 | Recent Questions & Answers | | | How Can I Test High Voltage Doorknob Capacitors? | | By WhiteHorse in Communications & Electronics |
I would like to test 30 or more of these capacitors (HEC HT57 100pf 15KVDC N750) to see if they are as good as new. They are used in a tank circuit of a Colpitts oscillator, 4 in parallel, and I don't trust substituting them one at a time for a good evaluation. The failure modes that I suspect, I g ... more |
| Carrier Chiller Problem | | By Jejo in Mechanical Engineering |
Our plant is using a 60Ton air cooled Carrier Chiller.It is cooling water only by 1C and also trips frequently.It has two compressors.Temperature and pressure readings from the panel is given below. TEMPERATURE READINGS AMBIENT TEMPERATURE-42C CEWT-Cooler entering fluid-17.3C CLWT-Cooler leaving ... more |
| Square Pyramid Stack | | By Mrinny in Mechanical Engineering |
Can somebody please show me calculations for the effective weight on cannonballs at the base of a spherical arrangement of cannonballs. To clarify further... it is a square base pyramid arrangement of cannonballs... What is the weight felt by each cannonball? What pressure is felt by the brass mo ... more |
| Regrind Versus Vrgin Fluoropolymer | | By Gwen.Stouthuysen in Chemical & Material Science |
Due the shortage of fluoropolymers our wire insulation extrusion subcontractor proposes to use regrind in stead of virgin PFA. The regrind supplier claims that the regrind is from one source only and is 100% the same base polymer as the virgin polymer we use. What are the risks we face? Where is ... more |
| Water Conservation | | By Anonymous Poster in Mechanical Engineering |
Hi I have been given the task of water conservation in an ice-cream industry. For cleaning of that parts of machine which can be dis-assembled easily are put on a table and then manually washed through pipes which result in water wastage. Will the installation of nozzles be of any help.? |
| Transient Value in Fault Current? | | By S_Sharma in Electrical Engineering |
As we all know that there is transient value of fault current before it achieves the steady state value and it is due to d.c but i want to know how come this d.c part,Kindly explain? Regards, Saurabh Sharma |
| AC or DC Power Electromagnetic Flow Meter. | | By shashi-mohan.tiwary in Instrumentation |
Which one between 230 VAC or 24 VDC power electromagnetic flow meter is better ?Both type AC or DC powered electromagnetic flow meter is available in market, and both type of power is available at site, then which one to select & why ? |
| Pile Hammer, How Does it Work? | | By hien.nguyenquoc in Civil Engineering |
Anyone throw me a light on how the pile driver will work, I mean the diesel hammer? Is there any space to burn the mixture of fuel and air? It seems to me that there two forces exerted on the pile cap. One is the weight strikes to the pile cap. The second stronger force is from the combustion. I ... more |
| How Do I Ghost a Hard Drive? | | By Matt3477 in Software & Programming |
I have a Linux op sys on a hard drive and I want to copy the entire drive, op sys and all . Should the existing drive fail, I would like to insert the copy drive and continue to work asap. Is software available for this type of total disc copy? Thanks |
| CT Excitation Curve and Accuracy Class | | By benotype in Electrical Engineering |
Please, what is the real importance of CT excitation curve? I am yet to understand it very well. For a CT with accuracy class of 0.3B0.1; what does it mean to say, "the ratio of a 0.3B0.1 metering-class CT is accurate within 0.3 percent? |
| Expertise Needed | | By shughes in Civil Engineering |
I'm a reporter for the Utica Observer-Dispatch in Utica, N.Y., I'm working on a project for the next few weeks examining the state of the area's infrastructure, specifically the area's bridges. If anyone on this site knows anything about bridge inspections, has ever done bridge inspections or would ... more |
| Natural Gas Design Standards | | By mrxphil in Mechanical Engineering |
All: For quite some time we who design natural gas compression and pipeline systems have been using AGA XFO277 as the standard. This is derived from the API RP500 standards and we harmonize both to make sure our designs are compliant. The old AGA XFO277 has been replaced with a new AGA XL1001. Does ... more |
| Alternative Vehicle Choices | | posted in Automotive Technology |
The all-electric Nissan LEAF is gathering good reviews, but hybrids dominate the alternative vehicle market. Given the choice, would you buy an all-electric or hybrid vehicle? What is your reasoning? The preceding article is a "sneak peek" from Automotive Technology, a newsletter from GlobalSpec. T ... more |
| Are Renewables the Answer? | | posted in Chemical Manufacturing |
A recent report released by the United Nations Intergovernmental Panel on Climate Change (IPCC) indicates that as much as 80% of the world's energy supply could come from renewable energy sources by 2050. Although renewable energy sources have been touted as a necessary step in reducing dependence o ... more |
| King Arthur's Truck | | posted in Hemmings Motor News Blog |
Through Hemmings Forums, we heard from the folks at King Arthur Flour in Norwich, Vermont, regarding the calliope truck that was used to promote their flour in New York City and Boston in the late 1920s. Featuring a wooden carving of King Arthur atop his horse and carrying a banner (a later ... more |
| Moisture Problem in R410A Refrigerant | | By Keith Grewar in Mechanical Engineering |
The problem being experienced relates to multi-zone inverter units where the outside (condenser) unit consists of a master unit with two fixed compressors and one inverter controlled compressor plus a slave condenser unit that has one fixed compressor and one inverter controlled compressor. Seven ev ... more |
| Noise in Test Equipment | | By moomoo in Electrical Engineering |
Hi Would appreciate inputs/insights to a problem i am facing right now. We are in a audio line industry, and we have noise meters ands scopes to test out the assembled pwb using on a test fixture. The assembled pwb is connected to a pwb and then we check the waveforms and determine if the noise le ... more |
| Carbon Emissions Continue Unabated | | By Roger Pink in General Discussion |
We continue to fiddle while the world burns... Carbon emissions from energy use hit record level, agency says Carbon emissions from energy use reached a record level last year, up 5% from the previous record in 2008, the International Energy Agency said. The Paris-based agency calle ... more |
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