SSC JE Electrical Engineering 2012 Paper

Question : 149 of 200

Marks: +1, -0

Alternator used in hydel power station has more number of poles in it than that used in thermal power station, because

Speed of the prime mover may be changed whenever required.
Power generated by the alternator may be changed according to demand.
Speed of its prime mover is less.
Power generated by this alternator is less.

Solution:

In hydrolic turbine in the hydroelectric plants operatos at low speed, hence the speed of prime mover is low (as compared to steam in case of thermal plants.) according to the relation, we have

f = (P × N)/120

p = no. of poles
F = frequency
N = speed

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