Discussion
Load sharing between two parallel shunt generators is adjusted by
Answer: A
Correct answer: altering their field excitations
Both machines are held at the same terminal voltage by the busbar, so the current each delivers depends on its own generated emf, which is set by its excitation. Increasing the field current of one raises its emf and makes it take a larger share; reducing the other’s completes the transfer. Speed adjustment has an effect only through the emf and is far coarser, and reversing a field connection would simply cause the machine to be driven as a motor.
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