Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Cummulative compound motor.
 Differential compound motor.
 Shunt motor.

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Electrical Machines
Flashing the field of DC generator means

 increasing flux density by adding extra turns of winding.
  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.
  neutralising residual magnetism.

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