why only dc is given as excitation...why not ac???

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why only dc is given as excitation...why not ac???..

the requirement for the excitation is of constant pole
electromagnet not pulsating pole em, as this only can lead
to pulsating emf on armature.

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why only dc is given as excitation...why not ac???..

Answer / manikumar agcet

If excitation is dc then it is
easy to vary output voltage&
powerfactor.

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3 No

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