Power Systems
A Pelton wheel turbine having a rated speed of 300 rpm is connected to an alternator to produce power at 50 Hz. The number of poles required in the alternator is

 8
 10
 4
 20

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Power Systems
Advantages of shunt compensation is/are

 It requires less maintanance
 single unit can be used as both capacitance and inductor by adjusting the excitation
All of these
 smooth voltage regulation is possible by controlling excitation

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