Answer Posted / m.kumaran

Normally the formula for speed is N=120f/P
N=Speed in RPM
f=Frequency
P=No of poles
Example
f=50Hz
P=2
so N=3000 RPM.but we use 4 pole machine we get 1500 RPM
The indian machines are manufactured only 2&4 poles only so
we get 50Hz frequency. but most of indian power generating
stations are follow this technique. but we want to change
this method total methods of generating station will de
changed.

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