Rating Definition and 145 Threads

I need some help in calculating the load rating for a multi-bar hinge. This hinge is different from a door hinge. It is fitted beneath the windows and can be used for either side-opening of the windows or for top-hung windows (windows for high-rise glazed glass buildings). The hinges are...

I think an interesting problem would be trying to deduce how likely you are likely to enjoy a piece of internet content by how well your friends like it. We all have different backgrounds and interest and some things have more mass appeal then others. If you take two friends, you can have widely...

I am in the process of designing a grounding assembly for a high voltage switch and need to determine what contacts will handle 1200amps. The contacts are U-shaped and a flat copper conductor bar rotates into the U-shaped contact to make the connection. Can anyone point me to a reference or give...

Hello all, I am new to the forum and hope my question is appropriate for this section. My question is about per-unit notation and calculations. Basically I've been given the resistance, reactance at the primary and secondary windings of a transformer, core losses and inductance, etc. The...

I want to convert ac 50V, 1.8A into 100V, 1.8A. The voltage is doubling, while the current rating is required to be the same. How can I achieve this? A transformer action step ups the voltage, but does it lowers the current rating? Thanks

Homework Statement The heating resistor is rated at 10ohms and 1W. By how much was its power exceeded? Why didn't the resistor burn up? This is a question taken from an Electrical Equivalent of Heat lab assignment... here is a link to the exact same lab we did...

Minimum wattage rating ?? Homework Statement Hi everyone ,, got the following question a. Find the total resistance, current and unknown voltage drops b. Verify KVL around closed loop c. Find the power dissipated by each resistor and note whether the power delivered is equal to the...

who can explain me the statistical details under the elo rating system? in particular why the expeted value rapresent the score of the game. thanx

i am wondering about how it is possible compute the probability of win, loose or draw in football game or any other sport. who knows the model the bookmaker use? and which level of confidence they have?

Back in the 1970's and 1980's I was told that the NRC wouldn't license a design over 3800 or 4000 MWth. The new designs must be considerably higher (another post mentions the Hitachi at 1700 MWe, seems like that must be approaching 5000 MWth core power). Was I given bad info way back when, or...

i have used different PSU on a simple electromagnetic motor (tattoo machine) and have notice a machine will run a certain way at 2 volts on one power supply but require 9 volts from another power supply to run the same. Question being is it the amp rating of the power supply that does this...

I have neither physics nor engineering backgrounds. I am trying to figure somethings out, and I need some basics cleared up. I will pose my questions as such: 1.) How would you go about rating the strength of steel? 2.) How would you go about testing the strength of steel? For example: is it...

Power supply -- Importance of amp Rating?? Hello all: I have a TV tuner that requires a DC 7.5 volt, 500 ma power supply. I have a 110 V input power supply rated at 7.5 V DC 1,000 ma. Can I safely use this powersupply with the tuner. Analogy: I can plug a 3.5 am vacuum cleaner into a 15...

hi gents, need ur assitant in finding the current carrying capacity of grounding strap (braided cable) if the cable size is one inch or 25 mm, how can I know how much current can it handle? your help is highly appreciated. Regards,

T/F=Transformer usually T/F is used according to the load of the area, street etc. How they estimate that 50 KVA transformer is enough for this load,street? any formula or method please explain ::Thanks

I've just started a research on the tyre of mining trucks and am a bit unsure on how to calculate the TKPH ratings. Say for this set of data from VIMS, GMW = 390 tons Payload = 245.1 tons Total cycle time = 15:29 minutes Total cycle distance = 6.8 km And that is one shift. So, mean tyre...

I have a bk7 prism (borosilicate...) and I'd like to polish it to a 4020 scratch surface rating. How would I go about doing this?

Homework Statement A refrigerator is rated at 370 W. What is the maximum amount of heat it can absorb from the food compartment in 1 minute if the food compartment temperature is 0 deg C and it releases heat into a room at 20 degrees C. Homework Equations COP=Qc/W W=Qh-Qc The...

Can someone please tell me why the heads of the big Wall Street bond rating agencies haven't been charged yet? I don't even know if they're being investigated. We hear a lot about AIG and the banks, but not a lot about outfits like Moody's. I've called news organizations and I don't get good...

http://img26.imageshack.us/img26/3844/fullwave.jpg Just as the title states I am having trouble calculating the minimum Io rating in a Center Tapped Full-Wave Rectifier. I thought it was I AVE x 1.2 but that has not seemed to give me the right answer. I would appreciate any help. (The scan...

I'm looking for a way to get accurate opinions, experiences and recommendations from others in industry on the quality of different electronic suppliers. Specifically, I want to know the quality of the suppliers of MCUs. What are your experiences with Freescale, Renasas, Microchip, Infineon...

When a transformer is rated 225 VA, Vprimary=120 V and Vsecondary=9KV, Isecondary=25 mA, does this mean that on the secondary side the transformer can only supply 25 mA, no more, no less than rated current. Thanks

Hi, Frankly, I'm new to this forum. So please do guide me if I posted wrongly. I need some help in sizing the neutral wire. For a 3 phase 4 wire system (3Ph + N), what is the recommended size of the neutral conductor. Should it be the same as the phase conductor or should it be 50% of the...

Homework Statement A pump is to lift 8.00 kg of water per minute through a height of 3.50 m. What output rating (watts) should the pump motor have? Homework Equations The Attempt at a Solution I have no idea how to even start.

Can anyone tell me what this means in a capacitor spec, other than that I know its associated with leakage current? Is CV for capacitance*voltage, or coulombs*voltage? If its cap*voltage, I will get units in coulombs (coulombs/volt * volt), so what do they imply then to get your leakage...

Hi, here is a couple of questions about superconductors Each superconducting material has a rating for critical field intensity. Now, does the field generated by its own current count? And also what is the current superconducting (type II) material with highest current densities achieved...

Homework Statement Magnetic resonance imaging (MRI) is a medical technique for producing "pictures" of the interior of the body. The patient is placed within a strong magnetic field. One safety concern is what would happen to the positively and negatively charged particles in the body fluids...

Tolerance rating on a 0 Ohm resistor? I'm just curious why the zero ohm "jumper" resistors I use have a tolerance rating of 5%. This doesn't really make sense to me because 5% of 0 Ohms is still 0 Ohms. I understand that even a close to ideal conductor is not going to be 0 Ohms, but why do...

Homework Statement Hello my name is Luke , This may seem random but i need your help as I am a hardcore Horse Racing fan and need to come up with a rating tool to rate horse's so i can sort the average horses from the good ones and I have been coming up with all sorts of calculations...

http://www.ny1.com/ny1/content/index.jsp?stid=1&aid=69586 If smoking scenes will demand an R rating as does violence and sex, then I assume that the person would have to be smoking an entire pack at once, blowing smoke from every orifice in their body, chomping on a bale of chew, and wearing...

Hi, What is the rule of thumb for choosing the voltage rating of a capacitor? Should it be twice the operating voltage or is this overkill? Thanks

I am trying to refurbish a 1.1KW single phase motor (1445 RPM) but both start and run capacitors are missing. How can I calculate what capacitors are required. Motor is Rated 7.2 A (220 VAC) Look forward to your help. Thanks.

This is amazing, why has his approval rating suddenly jumped up? WASHINGTON (Reuters) - President George W. Bush's approval rating has rebounded to 44 percent, the highest level in a year, in the latest USA TODAY/Gallup Poll, the newspaper reported on Tuesday. Bush's approval rating...

i was solving a prob the foll prob on electrical resonance. a resistance is connected in series with an inductor which inturn is connected to 2 capacitors(capacitors are in parallel w.r.t each other, and one of them is trimming capacitor).the circuit is now connected to a relay whose...

I have 2 identical scanners that have 2 different power cords. One of them is 3A/125V and the other is 7A/125V. My question is, does the difference in amps matter that much. Could someone explain this to me in detail?

-------------------------------------------------------------------------------- A pump is to lift 29.0 kg of water per minute through a height of 3.70 m. What output rating (watts) should the pump motor have? An airplane pilot fell 380 m after jumping without his parachute opening. He...

Hey, i got a circuit question, and I'm not sure if i did it right, and was wondering if anyone could show me how to do it A 750W microwave oven is plugged into an outlet and turned on. All three lights are on. What is the maximum power rating of a kettle that could be operated in the other...

Firstly I would like to point out I have absolutely no idea what I am doing and will most likely be blind or dead by tomorrow. But anyway. I've finally finished me first turbo jet engine (from scratch I would like to add and designed myself and dodgy as I am pretty convinced that it won't...

Firstly I would like to point out I have absolutely no idea what I am doing and will most likely be blind or dead by tomorrow. But anyway. I've finally finished me first turbo jet engine :approve: (from scratch I would like to add and designed myself and dodgy as :biggrin: I am pretty...

Some physics books said that the fuse rating is the maximum current that the fuse can carry without melting it. But some said that the fuse rating is indicating the current at which the fuse would immediately melt. Which is true?

One time I voted on a thread, I don't know how I did it, but I did. Is it that only super-mentors and moderators can vote on a thread? And it was a strange techical mistake that one time?

I was checking out a site called www.ratemyprofessors.com to get the low-down on some prospective teachers and I found it very helpful. They have listings for schools in the U.S. and Canada. I looked up the reviews of former teachers and they are pretty accurate. I particularly enjoyed the...

I know this isn't quite what you mean when you say electrical engineering, but, how many amps is a standard three-pronged edison plug rated at? Also, what is common house wiring rated at? I believe that a three-pronged plug is rated at 15 amps and that logically the wiring should be able to...

http://www.cnn.com/2003/ALLPOLITICS/11/10/elec04.poll.bush/index.html And he's got nowhere to go but down:P

Hi everyone! when I first joined this PF version I really liked the idea of rating topics. But I noticed not many have been rated do you guys not see the feature or something? just wondering...