Lucas HomcoTue, 02 Sep 2014 05:11:05 GMThttp://www.engineering.com/AskForum/aff/32/aft/1633/afv/topic.aspx1Engineering for over 30Hi, <br /> I could really use some help in choosing a field of engineering to study. I was wondering what would be the best field of engineering to study if you when you graduate you will be 35 yrs old. I am getting started rather late in life and would to choose a field where that won't hamper me very much. Please keep in mind that I am single and will be so for quite a while (although I am not sure if that matters or not). I was originally thinking of chemical or electrical engineering but any advice would be helpful.
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Cory mThu, 20 Nov 2014 15:30:55 GMThttp://www.engineering.com/AskForum/aff/32/aft/1730/afv/topic.aspx2computerengineering is a successful work
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fawas olamideMon, 01 Dec 2014 09:17:44 GMThttp://www.engineering.com/AskForum/aff/32/aft/1740/afv/topic.aspx0Student in need of engineering interviewI'm a high school student in an engineering course who needs to interview an engineer. Can someone fill this out for me please? <br /> <br /> Interviewee name: <br /> Interviewee’s specific degree: <br /> Interviewee’s place of employment: <br /> Interviewee’s email address and/or phone: <br /> <br /> Please describe your engineering field. <br /> <br /> What is your current job title? <br /> <br /> Please describe your particular job and duties. <br /> <br /> What is your average work schedule? <br /> <br /> Starting with high school, describe your educational background chronologically. <br /> <br /> If you had it to do over, related to your career or education, would you do anything differently? <br /> <br /> What advice would you give to me as someone interested in pursuing a career path similar to yours?
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Eric MeiSun, 28 Sep 2014 08:07:37 GMThttp://www.engineering.com/AskForum/aff/32/aft/1668/afv/topic.aspx1Aerodynamics potential flow analysisHi! I have an assignment on potential flow analysis. Could someone please help me with the 1st question I'm really struggling! Here it is: <br /> <br /> Topical Cyclone Hudhud, combined with a North easterly wind (120mph). Assuming the cyclone could be represented by an it rotational vortex, which could be represented by the steam function: ψ=(-K/2π)lnr <br /> And the potential function: φ=(-K/2π)θ <br /> <br /> 1. Derive expressions for the stream and potential functions of the combined flow. <br /> 2. What is the velocity field of the combined flow? <br /> <br /> <br /> ( The lecture told us that we needed to add the stream functions to give <br /> ψ=-urcosθ+Vrsinθ+(-K/2π)lnr ) <br /> Q1 needs to include polar co-ordinates <br /> <br /> Thanks!!! :D
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Hannah JaneThu, 20 Nov 2014 04:31:49 GMThttp://www.engineering.com/AskForum/aff/32/aft/1729/afv/topic.aspx0Major Research ProjectHi Everyone <br /> I'm about to embark on the required research project for the Masters degree. I have a few ideas of what I can do but would like to know if you can perhaps advise me on other possible ideas for a topic. <br /> I'm working in underground mining. <br /> Would prefer to do research that may have potential added value to mining in general. <br /> I know that efficiencies and greater productivity is a hot topic at this stage but not sure what I can do here. <br /> I'll appreciate any comment from those that may have been in a similar situation before. <br /> <br /> Thanks
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Johan van BlerkSat, 15 Nov 2014 16:51:55 GMThttp://www.engineering.com/AskForum/aff/32/aft/1724/afv/topic.aspx0Project for a ClassCan someone answer my interview questions? View All <br /> I was wondering if anyone wanted to be interviewed. It's for a Principles of Engineering class that I am taking, part of PLTW. I'm supposed to just interview a random engineer and thought maybe someone here could help. The answers don't have to be very long. <br /> <br /> Backround information: <br /> <br /> 1. What is your name? <br /> 2. What is your specific degree? <br /> 3. What is your place of employment? <br /> 4. What is your email address and/or phone number? <br /> <br /> Actual interview questions <br /> <br /> 1. Please describe your engineering field. <br /> 2. What is your current job title? <br /> 3. Please describe your particular job and duties. <br /> 4. What is your average work schedule? <br /> 5. Starting with high school, describe your educational background chronologically. <br /> 6. If you had to do it over, related to your career or education, would you do anything differently? <br /> 7. What advice would you give to me as someone interested in pursuing a career path similar to yours?
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John ElliottSat, 18 Oct 2014 17:59:11 GMThttp://www.engineering.com/AskForum/aff/32/aft/1688/afv/topic.aspx1Block Diagram and Transfer functionHi everyone, <br /> <br /> First I need to say that it is not an homework. This is an exercise. <br /> <br /> I need to find 2 transfer function from a block diagram, but I can't find answer b). But I know how to go from b) to c). <br /> <br /> Here is my problem statement (this is a translation from french): <br /> <br /> We want to know position x(t) of mass m with the help of a DC moteur and a gear system. All system elements are shown on picture 2. <br /> <br /> a) With the use of block diagram (first picture I posted) and parameters (in my last picture), find transfer function of every system elements. Consider initial condition to zero. <br /> <br /> b) Simplify the block diagram found in (a) to obtain the transfer function between the power supply of the motor and the speed of rotation of its shaft. <br /> <br /> c) From the transfer functions found in (b), find one that connects the motor electric supply to the displacement of the mass x (t). Determine the order of the system. <br /> <br /> And here is 3 picture to help solve my problem: <br /> <br /> http://s2.postimg.org/y8ve80duh/motor.png <br /> <br /> http://s1.postimg.org/xe4ihw7fz/transferfunction.png <br /> <br /> http://s2.postimg.org/y8ve80duh/motor.png <br /> <br /> Thank you very much. I have an exam monday! <br /> <br /> JP <br /> <br /> <br />
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Jean Philippe GuerinThu, 16 Oct 2014 03:22:28 GMThttp://www.engineering.com/AskForum/aff/32/aft/1687/afv/topic.aspx0