Electrical Machines
The use of higher flux density in the transformer design

None of these
 has no relation with the weight of transformer
 increases the weigh per KVA
 reduces the weigh per KVA

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

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

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