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

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

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Electrical Machines
Slip speed is the

  half of the sum of synchronous and rotor speeds.
  sum of synchronous and rotor speeds.
  difference of synchronous speed and actual rotor speed.
  difference of actual rotor speed and synchronous speed.

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