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 of current will decrease but the power factor will increase.
 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.

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Electrical Machines
Cogging and crawling are phenomena associated with

 any of the above.
 cage induction machines and they are essentially the same.
 the former during starting and the latter at a fraction of its rated speed.
 the former at a fraction of its rate speed and the latter during starting.

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