Answer / noel

Basically in a historical sense it is because companies
especially westinghouse in the US and AEG in Germany were
the leading companies in producing electrical equipment at
the turn of the 19th century, and it is a complex story.
Many myths exist but it comes down to the use of frequency
to eliminate the flicker effect of lighting and the decision
by the companies to standardise at 60hz in the US and 50hz
in Europe.Before standardization numerous frequencies were
used by various generating companies.However most appliances
now come able with the ability to work between 50 and 60hz.

Answer / sree

high frequency interference with communication lines. i.e., RFI.

in india we have to use 50hz. in case of usa 60 hz, in usa transmission lines are underground.

Answer / guest

DOMESTIC AREA IS USED IN NORMAL CABLE BUT US ARE USED IN
UNDER GROUND CABLE

33kv Rated output avilable in market (any where in india)

0 Answers   C2C,

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Why short ckt does not happen when solenoid coil connected to supply. as its a wire only.

1 Answers   Siemens,

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What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side

0 Answers   CEB,

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long form of CT

3 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

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what are the preventive maintanance actions taken for air circuit breaker? please answer me

0 Answers   MAHINDRA,

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What is accuracy of a measurement?

0 Answers  

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why is the earthing pin on 3 pin top are big and thick

3 Answers   Marriott,

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If the capacity of water Tank is 50000 Liters situated at 20 meters height from ground level,What would be the size of pipe and how much USGPH water will be supplied and what will be the motor or pump rating used for this work?Illustrate by showing formula?

1 Answers  

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What is evaporator & condencer & compressor

0 Answers   Standard Chartered,

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if you short the any 2phase(R,Y,B),why fuse get blown?

5 Answers   Steel Plant,

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what is linear motor?

2 Answers   Lucas TVS, wbsedcl,

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If I have a motor of 1MW with 6.6kv, running at 35% load, how can i save energy without reducing the load ?

2 Answers   Reddy Labs,

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