Answer / k.prakashchandra

You can apply only single or two phase supply to the field
and there will be induced voltage in armature like a
transformer.The dc supply is given to create north and south
magnetic poles in the field.

Answer / Mandira Budiyal

If AC supply is used as excitation voltage for a DC motor, the motor will not run efficiently. The motor may overheat and suffer mechanical damage due to the conversion of AC to DC through internal commutation, which can lead to reduced efficiency and increased power loss.

what is the difference between electrical degree n mechanical degree?

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