Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  leading power factor.
  higher efficiency.
  more breakdown torque.

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

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Electrical Machines
No load primary current in a transformer

 lags behind applied voltage by exactly 90Â&am
 lags behind applied voltage somewhat less than 90Ã
 leads the applied voltage somewhat less than 90Ã&
 leads the applied voltage by exactly 90Â&

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