Electrical Machines
Armature of DC machine is made of

 insulating material.
 silicon steel.
 conducting material.
 non-ferrous material.

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

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