Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 shunt field connections.
 armature or field connections.
 series field connections.

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

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