Electrical Machines
Cogging in induction motor occurs when

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

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

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