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

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Electrical Machines
The speed of a DC series motor is

 Proportional to the square of the armature current.
 Inversely proportional to the armature current.
 Proportional to the armature current.
 Proportional to field current.

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