Electrical Machines
Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency then

 The magnetude of current will increase, but power factor will decrease.
 The magnitude will both increase.
 The magnitude of circuit as well as the power factor will decrease.
 The magnitude of current will decrease but the power factor will increase.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

None of these
  neutralize voltage induced in coil due to fluctuation of l
 reduce eddy current losses by providing local short circuits.
 compensate for the decrease in speed due to increase of load.

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