Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

All of these
 armature current
 armature mmf
 armature flux

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will increase but Pe will decrease
 Ph will decrease but Pe will remain same
 Pe will increase but Ph will decrease
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase

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