Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Straight line parallel to the speed axis.
 Rectangular hyperbola
 Straight line through the origin.
 Circle about the origin.

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

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