Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and excitation
 excitation and load angle
 supply voltage, load angle and excitation
 supply voltage and load angle

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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 magnitude will both increase.
 The magnetude of current will increase, but power factor will decrease.
 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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