Answer Posted / vineeth

In my point of view,it may be due to the construction and
speed of the generator.We know that "f=NP/120".According to
this equation frequency is directly propotional to the
product of speed and the number of poles.For example,
speed,N=1500rpm and number of poles,P=4,then the
frequency,f=50Hz.If the speed,N=1800rpm,then the
frequency,f=60Hz.

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