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

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

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Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise and parasitic torque, but increase starting and pull-out torque.
  noise, parasitic torque, starting torque and pull out torque.
  noise, parasitic and starting torque, but increase pull out torque.
  noise and pullout torque, but increase parasitic and starting torque.

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