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Blog Details for "Conference Room 4 (CR4)"
Conference Room 4 (CR4)Conference Room 4 (CR4)Conference Room 4 (CR4) is a forum for engineers, scientists and technical researchers to discuss engineering news, seek technical help and get answers to burning questions. 
Articles
Coffeepots that Spill
2009-09-22 03:11:00 A while back, several of us got off on a discussion about all the %$%^! cheap coffeepots in the standard coffeemakers that spill coffee down the side instead of pouring into the cup. So, I got interested and started doing some experiments. Her's what I found: When I fill the coffeepot with
Used Test Equipment - What's Hot Right Now?
2009-09-22 02:46:00 What are the hottest used test and measurement equipment in networking and fiber optics right now? I am curious on manufacturer's like Agilent/HP, JDSU, Spirent and others. More About: Equipment , Test
Current on Transformer Primary Side
2009-09-22 00:43:00 I have a question 13.8/0.48 kv 1mva with 5.75 % reactance what will be the fault current at primary side due to fault at secondary side 1 single phase to ground 2 phase to phase 3 three phase top ground kindly help More About: Current , Primary , Side , Transformer
Current on primary side of transformer due to secondary side fault
2009-09-22 00:43:00 I have a question 13.8/0.48 kv 1mva with 5.75 % reactance what will be the fault current at primary side due to fault at secondary side 1 single phase to ground 2 phase to phase 3 three phase top ground kindly help More About: Current , Primary , Side , Fault , Transformer
Pipeline Accessories
2009-09-22 00:40:00 Hi, I´m wondering what´s the meaning of the "P" in pipeline accesories "WPB". I know that W=Weldable, B= it is the grade, but P=? I hope you can help me. Regards, More About: Accessories
MEANING OF "P"
2009-09-22 00:40:00 Hi, I´m wondering what´s the meaning of the "P" in pipeline accesories "WPB". I know that W=Weldable, B= it is the grade, but P=? I hope you can help me. Regards, More About: Meaning
New User Group: Model Engineering
2009-09-21 23:31:00 I would like to suggest a new user group. Model engineering. This includes people who like to build model steam engines, locomotives. There are web sites that cater to amateur machinists and live steam. The U.K. hosts many amateur machinist sites. I think a place on this forum would be nice as hobby More About: Engineering , User , Group
Economics
2009-09-21 23:12:00 The GNP (Gross National Product) represents everything that is manufactured for sale within or outside this country. The products include everything from toys, jewelry, cosmetics, appliances, cars, trucks, machines, food, etc, etc. These products can be divided basically into necessary and luxur More About: Economics
Dowty Hydraulic Pumps
2009-09-21 22:36:00 Can anyone tell me the cc per rev or the gpm of a dowty hydraulic pump with the number OPLO 13 CPDTEN, thanks, Jimmy Northeast UK More About: Pumps
Two-Pole Induction Motor: Effect of Frequency and Voltage
2009-09-21 22:15:00 I have a 2 pole induction motor used for pumping fluid around a system.It is 3 ph and rated at 440v 60 hz it draws 4.2A at full load curent.The motor is wired in star configuration. If i run the motor at 480v at 50hz what would happen to the current ? Increase or decrease and why ? More About: Motor , Effect , Pole , Voltage
Flame Temperature
2009-09-21 22:14:00 What is the flame temperatur of LPG gas at our house. More About: Temperature
Small Transformers
2009-09-21 22:08:00 I know I probably should know this one, but I'll ask anyway. If the primary of a small transformer is connected to power, how much current is running through the primary when the secondary is open? Say you have a 40VA xfmr; at 120 volts, the current would be .33 amps. Is this constant whether the se More About: Transformers , Small
New Batteries and Old Battery Banks
2009-09-21 22:05:00 I have been using solar panels, battery bank and invertor for 100% of my home power since the summaer of 2000. Per manufacturer's rec, I have routinely equalized my battery bank, bringing the bank up to 14.4 volts then discharging back to 12.8, once every 60 days on a pre-programmed cycle, via a co More About: Banks , Batteries , Battery
New User Group: DIY Welding
2009-09-21 22:02:00 Hi, I would like to open an Electric Arc Welding user group here for any one who is interested. There may also be a case for Gas Welding and brazing/soldering as well as another group, I would be interested in seeing that as well. Please comment, for or against and I will weigh up the gene More About: User , Group
CR4 Generates New Ideas
2009-09-21 20:43:00 After reading posts on CR4, new ideas sometimes spring to life. One such example is; the blog on Panasonic LED light bulbs. Instead of replacing light bulbs at $40 a pop, why not rewire the house (lighting only) and use many small LED devices to provide general lighting? A stepdown transformer/recti More About: Ideas , New Ideas
Vertical Clearance
2009-09-21 20:21:00 what is the verticle clearance on national high ways for EHT transmission lines as per IE rule. More About: Clearance
Save on Batteries
2009-09-21 20:09:00 Check this out. Copy the address and paste into your browser to open. You won't believe it. batteries.wmv More About: Batteries , Save
Mercury UPS
2009-09-21 19:51:00 Hi friends i m having a mercury UPS which m using for giving backup to my computer.But after powercut comp. Gets restart.Thus,can anybuddy tell me what is problem? I have charged battery of UPS upto 12hr as given on it. More About: Mercury
Drive Module for AC Servo Motor
2009-09-21 19:23:00 Dear Friends, POWER MODULE which convert the supply AC to DC and then DRIVE MODULE convert the supply DC to AC for run the AC SERVO MOTOR. Please I want to know why we can not use directly VFD drive for AC SERVO MOTOR? More About: Motor , Drive
Planetary Rolling Die
2009-09-21 19:15:00 Why would you use a planetary rolling die over picking a flat die for screw and nail applications? More About: Rolling
Motor Heat Generation Calculation
2009-09-21 19:14:00 Can anyone tell me EITHER how to calculate, OR how much heat is generated from a 440 hp motor?? Thanks harpee More About: Motor , Heat , Generation
Small Water Turbines
2009-09-21 18:56:00 I have a seasonal water falls with thirty eight feet of head. I would like to know why there apparently are no water turbines that are variable speeds. The problem I have is sizing a turbine for a flow that changes. Thanks! More About: Small , Water
The Cadillac With Everything But the Kitchen Sink
2009-09-21 18:33:00 Today, we'd probably call Louie Mattar obsessive-compulsive. With a goal of absolute non-stop driving, he built his 1947 Cadillac into quite the road warrior, including a shower, a complex on-to-go tire-changing system and a combination toilet/washing machine (no, don't ask). Thirty years ago, More About: Kitchen
Which Pump is More Efficient?
2009-09-21 18:26:00 Sir: May I know which Pump out of the following three is the most efficient for Negitive Suction Application for water supply application from a well ? ( suction lift 3.5 mt to 4.5 mt ). We may consider Three Phase 415V , 50 HZ , 15HP Pump for 10 Years LCC having 16 hours working (
VFD / Eddy Current Drive and Automatic Power Factor Correction Relay
2009-09-21 18:14:00 Sir: Pl guide. Current ly I am using 10 Nos. 10.0 HP, 415 V, Three Phase , 50 HZ, S1, F Class , TEFC Induction Motors with Star Delta Starter for Constant Torque Application. Motors are switched on one by one. Will I need APFC Panel if I use Eddy Current Drive ? Will I need AP More About: Power , Automatic , Factor
Harmonic Current
2009-09-21 17:14:00 why 3rd harmonic current always flow in neutral of a star connected windings? why not in other 3 windings if transformer having isolated neutral???? More About: Current
Pear Hooch
2009-09-21 16:02:00 Good day. I have an abundance of pears at my disposal. I like to drink. What is the quick and easy way to make alcohol from this? I will be using plastic 5 gallon pails. How much sugar? How much brewers yeast? What do I do with the pears, sugar and yeast? Thanks guys. Ian.. More About: Pear
Hybrid Internet-TV Makes Progress in Europe
2009-09-21 16:00:00 From NYT > Technology: Internet television has become so popular that some Europe an broadcasters want to put it on TV — the one in the living room. Within several months, viewers in Germany with specially equipped televisions may be able to watch public broadcasters' Inter More About: Hybrid , Progress
Researcher Dies After Studying Plague Bacteria
2009-09-21 15:56:00 From Slashdot: Malcolm J. Casadaban, a molecular genetics professor at the University of Chicago, died last Sunday, seemingly from an infection of a weakened form of Yersinia pestis, the bacteria that causes the plague. "Because this form of the bacteria is not known to cause probl More About: Bacteria , Studying
Stunning Views of Glaciers From Space
More articles from this author:2009-09-21 15:51:00 From Wired Top Stories: To a geologist, glaciers are among the most exciting features on Earth. Though they seem to creep along at impossibly slow speeds, in geologic time glaciers are relatively fast, powerful landscape artists that can carve out valleys and fjords in just a few t More About: Views , Space , Stunning 1, 2, 3, 4, 5, 6, 7 |
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