Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
All of these
 bending moment due to weight of the armature.
 any unbalanced magnetic pull on the armature core.

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

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Electrical Machines
DC Motor

  dc series motor.
  dc shunt with armature resistance control.
  dc shunt motor with field weakening.
  dc compound motor.

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