Electrical Machines
Wave winding is employed in DC machine of

 low current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.
 high current and low voltage rating.

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Electrical Machines
The speed of a DC series motor is

 Inversely proportional to the armature current.
 Proportional to field current.
 Proportional to the square of the armature current.
 Proportional to the armature current.

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