CrazyEngineers Forum |
- Electrical and Electronics safety tips and best practices
- Project and Project Name
- Boiler Control Theory (Feed water Control)
- How to get a high GRE quant score - For average math or non-math test takers
- MEP(Mechanical Electrical Plumbing)
- Add a subgroup to each Technical Discusion section for Educational and Refrence links
- Learning to use a digital multimeter
- Hello CEans!
- about gps mechanism
- Do Engineers Go To Parties
- Future First Person Shooter!
- Intelligent Vehicular Monitoring Using Multi-Hop Wireless System
- CrazyEngineers Covered On UTVi
- hi all
- Kung Fu Panda 2 - The Return of Awesomeness
| Electrical and Electronics safety tips and best practices Posted: 24 Dec 2010 01:52 PM PST Hi fellow CEans. I thought I would start a new topic listing Electrical and Electronics safety tips and best practices for all of us CEans to help add to. The point is to keep Safety First and keep it on our minds every day. We are all worth more Alive. :) At my company we start all our shopfloor meetings with a saftey tip from anyone of our coworkers or supervisors. In my opinion I think it helps keep safety in the forefront of everyones mind and to shed light on safety issues others may not have thought of before. I will start off the list myself and I will do my best to update the list in the first post of this topic for easey reading. I would like to also share a 3 pillar ideology that my company rolled out this year as a base for our safety awareness program. They consist of these 3 subjects: I. A culture of zero tolerance-- No injuries are exceptable. Everyone deserves the right to go home in the same condition they arrived in. II. Safety is everyones resposibility-- Do not wait for someone else to bring a safety issue to someones attention. Do not wait to make a comment to someone that they may be doing something unsafe and suggest a safer method. III. Every walk is a safety walk-- When your at your place of work or in a class keep your eyes open for possable safety issues and do something to fix it or make it known. Feel free to bring these ideas to your place of work or into your classroom. :) OK lets get this list started! 1. When working with electricity or testing equipment always where cotton (natural fiber) clothing including sox and underware to protect yourself from arc flash burns wich would melt synthetic clothes to your skin. If you are not whereing cotton clothing be sure to where a full length cotton lab coat. 2. Always where safety glasses. 3. Make sure to remove tools and garbage from your work area when energizeing a piece of equipment. 4. Use the correct tool for the job. 5. When energizeing a piece of equipment rope of the area to help alert others that work or testing is going on and to make it less likely someone will get an accidental shock. 6. Before testing call out loudely that you are "testing" to inform others in the erea that you are energizeing something. 7. When useing variable voltage test equipment make sure to check that it is switched off first and the voltage is turned down to the lowest setting. Make sure to do the same thing when you are finished. 8. Check your test equipment cords and leads for any cuts or cracks in the insulation or loose connections. 9. Ensure that your tools are in good working order. 10. Stay focused when you are working with live electricity it is easy to forget what you are doing and accidentaly touch something that you should not. 11. Do not where metal jewelry like rings and necklaces when working with electricity. 12. When working with electrical test equipment make sure you know the correct voltage that you should be useing and also weather it is AC or DC voltage to prevent damage to to the equipement being tested. OK thats enough for me for now. Lets hear some ideas from our fellow CEans! :) SAFETY IS EVERYONES RESPONSIBILTY. |
| Posted: 24 Dec 2010 12:51 PM PST Hello, for my final year major project, I have made two projects. One is java desktop application similar to "Student Information Management System". And the other one is java web application for an online learning center. Both of them are live projects. My problem here is I am not able to find a suitable name for my projects. One of my college teachers suggested me that i should choose a different and an uncommon name for my projects so that they do not look similar to any xyz project that is easily available with same name on the internet..... How far this approach is correct....?? :confused: And please do suggest me the names for my projects... |
| Boiler Control Theory (Feed water Control) Posted: 24 Dec 2010 10:39 AM PST Boiler Control Theory (Feed water Control) The feed water is controlled to keep the drum level .  Water-level controls continuously monitor the level of water in a steam boiler in order to control the flow of feed water into the boiler and to protect against a low water condition which may expose the heating surfaces with consequent damage. The control may be float operated but modern plant will have conductivity probes. The probes will be fitted in pads or standpipes on the crown of the shell or drum and enclosed in a protection tube which will extend to below the lowest water level. With watertube boilers the control of the water level needs to be precise and sensitive to fluctuating loads due to the high evaporative rates and relatively small steam drums and small water content. (1) One element control One element control using only the drum level is applied during the low load (< 20-25% boiler load). before we talk about the control theory of one element control , we have to show the (SHRINK and SWELLING) phenomena which is happened at boiler drum ,whenever you start firing the boiler:- To illustrate the shrink and swell effect in a steam drum let us consider a sharp increase of steam consumption. With the sudden increase in the steam consumption the steam drum pressure drops immediately. With the sudden drop in the pressure the steam bubbles in the water wall and the drum swell and results in a sharp momentary increase in the drum level. After the pressure stabilizes the drum levels behaves in a conventional manner. This initial increase in the level is called swell and it is unique to the steam drum.  Similarly, when the steam consumption reduces suddenly, the drum pressure rises immediately and the steam bubbles in the water shrink. This leads to a sharp momentary decrease in the drum level. This initial decrease in the steam drum level is called shrink.  In a conventional one-element control strategy the output of a level controller cascades into a flow controller. Consider now the use of a conventional one-element control strategy to control the steam drum level. As the drum level increases the controller reduces the feed water supply. And similarly, if the drum level decreases the controller increases the feed water supply. Let us assume that the steam consumption increases suddenly. Due to the swelling effect the steam drum level will rise initially and then decrease. The controller will initially reduce the feed water supply. This will in effect reduce the water inventory and after the swell effect the water drum level will drum significantly.   This is a disadvantage of one element control system , therefore we use only this system structure at (20 to 25 % load) , and we have to take care of drum level by controlling the start up blow off valves. So, to eliminate such this problem , another control scheme is applied to eliminate the drawbacks of one-element control at higher loads. (2) Three element control Three element control using the followings is applied during the normal operation (> 20-25% boiler load ) - Drum level - Main steam flow - Feed water flow In order to handle the situation, the steam flow rate should also be considered for drum level control. It can be done by adding the steam flow rate as a feed forward signal to the output of the level controller. Hence, the supply of the feed water flow is compensated for changes in the steam flow rate demand. With this strategy as the steam flow rate changes the demand for the feed water flow rate also changes in the right direction and minimizes the effect of shrink and swell on the drum level.  Now, let us assume that the steam consumption increases suddenly. As the steam consumption increases the feed forward signal increases the feed water supply to the steam drum. Due to the swell effect the level controller reduces the feed water supply. The net effect of the three-element level control scheme changes the feed water supply appropriately and reduces the effect of swell on the drum level. Thus, the three-element level control strategy provides a more stable drum level control.  |
| How to get a high GRE quant score - For average math or non-math test takers Posted: 24 Dec 2010 10:34 AM PST I found this awesome post on the net. Breaking it down in small posts for ease of readability. :) Author is by the name: zorillo. Let's give him/her the due credit. There are plenty of test takers out there who have a penchant for mathematics or who have dealt with numbers throughout their academic life. These are the lucky guys who can score high on the GRE quantitative with little or no effort. If you are one of these wiz kids, chances are you won’t need to read this article. But let’s face it; many of us are out of touch with high school mathematics, or simply aren’t the ‘math-types’. If you’re one such hard gainer, you’ll need to put in some extra effort to achieve your goal of scoring well. But obviously, your time and energy limits the amount of extra effort you can put in. So how do you go about maximizing the effectiveness of your preparation? Read on. But this is not really math… You may have already heard that the GRE quantitative section has changed in terms of structure and content. Just compare any paper-based quantitative test from Barron’s with that from the Power-Prep CD and you’ll realize they’re vastly different. While the prior deals with a lot of clumsy numbers, the latter involves very little numbers (the use of alphabet letters like a,b,c, etc. in place of numerical values) and instead stresses heavily on basic math concepts like number theory, statistics (SD, mean, mode, etc.), series problems, etc. The scratch paper is fast becoming redundant and you’ll be surprised to know that even the most pencil-happy test taker needs hardly 2 of the 6 pages they provide you with. Why did ETS introduce this change all of a sudden? It remains a mystery, but I speculate (and this is my personal view only) that the reason they brought about this change is because they realized that tying up test-takers in cumbersome calculations was not the best way to test their analytical ability. They needed to generalize the test a bit and stress more on understanding basic concepts. Ironically, although a majority of the people feel that the test has become more difficult, the percentile score of test takers has remained almost constant. A score of 800 is still 92 percentile. What it means is that the test has not become harder nor easier -the difficulty level is the same. The only switch is from the type of questions asked, and if you prepare with this new trend in mind, you’ll be inching closer to the high score that you’ve always dreamt of. Give yourself time I was shocked to learn recently that there are some people out there who take the test on a month’s preparation because they have ‘other commitments to attend to’. If getting a high score is important to you, you must give yourself a comfortable 2.5-3 months to prepare for the GRE. If not, then don’t harbor any hopes of scoring well and be content with an average score. However, don’t overdo it; 3 months are more than enough. Your mind is an old engine (considering you’re already over 20) that will come spluttering to a stop if you overwork it. Right. As far as math is concerned, make it a point to solve a few exercises on an almost daily basis, even if it’s just for an hour. Regular practice is important because it improves your speed of calculation, and time on the real test is an important factor. If you’re an average math ability person, speed is even more important to you since you’ll spend most of your time working out an approach to the problem rather than doing calculations. Do your math everyday, religiously. |
| MEP(Mechanical Electrical Plumbing) Posted: 24 Dec 2010 10:23 AM PST Hello everybody.... I would like to do a course in MEP (Mechanical Electrical Plumbing).. Please help me out for selecting a good institute in Hyderabad... And If anybody is already doing a job related to this course then please tell me the demand for it in foreign countries. I am a final year mechanical engineering student and wish to do my major project on this and learn the course as well |
| Add a subgroup to each Technical Discusion section for Educational and Refrence links Posted: 24 Dec 2010 08:44 AM PST I have a suggestion for the CE Technical Discusion part of the board. We could have a subgroup for stickied links to online educational and refrence material related to each technical discusion section. This my be a usefull one stop tool for everyone. |
| Learning to use a digital multimeter Posted: 24 Dec 2010 08:04 AM PST Can anyone recomend an online educational source (interactive if possable) to fully learn How, Why and Where to use a Digital Multimeter and all its functions. I have a small amount of experiance with them but mostley by hands on and for checking continuity. |
| Posted: 24 Dec 2010 06:58 AM PST Name: YOUNGGRASSHOPPER *Engineering Trade: I am not an Engineer yet and do not have any education as an Engineer. I work in the power distribution industry so I would say I fall into the Electrical/Electronics area. Aside from on the job training I am attempting to teach myself what I can. I am also considering enrolling in part time classes in this field at a later date and getting advice and encouragement from coworkers who are students as well. At this point time and money are my obsticals. I am getting started a little late in life but am looking foreward to learning more as time goes on. Location: Illinois,usa *Occupation: Manufactureing Technician-Wiring, assembly and testing of Three Phase Motor Control Centers Work Experience: At my presant company I strated out as a contingant/temp worker about 4 years ago. After a few months I was able to get hired on as a full employee. I started out doing mostly mechanical assembly and after about a year moved onto the electrical assembly aspect. Every week/month I continue to learn more about my job and thats what drives me to try to learn even more. Past jobs I have had have given me exposure to construction, mechanics and machineing. *Hobbies & Interests: At this point my new hobby and interest is focusing around learning more about my job and how to do it better. Other things I like to do are listen to music, watch movies with my wife, and playing some online MMO video games. *Aim in life: To better myself. Although I am getting started late in life in my field( I want to learn how to fish and not just be given a fish. ) *I joined CrazyEngineers because: I joined CE because this seems like a very interesting and helpfull concept that is pulling people together from around the world to learn and better themselves and inturn better there own companies and communities. |
| Posted: 24 Dec 2010 06:15 AM PST i had seen in a movie called knight rider in a seen i had noticed that car using gps and map with cars moving and it avoid all the accidents by watching them in map in turnings can it really happens can we make such a new device which moves opposite in the map if we can do why can't we keep it in cars and avoid accidents easily please reply it |
| Posted: 24 Dec 2010 06:13 AM PST Do Engineers Go To Parties? Find out in following video - |
| Posted: 24 Dec 2010 05:43 AM PST A sneak preview of future of gaming! Check it out! |
| Intelligent Vehicular Monitoring Using Multi-Hop Wireless System Posted: 24 Dec 2010 05:31 AM PST ABSTRACT:- |
| CrazyEngineers Covered On UTVi Posted: 24 Dec 2010 04:58 AM PST We were covered on UTVi upon recommendation from on of the famous Indian authors - Rashmi Bansal. The videos is old and also shows old design of CE's front page. If you missed the video, check it out - |
| Posted: 24 Dec 2010 03:32 AM PST :happy: hello everyone, i am mahesh from ECE group. Hyderabad |
| Kung Fu Panda 2 - The Return of Awesomeness Posted: 24 Dec 2010 02:05 AM PST This Movie is releasing in May 2011. I can't wait to watch. Check out the trailer :mrgreen: Pure Awesomeness |
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