why ac supply is maximum used?why not DC?

Dear Sir
We wish to know what type of tests to be conducted on working DC Motors 450 KW 1640 amps two 450 KW motor armtures are connected in series 1640 amps 2 x 300 volts, rpm 250/900 and 1500 KW 600 V VF 220 V RPM 200/500 RPM When supply DC changed from MG SET to Drive and PLC System supply for

How do residents repair potholes in urban streets on a non existing to very small budget?

concerning your alignment,the pump feeds are in center of the axe line the grout will be extremly limited!

Like already somewone talled do a cold alignment and when your pump is on working temperature do a check alignment immidiated after you stop the engine.

i don't think you need to be s

Any one please clarify the below

what is HIC, SCC, SSC, SOHIC, SZC, HSC?.

how these cracking are orginating and what are remedies to avoid such cracking?

I was reading something related to surface energy of thermoplastics. And I came across a self made conclusion: Amorphous thermoplastics have high surface energy while Semi-crystalline thermoplastics have low surface energy. I need to know am I right or wrong? and what is the reason behind a plastic

It's so easy to walk into your local auto parts store and grab any ol' headlamp bulb when one burns out, or you just want to upgrade. But before visiting your local AutoZone, Kragen, Napa Auto Parts, Pep Boys, etc., make sure to watch this episode of Motorz.

In Episode 2 of Season

It's too old-school to be a Transformer. But this bizarre hulk has that 1950s sci-fi-comic-book thing going for it. It appears to include the complete front clips of at least three Cold War mobiles. Can anyone identify them

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The MTC-500AFR mobile tank cleaner from Algae-X (AXI) is a three-stage tank cleaning system with an adjustable flow rate motor. The variable speed drive controller is equipped with monitoring LEDs for power and status of the motor. The drive combines a high-starting torque with a soft pump star

Part I of this blog series discussed LED lighting as a viable option for future lighting needs. While the use of LED lights has been primarily for outdoor lighting, there are plenty of reasons why LEDs may be a more attractive option for lighting up homes as well.

Positive Aspects of

Dear All,

I need a power supply which modulates its dc output or i can say through which i can super impose a AC signal with certain magnitude and frequency on Dc output . These features are avilable with Kepco BOP-50-2M but it is costly ,so i need a indian manufacturer with

I am looking for the best certification, that is reconized anywhere my work may take me in the USA. I work for two major wireless companies as a contractor and will be taking on different work area's for them this fall. Thanks for any help in this matter.

jhunter1972

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I did not receive today's Daily Digest, March 8, 2010.

Is there a way to "force" a download, to call it up, so to speak. Thanks.

Good day to all CR4 Members,

I'm no expert on Sewage treatment plant but given a task to conduct preliminary plant sizing. I can easily arrived on the flow rate (m³/day).

Does anyone of you gents have rule of thumb on the plant space? say m²/m³ of sewage? I know that the plant space will b

I want to know which cars use the PM camshafts

From me to CR4, a nice math puzzle for everyone :

Complete the sequence:

5, 8, 12, 18, 24, 30, 36, 42, 52, _____

Bonus Question:

How much wood would a woodchuck chuck if a woodchuck could chuck wood? (Please Make Sure Your Answer is in Units of Cords)

Good Luck!

Hi,

do anybody know that how can I set restraint slope for AREVA MICOM P642 and P643 Differantial Relays? We protect the power transformer. I will be very happy, if anybody can send me a setting file for AREVA MICOM Differential relay.

Thank for your attention.

Best wishes

Hello,

This is not my field, so I'm hoping for a simple solution. I need to find the equations required to calculate the temperature change of dry air (at -40ºC dew point).

Unknown: Air temperature in Vessel 1.

Known: Vessel 1 (air tank at 5 psig); line (1/4" diameter, 120

I have a 1994 Vauxhall Astra which despite being well past the UK government's 'scrap by' date has only done 73,000 miles and is a clean and normally reliable car.

This morning it developed a fault however. Whenever I go much past 30 mph the alternator warning light starts flic