Thursday, March 8, 2012

Stories for 2012-03-07


 Recent Questions & Answers 
Fans, Chamber Size & Static Pressure--Co-relationship/How to Control?
By mazhur in Mechanical Engineering

Once I had a peculiar problem erecting a blast freezer but could find no satisfactory explanation to the problem other than that it was due to built up of static pressure so much so that I had to redesign it to work. It was a masonry-built insulated chamber with single entrance, approx size 8 ft by ...more

Snake Problem
By Anonymous Poster in General Discussion

i have a camp along a small river in pennsyvania. it' in an unhabited area where snakes and other critters are abundant. the wife won't go because of the snake problem, which may be a good thing, but i'ld is like to keep them down to a reasonable limit because of the dog. they're mostly water snake ...more

Industrial Computer Problem
By ahmadarshad in Instrumentation

Dear Sir, I am using QT-2106 industrial PC on our machine. now this PC has faulted. I opened its cover & checked, when we start PC just run processor cooling fan for 1 second & stop. following component status as follows. 1- Power supply fan off. 2- No voltage on all available connectors. ... more

Scale Model, Scale Force?
By Del the cat in General Discussion

I've just made a 1/2 scale longbow (all linear dimensions 1/2 size) How would you expect the draw weight to scale down? I expected it to be about 1/8th using my sophisticated wet paw in the air technique. Just something for discussion really, join in if you are interested. Del

Converter
By fifahaywire in Electrical Engineering

Hi..i'm working with a converter and my output at the 150Ω load is as follow with a duty cycle of about 11% the circuit is is this the correct output? and what else do i need to do if this is not the correct one? thanks. p/s: im sorry bc i had previously posted the same question but th ... more

Regarding CT Meter Reading
By malpanikamlesh in Electrical Engineering

Dear Sir, I am facing a problem regarding how to read CT Meter Reading. Following are the details of Meter : 3x100/5 Amps, 3 x 240 V, 50 Hz, 20 Revolution per KWH having CT of 3x200/5 with a reading of 300. What is the actual consumption reading. I will highly obliged if you give me the answer of ... more

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A Car Show That Fits In Your Pocket
posted in Hemmings Motor News Blog

The world of premium 1/43rd-scale model cars is simply delightful. The variety of American and foreign prototypes, detail, and exclusivity at a really big showing can boggle the mind. The unfortunate thing is that these shows are much less common in the United States than in Europe, but they ... more

Secondary Organic Aerosols Sold Short
posted in E&E Exchange

For over twenty years it has been known that fine atmospheric particles, most of which are secondary air pollutants, are the most lethal of dispersed air pollutants in the U.S. They have links to both heart and lung disease, and are blamed for the deaths of around 50,000 Americans each year. If ... more

Is Brazing Welding????
posted in GEA's Global HVAC Technology Blog

As one of the newer GEA Associates I'm going to share some of the knowledge and experience I gained in my 38 years with Trane. We won't be limited to just North America since Trane has factories around the world making a broad range of products, using many different types of joining processes an ... more

The (Real) Electric Soccer Ball.
posted in Sports, Fitness, and Nutrition

Soccer, football, association football, fútbol. Considering the same game is played by over 250 million people in 200 countries, it's truly a case of "a rose by any other name." International soccer culminates at the World Cup, held every four years and most recently in 2010, hosted by S ... more

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Centrifugal Pump
By Dilip Dombivalikar in Mechanical Engineering

Is manually operated centrifugal pump available ? I am looking for domestic purpose ,to pump about 500 liters of water to 8 meters head.How about use of bicycle axal coupled with pump through suitable gear aarrangement ?

Technical Breakthrough in Telecommunication!
By bett4haze in New Technologies & Research

March 2012 Last updated at 03:20 ET 'Twisted' waves could boost capacity of wi-fi and TV By Jason Palmer Science and technology reporter, BBC News In a public event in 2011, Venice's Palazzo Ducale lit up with "signal received" when the test worked A striking demonstration of a means to boost th ...more

Industrial Refrigeration---Forced Air Cooling Units
By mazhur in General Discussion

In an ammonia run refrigerating plant for subzero Fahrenheit cold stores what should be the length and diameter of a finned steel tubing required to build a forced air evaporator to comfortably cool down a cold room 50 feet by 50 feet and 15 feet high from 22 deg C to minus 20 C in the shortest poss ... more

Lightening Surge
By sunday matembo in Electrical Engineering

I want to install Lightening surge in 132KV SUBSTATION but i don't know what to do especially under ground .Could someone suggest what to do especially on ground ????sketch also (layout diagram for installation) will be highly appreciated.

Switching of Motor Brake, AC Side or DC Side???
By Signode in Electrical Engineering

Dear Frieinds. This is a general question that in one of our machines, there is a brake motor which brake is 200VDC and powered through a bridge rectifier which input is 230VAC (separate) and motor is for rated 380VAC. I want to get some advice that in such conditions, where should we place/connect ...more

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