Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  air gap.
  cogging.
  relative speed.

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Electrical Machines
In a step down transformer which one of the following statements is true?

  Number of secondary turns is less than primary turns.
 Secondary current is less than primary current.
 Number of secondary turns is more than that of primary.
 Secondary power is less than primary power.

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

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