Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

  Shunt.
 Compound (cummolative).
 Series.
 none of these.

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Electrical Machines
Cogging in induction motor occurs when

 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.
 number of stator teeth - number of rotor teeth = even number.

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