Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

 The motor will stop.
 The motor will run much faster in the same direction.
 The direction of rotation will reverse.
  The motor will run at its normal speed in the same direction as before.

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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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