Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = even number.
 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = 0.

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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

 Rotation can be changed by interchanging supply terminals.
 Direction of rotation cannot be changed.
 None of these.
  Rotation can be changed by reversing main winding terminals.

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