Electrical Machines
Which type motors are preferred for lathes?

 Either A or B.
 Synchronous motor.
 Squirrel Cage induction motor.
 DC shunt motors.

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 A is bigger than B for the same current rating
 B is bigger than A for the same current rating
 A is bigger than B for the same voltage rating
 both are of the same size for the same current rating

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

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

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