The correct answer is: A. Is always present
Armature reaction is the magnetic field produced by the current flowing through the armature windings of a generator. It is always present, regardless of whether the generator is supplying rated load or not.
Armature reaction can have a significant effect on the performance of a generator. It can cause a decrease in the terminal voltage of the generator, and it can also cause a decrease in the power factor of the generator.
To minimize the effects of armature reaction, generators are often designed with a compensating winding. The compensating winding is placed in the stator of the generator, and it is designed to produce a magnetic field that opposes the armature reaction field. This helps to keep the terminal voltage and
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